Analysis

  • max time kernel
    150s
  • max time network
    57s
  • platform
    windows7_x64
  • resource
    win7-20220812-en
  • resource tags

    arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
  • submitted
    03-12-2022 03:57

General

  • Target

    d87d4d7a0dbb25f084859b8512e23f2ef94589655f2cd417c25009e9605c6998.exe

  • Size

    820KB

  • MD5

    7f0263ae88e07076889366970ce6147f

  • SHA1

    84a669be1ad036f481be5bca379b6d962523342e

  • SHA256

    d87d4d7a0dbb25f084859b8512e23f2ef94589655f2cd417c25009e9605c6998

  • SHA512

    a8b02c7cfc7296f1eae5415c4aa4f4c8b1c02ad30ea7047f9eb7e79c3c9d677b4ca5a98a87a7d48c343e5bacbb7f157af91296bcc26ec75c1600e1a95ce304e2

  • SSDEEP

    12288:9H0sGRDS9vqmZzw7JLjJoGmpuoJQQJBIwV1Kathio+:GkhqSzwRjporBB1Kj

Malware Config

Extracted

Family

darkcomet

Botnet

Strain10

C2

mediaupdate.sytes.net:1604

Mutex

DC_MUTEX-4WRRCYC

Attributes
  • InstallPath

    MSDCSC\msdcsc.exe

  • gencode

    QbtXBpuhirwF

  • install

    true

  • offline_keylogger

    false

  • persistence

    false

  • reg_key

    MediaUpdate

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 3 IoCs
  • UPX packed file 12 IoCs

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

  • Loads dropped DLL 3 IoCs
  • Adds Run key to start application 2 TTPs 2 IoCs
  • Drops file in System32 directory 3 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 64 IoCs
  • Suspicious behavior: RenamesItself 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 50 IoCs
  • Suspicious use of WriteProcessMemory 41 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\d87d4d7a0dbb25f084859b8512e23f2ef94589655f2cd417c25009e9605c6998.exe
    "C:\Users\Admin\AppData\Local\Temp\d87d4d7a0dbb25f084859b8512e23f2ef94589655f2cd417c25009e9605c6998.exe"
    1⤵
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious behavior: RenamesItself
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1948
    • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\explorer.exe
      "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\explorer.exe"
      2⤵
      • Loads dropped DLL
      • Suspicious use of SetThreadContext
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:1360
      • C:\Windows\Microsoft.NET\Framework\v2.0.50727\AppLaunch.exe
        C:\Windows\Microsoft.NET\Framework\v2.0.50727\AppLaunch.exe
        3⤵
        • 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:1304
        • C:\Windows\SysWOW64\MSDCSC\msdcsc.exe
          "C:\Windows\system32\MSDCSC\msdcsc.exe"
          4⤵
          • Executes dropped EXE
          PID:272
      • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\MsCtfMonitor.exe
        "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\MsCtfMonitor.exe"
        3⤵
        • Executes dropped EXE
        • Loads dropped DLL
        • Adds Run key to start application
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:968
        • C:\Users\Admin\AppData\Local\Temp\rtscom.exe
          "C:\Users\Admin\AppData\Local\Temp\rtscom.exe"
          4⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:1708
          • C:\Windows\Microsoft.NET\Framework\v2.0.50727\AppLaunch.exe
            C:\Windows\Microsoft.NET\Framework\v2.0.50727\AppLaunch.exe
            5⤵
            • Suspicious use of AdjustPrivilegeToken
            PID:832

Network

MITRE ATT&CK Matrix ATT&CK v6

Persistence

Winlogon Helper DLL

1
T1004

Registry Run Keys / Startup Folder

1
T1060

Defense Evasion

Modify Registry

2
T1112

Discovery

System Information Discovery

1
T1082

Replay Monitor

Loading Replay Monitor...

Downloads

  • C:\Users\Admin\AppData\Local\Temp\rtscom.exe
    Filesize

    820KB

    MD5

    7f0263ae88e07076889366970ce6147f

    SHA1

    84a669be1ad036f481be5bca379b6d962523342e

    SHA256

    d87d4d7a0dbb25f084859b8512e23f2ef94589655f2cd417c25009e9605c6998

    SHA512

    a8b02c7cfc7296f1eae5415c4aa4f4c8b1c02ad30ea7047f9eb7e79c3c9d677b4ca5a98a87a7d48c343e5bacbb7f157af91296bcc26ec75c1600e1a95ce304e2

  • C:\Users\Admin\AppData\Local\Temp\rtscom.exe
    Filesize

    820KB

    MD5

    7f0263ae88e07076889366970ce6147f

    SHA1

    84a669be1ad036f481be5bca379b6d962523342e

    SHA256

    d87d4d7a0dbb25f084859b8512e23f2ef94589655f2cd417c25009e9605c6998

    SHA512

    a8b02c7cfc7296f1eae5415c4aa4f4c8b1c02ad30ea7047f9eb7e79c3c9d677b4ca5a98a87a7d48c343e5bacbb7f157af91296bcc26ec75c1600e1a95ce304e2

  • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\MsCtfMonitor.exe
    Filesize

    10KB

    MD5

    35d27e7f59c8f5513992c45176692cea

    SHA1

    995e3161e4aec8352944d8bd89bc39336ca7e5a2

    SHA256

    81b234bc8bfc469366ecf1e050b876499350decc68014d3c3aa35b61cf7562c6

    SHA512

    7d33964473172f385deac03edab825037003fdbfe88f5695ac1832804ed46d8b068c77b30c2742688f8cbb7b15b3c245f9a9a8ecb702a39b29a0dfa41ebcdede

  • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\MsCtfMonitor.exe
    Filesize

    10KB

    MD5

    35d27e7f59c8f5513992c45176692cea

    SHA1

    995e3161e4aec8352944d8bd89bc39336ca7e5a2

    SHA256

    81b234bc8bfc469366ecf1e050b876499350decc68014d3c3aa35b61cf7562c6

    SHA512

    7d33964473172f385deac03edab825037003fdbfe88f5695ac1832804ed46d8b068c77b30c2742688f8cbb7b15b3c245f9a9a8ecb702a39b29a0dfa41ebcdede

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

    54KB

    MD5

    0f01571a3e4c71eb4313175aae86488e

    SHA1

    2ba648afe2cd52edf5f25e304f77d457abf7ac0e

    SHA256

    8cc51c4c2efc8c6a401aa83a0aeced0925d5d9d2a43192f35561893cdf704022

    SHA512

    159dfbb7d385bf92f4fc48ca389b89d69f6c2616e90dfa056e725d7da78a3702694a28f9c5cab7b55adc4d4dbd7bfe5d272c8b1c9931e3ac95f6326d74576794

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

    54KB

    MD5

    0f01571a3e4c71eb4313175aae86488e

    SHA1

    2ba648afe2cd52edf5f25e304f77d457abf7ac0e

    SHA256

    8cc51c4c2efc8c6a401aa83a0aeced0925d5d9d2a43192f35561893cdf704022

    SHA512

    159dfbb7d385bf92f4fc48ca389b89d69f6c2616e90dfa056e725d7da78a3702694a28f9c5cab7b55adc4d4dbd7bfe5d272c8b1c9931e3ac95f6326d74576794

  • \Users\Admin\AppData\Local\Temp\rtscom.exe
    Filesize

    820KB

    MD5

    7f0263ae88e07076889366970ce6147f

    SHA1

    84a669be1ad036f481be5bca379b6d962523342e

    SHA256

    d87d4d7a0dbb25f084859b8512e23f2ef94589655f2cd417c25009e9605c6998

    SHA512

    a8b02c7cfc7296f1eae5415c4aa4f4c8b1c02ad30ea7047f9eb7e79c3c9d677b4ca5a98a87a7d48c343e5bacbb7f157af91296bcc26ec75c1600e1a95ce304e2

  • \Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\MsCtfMonitor.exe
    Filesize

    10KB

    MD5

    35d27e7f59c8f5513992c45176692cea

    SHA1

    995e3161e4aec8352944d8bd89bc39336ca7e5a2

    SHA256

    81b234bc8bfc469366ecf1e050b876499350decc68014d3c3aa35b61cf7562c6

    SHA512

    7d33964473172f385deac03edab825037003fdbfe88f5695ac1832804ed46d8b068c77b30c2742688f8cbb7b15b3c245f9a9a8ecb702a39b29a0dfa41ebcdede

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

    54KB

    MD5

    0f01571a3e4c71eb4313175aae86488e

    SHA1

    2ba648afe2cd52edf5f25e304f77d457abf7ac0e

    SHA256

    8cc51c4c2efc8c6a401aa83a0aeced0925d5d9d2a43192f35561893cdf704022

    SHA512

    159dfbb7d385bf92f4fc48ca389b89d69f6c2616e90dfa056e725d7da78a3702694a28f9c5cab7b55adc4d4dbd7bfe5d272c8b1c9931e3ac95f6326d74576794

  • memory/272-87-0x0000000000000000-mapping.dmp
  • memory/832-98-0x00000000004B5760-mapping.dmp
  • memory/832-101-0x0000000000400000-0x00000000004B7000-memory.dmp
    Filesize

    732KB

  • memory/832-103-0x0000000000400000-0x00000000004B7000-memory.dmp
    Filesize

    732KB

  • memory/832-104-0x0000000000400000-0x00000000004B7000-memory.dmp
    Filesize

    732KB

  • memory/832-105-0x0000000000400000-0x00000000004B7000-memory.dmp
    Filesize

    732KB

  • memory/832-106-0x0000000000478000-0x00000000004B6000-memory.dmp
    Filesize

    248KB

  • memory/832-107-0x0000000000478000-0x00000000004B6000-memory.dmp
    Filesize

    248KB

  • memory/968-91-0x0000000074590000-0x0000000074B3B000-memory.dmp
    Filesize

    5.7MB

  • memory/968-69-0x0000000000000000-mapping.dmp
  • memory/968-83-0x0000000074590000-0x0000000074B3B000-memory.dmp
    Filesize

    5.7MB

  • memory/1304-65-0x00000000004B5760-mapping.dmp
  • memory/1304-73-0x0000000000400000-0x00000000004B7000-memory.dmp
    Filesize

    732KB

  • memory/1304-82-0x0000000000400000-0x00000000004B7000-memory.dmp
    Filesize

    732KB

  • memory/1304-61-0x0000000000400000-0x00000000004B7000-memory.dmp
    Filesize

    732KB

  • memory/1304-84-0x0000000000478000-0x00000000004B6000-memory.dmp
    Filesize

    248KB

  • memory/1304-81-0x0000000000400000-0x00000000004B7000-memory.dmp
    Filesize

    732KB

  • memory/1304-75-0x0000000000400000-0x00000000004B7000-memory.dmp
    Filesize

    732KB

  • memory/1304-60-0x0000000000400000-0x00000000004B7000-memory.dmp
    Filesize

    732KB

  • memory/1304-66-0x0000000000400000-0x00000000004B7000-memory.dmp
    Filesize

    732KB

  • memory/1304-63-0x0000000000400000-0x00000000004B7000-memory.dmp
    Filesize

    732KB

  • memory/1304-64-0x0000000000400000-0x00000000004B7000-memory.dmp
    Filesize

    732KB

  • memory/1360-59-0x0000000074590000-0x0000000074B3B000-memory.dmp
    Filesize

    5.7MB

  • memory/1360-58-0x0000000074590000-0x0000000074B3B000-memory.dmp
    Filesize

    5.7MB

  • memory/1360-55-0x0000000000000000-mapping.dmp
  • memory/1708-85-0x0000000074590000-0x0000000074B3B000-memory.dmp
    Filesize

    5.7MB

  • memory/1708-92-0x0000000074590000-0x0000000074B3B000-memory.dmp
    Filesize

    5.7MB

  • memory/1708-78-0x0000000000000000-mapping.dmp
  • memory/1948-54-0x00000000764D1000-0x00000000764D3000-memory.dmp
    Filesize

    8KB

  • memory/1948-57-0x0000000074590000-0x0000000074B3B000-memory.dmp
    Filesize

    5.7MB