Analysis

  • max time kernel
    152s
  • max time network
    164s
  • platform
    windows7_x64
  • resource
    win7-20220812-en
  • resource tags

    arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
  • submitted
    01-10-2022 23:37

General

  • Target

    f39577e2b9f1f072160f1a7a568949e0399952e8f674bdf4a32b3f1d2ab6500d.exe

  • Size

    351KB

  • MD5

    68570f555fc1595e6ce6b2d8f34c059c

  • SHA1

    28e3ba38749acf761fcb0e2c46c6ea6d2e7fe726

  • SHA256

    f39577e2b9f1f072160f1a7a568949e0399952e8f674bdf4a32b3f1d2ab6500d

  • SHA512

    ad27cbb422c5f8c4401a725509a97de4fd75239fb2717fa4f8250e77af2125e12f518e178b3c0d4eea3616e6ba3a108fdd6ac4172f17303fb8f7df170a4f4340

  • SSDEEP

    6144:8D7cY2fgssM7Wirg9KXylmRiL+QMeC/i6isqX7UovnONztByipwxZ69I2hgplSZ1:8l8E4w5huat7UovONzbXwOlh/NVR

Malware Config

Extracted

Family

darkcomet

Botnet

Guest16

C2

79.203.54.214:1604

Mutex

DC_MUTEX-15E21A0

Attributes
  • InstallPath

    MSDCSC\msdcsc.exe

  • gencode

    Zw1LapYfDnkx

  • install

    true

  • offline_keylogger

    true

  • persistence

    false

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

    Modifies file attributes to stop it showing in Explorer etc.

  • UPX packed file 7 IoCs

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

  • Loads dropped DLL 2 IoCs
  • Windows security modification 2 TTPs 2 IoCs
  • Adds Run key to start application 2 TTPs 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 46 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 43 IoCs
  • System policy modification 1 TTPs 3 IoCs
  • Views/modifies file attributes 1 TTPs 2 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\f39577e2b9f1f072160f1a7a568949e0399952e8f674bdf4a32b3f1d2ab6500d.exe
    "C:\Users\Admin\AppData\Local\Temp\f39577e2b9f1f072160f1a7a568949e0399952e8f674bdf4a32b3f1d2ab6500d.exe"
    1⤵
    • Modifies WinLogon for persistence
    • Loads dropped DLL
    • Adds Run key to start application
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1200
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /k attrib "C:\Users\Admin\AppData\Local\Temp\f39577e2b9f1f072160f1a7a568949e0399952e8f674bdf4a32b3f1d2ab6500d.exe" +s +h
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:968
      • C:\Windows\SysWOW64\attrib.exe
        attrib "C:\Users\Admin\AppData\Local\Temp\f39577e2b9f1f072160f1a7a568949e0399952e8f674bdf4a32b3f1d2ab6500d.exe" +s +h
        3⤵
        • Sets file to hidden
        • Views/modifies file attributes
        PID:2024
    • 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:2040
      • C:\Windows\SysWOW64\attrib.exe
        attrib "C:\Users\Admin\AppData\Local\Temp" +s +h
        3⤵
        • Sets file to hidden
        • Views/modifies file attributes
        PID:2028
    • C:\ProgramData\Microsoft\Windows\Start Menu\MSDCSC\msdcsc.exe
      "C:\ProgramData\Microsoft\Windows\Start Menu\MSDCSC\msdcsc.exe"
      2⤵
      • Modifies firewall policy service
      • Modifies security service
      • Windows security bypass
      • Disables RegEdit via registry modification
      • Executes dropped EXE
      • Windows security modification
      • Suspicious behavior: GetForegroundWindowSpam
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      • System policy modification
      PID:1908
      • C:\Windows\SysWOW64\notepad.exe
        notepad
        3⤵
          PID:1960

    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:\ProgramData\Microsoft\Windows\Start Menu\MSDCSC\msdcsc.exe
      Filesize

      351KB

      MD5

      68570f555fc1595e6ce6b2d8f34c059c

      SHA1

      28e3ba38749acf761fcb0e2c46c6ea6d2e7fe726

      SHA256

      f39577e2b9f1f072160f1a7a568949e0399952e8f674bdf4a32b3f1d2ab6500d

      SHA512

      ad27cbb422c5f8c4401a725509a97de4fd75239fb2717fa4f8250e77af2125e12f518e178b3c0d4eea3616e6ba3a108fdd6ac4172f17303fb8f7df170a4f4340

    • \ProgramData\Microsoft\Windows\Start Menu\MSDCSC\msdcsc.exe
      Filesize

      351KB

      MD5

      68570f555fc1595e6ce6b2d8f34c059c

      SHA1

      28e3ba38749acf761fcb0e2c46c6ea6d2e7fe726

      SHA256

      f39577e2b9f1f072160f1a7a568949e0399952e8f674bdf4a32b3f1d2ab6500d

      SHA512

      ad27cbb422c5f8c4401a725509a97de4fd75239fb2717fa4f8250e77af2125e12f518e178b3c0d4eea3616e6ba3a108fdd6ac4172f17303fb8f7df170a4f4340

    • \ProgramData\Microsoft\Windows\Start Menu\MSDCSC\msdcsc.exe
      Filesize

      351KB

      MD5

      68570f555fc1595e6ce6b2d8f34c059c

      SHA1

      28e3ba38749acf761fcb0e2c46c6ea6d2e7fe726

      SHA256

      f39577e2b9f1f072160f1a7a568949e0399952e8f674bdf4a32b3f1d2ab6500d

      SHA512

      ad27cbb422c5f8c4401a725509a97de4fd75239fb2717fa4f8250e77af2125e12f518e178b3c0d4eea3616e6ba3a108fdd6ac4172f17303fb8f7df170a4f4340

    • memory/968-56-0x0000000000000000-mapping.dmp
    • memory/1200-54-0x0000000075091000-0x0000000075093000-memory.dmp
      Filesize

      8KB

    • memory/1200-55-0x0000000000400000-0x00000000004EC000-memory.dmp
      Filesize

      944KB

    • memory/1200-65-0x0000000000400000-0x00000000004EC000-memory.dmp
      Filesize

      944KB

    • memory/1908-62-0x0000000000000000-mapping.dmp
    • memory/1908-68-0x0000000000400000-0x00000000004EC000-memory.dmp
      Filesize

      944KB

    • memory/1908-69-0x0000000000400000-0x00000000004EC000-memory.dmp
      Filesize

      944KB

    • memory/1960-66-0x0000000000000000-mapping.dmp
    • memory/2024-59-0x0000000000000000-mapping.dmp
    • memory/2028-58-0x0000000000000000-mapping.dmp
    • memory/2040-57-0x0000000000000000-mapping.dmp