Analysis

  • max time kernel
    171s
  • max time network
    203s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    02-12-2022 21:58

General

  • Target

    ad070f84f0be3f151a00a368b36795ed8a59d4daef83ebd0a32ffce7a6b3f78e.exe

  • Size

    482KB

  • MD5

    33d82a7ba4545a1c220fe5eaca758c9c

  • SHA1

    1ef9db72bf84b1c5d2a4ea19ae94f15706275927

  • SHA256

    ad070f84f0be3f151a00a368b36795ed8a59d4daef83ebd0a32ffce7a6b3f78e

  • SHA512

    c3171b8ec6a0507e58b31300a8f5df5643a4dfa49b0f46ae22eda475d76f82a22ba9b0b477ac1976126571dd845606450e53fc10e5a3a8f500a23eb3ef2240e9

  • SSDEEP

    12288:biO58NPU8EOwIk7/1Cy0b9GbGv6J6rB725WqOv7//Kr:T1nOwP/9qGbGv6Je7287G

Malware Config

Extracted

Family

darkcomet

Botnet

1

C2

dnlserver392.servemp3.com:88

dnlserver392.servemp3.com:1609

dnlserver392.servemp3.com:1039

dnlserver392.servemp3.com:27892

dnlserver392.servemp3.com:39892

Mutex

CLE982335NAZ4MN

Attributes
  • InstallPath

    MSDCSC\msdcsc.exe

  • gencode

    fMQfllcSj5tf

  • install

    true

  • offline_keylogger

    true

  • password

    ib2HAc2i832kg

  • persistence

    true

  • reg_key

    AdobeFlash

Signatures

  • Darkcomet

    DarkComet is a remote access trojan (RAT) developed by Jean-Pierre Lesueur.

  • Modifies WinLogon for persistence 2 TTPs 1 IoCs
  • Modifies firewall policy service 2 TTPs 3 IoCs
  • Modifies security service 2 TTPs 1 IoCs
  • Windows security bypass 2 TTPs 1 IoCs
  • Executes dropped EXE 2 IoCs
  • Sets file to hidden 1 TTPs 2 IoCs

    Modifies file attributes to stop it showing in Explorer etc.

  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Windows security modification 2 TTPs 1 IoCs
  • Adds Run key to start application 2 TTPs 2 IoCs
  • Suspicious use of SetThreadContext 2 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Modifies registry class 1 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 48 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 25 IoCs
  • System policy modification 1 TTPs 3 IoCs
  • Views/modifies file attributes 1 TTPs 2 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\ad070f84f0be3f151a00a368b36795ed8a59d4daef83ebd0a32ffce7a6b3f78e.exe
    "C:\Users\Admin\AppData\Local\Temp\ad070f84f0be3f151a00a368b36795ed8a59d4daef83ebd0a32ffce7a6b3f78e.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:604
    • C:\Users\Admin\AppData\Local\Temp\ad070f84f0be3f151a00a368b36795ed8a59d4daef83ebd0a32ffce7a6b3f78e.exe
      "C:\Users\Admin\AppData\Local\Temp\ad070f84f0be3f151a00a368b36795ed8a59d4daef83ebd0a32ffce7a6b3f78e.exe"
      2⤵
      • Modifies WinLogon for persistence
      • Checks computer location settings
      • Adds Run key to start application
      • Modifies registry class
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:4656
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /k attrib "C:\Users\Admin\AppData\Local\Temp\ad070f84f0be3f151a00a368b36795ed8a59d4daef83ebd0a32ffce7a6b3f78e.exe" +s +h
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:4324
        • C:\Windows\SysWOW64\attrib.exe
          attrib "C:\Users\Admin\AppData\Local\Temp\ad070f84f0be3f151a00a368b36795ed8a59d4daef83ebd0a32ffce7a6b3f78e.exe" +s +h
          4⤵
          • Sets file to hidden
          • Views/modifies file attributes
          PID:4472
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /k attrib "C:\Users\Admin\AppData\Local\Temp" +s +h
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:4952
        • C:\Windows\SysWOW64\attrib.exe
          attrib "C:\Users\Admin\AppData\Local\Temp" +s +h
          4⤵
          • Sets file to hidden
          • Views/modifies file attributes
          PID:3368
      • C:\Users\Admin\Documents\MSDCSC\msdcsc.exe
        "C:\Users\Admin\Documents\MSDCSC\msdcsc.exe"
        3⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4832
        • C:\Users\Admin\Documents\MSDCSC\msdcsc.exe
          "C:\Users\Admin\Documents\MSDCSC\msdcsc.exe"
          4⤵
          • Modifies firewall policy service
          • Modifies security service
          • Windows security bypass
          • Executes dropped EXE
          • Windows security modification
          • Adds Run key to start application
          • Suspicious behavior: GetForegroundWindowSpam
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of SetWindowsHookEx
          • System policy modification
          PID:4320

Network

MITRE ATT&CK Matrix ATT&CK v6

Persistence

Winlogon Helper DLL

1
T1004

Modify Existing Service

2
T1031

Hidden Files and Directories

2
T1158

Registry Run Keys / Startup Folder

1
T1060

Defense Evasion

Modify Registry

7
T1112

Disabling Security Tools

2
T1089

Hidden Files and Directories

2
T1158

Discovery

Query Registry

1
T1012

System Information Discovery

2
T1082

Replay Monitor

Loading Replay Monitor...

Downloads

  • C:\Users\Admin\Documents\MSDCSC\msdcsc.exe
    Filesize

    482KB

    MD5

    33d82a7ba4545a1c220fe5eaca758c9c

    SHA1

    1ef9db72bf84b1c5d2a4ea19ae94f15706275927

    SHA256

    ad070f84f0be3f151a00a368b36795ed8a59d4daef83ebd0a32ffce7a6b3f78e

    SHA512

    c3171b8ec6a0507e58b31300a8f5df5643a4dfa49b0f46ae22eda475d76f82a22ba9b0b477ac1976126571dd845606450e53fc10e5a3a8f500a23eb3ef2240e9

  • C:\Users\Admin\Documents\MSDCSC\msdcsc.exe
    Filesize

    482KB

    MD5

    33d82a7ba4545a1c220fe5eaca758c9c

    SHA1

    1ef9db72bf84b1c5d2a4ea19ae94f15706275927

    SHA256

    ad070f84f0be3f151a00a368b36795ed8a59d4daef83ebd0a32ffce7a6b3f78e

    SHA512

    c3171b8ec6a0507e58b31300a8f5df5643a4dfa49b0f46ae22eda475d76f82a22ba9b0b477ac1976126571dd845606450e53fc10e5a3a8f500a23eb3ef2240e9

  • C:\Users\Admin\Documents\MSDCSC\msdcsc.exe
    Filesize

    482KB

    MD5

    33d82a7ba4545a1c220fe5eaca758c9c

    SHA1

    1ef9db72bf84b1c5d2a4ea19ae94f15706275927

    SHA256

    ad070f84f0be3f151a00a368b36795ed8a59d4daef83ebd0a32ffce7a6b3f78e

    SHA512

    c3171b8ec6a0507e58b31300a8f5df5643a4dfa49b0f46ae22eda475d76f82a22ba9b0b477ac1976126571dd845606450e53fc10e5a3a8f500a23eb3ef2240e9

  • memory/3368-140-0x0000000000000000-mapping.dmp
  • memory/4320-151-0x0000000000400000-0x00000000004B0000-memory.dmp
    Filesize

    704KB

  • memory/4320-150-0x0000000000400000-0x00000000004B0000-memory.dmp
    Filesize

    704KB

  • memory/4320-149-0x0000000000400000-0x00000000004B0000-memory.dmp
    Filesize

    704KB

  • memory/4320-145-0x0000000000000000-mapping.dmp
  • memory/4324-137-0x0000000000000000-mapping.dmp
  • memory/4472-139-0x0000000000000000-mapping.dmp
  • memory/4656-136-0x0000000000400000-0x00000000004B0000-memory.dmp
    Filesize

    704KB

  • memory/4656-144-0x0000000000400000-0x00000000004B0000-memory.dmp
    Filesize

    704KB

  • memory/4656-132-0x0000000000000000-mapping.dmp
  • memory/4656-135-0x0000000000400000-0x00000000004B0000-memory.dmp
    Filesize

    704KB

  • memory/4656-134-0x0000000000400000-0x00000000004B0000-memory.dmp
    Filesize

    704KB

  • memory/4656-133-0x0000000000400000-0x00000000004B0000-memory.dmp
    Filesize

    704KB

  • memory/4832-141-0x0000000000000000-mapping.dmp
  • memory/4952-138-0x0000000000000000-mapping.dmp