Analysis

  • max time kernel
    152s
  • max time network
    44s
  • platform
    windows7_x64
  • resource
    win7-20220812-en
  • resource tags

    arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
  • submitted
    01-10-2022 23:49

General

  • Target

    9261feab91f00446a0442a4b995534c204dc90b2cdf7c59da6f6c15c229920f7.exe

  • Size

    385KB

  • MD5

    cd433e011e7459cfdd655a746091468d

  • SHA1

    9ec239c9f172811477a912e2eabdd2e5595309fd

  • SHA256

    9261feab91f00446a0442a4b995534c204dc90b2cdf7c59da6f6c15c229920f7

  • SHA512

    e068db8e49a4585686510cb845d5a31ea50f38478bef81bf0c62818cbe17273ec7ec17fd7208a4ebe8687f50383d9323d5d00361483adbda7dd5393ba6680c25

  • SSDEEP

    6144:8cNYk1yuwEDBum3qYWnl0pd0EX3Zq2b6wfIDYm0PnLwtvDzbYgfmX4rFBgp1:8cWkbgTYWnYnt/IDYhP0pDPYYm66

Malware Config

Extracted

Family

darkcomet

Botnet

Guest16

C2

megaserver9.ddns.net:1604

Mutex

DC_MUTEX-GSZE25Q

Attributes
  • InstallPath

    MSDCSC\msdcsc.exe

  • gencode

    Rc79eTyNGsqt

  • 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
  • Modifies security service 2 TTPs 1 IoCs
  • Windows security bypass 2 TTPs 2 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.

  • UPX packed file 8 IoCs

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

  • Deletes itself 1 IoCs
  • Loads dropped DLL 2 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.

  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 46 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs
  • System policy modification 1 TTPs 3 IoCs
  • Views/modifies file attributes 1 TTPs 2 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\9261feab91f00446a0442a4b995534c204dc90b2cdf7c59da6f6c15c229920f7.exe
    "C:\Users\Admin\AppData\Local\Temp\9261feab91f00446a0442a4b995534c204dc90b2cdf7c59da6f6c15c229920f7.exe"
    1⤵
    • Modifies WinLogon for persistence
    • Loads dropped DLL
    • Adds Run key to start application
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1488
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /k attrib "C:\Users\Admin\AppData\Local\Temp\9261feab91f00446a0442a4b995534c204dc90b2cdf7c59da6f6c15c229920f7.exe" +s +h
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:1692
      • C:\Windows\SysWOW64\attrib.exe
        attrib "C:\Users\Admin\AppData\Local\Temp\9261feab91f00446a0442a4b995534c204dc90b2cdf7c59da6f6c15c229920f7.exe" +s +h
        3⤵
        • Sets file to hidden
        • Views/modifies file attributes
        PID:616
    • 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:2024
      • C:\Windows\SysWOW64\attrib.exe
        attrib "C:\Users\Admin\AppData\Local\Temp" +s +h
        3⤵
        • Sets file to hidden
        • Views/modifies file attributes
        PID:1632
    • C:\Windows\SysWOW64\notepad.exe
      notepad
      2⤵
      • Deletes itself
      PID:1628
    • C:\Users\Admin\Documents\MSDCSC\msdcsc.exe
      "C:\Users\Admin\Documents\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
      • 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:336
      • C:\Program Files (x86)\Internet Explorer\iexplore.exe
        "C:\Program Files (x86)\Internet Explorer\iexplore.exe"
        3⤵
          PID:460
        • C:\Windows\explorer.exe
          "C:\Windows\explorer.exe"
          3⤵
            PID:660
          • C:\Windows\SysWOW64\notepad.exe
            notepad
            3⤵
              PID:576

        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:\Users\Admin\Documents\MSDCSC\msdcsc.exe
          Filesize

          385KB

          MD5

          cd433e011e7459cfdd655a746091468d

          SHA1

          9ec239c9f172811477a912e2eabdd2e5595309fd

          SHA256

          9261feab91f00446a0442a4b995534c204dc90b2cdf7c59da6f6c15c229920f7

          SHA512

          e068db8e49a4585686510cb845d5a31ea50f38478bef81bf0c62818cbe17273ec7ec17fd7208a4ebe8687f50383d9323d5d00361483adbda7dd5393ba6680c25

        • C:\Users\Admin\Documents\MSDCSC\msdcsc.exe
          Filesize

          385KB

          MD5

          cd433e011e7459cfdd655a746091468d

          SHA1

          9ec239c9f172811477a912e2eabdd2e5595309fd

          SHA256

          9261feab91f00446a0442a4b995534c204dc90b2cdf7c59da6f6c15c229920f7

          SHA512

          e068db8e49a4585686510cb845d5a31ea50f38478bef81bf0c62818cbe17273ec7ec17fd7208a4ebe8687f50383d9323d5d00361483adbda7dd5393ba6680c25

        • \Users\Admin\Documents\MSDCSC\msdcsc.exe
          Filesize

          385KB

          MD5

          cd433e011e7459cfdd655a746091468d

          SHA1

          9ec239c9f172811477a912e2eabdd2e5595309fd

          SHA256

          9261feab91f00446a0442a4b995534c204dc90b2cdf7c59da6f6c15c229920f7

          SHA512

          e068db8e49a4585686510cb845d5a31ea50f38478bef81bf0c62818cbe17273ec7ec17fd7208a4ebe8687f50383d9323d5d00361483adbda7dd5393ba6680c25

        • \Users\Admin\Documents\MSDCSC\msdcsc.exe
          Filesize

          385KB

          MD5

          cd433e011e7459cfdd655a746091468d

          SHA1

          9ec239c9f172811477a912e2eabdd2e5595309fd

          SHA256

          9261feab91f00446a0442a4b995534c204dc90b2cdf7c59da6f6c15c229920f7

          SHA512

          e068db8e49a4585686510cb845d5a31ea50f38478bef81bf0c62818cbe17273ec7ec17fd7208a4ebe8687f50383d9323d5d00361483adbda7dd5393ba6680c25

        • memory/336-73-0x0000000000400000-0x00000000004FA000-memory.dmp
          Filesize

          1000KB

        • memory/336-71-0x0000000000400000-0x00000000004FA000-memory.dmp
          Filesize

          1000KB

        • memory/336-64-0x0000000000000000-mapping.dmp
        • memory/576-68-0x0000000000000000-mapping.dmp
        • memory/616-58-0x0000000000000000-mapping.dmp
        • memory/1488-54-0x0000000000400000-0x00000000004FA000-memory.dmp
          Filesize

          1000KB

        • memory/1488-70-0x00000000039D0000-0x0000000003ACA000-memory.dmp
          Filesize

          1000KB

        • memory/1488-72-0x0000000000400000-0x00000000004FA000-memory.dmp
          Filesize

          1000KB

        • memory/1488-55-0x0000000076681000-0x0000000076683000-memory.dmp
          Filesize

          8KB

        • memory/1628-60-0x0000000000000000-mapping.dmp
        • memory/1632-59-0x0000000000000000-mapping.dmp
        • memory/1692-56-0x0000000000000000-mapping.dmp
        • memory/2024-57-0x0000000000000000-mapping.dmp