Analysis

  • max time kernel
    153s
  • max time network
    155s
  • platform
    windows7_x64
  • resource
    win7v20201028
  • submitted
    05-11-2020 18:51

General

  • Target

    bcd956aebc76db25ef4891d1b85eaf7151dee287c61637d59aa7c071e258f742.exe

  • Size

    251KB

  • MD5

    42c4dc5105eff86f69d8c3d0d1e9e773

  • SHA1

    a4c1c4f627ac87cb180f3e70751bf525ef658def

  • SHA256

    bcd956aebc76db25ef4891d1b85eaf7151dee287c61637d59aa7c071e258f742

  • SHA512

    8017b10da3f275a719dee0d7cdea1fc066af93a99748501d4d2519827f651d1dd7dbab5bab8f8ed268ef5cb72573c6f95a0e77e4e5e0af68a08a524feab8d91f

Malware Config

Extracted

Family

darkcomet

Botnet

User

C2

tarkovbanned.hopto.org:1337

Mutex

DC_MUTEX-BBUXYWX

Attributes
  • InstallPath

    nVidiaExpe\nvmdch.exe

  • gencode

    bZniVw7x2f7P

  • 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
  • Disables RegEdit 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 7 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 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 64 IoCs
  • Views/modifies file attributes 1 TTPs 2 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\bcd956aebc76db25ef4891d1b85eaf7151dee287c61637d59aa7c071e258f742.exe
    "C:\Users\Admin\AppData\Local\Temp\bcd956aebc76db25ef4891d1b85eaf7151dee287c61637d59aa7c071e258f742.exe"
    1⤵
    • Modifies WinLogon for persistence
    • Loads dropped DLL
    • Adds Run key to start application
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1688
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /k attrib "C:\Users\Admin\AppData\Local\Temp\bcd956aebc76db25ef4891d1b85eaf7151dee287c61637d59aa7c071e258f742.exe" +s +h
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:1136
      • C:\Windows\SysWOW64\attrib.exe
        attrib "C:\Users\Admin\AppData\Local\Temp\bcd956aebc76db25ef4891d1b85eaf7151dee287c61637d59aa7c071e258f742.exe" +s +h
        3⤵
        • Views/modifies file attributes
        PID:268
    • 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:1332
      • C:\Windows\SysWOW64\attrib.exe
        attrib "C:\Users\Admin\AppData\Local\Temp" +s +h
        3⤵
        • Views/modifies file attributes
        PID:588
    • C:\Windows\SysWOW64\notepad.exe
      notepad
      2⤵
      • Deletes itself
      PID:2024
    • C:\Users\Admin\AppData\Roaming\nVidiaExpe\nvmdch.exe
      "C:\Users\Admin\AppData\Roaming\nVidiaExpe\nvmdch.exe"
      2⤵
      • Executes dropped EXE
      • Adds Run key to start application
      • Suspicious use of SetThreadContext
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:1740
      • C:\Program Files (x86)\Internet Explorer\iexplore.exe
        "C:\Program Files (x86)\Internet Explorer\iexplore.exe"
        3⤵
        • Adds Run key to start application
        • Suspicious behavior: GetForegroundWindowSpam
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of SetWindowsHookEx
        • Suspicious use of WriteProcessMemory
        PID:1724
        • C:\Windows\SysWOW64\notepad.exe
          notepad
          4⤵
            PID:1664

    Network

    MITRE ATT&CK Enterprise v6

    Replay Monitor

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    Downloads

    • C:\Users\Admin\AppData\Roaming\nVidiaExpe\nvmdch.exe
      MD5

      42c4dc5105eff86f69d8c3d0d1e9e773

      SHA1

      a4c1c4f627ac87cb180f3e70751bf525ef658def

      SHA256

      bcd956aebc76db25ef4891d1b85eaf7151dee287c61637d59aa7c071e258f742

      SHA512

      8017b10da3f275a719dee0d7cdea1fc066af93a99748501d4d2519827f651d1dd7dbab5bab8f8ed268ef5cb72573c6f95a0e77e4e5e0af68a08a524feab8d91f

    • C:\Users\Admin\AppData\Roaming\nVidiaExpe\nvmdch.exe
      MD5

      42c4dc5105eff86f69d8c3d0d1e9e773

      SHA1

      a4c1c4f627ac87cb180f3e70751bf525ef658def

      SHA256

      bcd956aebc76db25ef4891d1b85eaf7151dee287c61637d59aa7c071e258f742

      SHA512

      8017b10da3f275a719dee0d7cdea1fc066af93a99748501d4d2519827f651d1dd7dbab5bab8f8ed268ef5cb72573c6f95a0e77e4e5e0af68a08a524feab8d91f

    • \Users\Admin\AppData\Roaming\nVidiaExpe\nvmdch.exe
      MD5

      42c4dc5105eff86f69d8c3d0d1e9e773

      SHA1

      a4c1c4f627ac87cb180f3e70751bf525ef658def

      SHA256

      bcd956aebc76db25ef4891d1b85eaf7151dee287c61637d59aa7c071e258f742

      SHA512

      8017b10da3f275a719dee0d7cdea1fc066af93a99748501d4d2519827f651d1dd7dbab5bab8f8ed268ef5cb72573c6f95a0e77e4e5e0af68a08a524feab8d91f

    • \Users\Admin\AppData\Roaming\nVidiaExpe\nvmdch.exe
      MD5

      42c4dc5105eff86f69d8c3d0d1e9e773

      SHA1

      a4c1c4f627ac87cb180f3e70751bf525ef658def

      SHA256

      bcd956aebc76db25ef4891d1b85eaf7151dee287c61637d59aa7c071e258f742

      SHA512

      8017b10da3f275a719dee0d7cdea1fc066af93a99748501d4d2519827f651d1dd7dbab5bab8f8ed268ef5cb72573c6f95a0e77e4e5e0af68a08a524feab8d91f

    • memory/268-6-0x0000000000000000-mapping.dmp
    • memory/588-5-0x0000000000000000-mapping.dmp
    • memory/1136-0-0x0000000000000000-mapping.dmp
    • memory/1332-1-0x0000000000000000-mapping.dmp
    • memory/1664-18-0x0000000000000000-mapping.dmp
    • memory/1664-17-0x00000000001E0000-0x00000000001E1000-memory.dmp
      Filesize

      4KB

    • memory/1664-16-0x0000000000000000-mapping.dmp
    • memory/1724-12-0x0000000000400000-0x00000000004B7000-memory.dmp
      Filesize

      732KB

    • memory/1724-13-0x00000000004B57C0-mapping.dmp
    • memory/1724-14-0x0000000000400000-0x00000000004B7000-memory.dmp
      Filesize

      732KB

    • memory/1724-15-0x0000000000400000-0x00000000004B7000-memory.dmp
      Filesize

      732KB

    • memory/1740-9-0x0000000000000000-mapping.dmp
    • memory/2024-3-0x00000000001D0000-0x00000000001D1000-memory.dmp
      Filesize

      4KB

    • memory/2024-4-0x0000000000000000-mapping.dmp
    • memory/2024-2-0x0000000000000000-mapping.dmp