Analysis

  • max time kernel
    148s
  • max time network
    152s
  • platform
    windows7_x64
  • resource
    win7-20220414-en
  • submitted
    21-05-2022 18:46

General

  • Target

    841c411cb975d201002933442dfd995194f098254d7d6762128d222a2f5a18b1.exe

  • Size

    759KB

  • MD5

    617b2beb7fd1f162b3a552a2906b5b1b

  • SHA1

    c542b59788570f5334d4ea9b3c85661ee01f0fd3

  • SHA256

    841c411cb975d201002933442dfd995194f098254d7d6762128d222a2f5a18b1

  • SHA512

    c17cd4c6b05a38b69cffb655a7cb6c27a38f33ed95e43985beb89c7a7ff99a3903f146fd1e4f6398ce5dbf5cffd96a47606c8a6919b5b6f23c30e6c0b90532c0

Malware Config

Extracted

Family

djvu

C2

http://cjto.top/nddddhsspen6/get.php

Attributes
  • extension

    .geno

  • offline_id

    Gq9C3wfB3EovXBFkGxv1b5wkUKUxVy1x63fasTt1

  • payload_url

    http://cjto.top/files/penelop/updatewin1.exe

    http://cjto.top/files/penelop/updatewin2.exe

    http://cjto.top/files/penelop/updatewin.exe

    http://cjto.top/files/penelop/3.exe

    http://cjto.top/files/penelop/4.exe

    http://cjto.top/files/penelop/5.exe

  • ransomnote

    ATTENTION! Don't worry, you can return all your files! All your files like photos, databases, documents and other important are encrypted with strongest encryption and unique key. The only method of recovering files is to purchase decrypt tool and unique key for you. This software will decrypt all your encrypted files. What guarantees you have? You can send one of your encrypted file from your PC and we decrypt it for free. But we can decrypt only 1 file for free. File must not contain valuable information. You can get and look video overview decrypt tool: https://we.tl/t-ZLZ4pVnuS4 Price of private key and decrypt software is $980. Discount 50% available if you contact us first 72 hours, that's price for you is $490. Please note that you'll never restore your data without payment. Check your e-mail "Spam" or "Junk" folder if you don't get answer more than 6 hours. To get this software you need write on our e-mail: helpmanager@mail.ch Reserve e-mail address to contact us: restoremanager@airmail.cc Your personal ID: 0248Oowhu34

rsa_pubkey.plain

Signatures

  • Detected Djvu ransomware 4 IoCs
  • Djvu Ransomware

    Ransomware which is a variant of the STOP family.

  • suricata: ET MALWARE APT-C-23 Activity (GET)

    suricata: ET MALWARE APT-C-23 Activity (GET)

  • suricata: ET MALWARE Potential Dridex.Maldoc Minimal Executable Request

    suricata: ET MALWARE Potential Dridex.Maldoc Minimal Executable Request

  • suricata: ET MALWARE Win32/Filecoder.STOP Variant Request for Public Key

    suricata: ET MALWARE Win32/Filecoder.STOP Variant Request for Public Key

  • suricata: ET MALWARE Win32/Vodkagats Loader Requesting Payload

    suricata: ET MALWARE Win32/Vodkagats Loader Requesting Payload

  • Executes dropped EXE 1 IoCs
  • Modifies file permissions 1 TTPs 1 IoCs
  • Adds Run key to start application 2 TTPs 1 IoCs
  • Looks up external IP address via web service 4 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

  • Modifies system certificate store 2 TTPs 5 IoCs
  • Suspicious behavior: EnumeratesProcesses 6 IoCs
  • Suspicious use of WriteProcessMemory 12 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\841c411cb975d201002933442dfd995194f098254d7d6762128d222a2f5a18b1.exe
    "C:\Users\Admin\AppData\Local\Temp\841c411cb975d201002933442dfd995194f098254d7d6762128d222a2f5a18b1.exe"
    1⤵
    • Adds Run key to start application
    • Modifies system certificate store
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:316
    • C:\Windows\SysWOW64\icacls.exe
      icacls "C:\Users\Admin\AppData\Local\b2a29cf5-f947-4761-b63e-9872fed24955" /deny *S-1-1-0:(OI)(CI)(DE,DC)
      2⤵
      • Modifies file permissions
      PID:1512
    • C:\Users\Admin\AppData\Local\Temp\841c411cb975d201002933442dfd995194f098254d7d6762128d222a2f5a18b1.exe
      "C:\Users\Admin\AppData\Local\Temp\841c411cb975d201002933442dfd995194f098254d7d6762128d222a2f5a18b1.exe" --Admin IsNotAutoStart IsNotTask
      2⤵
      • Modifies system certificate store
      • Suspicious behavior: EnumeratesProcesses
      PID:1556
  • C:\Windows\system32\taskeng.exe
    taskeng.exe {61E34509-0A34-497A-8352-7867CECADC1E} S-1-5-21-1083475884-596052423-1669053738-1000:WYZSGDWS\Admin:Interactive:[1]
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:1572
    • C:\Users\Admin\AppData\Local\b2a29cf5-f947-4761-b63e-9872fed24955\841c411cb975d201002933442dfd995194f098254d7d6762128d222a2f5a18b1.exe
      C:\Users\Admin\AppData\Local\b2a29cf5-f947-4761-b63e-9872fed24955\841c411cb975d201002933442dfd995194f098254d7d6762128d222a2f5a18b1.exe --Task
      2⤵
      • Executes dropped EXE
      • Suspicious behavior: EnumeratesProcesses
      PID:1612

Network

MITRE ATT&CK Matrix ATT&CK v6

Persistence

Registry Run Keys / Startup Folder

1
T1060

Defense Evasion

File Permissions Modification

1
T1222

Modify Registry

2
T1112

Install Root Certificate

1
T1130

Discovery

System Information Discovery

1
T1082

Replay Monitor

Loading Replay Monitor...

Downloads

  • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\07CEF2F654E3ED6050FFC9B6EB844250_3431D4C539FB2CFCB781821E9902850D
    Filesize

    727B

    MD5

    93995ad095112907cfc088998c161574

    SHA1

    518c7127e11809bb74ff0f68ea7e86ea5aebc798

    SHA256

    fd16d238bcac3441688e7ca940c27bb02df8f0bf43b26d8e551414a18748c1cc

    SHA512

    c2a3153c65f0acbc821bf663b38591821402d9a00680e2e22f410bf1735752194c08b96f77b7e6712082584a8b6605f7ab9552ad2f6c193fbd13c90bb60436e9

  • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\94308059B57B3142E455B38A6EB92015
    Filesize

    60KB

    MD5

    b9f21d8db36e88831e5352bb82c438b3

    SHA1

    4a3c330954f9f65a2f5fd7e55800e46ce228a3e2

    SHA256

    998e0209690a48ed33b79af30fc13851e3e3416bed97e3679b6030c10cab361e

    SHA512

    d4a2ac7c14227fbaf8b532398fb69053f0a0d913273f6917027c8cadbba80113fdbec20c2a7eb31b7bb57c99f9fdeccf8576be5f39346d8b564fc72fb1699476

  • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\B2FAF7692FD9FFBD64EDE317E42334BA_D7393C8F62BDE4D4CB606228BC7A711E
    Filesize

    471B

    MD5

    c04f441d0220712231531a90823834db

    SHA1

    68dd18f1e0c51f1fdc4621394091a2dad08e4a08

    SHA256

    055641d3987ae98e2dd627d3214ea8084ae773a3df9592191b86977c752a29e7

    SHA512

    3156cf79585a45d919d4b27da4fe860f06e3206961fe1d20347ad74ef17de81c47857f35acd5cda3fae5ade28ab9747529ea3e8e79ca80aaf98e1f0e852bed53

  • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\07CEF2F654E3ED6050FFC9B6EB844250_3431D4C539FB2CFCB781821E9902850D
    Filesize

    402B

    MD5

    f1848470dac758cdc7e190a5b4dc142e

    SHA1

    a4c2a447e75a9d4b124faddcf8990b0400190a09

    SHA256

    da025f5a3f97533baf071ebe0c5e4e8bc923fe662135c03c61990c99b1b3d543

    SHA512

    323a7c2a8ac9668c4f650685532ff590a6ecde7e490fc773060c32edff3fcf4b06dfe8edc7ed5eb6b12dee5d49db14afdd900d3ef8e3581ca773475c77ad2064

  • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
    Filesize

    344B

    MD5

    07565846e909210545296af31d39caef

    SHA1

    90af10bac13b5ee09537a6999635372141c608d8

    SHA256

    7f0fa05166f4fd381699af16e10601101c35ef26fba1dd78fb90afcfc85de8cd

    SHA512

    18df5f36e13d15739c759d38296d49038d887dc60f2fb7623b6413a2c2a03a88a1557c9e116485e56d6ba307dded4798cf4c881c2bf70774d743c2827368acd6

  • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\B2FAF7692FD9FFBD64EDE317E42334BA_D7393C8F62BDE4D4CB606228BC7A711E
    Filesize

    396B

    MD5

    a51659d57b9b3673c7b962c44a1660d9

    SHA1

    a6bba5e8d31b9582cdc4eb4c90791387b07a0c10

    SHA256

    7b125a88557a3b83781b57a157916f076247dff4083c95f0696942e00364d793

    SHA512

    54e071c82cd0fd9c470507860075012948aa222e567f597782115b57775cbe36945b1021065b6e3577989b88bd9450edf0bf7ec4ce6ded9c725791b94c1ef0f1

  • C:\Users\Admin\AppData\Local\b2a29cf5-f947-4761-b63e-9872fed24955\841c411cb975d201002933442dfd995194f098254d7d6762128d222a2f5a18b1.exe
    Filesize

    759KB

    MD5

    617b2beb7fd1f162b3a552a2906b5b1b

    SHA1

    c542b59788570f5334d4ea9b3c85661ee01f0fd3

    SHA256

    841c411cb975d201002933442dfd995194f098254d7d6762128d222a2f5a18b1

    SHA512

    c17cd4c6b05a38b69cffb655a7cb6c27a38f33ed95e43985beb89c7a7ff99a3903f146fd1e4f6398ce5dbf5cffd96a47606c8a6919b5b6f23c30e6c0b90532c0

  • C:\Users\Admin\AppData\Local\b2a29cf5-f947-4761-b63e-9872fed24955\841c411cb975d201002933442dfd995194f098254d7d6762128d222a2f5a18b1.exe
    Filesize

    759KB

    MD5

    617b2beb7fd1f162b3a552a2906b5b1b

    SHA1

    c542b59788570f5334d4ea9b3c85661ee01f0fd3

    SHA256

    841c411cb975d201002933442dfd995194f098254d7d6762128d222a2f5a18b1

    SHA512

    c17cd4c6b05a38b69cffb655a7cb6c27a38f33ed95e43985beb89c7a7ff99a3903f146fd1e4f6398ce5dbf5cffd96a47606c8a6919b5b6f23c30e6c0b90532c0

  • memory/316-54-0x0000000000340000-0x00000000003D1000-memory.dmp
    Filesize

    580KB

  • memory/316-58-0x0000000000400000-0x0000000000A12000-memory.dmp
    Filesize

    6.1MB

  • memory/316-57-0x0000000000BC0000-0x0000000000CDA000-memory.dmp
    Filesize

    1.1MB

  • memory/316-56-0x0000000000340000-0x00000000003D1000-memory.dmp
    Filesize

    580KB

  • memory/316-55-0x0000000076431000-0x0000000076433000-memory.dmp
    Filesize

    8KB

  • memory/1512-59-0x0000000000000000-mapping.dmp
  • memory/1556-62-0x0000000000A90000-0x0000000000B21000-memory.dmp
    Filesize

    580KB

  • memory/1556-70-0x0000000000A90000-0x0000000000B21000-memory.dmp
    Filesize

    580KB

  • memory/1556-71-0x0000000000400000-0x0000000000A12000-memory.dmp
    Filesize

    6.1MB

  • memory/1556-61-0x0000000000000000-mapping.dmp
  • memory/1612-72-0x0000000000000000-mapping.dmp
  • memory/1612-74-0x0000000000290000-0x0000000000321000-memory.dmp
    Filesize

    580KB

  • memory/1612-76-0x0000000000290000-0x0000000000321000-memory.dmp
    Filesize

    580KB

  • memory/1612-77-0x0000000000400000-0x0000000000A12000-memory.dmp
    Filesize

    6.1MB