Analysis

  • max time kernel
    150s
  • max time network
    154s
  • platform
    windows7_x64
  • resource
    win7-20220812-en
  • resource tags

    arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
  • submitted
    30-11-2022 12:17

General

  • Target

    75d51610bad46c1d3678d6efdbbedac4fdb0459d3ef8cb4e0d638d70b4561965.exe

  • Size

    842KB

  • MD5

    209358b1bb8353a5bc3aa31016147e61

  • SHA1

    9032fa902bb5279270a64e89207543c77f3b8eb3

  • SHA256

    75d51610bad46c1d3678d6efdbbedac4fdb0459d3ef8cb4e0d638d70b4561965

  • SHA512

    a80fa8af67cebf271e6495b4baf1691266a05db8899ad3cd5d589aaa91f49bf66d1db653690477908012c01072a4abd94796cece1690a94c53fae2ad57f886a5

  • SSDEEP

    12288:I9HFJ9rJxRX1uVVjoaWSoynxdO1FVBaOiRZTERfIhNkNCCLo9Ek5C/hbwZAI:8Z1xuVVjfFoynPaVBUR8f+kN10EBCZAI

Malware Config

Extracted

Family

darkcomet

Botnet

Sazan

C2

uysalimben.duckdns.org:25565

Mutex

DC_MUTEX-QTEVKQM

Attributes
  • InstallPath

    MSDCSC\msdcsc.exe

  • gencode

    6imH2lmx94gX

  • 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 3 IoCs
  • Disables RegEdit via registry modification 1 IoCs
  • Executes dropped EXE 1 IoCs
  • Sets file to hidden 1 TTPs 2 IoCs

    Modifies file attributes to stop it showing in Explorer etc.

  • Deletes itself 1 IoCs
  • Loads dropped DLL 2 IoCs
  • Adds Run key to start application 2 TTPs 2 IoCs
  • Drops file in System32 directory 3 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • 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\75d51610bad46c1d3678d6efdbbedac4fdb0459d3ef8cb4e0d638d70b4561965.exe
    "C:\Users\Admin\AppData\Local\Temp\75d51610bad46c1d3678d6efdbbedac4fdb0459d3ef8cb4e0d638d70b4561965.exe"
    1⤵
    • 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:812
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /k attrib "C:\Users\Admin\AppData\Local\Temp\75d51610bad46c1d3678d6efdbbedac4fdb0459d3ef8cb4e0d638d70b4561965.exe" +s +h
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:2036
      • C:\Windows\SysWOW64\attrib.exe
        attrib "C:\Users\Admin\AppData\Local\Temp\75d51610bad46c1d3678d6efdbbedac4fdb0459d3ef8cb4e0d638d70b4561965.exe" +s +h
        3⤵
        • Sets file to hidden
        • Views/modifies file attributes
        PID:2008
    • 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:1104
      • C:\Windows\SysWOW64\attrib.exe
        attrib "C:\Users\Admin\AppData\Local\Temp" +s +h
        3⤵
        • Sets file to hidden
        • Views/modifies file attributes
        PID:2004
    • C:\Windows\SysWOW64\notepad.exe
      notepad
      2⤵
      • Deletes itself
      PID:1924
    • C:\Windows\SysWOW64\MSDCSC\msdcsc.exe
      "C:\Windows\system32\MSDCSC\msdcsc.exe"
      2⤵
      • Modifies firewall policy service
      • Disables RegEdit via registry modification
      • Executes dropped EXE
      • Adds Run key to start application
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:1748
      • C:\Program Files (x86)\Internet Explorer\iexplore.exe
        "C:\Program Files (x86)\Internet Explorer\iexplore.exe"
        3⤵
          PID:1004
        • C:\Windows\explorer.exe
          "C:\Windows\explorer.exe"
          3⤵
            PID:1720
          • C:\Windows\SysWOW64\notepad.exe
            notepad
            3⤵
              PID:1812

        Network

        MITRE ATT&CK Matrix ATT&CK v6

        Persistence

        Winlogon Helper DLL

        1
        T1004

        Modify Existing Service

        1
        T1031

        Hidden Files and Directories

        2
        T1158

        Registry Run Keys / Startup Folder

        1
        T1060

        Defense Evasion

        Modify Registry

        3
        T1112

        Hidden Files and Directories

        2
        T1158

        Discovery

        System Information Discovery

        1
        T1082

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        • C:\Windows\SysWOW64\MSDCSC\msdcsc.exe
          Filesize

          842KB

          MD5

          209358b1bb8353a5bc3aa31016147e61

          SHA1

          9032fa902bb5279270a64e89207543c77f3b8eb3

          SHA256

          75d51610bad46c1d3678d6efdbbedac4fdb0459d3ef8cb4e0d638d70b4561965

          SHA512

          a80fa8af67cebf271e6495b4baf1691266a05db8899ad3cd5d589aaa91f49bf66d1db653690477908012c01072a4abd94796cece1690a94c53fae2ad57f886a5

        • C:\Windows\SysWOW64\MSDCSC\msdcsc.exe
          Filesize

          842KB

          MD5

          209358b1bb8353a5bc3aa31016147e61

          SHA1

          9032fa902bb5279270a64e89207543c77f3b8eb3

          SHA256

          75d51610bad46c1d3678d6efdbbedac4fdb0459d3ef8cb4e0d638d70b4561965

          SHA512

          a80fa8af67cebf271e6495b4baf1691266a05db8899ad3cd5d589aaa91f49bf66d1db653690477908012c01072a4abd94796cece1690a94c53fae2ad57f886a5

        • \Windows\SysWOW64\MSDCSC\msdcsc.exe
          Filesize

          842KB

          MD5

          209358b1bb8353a5bc3aa31016147e61

          SHA1

          9032fa902bb5279270a64e89207543c77f3b8eb3

          SHA256

          75d51610bad46c1d3678d6efdbbedac4fdb0459d3ef8cb4e0d638d70b4561965

          SHA512

          a80fa8af67cebf271e6495b4baf1691266a05db8899ad3cd5d589aaa91f49bf66d1db653690477908012c01072a4abd94796cece1690a94c53fae2ad57f886a5

        • \Windows\SysWOW64\MSDCSC\msdcsc.exe
          Filesize

          842KB

          MD5

          209358b1bb8353a5bc3aa31016147e61

          SHA1

          9032fa902bb5279270a64e89207543c77f3b8eb3

          SHA256

          75d51610bad46c1d3678d6efdbbedac4fdb0459d3ef8cb4e0d638d70b4561965

          SHA512

          a80fa8af67cebf271e6495b4baf1691266a05db8899ad3cd5d589aaa91f49bf66d1db653690477908012c01072a4abd94796cece1690a94c53fae2ad57f886a5

        • memory/812-54-0x0000000075131000-0x0000000075133000-memory.dmp
          Filesize

          8KB

        • memory/1104-56-0x0000000000000000-mapping.dmp
        • memory/1748-63-0x0000000000000000-mapping.dmp
        • memory/1812-67-0x0000000000000000-mapping.dmp
        • memory/1924-57-0x0000000000000000-mapping.dmp
        • memory/2004-60-0x0000000000000000-mapping.dmp
        • memory/2008-59-0x0000000000000000-mapping.dmp
        • memory/2036-55-0x0000000000000000-mapping.dmp