Analysis

  • max time kernel
    150s
  • max time network
    150s
  • platform
    windows10_x64
  • resource
    win10v20210408
  • submitted
    30-09-2021 12:05

General

  • Target

    2e15ef27dc6e9b414c7cb2cf9ae5ce50f13f889461442c33f3128b569ede31bf.exe

  • Size

    807KB

  • MD5

    1b65c2a3c7627597b54d16d3f1b80418

  • SHA1

    383a0d1115b33a50e7c8e9875155e9033a37c8c0

  • SHA256

    2e15ef27dc6e9b414c7cb2cf9ae5ce50f13f889461442c33f3128b569ede31bf

  • SHA512

    b7ae5b9df4758c5638a332a8896292aa0e567f0253fd8f4bbb178feb0544085889972605b49baf1e8432ab944881aad69d64a9d64968a89dee2a7ab3b9abd381

Malware Config

Extracted

Family

darkcomet

Botnet

Sazan

C2

0.tcp.ngrok.io:14298

Mutex

DC_MUTEX-03KLHJJ

Attributes
  • InstallPath

    MSDCSC\msdcsc.exe

  • gencode

    JmWdVpbgJaAR

  • install

    true

  • offline_keylogger

    true

  • persistence

    true

  • reg_key

    MicroUpdate

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 6 IoCs
  • Modifies security service 2 TTPs 2 IoCs
  • Windows security bypass 2 TTPs
  • Disables RegEdit via registry modification
  • Disables Task Manager via registry modification
  • Executes dropped EXE 1 IoCs
  • Sets file to hidden 1 TTPs

    Modifies file attributes to stop it showing in Explorer etc.

  • Windows security modification 2 TTPs 2 IoCs
  • Adds Run key to start application 2 TTPs 3 IoCs
  • Suspicious use of SetThreadContext 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 42 IoCs
  • System policy modification 1 TTPs 3 IoCs
  • Views/modifies file attributes 1 TTPs 2 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\2e15ef27dc6e9b414c7cb2cf9ae5ce50f13f889461442c33f3128b569ede31bf.exe
    "C:\Users\Admin\AppData\Local\Temp\2e15ef27dc6e9b414c7cb2cf9ae5ce50f13f889461442c33f3128b569ede31bf.exe"
    1⤵
    • Modifies WinLogon for persistence
    • Adds Run key to start application
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:900
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /k attrib "C:\Users\Admin\AppData\Local\Temp\2e15ef27dc6e9b414c7cb2cf9ae5ce50f13f889461442c33f3128b569ede31bf.exe" +s +h
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:1052
      • C:\Windows\SysWOW64\attrib.exe
        attrib "C:\Users\Admin\AppData\Local\Temp\2e15ef27dc6e9b414c7cb2cf9ae5ce50f13f889461442c33f3128b569ede31bf.exe" +s +h
        3⤵
        • Views/modifies file attributes
        PID:1816
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /k attrib "C:\Users\Admin\AppData\Local\Temp" +s +h
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:1036
      • C:\Windows\SysWOW64\attrib.exe
        attrib "C:\Users\Admin\AppData\Local\Temp" +s +h
        3⤵
        • Views/modifies file attributes
        PID:1820
    • C:\Users\Admin\Documents\MSDCSC\msdcsc.exe
      "C:\Users\Admin\Documents\MSDCSC\msdcsc.exe"
      2⤵
      • Modifies firewall policy service
      • Modifies security service
      • Executes dropped EXE
      • Windows security modification
      • Adds Run key to start application
      • Suspicious use of SetThreadContext
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      • System policy modification
      PID:1304
      • C:\Program Files (x86)\Internet Explorer\iexplore.exe
        "C:\Program Files (x86)\Internet Explorer\iexplore.exe"
        3⤵
        • Modifies firewall policy service
        • Modifies security service
        • Adds Run key to start application
        • Suspicious behavior: GetForegroundWindowSpam
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of SetWindowsHookEx
        • Suspicious use of WriteProcessMemory
        PID:1916
        • C:\Windows\SysWOW64\notepad.exe
          notepad
          4⤵
            PID:2352

    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

    System Information Discovery

    1
    T1082

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\Users\Admin\Documents\MSDCSC\msdcsc.exe
      MD5

      1b65c2a3c7627597b54d16d3f1b80418

      SHA1

      383a0d1115b33a50e7c8e9875155e9033a37c8c0

      SHA256

      2e15ef27dc6e9b414c7cb2cf9ae5ce50f13f889461442c33f3128b569ede31bf

      SHA512

      b7ae5b9df4758c5638a332a8896292aa0e567f0253fd8f4bbb178feb0544085889972605b49baf1e8432ab944881aad69d64a9d64968a89dee2a7ab3b9abd381

    • C:\Users\Admin\Documents\MSDCSC\msdcsc.exe
      MD5

      1b65c2a3c7627597b54d16d3f1b80418

      SHA1

      383a0d1115b33a50e7c8e9875155e9033a37c8c0

      SHA256

      2e15ef27dc6e9b414c7cb2cf9ae5ce50f13f889461442c33f3128b569ede31bf

      SHA512

      b7ae5b9df4758c5638a332a8896292aa0e567f0253fd8f4bbb178feb0544085889972605b49baf1e8432ab944881aad69d64a9d64968a89dee2a7ab3b9abd381

    • memory/900-114-0x00000000007A0000-0x00000000007A1000-memory.dmp
      Filesize

      4KB

    • memory/1036-116-0x0000000000000000-mapping.dmp
    • memory/1052-115-0x0000000000000000-mapping.dmp
    • memory/1304-123-0x0000000002240000-0x0000000002241000-memory.dmp
      Filesize

      4KB

    • memory/1304-117-0x0000000000000000-mapping.dmp
    • memory/1816-121-0x0000000000000000-mapping.dmp
    • memory/1820-120-0x0000000000000000-mapping.dmp
    • memory/1916-122-0x0000000000400000-0x00000000004D7000-memory.dmp
      Filesize

      860KB

    • memory/1916-124-0x000000000048F888-mapping.dmp
    • memory/2352-127-0x0000000000000000-mapping.dmp
    • memory/2352-128-0x0000000003160000-0x0000000003161000-memory.dmp
      Filesize

      4KB