Analysis

  • max time kernel
    150s
  • max time network
    149s
  • platform
    windows10_x64
  • resource
    win10v20210410
  • submitted
    16-05-2021 03:05

General

  • Target

    a796c6a97f238d9c70c96069464ed124c93106366f21d101b299d5fcc611f8d8.exe

  • Size

    252KB

  • MD5

    7e41570ab9678e9ab7d4ed8c7f1a008d

  • SHA1

    0d9bb329e6c5d4ba4005a7ec7431c16c28df20e6

  • SHA256

    a796c6a97f238d9c70c96069464ed124c93106366f21d101b299d5fcc611f8d8

  • SHA512

    63bcb5b37eda11106eac97fb63eaec57b1119b78a45d6aaf4ae0801e43e6c75c9f206dce4439bbd9fb57f4f3f4cdbb9f781beb02b8a4d60e05d956d8c915f1a6

Malware Config

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
  • 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.

  • UPX packed file 2 IoCs

    Detects executables packed with UPX/modified UPX open source packer.

  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Deletes itself 1 IoCs
  • Windows security modification 2 TTPs 2 IoCs
  • Adds Run key to start application 2 TTPs 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 54 IoCs
  • System policy modification 1 TTPs 3 IoCs
  • Views/modifies file attributes 1 TTPs 2 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\a796c6a97f238d9c70c96069464ed124c93106366f21d101b299d5fcc611f8d8.exe
    "C:\Users\Admin\AppData\Local\Temp\a796c6a97f238d9c70c96069464ed124c93106366f21d101b299d5fcc611f8d8.exe"
    1⤵
    • 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:3724
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /k attrib "C:\Users\Admin\AppData\Local\Temp\a796c6a97f238d9c70c96069464ed124c93106366f21d101b299d5fcc611f8d8.exe" +s +h
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:2368
      • C:\Windows\SysWOW64\attrib.exe
        attrib "C:\Users\Admin\AppData\Local\Temp\a796c6a97f238d9c70c96069464ed124c93106366f21d101b299d5fcc611f8d8.exe" +s +h
        3⤵
        • Views/modifies file attributes
        PID:2336
    • 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:2408
      • C:\Windows\SysWOW64\attrib.exe
        attrib "C:\Users\Admin\AppData\Local\Temp" +s +h
        3⤵
        • Views/modifies file attributes
        PID:3984
    • C:\Windows\SysWOW64\notepad.exe
      notepad
      2⤵
      • Deletes itself
      PID:2608
    • C:\ProgramData\Microsoft\Windows\Start Menu\Programs\MSDCSC\msdcsc.exe
      "C:\ProgramData\Microsoft\Windows\Start Menu\Programs\MSDCSC\msdcsc.exe"
      2⤵
      • Modifies firewall policy service
      • Modifies security service
      • Executes dropped EXE
      • Windows security modification
      • Adds Run key to start application
      • Suspicious behavior: GetForegroundWindowSpam
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      • System policy modification
      PID:2796
      • C:\Windows\SysWOW64\notepad.exe
        notepad
        3⤵
          PID:1356

    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:\ProgramData\Microsoft\Windows\Start Menu\Programs\MSDCSC\msdcsc.exe
      MD5

      7e41570ab9678e9ab7d4ed8c7f1a008d

      SHA1

      0d9bb329e6c5d4ba4005a7ec7431c16c28df20e6

      SHA256

      a796c6a97f238d9c70c96069464ed124c93106366f21d101b299d5fcc611f8d8

      SHA512

      63bcb5b37eda11106eac97fb63eaec57b1119b78a45d6aaf4ae0801e43e6c75c9f206dce4439bbd9fb57f4f3f4cdbb9f781beb02b8a4d60e05d956d8c915f1a6

    • C:\ProgramData\Microsoft\Windows\Start Menu\Programs\MSDCSC\msdcsc.exe
      MD5

      7e41570ab9678e9ab7d4ed8c7f1a008d

      SHA1

      0d9bb329e6c5d4ba4005a7ec7431c16c28df20e6

      SHA256

      a796c6a97f238d9c70c96069464ed124c93106366f21d101b299d5fcc611f8d8

      SHA512

      63bcb5b37eda11106eac97fb63eaec57b1119b78a45d6aaf4ae0801e43e6c75c9f206dce4439bbd9fb57f4f3f4cdbb9f781beb02b8a4d60e05d956d8c915f1a6

    • memory/1356-124-0x0000000000000000-mapping.dmp
    • memory/1356-126-0x0000000000710000-0x0000000000711000-memory.dmp
      Filesize

      4KB

    • memory/2336-123-0x0000000000000000-mapping.dmp
    • memory/2368-115-0x0000000000000000-mapping.dmp
    • memory/2408-116-0x0000000000000000-mapping.dmp
    • memory/2608-117-0x0000000000000000-mapping.dmp
    • memory/2608-119-0x0000000002FE0000-0x0000000002FE1000-memory.dmp
      Filesize

      4KB

    • memory/2796-120-0x0000000000000000-mapping.dmp
    • memory/2796-125-0x0000000000510000-0x000000000065A000-memory.dmp
      Filesize

      1.3MB

    • memory/3724-114-0x0000000000C10000-0x0000000000C11000-memory.dmp
      Filesize

      4KB

    • memory/3984-118-0x0000000000000000-mapping.dmp