Analysis

  • max time kernel
    151s
  • max time network
    45s
  • platform
    windows7_x64
  • resource
    win7-20220812-en
  • resource tags

    arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
  • submitted
    19/10/2022, 16:21

General

  • Target

    8097556e0e17051497344454aea95ab1570c5c32a0947e05add17aee36411134.exe

  • Size

    349KB

  • MD5

    a18f9185d5ebc3a0aa7806b19e7ff6c0

  • SHA1

    c06b84b749a8e6c57651060c9f19572f4d9f5875

  • SHA256

    8097556e0e17051497344454aea95ab1570c5c32a0947e05add17aee36411134

  • SHA512

    98ca350ab40187bd6c764cb7a9a9e18e30a56196d0f2be1f57ca417b1b8b865fd71fbc7150933a5ddb7069f969c8c5c1861d1d8225cfb7eef27ab5eeddc16eee

  • SSDEEP

    6144:CqLzGyzpKalLBQmByTIRb5K+WrxJA6AIsPSBD3FvbXB7oOdvkoOgVQKMkXIzcQj:RphltQEI+Gc6ANP0d7bv65k4zcQj

Malware Config

Extracted

Family

darkcomet

Botnet

Guest16

C2

127.0.0.1:1604

Mutex

DC_MUTEX-YTGAJF9

Attributes
  • InstallPath

    steam.exe

  • gencode

    nTQWxdykrfam

  • install

    true

  • offline_keylogger

    true

  • persistence

    true

  • reg_key

    steam

Signatures

  • Darkcomet

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

  • Modifies WinLogon for persistence 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.

  • UPX packed file 10 IoCs

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

  • Deletes itself 1 IoCs
  • Loads dropped DLL 2 IoCs
  • Adds Run key to start application 2 TTPs 6 IoCs
  • Drops file in System32 directory 4 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.

  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 46 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs
  • Views/modifies file attributes 1 TTPs 2 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\8097556e0e17051497344454aea95ab1570c5c32a0947e05add17aee36411134.exe
    "C:\Users\Admin\AppData\Local\Temp\8097556e0e17051497344454aea95ab1570c5c32a0947e05add17aee36411134.exe"
    1⤵
    • Adds Run key to start application
    • Suspicious use of SetThreadContext
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:1840
    • C:\Users\Admin\AppData\Local\Temp\8097556e0e17051497344454aea95ab1570c5c32a0947e05add17aee36411134.exe
      C:\Users\Admin\AppData\Local\Temp\8097556e0e17051497344454aea95ab1570c5c32a0947e05add17aee36411134.exe
      2⤵
      • Modifies WinLogon for persistence
      • Loads dropped DLL
      • Adds Run key to start application
      • Drops file in System32 directory
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:836
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /k attrib "C:\Users\Admin\AppData\Local\Temp\8097556e0e17051497344454aea95ab1570c5c32a0947e05add17aee36411134.exe" +s +h
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:1136
        • C:\Windows\SysWOW64\attrib.exe
          attrib "C:\Users\Admin\AppData\Local\Temp\8097556e0e17051497344454aea95ab1570c5c32a0947e05add17aee36411134.exe" +s +h
          4⤵
          • Sets file to hidden
          • Views/modifies file attributes
          PID:984
      • C:\Windows\SysWOW64\notepad.exe
        notepad
        3⤵
        • Deletes itself
        PID:2024
      • 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:2016
        • C:\Windows\SysWOW64\attrib.exe
          attrib "C:\Users\Admin\AppData\Local\Temp" +s +h
          4⤵
          • Sets file to hidden
          • Views/modifies file attributes
          PID:1404
      • C:\Windows\SysWOW64\steam.exe
        "C:\Windows\system32\steam.exe"
        3⤵
        • Executes dropped EXE
        • Adds Run key to start application
        • Drops file in System32 directory
        • Suspicious use of SetThreadContext
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of WriteProcessMemory
        PID:1692
        • C:\Windows\SysWOW64\steam.exe
          C:\Windows\SysWOW64\steam.exe
          4⤵
          • Executes dropped EXE
          • Adds Run key to start application
          • Suspicious behavior: GetForegroundWindowSpam
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of SetWindowsHookEx
          • Suspicious use of WriteProcessMemory
          PID:1156
          • C:\Windows\SysWOW64\notepad.exe
            notepad
            5⤵
              PID:1408

    Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

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          Downloads

          • C:\Users\Admin\AppData\Roaming\InstallDir\help.exe

            Filesize

            349KB

            MD5

            a18f9185d5ebc3a0aa7806b19e7ff6c0

            SHA1

            c06b84b749a8e6c57651060c9f19572f4d9f5875

            SHA256

            8097556e0e17051497344454aea95ab1570c5c32a0947e05add17aee36411134

            SHA512

            98ca350ab40187bd6c764cb7a9a9e18e30a56196d0f2be1f57ca417b1b8b865fd71fbc7150933a5ddb7069f969c8c5c1861d1d8225cfb7eef27ab5eeddc16eee

          • C:\Windows\SysWOW64\steam.exe

            Filesize

            349KB

            MD5

            a18f9185d5ebc3a0aa7806b19e7ff6c0

            SHA1

            c06b84b749a8e6c57651060c9f19572f4d9f5875

            SHA256

            8097556e0e17051497344454aea95ab1570c5c32a0947e05add17aee36411134

            SHA512

            98ca350ab40187bd6c764cb7a9a9e18e30a56196d0f2be1f57ca417b1b8b865fd71fbc7150933a5ddb7069f969c8c5c1861d1d8225cfb7eef27ab5eeddc16eee

          • C:\Windows\SysWOW64\steam.exe

            Filesize

            349KB

            MD5

            a18f9185d5ebc3a0aa7806b19e7ff6c0

            SHA1

            c06b84b749a8e6c57651060c9f19572f4d9f5875

            SHA256

            8097556e0e17051497344454aea95ab1570c5c32a0947e05add17aee36411134

            SHA512

            98ca350ab40187bd6c764cb7a9a9e18e30a56196d0f2be1f57ca417b1b8b865fd71fbc7150933a5ddb7069f969c8c5c1861d1d8225cfb7eef27ab5eeddc16eee

          • C:\Windows\SysWOW64\steam.exe

            Filesize

            349KB

            MD5

            a18f9185d5ebc3a0aa7806b19e7ff6c0

            SHA1

            c06b84b749a8e6c57651060c9f19572f4d9f5875

            SHA256

            8097556e0e17051497344454aea95ab1570c5c32a0947e05add17aee36411134

            SHA512

            98ca350ab40187bd6c764cb7a9a9e18e30a56196d0f2be1f57ca417b1b8b865fd71fbc7150933a5ddb7069f969c8c5c1861d1d8225cfb7eef27ab5eeddc16eee

          • \Windows\SysWOW64\steam.exe

            Filesize

            349KB

            MD5

            a18f9185d5ebc3a0aa7806b19e7ff6c0

            SHA1

            c06b84b749a8e6c57651060c9f19572f4d9f5875

            SHA256

            8097556e0e17051497344454aea95ab1570c5c32a0947e05add17aee36411134

            SHA512

            98ca350ab40187bd6c764cb7a9a9e18e30a56196d0f2be1f57ca417b1b8b865fd71fbc7150933a5ddb7069f969c8c5c1861d1d8225cfb7eef27ab5eeddc16eee

          • \Windows\SysWOW64\steam.exe

            Filesize

            349KB

            MD5

            a18f9185d5ebc3a0aa7806b19e7ff6c0

            SHA1

            c06b84b749a8e6c57651060c9f19572f4d9f5875

            SHA256

            8097556e0e17051497344454aea95ab1570c5c32a0947e05add17aee36411134

            SHA512

            98ca350ab40187bd6c764cb7a9a9e18e30a56196d0f2be1f57ca417b1b8b865fd71fbc7150933a5ddb7069f969c8c5c1861d1d8225cfb7eef27ab5eeddc16eee

          • memory/836-93-0x0000000000400000-0x00000000004B7000-memory.dmp

            Filesize

            732KB

          • memory/836-64-0x0000000000400000-0x00000000004B7000-memory.dmp

            Filesize

            732KB

          • memory/836-65-0x0000000000400000-0x00000000004B7000-memory.dmp

            Filesize

            732KB

          • memory/836-66-0x0000000000400000-0x00000000004B7000-memory.dmp

            Filesize

            732KB

          • memory/836-55-0x0000000000400000-0x00000000004B7000-memory.dmp

            Filesize

            732KB

          • memory/836-56-0x0000000000400000-0x00000000004B7000-memory.dmp

            Filesize

            732KB

          • memory/836-58-0x0000000000400000-0x00000000004B7000-memory.dmp

            Filesize

            732KB

          • memory/836-59-0x0000000000400000-0x00000000004B7000-memory.dmp

            Filesize

            732KB

          • memory/836-62-0x0000000000400000-0x00000000004B7000-memory.dmp

            Filesize

            732KB

          • memory/1156-94-0x0000000000400000-0x00000000004B7000-memory.dmp

            Filesize

            732KB

          • memory/1156-95-0x0000000000400000-0x00000000004B7000-memory.dmp

            Filesize

            732KB

          • memory/1840-61-0x0000000000310000-0x0000000000314000-memory.dmp

            Filesize

            16KB

          • memory/1840-54-0x0000000076401000-0x0000000076403000-memory.dmp

            Filesize

            8KB