MAR-10330097-1.v1: DearCry Ransomware

This report is provided "as is" for informational purposes only. The Department of Homeland Security (DHS) does not provide any warranties of any kind regarding any information contained herein. The DHS does not endorse any commercial product or service referenced in this bulletin or otherwise.

This document is marked TLP:WHITE--Disclosure is not limited. Sources may use TLP:WHITE when information carries minimal or no foreseeable risk of misuse, in accordance with applicable rules and procedures for public release. Subject to standard copyright rules, TLP:WHITE information may be distributed without restriction. For more information on the Traffic Light Protocol (TLP), see http://www.us-cert.gov/tlp.

Description

Six files were submitted for analysis. The files were identified as DearCry ransomware. The malware encrypts files on a device and demands ransom in exchange for decryption.

For a downloadable copy of IOCs, see: MAR-10330097-1.v1.stix.

Emails (2)

konedieyp[@]airmail.cc

uenwonken[@]memail.com

Submitted Files (6)

027119161d11ba87acc908a1d284b93a6bcafccc012e52ce390ecb9cd745bf27 (027119161d11ba87acc908a1d284b9...)

10bce0ff6597f347c3cca8363b7c81a8bff52d2ff81245cd1e66a6e11aeb25da (10bce0ff6597f347c3cca8363b7c81...)

2b9838da7edb0decd32b086e47a31e8f5733b5981ad8247a2f9508e232589bff (2b9838da7edb0decd32b086e47a31e...)

e044d9f2d0f1260c3f4a543a1e67f33fcac265be114a1b135fd575b860d2b8c6 (e044d9f2d0f1260c3f4a543a1e67f3...)

fdec933ca1dd1387d970eeea32ce5d1f87940dfb6a403ab5fc149813726cbd65 (fdec933ca1dd1387d970eeea32ce5d...)

feb3e6d30ba573ba23f3bd1291ca173b7879706d1fe039c34d53a4fdcdf33ede (feb3e6d30ba573ba23f3bd1291ca17...)

2b9838da7edb0decd32b086e47a31e8f5733b5981ad8247a2f9508e232589bff

Tags

downloaderloaderransomwaretrojan

Details

Antivirus

YARA Rules

• rule CISA_10330097_01 : trojan downloader ransomware DEARCRY
  
  {
  
     meta:
  
         Author = "CISA Code & Media Analysis"
  
         Incident = "10330097"
  
         Date = "2021-03-31"
  
         Last_Modified = "20210331_1630"
  
         Actor = "n/a"
  
         Category = "Trojan Downloader Ransomware"
  
         Family = "DEARCRY"
  
         Description = "Detects DearCry Ransomware"
  
         MD5_1 = "0e55ead3b8fd305d9a54f78c7b56741a"
  
         SHA256_1 = "2b9838da7edb0decd32b086e47a31e8f5733b5981ad8247a2f9508e232589bff"
  
         MD5_2 = "cdda3913408c4c46a6c575421485fa5b"
  
         SHA256_2 = "e044d9f2d0f1260c3f4a543a1e67f33fcac265be114a1b135fd575b860d2b8c6"
  
         MD5_3 = "c6eeb14485d93f4e30fb79f3a57518fc"
  
         SHA256_3 = "feb3e6d30ba573ba23f3bd1291ca173b7879706d1fe039c34d53a4fdcdf33ede"
  
     strings:
  
         $s0 = { 8B 85 04 EA FF FF 50 8B 8D 08 EA FF FF 51 8B 55 14 52 8B 45 10 50 8D 8D 68 F0 FF FF 51 8B 95 00 EA FF FF 52 }
  
         $s1 = { 43 72 79 70 74 6F 50 72 6F 2D 58 63 68 42 }
  
         $s2 = "-----BEGIN RSA PUBLIC KEY-----"
  
         $s3 = ".CRYPT"
  
     condition:
  
         all of them
  
  }

ssdeep Matches

PE Metadata

PE Sections

Packers/Compilers/Cryptors

Relationships

Description

This file is a 32-bit Windows executable application. This file has been identified as a variant of the DearCry Ransomware. The ransomware attempts to encrypt specific files, identified by file extension, on the target system utilizing the Advanced Encryption Standard (AES) and Rivest–Shamir–Adleman (RSA) encryption algorithms. The ransomware contains the following hard coded public RSA key, which is utilized to encrypt the target system's user files.



--Begin RSA public key--

MIIBCAKCAQEAyLBClz9hsFGRf9fk3z0zmY2rz2J1qqGfV48DSjPV4lcwnhCi4/5+C6UsAhkdI4/5HwbfZBAiMySXNB3DxVB2hOrjDjIeVAkFjQgZ19B+KQFWkSo1ubeVdHjwdv74evEur9Lv9HM+89iZdzEpVPO+AjOTtsQgFNtmVecC2vmw9m60dgyR1CJQSg6Moblo2NVF50AK3cIG2lVh82ebgedXsbVJpjVMc03aTPWV4sNWjTO3o+aX6Z+VGVLjuvcpfLDZb3tYppkqZzAHfrCt7lV0qO47FV8sFCltuoNiNGKiP084KI7b3XEJepbSJB3UW4o4C4zHFrqmdyOoUlnqcQIBAw==-

--End RSA public key--



During runtime, the ransomware loads the hard-coded RSA public key. It then attempts to identify all drives that are connected to the attached system, from Drive A: to Drive Z:. For each drive identified, the ransomware will enumerate it and encrypt files with the following file extensions:



--Begin targeted file extensions--

.TIF .TIFF .PDF .XLS .XLSX .XLTM .PS .PPS .PPT .PPTX .DOC .DOCX .LOG .MSG .RTF .TEX .TXT .CAD .WPS .EML .INI .CSS .HTM .HTML .XHTML .JS .JSP .PHP .KEYCHAIN .PEM .SQL .APK .APP .BAT .CGI .ASPX .CER .CFM .C .CPP .GO .CONFIG .PL .PY .DWG .XML .JPG .BMP .PNG .EXE .DLL .CAD .AVI .H.CSV .DAT .ISO .PST .PGD .7Z .RAR .ZIP .ZIPX .TAR .PDB .BIN .DB .MDB .MDF .BAK .LOG .EDB .STM .DBF .ORA .GPG .EDB .MFS

--End targeted file extensions--



It will then write the ransom note "readme.txt" to every folder it enumerates on the connected drive.



--Begin ransom note--

Your file has been encrypted!

                        If you want to decrypt, please contact us.

                        konedieyp[@]airmail.cc or uenwonken[@]memail.com

                        And please send me the following hash!

                        638428e5021d4ae247b21acf9c0bf6f6

--End ransom note--



Next, the ransomware will attempt to encrypt files on the target system that have the file extensions listed above. After encrypting the target system's user files the ransomware will drop the ransom note "readme.txt" within folders with encrypted files on the target system.



The ransomware will then delete the original copy of the files and then replace them with encrypted copies of themselves with the file extension changed to .CRYPT. Before actually deleting the original target file, the malware will overwrite it with the repeating value 0x41 in order to make recovery of the file using computer forensics software impossible.



Before encrypting the target system's user files the malware will encrypt information about the files, including the file's full path and the AES key used to encrypt it, which will also be used to decrypt it. This data will be encrypted using the hard coded Public RSA key mentioned above, and added to the top of the encrypted file. Note: The ransomware will generate a new AES key for every file.



During execution, the ransomware runs a service named “msupdate." After the encryption process and installing the ransom note, the “msupdate" service is removed, which could indicate that the ransomware was executed under the Windows "msupdate" service.



Illustrated below are strings of interest extracted from this binary. These strings indicate the encryption process of the target system's user files is implemented utilizing the OPENSSL library:



--Begin strings of interest--

crypto\evp\e_aes.c

crypto\bio\bio_lib.c

crypto\rsa\rsa_lib.c

crypto\evp\evp_enc.c

assertion failed: bl <= (int)sizeof(ctx->buf)

assertion failed: b <= sizeof ctx->buf

assertion failed: b <= sizeof ctx->final

assertion failed: EVP_CIPHER_CTX_iv_length(ctx) <= (int)sizeof(ctx->iv)

assertion failed: ctx->cipher->block_size == 1 || ctx->cipher->block_size == 8 || ctx->cipher->block_size == 16

%lu:%s:%s:%d:%s

secure memory buffer

memory buffer

crypto\bio\bss_mem.c

CERTIFICATE REQUEST

NEW CERTIFICATE REQUEST

PKCS7

CERTIFICATE

RSA PUBLIC KEY

DH PARAMETERS

X9.42 DH PARAMETERS

crypto\rsa\rsa_crpt.c

crypto\evp\evp_lib.c

assertion failed: l <= sizeof(c->iv)

assertion failed: j <= sizeof(c->iv)

init fail

called a function that was disabled at compile-time

internal error

passed a null parameter

called a function you should not call

malloc failure

fatal

missing asn1 eos

nested asn1 error

ECDSA lib

ENGINE lib

X509V3 lib

PKCS7 lib

BIO lib

EC lib

ASN1 lib

X509 lib

DSA lib

PEM lib

OBJ lib

BUF lib

EVP lib

DH lib

RSA lib

BN lib

system lib

gethostbyname

getsockname

getsockopt

setsockopt

getnameinfo

getaddrinfo

fread

opendir

WSAstartup

accept

listen

bind

ioctlsocket

socket

getservbyname

connect

fopen

KDF routines

ASYNC routines

CT routines

HMAC routines

CMS routines

FIPS routines

OCSP routines

engine routines

time stamp routines

DSO support routines

random number generator

PKCS12 routines

X509 V3 routines

PKCS7 routines

BIO routines

SSL routines

ECDH routines

ECDSA routines

elliptic curve routines

common libcrypto routines

configuration file routines

asn1 encoding routines

x509 certificate routines

dsa routines

PEM routines

object identifier routines

memory buffer routines

digital envelope routines

Diffie-Hellman routines

rsa routines

bignum routines

system library

unknown library

unknown

crypto\err\err.c

error:%08lX:%s:%s:%s

reason(%lu)

func(%lu)

lib(%lu)

crypto\modes\ocb128.c

crypto\threads_win.c

crypto\ex_data.c

OpenSSL PKCS#1 RSA (from Eric Young)

crypto\rsa\rsa_ossl.c

crypto\engine\eng_init.c

crypto\bn\bn_blind.c

crypto\bn\bn_lib.c

%I64i

OPENSSL_ia32cap

Service-0x

_OPENSSL_isservice

OpenSSL: FATAL

OpenSSL

no stack?

%s:%d: OpenSSL internal error: %s

crypto\engine\tb_cipher.c

?assertion failed: *sbuffer != NULL

assertion failed: *currlen <= *maxlen

assertion failed: *sbuffer != NULL || buffer != NULL

crypto\bio\b_print.c

<NULL>

0123456789abcdef

0123456789ABCDEF

0123456789

A-C

?FILE pointer

crypto\bio\bss_file.c

fopen('

','

crypto\buffer\buffer.c

@@You need to read the OpenSSL FAQ, https://www.openssl.org/docs/faq.html

....................

crypto\rand\md_rand.c

crypto\pem\pem_oth.c

X509_REQ

signature

sig_alg

req_info

X509_REQ_INFO

attributes

pubkey

subject

version

0123456789ABCDEF

Proc-Type:

ENCRYPTED

DEK-Info:

crypto\pem\pem_lib.c

phrase is too short, needs to be at least %d chars

Enter PEM pass phrase:

Proc-Type: 4,

BAD-TYPE

MIC-ONLY

MIC-CLEAR

ENCRYPTED

DEK-Info:

-----END

-----

-----BEGIN

CMS

PKCS #7 SIGNED DATA

TRUSTED CERTIFICATE

X509 CERTIFICATE

PARAMETERS

PRIVATE KEY

ENCRYPTED PRIVATE KEY

ANY PRIVATE KEY

assertion failed: strlen(objstr) + 23 + 2 * EVP_CIPHER_iv_length(enc) + 13 <= sizeof buf

assertion failed: EVP_CIPHER_iv_length(enc) <= (int)sizeof(iv)

Expecting:

X509_CRL

crl

X509_CRL_INFO

revoked

nextUpdate

lastUpdate

issuer

X509_REVOKED

extensions

revocationDate

serialNumber

PKCS7_ATTR_VERIFY

PKCS7_ATTR_SIGN

PKCS7_ATTRIBUTES

PKCS7_DIGEST

digest

PKCS7_ENCRYPT

PKCS7_SIGN_ENVELOPE

PKCS7_ENC_CONTENT

algorithm

content_type

PKCS7_RECIP_INFO

enc_key

key_enc_algor

PKCS7_ENVELOPE

enc_data

recipientinfo

PKCS7_ISSUER_AND_SERIAL

serial

PKCS7_SIGNER_INFO

unauth_attr

enc_digest

digest_enc_alg

auth_attr

digest_alg

issuer_and_serial

PKCS7_SIGNED

signer_info

cert

contents

md_algs

type

d.encrypted

d.digest

d.signed_and_enveloped

d.enveloped

d.sign

d.data

d.other

NETSCAPE_CERT_SEQUENCE

certs

crypto\evp\p_lib.c

%s algorithm "%s" unsupported

Public Key

crypto\pem\pem_pkey.c

RSA_OAEP_PARAMS

pSourceFunc

maskGenFunc

hashFunc

RSA_PSS_PARAMS

trailerField

saltLength

maskGenAlgorithm

hashAlgorithm

RSA

X509_PUBKEY

public_key

algor

H/O

</O

h/O

P/O

0/O

crypto\x509\x_pubkey.c

crypto\dsa\dsa_lib.c

DSA

priv_key

pub_key

DSA_SIG

crypto\dsa\dsa_asn1.c

crypto\ec\ec_key.c

assertion failed: eckey->group->meth->keygen != NULL

ECDSA_SIG

EC_PRIVATEKEY

publicKey

parameters

privateKey

ECPKPARAMETERS

value.implicitlyCA

value.parameters

value.named_curve

ECPARAMETERS

cofactor

order

base

curve

fieldID

X9_62_CURVE

seed

X9_62_FIELDID

fieldType

p.char_two

p.prime

X9_62_CHARACTERISTIC_TWO

p.ppBasis

p.tpBasis

p.onBasis

p.other

X9_62_PENTANOMIAL

certificate extensions

set-certExt

set-policy

set-attr

message extensions

set-msgExt

content types

set-ctype

Secure Electronic Transactions

id-set

pseudonym

generationQualifier

id-hex-multipart-message

id-hex-partial-message

mime-mhs-bodies

mime-mhs-headings

MIME MHS

mime-mhs

x500UniqueIdentifier

documentPublisher

audio

dITRedirect

personalSignature

subtreeMaximumQuality

subtreeMinimumQuality

singleLevelQuality

dSAQuality

buildingName

mailPreferenceOption

janetMailbox

organizationalStatus

friendlyCountryName

pagerTelephoneNumber

mobileTelephoneNumber

personalTitle

homePostalAddress

associatedName

associatedDomain

cNAMERecord

sOARecord

nSRecord

mXRecord

pilotAttributeType27

aRecord

lastModifiedBy

lastModifiedTime

otherMailbox

secretary

homeTelephoneNumber

documentLocation

documentAuthor

documentVersion

documentTitle

documentIdentifier

manager

host

userClass

photo

roomNumber

favouriteDrink

info

rfc822Mailbox

mail

textEncodedORAddress

userId

UID

qualityLabelledData

pilotDSA

pilotOrganization

simpleSecurityObject

friendlyCountry

domainRelatedObject

dNSDomain

rFC822localPart

documentSeries

room

document

account

pilotPerson

pilotObject

caseIgnoreIA5StringSyntax

iA5StringSyntax

pilotGroups

pilotObjectClass

pilotAttributeSyntax

pilotAttributeType

pilot

ucl

pss

data

Hold Instruction Reject

holdInstructionReject

Hold Instruction Call Issuer

holdInstructionCallIssuer

Hold Instruction None

holdInstructionNone

Hold Instruction Code

holdInstructionCode

aes-256-cfb

AES-256-CFB

aes-256-ofb

AES-256-OFB

aes-256-cbc

AES-256-CBC

aes-256-ecb

AES-256-ECB

aes-192-cfb

AES-192-CFB

aes-192-ofb

AES-192-OFB

aes-192-cbc

AES-192-CBC

aes-192-ecb

AES-192-ECB

aes-128-cfb

AES-128-CFB

aes-128-ofb

AES-128-OFB

aes-128-cbc

AES-128-CBC

aes-128-ecb

AES-128-ECB

Microsoft CSP Name

CSPName

ecdsa-with-SHA1

prime256v1

prime239v3

prime239v2

prime239v1

prime192v3

prime192v2

prime192v1

id-ecPublicKey

characteristic-two-field

prime-field

ANSI X9.62

ansi-X9-62

X509v3 No Revocation Available

noRevAvail

X509v3 AC Targeting

targetInformation

X509v3 Policy Constraints

policyConstraints

role

id-aca-encAttrs

Subject Information Access

subjectInfoAccess

ac-proxying

md4WithRSAEncryption

RSA-MD4

clearance

Selected Attribute Types

selected-attribute-types

Domain

domain

domainComponent

dcObject

dcobject

Enterprises

enterprises

Mail

SNMPv2

snmpv2

Security

security

Private

private

Experimental

experimental

Management

mgmt

Directory

directory

iana

IANA

dod

DOD

org

ORG

directory services - algorithms

X500algorithms

rsaSignature

Trust Root

trustRoot

path

valid

Extended OCSP Status

extendedStatus

OCSP Service Locator

serviceLocator

OCSP Archive Cutoff

archiveCutoff

OCSP No Check

noCheck

Acceptable OCSP Responses

acceptableResponses

OCSP CRL ID

CrlID

OCSP Nonce

Nonce

Basic OCSP Response

basicOCSPResponse

ad dvcs

AD_DVCS

AD Time Stamping

ad_timestamping

id-cct-PKIResponse

id-cct-PKIData

id-cct-crs

id-qcs-pkixQCSyntax-v1

id-aca-role

id-aca-group

id-aca-chargingIdentity

id-aca-accessIdentity

id-aca-authenticationInfo

id-pda-countryOfResidence

id-pda-countryOfCitizenship

id-pda-gender

id-pda-placeOfBirth

id-pda-dateOfBirth

id-on-personalData

id-cmc-confirmCertAcceptance

id-cmc-popLinkWitness

id-cmc-popLinkRandom

id-cmc-queryPending

id-cmc-responseInfo

id-cmc-regInfo

id-cmc-revokeRequest

crypto\asn1\tasn_enc.c

crypto\asn1\tasn_new.c

crypto\asn1\tasn_fre.c

crypto\asn1\a_dup.c

assertion failed: niv <= EVP_MAX_IV_LENGTH

assertion failed: nkey <= EVP_MAX_KEY_LENGTH

crypto\evp\evp_key.c

ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/

?456789:;<=

!"#$%&'()*+,-./0123

crypto\evp\encode.c

assertion failed: ctx->length <= (int)sizeof(ctx->enc_data)

assertion failed: n < (int)sizeof(ctx->enc_data)

crypto\asn1\ameth_lib.c

X509_EXTENSIONS

Extension

X509_EXTENSION

critical

--End strings of interest--

Screenshots

konedieyp[@]airmail.cc

Tags

ransomware

Details

Relationships

Description

The DearCry ransomware samples contain this email address in the ransom note as a contact for decrypting files.

uenwonken[@]memail.com

Tags

ransomware

Details

Relationships

Description

The DearCry ransomware samples contain this email address in the ransom note as a contact for decrypting files.

fdec933ca1dd1387d970eeea32ce5d1f87940dfb6a403ab5fc149813726cbd65

Tags

ransomwaretrojan

Details

Antivirus

YARA Rules

• rule CISA_10330097_01 : trojan downloader ransomware DEARCRY
  
  {
  
     meta:
  
         Author = "CISA Code & Media Analysis"
  
         Incident = "10330097"
  
         Date = "2021-03-31"
  
         Last_Modified = "20210331_1630"
  
         Actor = "n/a"
  
         Category = "Trojan Downloader Ransomware"
  
         Family = "DEARCRY"
  
         Description = "Detects DearCry Ransomware"
  
         MD5_1 = "0e55ead3b8fd305d9a54f78c7b56741a"
  
         SHA256_1 = "2b9838da7edb0decd32b086e47a31e8f5733b5981ad8247a2f9508e232589bff"
  
         MD5_2 = "cdda3913408c4c46a6c575421485fa5b"
  
         SHA256_2 = "e044d9f2d0f1260c3f4a543a1e67f33fcac265be114a1b135fd575b860d2b8c6"
  
         MD5_3 = "c6eeb14485d93f4e30fb79f3a57518fc"
  
         SHA256_3 = "feb3e6d30ba573ba23f3bd1291ca173b7879706d1fe039c34d53a4fdcdf33ede"
  
     strings:
  
         $s0 = { 8B 85 04 EA FF FF 50 8B 8D 08 EA FF FF 51 8B 55 14 52 8B 45 10 50 8D 8D 68 F0 FF FF 51 8B 95 00 EA FF FF 52 }
  
         $s1 = { 43 72 79 70 74 6F 50 72 6F 2D 58 63 68 42 }
  
         $s2 = "-----BEGIN RSA PUBLIC KEY-----"
  
         $s3 = ".CRYPT"
  
     condition:
  
         all of them
  
  }

ssdeep Matches

No matches found.

PE Metadata

PE Sections

Packers/Compilers/Cryptors

Relationships

Description

This file is a malicious 32-bit Windows executable. It has been identified as a variant of the DearCry ransomware and is similar in design and functionality to the file 2b9838da7edb0decd32b086e47a31e8f5733b5981ad8247a2f9508e232589bff. The hard-coded RSA key contained within this binary is illustrated below.



--Begin RSA public key--

MIIBCAKCAQEA5+mVBe75OvCzCW4oZHl7vqPwV2O4kgzgfp9odcL9LZc8Gy2+NJPDwrHbttKI3z4Yt3G04lX7bEp1RZjxUYfzX8qvaPC2EBduOjSN1WMSbJJrINs1IzkqXRrggJhSbp881Jr6NmpE6pns0Vfv//Hk1idHhxsXg6QKtfXlzAnRbgA1WepSDJq5H08WGFBZrgUVM0zBYI3JJH3b9jIRMVQMJUQ57w3jZpOnpFXSZoUy1YD7Y3Cu+n/Q6cEft6t29/FQgacXmeA2ajb7ssSbSntBpTpoyGc/kKoaihYPrHtNRhkMcZQayy5aXTgYtEjhzJAC+esXiTYqklWMXJS1EmUpoQIBAw==

--End RSA public key--



This ransomware provides the following ransom note within directories of encrypted files on the target system and shared drives:



--Begin ransom note--

Your file has been encrypted!

                        If you want to decrypt, please contact us.

                        konedieyp[@]airmail.cc or uenwonken[@]memail.com

                        And please send me the following hash!

                        d37fc1eabc6783a418d23a8d2ba5db5a

--End ransom note--

027119161d11ba87acc908a1d284b93a6bcafccc012e52ce390ecb9cd745bf27

Tags

ransomwaretrojan

Details

Antivirus

YARA Rules

• rule CISA_10330097_01 : trojan downloader ransomware DEARCRY
  
  {
  
     meta:
  
         Author = "CISA Code & Media Analysis"
  
         Incident = "10330097"
  
         Date = "2021-03-31"
  
         Last_Modified = "20210331_1630"
  
         Actor = "n/a"
  
         Category = "Trojan Downloader Ransomware"
  
         Family = "DEARCRY"
  
         Description = "Detects DearCry Ransomware"
  
         MD5_1 = "0e55ead3b8fd305d9a54f78c7b56741a"
  
         SHA256_1 = "2b9838da7edb0decd32b086e47a31e8f5733b5981ad8247a2f9508e232589bff"
  
         MD5_2 = "cdda3913408c4c46a6c575421485fa5b"
  
         SHA256_2 = "e044d9f2d0f1260c3f4a543a1e67f33fcac265be114a1b135fd575b860d2b8c6"
  
         MD5_3 = "c6eeb14485d93f4e30fb79f3a57518fc"
  
         SHA256_3 = "feb3e6d30ba573ba23f3bd1291ca173b7879706d1fe039c34d53a4fdcdf33ede"
  
     strings:
  
         $s0 = { 8B 85 04 EA FF FF 50 8B 8D 08 EA FF FF 51 8B 55 14 52 8B 45 10 50 8D 8D 68 F0 FF FF 51 8B 95 00 EA FF FF 52 }
  
         $s1 = { 43 72 79 70 74 6F 50 72 6F 2D 58 63 68 42 }
  
         $s2 = "-----BEGIN RSA PUBLIC KEY-----"
  
         $s3 = ".CRYPT"
  
     condition:
  
         all of them
  
  }

ssdeep Matches

No matches found.

PE Metadata

PE Sections

Packers/Compilers/Cryptors

Relationships

Description

This file is a malicious 32-bit Windows executable. It has been identified as a variant of the DearCry ransomware and is similar in design and functionality to the file 2b9838da7edb0decd32b086e47a31e8f5733b5981ad8247a2f9508e232589bff. The hard-coded RSA key contained within this binary is illustrated below.



--Begin RSA public key--

MIIBCAKCAQEA5+mVBe75OvCzCW4oZHl7vqPwV2O4kgzgfp9odcL9LZc8Gy2+NJPDwrHbttKI3z4Yt3G04lX7bEp1RZjxUYfzX8qvaPC2EBduOjSN1WMSbJJrINs1IzkqXRrggJhSbp881Jr6NmpE6pns0Vfv//Hk1idHhxsXg6QKtfXlzAnRbgA1WepSDJq5H08WGFBZrgUVM0zBYI3JJH3b9jIRMVQMJUQ57w3jZpOnpFXSZoUy1YD7Y3Cu+n/Q6cEft6t29/FQgacXmeA2ajb7ssSbSntBpTpoyGc/kKoaihYPrHtNRhkMcZQayy5aXTgYtEjhzJAC+esXiTYqklWMXJS1EmUpoQIBAw==

--End RSA public key--



This ransomware provides the following ransom note within directories of encrypted files on the target system and shared drives:



--Begin ransom note--

Your file has been encrypted!

                        If you want to decrypt, please contact us.

                        konedieyp[@]airmail.cc or uenwonken[@]memail.com

                        And please send me the following hash!

                        d37fc1eabc6783a418d23a8d2ba5db5a

--End ransom note--

e044d9f2d0f1260c3f4a543a1e67f33fcac265be114a1b135fd575b860d2b8c6

Tags

downloaderloaderransomwaretrojan

Details

Antivirus

YARA Rules

• rule CISA_10330097_01 : trojan downloader ransomware DEARCRY
  
  {
  
     meta:
  
         Author = "CISA Code & Media Analysis"
  
         Incident = "10330097"
  
         Date = "2021-03-31"
  
         Last_Modified = "20210331_1630"
  
         Actor = "n/a"
  
         Category = "Trojan Downloader Ransomware"
  
         Family = "DEARCRY"
  
         Description = "Detects DearCry Ransomware"
  
         MD5_1 = "0e55ead3b8fd305d9a54f78c7b56741a"
  
         SHA256_1 = "2b9838da7edb0decd32b086e47a31e8f5733b5981ad8247a2f9508e232589bff"
  
         MD5_2 = "cdda3913408c4c46a6c575421485fa5b"
  
         SHA256_2 = "e044d9f2d0f1260c3f4a543a1e67f33fcac265be114a1b135fd575b860d2b8c6"
  
         MD5_3 = "c6eeb14485d93f4e30fb79f3a57518fc"
  
         SHA256_3 = "feb3e6d30ba573ba23f3bd1291ca173b7879706d1fe039c34d53a4fdcdf33ede"
  
     strings:
  
         $s0 = { 8B 85 04 EA FF FF 50 8B 8D 08 EA FF FF 51 8B 55 14 52 8B 45 10 50 8D 8D 68 F0 FF FF 51 8B 95 00 EA FF FF 52 }
  
         $s1 = { 43 72 79 70 74 6F 50 72 6F 2D 58 63 68 42 }
  
         $s2 = "-----BEGIN RSA PUBLIC KEY-----"
  
         $s3 = ".CRYPT"
  
     condition:
  
         all of them
  
  }

ssdeep Matches

No matches found.

PE Metadata

PE Sections

Packers/Compilers/Cryptors

Relationships

Description

This file is a malicious 32-bit Windows executable. It has been identified as a variant of the DearCry ransomware and is similar in design and functionality to the file 2b9838da7edb0decd32b086e47a31e8f5733b5981ad8247a2f9508e232589bff. The hard-coded RSA key contained within this binary is illustrated below.



--Begin RSA public key--

MIIBCAKCAQEA5+mVBe75OvCzCW4oZHl7vqPwV2O4kgzgfp9odcL9LZc8Gy2+NJPDwrHbttKI3z4Yt3G04lX7bEp1RZjxUYfzX8qvaPC2EBduOjSN1WMSbJJrINs1IzkqXRrggJhSbp881Jr6NmpE6pns0Vfv//Hk1idHhxsXg6QKtfXlzAnRbgA1WepSDJq5H08WGFBZrgUVM0zBYI3JJH3b9jIRMVQMJUQ57w3jZpOnpFXSZoUy1YD7Y3Cu+n/Q6cEft6t29/FQgacXmeA2ajb7ssSbSntBpTpoyGc/kKoaihYPrHtNRhkMcZQayy5aXTgYtEjhzJAC+esXiTYqklWMXJS1EmUpoQIBAw==

--End RSA public key--



This ransomware provides the following ransom note within directories of encrypted files on the target system and shared drives:



--Begin ransom note--

Your file has been encrypted!

                        If you want to decrypt, please contact us.

                        konedieyp[@]airmail.cc or uenwonken[@]memail.com

                        And please send me the following hash!

                        d37fc1eabc6783a418d23a8d2ba5db5a

--End ransom note--

feb3e6d30ba573ba23f3bd1291ca173b7879706d1fe039c34d53a4fdcdf33ede

Tags

downloaderloaderransomwaretrojan

Details

Antivirus

YARA Rules

• rule CISA_10330097_01 : trojan downloader ransomware DEARCRY
  
  {
  
     meta:
  
         Author = "CISA Code & Media Analysis"
  
         Incident = "10330097"
  
         Date = "2021-03-31"
  
         Last_Modified = "20210331_1630"
  
         Actor = "n/a"
  
         Category = "Trojan Downloader Ransomware"
  
         Family = "DEARCRY"
  
         Description = "Detects DearCry Ransomware"
  
         MD5_1 = "0e55ead3b8fd305d9a54f78c7b56741a"
  
         SHA256_1 = "2b9838da7edb0decd32b086e47a31e8f5733b5981ad8247a2f9508e232589bff"
  
         MD5_2 = "cdda3913408c4c46a6c575421485fa5b"
  
         SHA256_2 = "e044d9f2d0f1260c3f4a543a1e67f33fcac265be114a1b135fd575b860d2b8c6"
  
         MD5_3 = "c6eeb14485d93f4e30fb79f3a57518fc"
  
         SHA256_3 = "feb3e6d30ba573ba23f3bd1291ca173b7879706d1fe039c34d53a4fdcdf33ede"
  
     strings:
  
         $s0 = { 8B 85 04 EA FF FF 50 8B 8D 08 EA FF FF 51 8B 55 14 52 8B 45 10 50 8D 8D 68 F0 FF FF 51 8B 95 00 EA FF FF 52 }
  
         $s1 = { 43 72 79 70 74 6F 50 72 6F 2D 58 63 68 42 }
  
         $s2 = "-----BEGIN RSA PUBLIC KEY-----"
  
         $s3 = ".CRYPT"
  
     condition:
  
         all of them
  
  }

ssdeep Matches

PE Metadata

PE Sections

Packers/Compilers/Cryptors

Relationships

Description

This file is a malicious 32 bit Windows executable. It has been identified as a variant of the DearCry ransomware and is similar in design and functionality to the file 2b9838da7edb0decd32b086e47a31e8f5733b5981ad8247a2f9508e232589bff. The hard-coded RSA key contained within this binary is illustrated below.



--Begin RSA public key--

MIIBCAKCAQEA1Qdzdr0sRv1i+hUXF6rzsLYjQ3NRuJO16S4MpmG54q5mX0TxEEh1FmkQwULatEQkDSBC1Qbi6ZNAYhvYGj4K2G2dfIexSXfazk1PkgOUWAQqrK8+r6I/03HTZd4dRq7XKhu/ElAgYc6cHqmsMfZ29GWwvsWN718kwnVKfjg+M5e/0GMWfOdKpY3rNhDu+aHj/W9OdC45gzBEm85nHK9YTHb+MA9fOeL29UEABin1Ou47Y1ZSBSq7glAXjX9XjG675VYMnNwrjQmLnbhSIEUMHtmMiJB4C8SVgfeGKBoM/eErBqZHs02FvMwXkubXMU8o8Cu0yMGRE8zZPZ39XUfLzQIBAw==

--End RSA public key--



This ransomware provides the following ransom note within directories of encrypted files on the target system and shared drives:



--Begin ransom note--

Your file has been encrypted!

                        If you want to decrypt, please contact us.

                        konedieyp[@]airmail.cc or uenwonken[@]memail.com

                        And please send me the following hash!

                        2133c369fb115ea61eebd7b62768decf

--End ransom note--

10bce0ff6597f347c3cca8363b7c81a8bff52d2ff81245cd1e66a6e11aeb25da

Tags

ransomwaretrojan

Details

Antivirus

YARA Rules

• rule CISA_10330097_01 : trojan downloader ransomware DEARCRY
  
  {
  
     meta:
  
         Author = "CISA Code & Media Analysis"
  
         Incident = "10330097"
  
         Date = "2021-03-31"
  
         Last_Modified = "20210331_1630"
  
         Actor = "n/a"
  
         Category = "Trojan Downloader Ransomware"
  
         Family = "DEARCRY"
  
         Description = "Detects DearCry Ransomware"
  
         MD5_1 = "0e55ead3b8fd305d9a54f78c7b56741a"
  
         SHA256_1 = "2b9838da7edb0decd32b086e47a31e8f5733b5981ad8247a2f9508e232589bff"
  
         MD5_2 = "cdda3913408c4c46a6c575421485fa5b"
  
         SHA256_2 = "e044d9f2d0f1260c3f4a543a1e67f33fcac265be114a1b135fd575b860d2b8c6"
  
         MD5_3 = "c6eeb14485d93f4e30fb79f3a57518fc"
  
         SHA256_3 = "feb3e6d30ba573ba23f3bd1291ca173b7879706d1fe039c34d53a4fdcdf33ede"
  
     strings:
  
         $s0 = { 8B 85 04 EA FF FF 50 8B 8D 08 EA FF FF 51 8B 55 14 52 8B 45 10 50 8D 8D 68 F0 FF FF 51 8B 95 00 EA FF FF 52 }
  
         $s1 = { 43 72 79 70 74 6F 50 72 6F 2D 58 63 68 42 }
  
         $s2 = "-----BEGIN RSA PUBLIC KEY-----"
  
         $s3 = ".CRYPT"
  
     condition:
  
         all of them
  
  }

ssdeep Matches

No matches found.

PE Metadata

PE Sections

Packers/Compilers/Cryptors

Relationships

Description

This file is a malicious 32-bit Windows executable. It has been identified as a variant of the DearCry ransomware and is similar in design and functionality to the file 2b9838da7edb0decd32b086e47a31e8f5733b5981ad8247a2f9508e232589bff. The hard-coded RSA key contained within this binary is illustrated below.



--Begin RSA public key--

MIIBCAKCAQEA1Qdzdr0sRv1i+hUXF6rzsLYjQ3NRuJO16S4MpmG54q5mX0TxEEh1FmkQwULatEQkDSBC1Qbi6ZNAYhvYGj4K2G2dfIexSXfazk1PkgOUWAQqrK8+r6I/03HTZd4dRq7XKhu/ElAgYc6cHqmsMfZ29GWwvsWN718kwnVKfjg+M5e/0GMWfOdKpY3rNhDu+aHj/W9OdC45gzBEm85nHK9YTHb+MA9fOeL29UEABin1Ou47Y1ZSBSq7glAXjX9XjG675VYMnNwrjQmLnbhSIEUMHtmMiJB4C8SVgfeGKBoM/eErBqZHs02FvMwXkubXMU8o8Cu0yMGRE8zZPZ39XUfLzQIBAw=-

--End RSA public key--



This ransomware provides the following ransom note within directories of encrypted files on the target system and shared drives:



--Begin ransom note--

Your file has been encrypted!

                        If you want to decrypt, please contact us.

                        konedieyp[@]airmail.cc or uenwonken[@]memail.com

                        And please send me the following hash!

                        2133c369fb115ea61eebd7b62768decf

--End ransom note--

CISA recommends that users and administrators consider using the following best practices to strengthen the security posture of their organization's systems. Any configuration changes should be reviewed by system owners and administrators prior to implementation to avoid unwanted impacts.

• Maintain up-to-date antivirus signatures and engines.
• Keep operating system patches up-to-date.
• Disable File and Printer sharing services. If these services are required, use strong passwords or Active Directory authentication.
• Restrict users' ability (permissions) to install and run unwanted software applications. Do not add users to the local administrators group unless required.
• Enforce a strong password policy and implement regular password changes.
• Exercise caution when opening e-mail attachments even if the attachment is expected and the sender appears to be known.
• Enable a personal firewall on agency workstations, configured to deny unsolicited connection requests.
• Disable unnecessary services on agency workstations and servers.
• Scan for and remove suspicious e-mail attachments; ensure the scanned attachment is its "true file type" (i.e., the extension matches the file header).
• Monitor users' web browsing habits; restrict access to sites with unfavorable content.
• Exercise caution when using removable media (e.g., USB thumb drives, external drives, CDs, etc.).
• Scan all software downloaded from the Internet prior to executing.
• Maintain situational awareness of the latest threats and implement appropriate Access Control Lists (ACLs).

Additional information on malware incident prevention and handling can be found in National Institute of Standards and Technology (NIST) Special Publication 800-83, "Guide to Malware Incident Prevention & Handling for Desktops and Laptops".

• 1-888-282-0870
• CISA Central (UNCLASS)
• CISA SIPR (SIPRNET)
• CISA IC (JWICS)

CISA continuously strives to improve its products and services. You can help by answering a very short series of questions about this product at the following URL: https://us-cert.cisa.gov/forms/feedback/

What is a MIFR? A Malware Initial Findings Report (MIFR) is intended to provide organizations with malware analysis in a timely manner. In most instances this report will provide initial indicators for computer and network defense. To request additional analysis, please contact CISA and provide information regarding the level of desired analysis.

What is a MAR? A Malware Analysis Report (MAR) is intended to provide organizations with more detailed malware analysis acquired via manual reverse engineering. To request additional analysis, please contact CISA and provide information regarding the level of desired analysis.

Can I edit this document? This document is not to be edited in any way by recipients. All comments or questions related to this document should be directed to the CISA at 1-888-282-0870 or CISA Service Desk.

Can I submit malware to CISA? Malware samples can be submitted via three methods:

• Web: https://malware.us-cert.gov
• E-Mail: submit@malware.us-cert.gov
• FTP: ftp.malware.us-cert.gov (anonymous)

CISA encourages you to report any suspicious activity, including cybersecurity incidents, possible malicious code, software vulnerabilities, and phishing-related scams. Reporting forms can be found on CISA's homepage at www.cisa.gov.