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Analysis

  • max time kernel
    139s
  • max time network
    148s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    02/12/2024, 20:13

General

  • Target

    DcRat.exe

  • Size

    5.0MB

  • MD5

    9a2706b014494988041a7cd721dc2e77

  • SHA1

    5ca23535cb0abe9b1e5ca5466cf49323d62f1b78

  • SHA256

    9fa9476e19afbc0b9a022a568fe765b793f4966e7e0e0910a2fd07a21a8d848d

  • SHA512

    0c884f57267e478b131fe07b87ed41d6727fd678bd74c7e8b75de61f13f0365c185649453772cb7fefee96ddccb2d51b4d1a52edf551ea34faec1aa06ebbfdab

  • SSDEEP

    98304:ya4YLGi2jelUpj0d7+k1pGlW5j6cZoEMHAh8qreWpOEnGFPHHLbqV:ynYrksv1p7ZZoEMgxtpORFHPA

Malware Config

Extracted

Family

asyncrat

Version

1.0.7

Botnet

Default

C2

31.220.90.137:8848

Mutex

DcRatMutex_qwqdanchun

Attributes
  • delay

    1

  • install

    true

  • install_file

    Desktop Window Manager.exe

  • install_folder

    %Temp%

aes.plain

Signatures

  • AsyncRat

    AsyncRAT is designed to remotely monitor and control other computers written in C#.

  • Asyncrat family
  • Async RAT payload 1 IoCs
  • Checks computer location settings 2 TTPs 3 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Executes dropped EXE 3 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • System Location Discovery: System Language Discovery 1 TTPs 2 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

  • Delays execution with timeout.exe 1 IoCs
  • Modifies registry class 1 IoCs
  • Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Suspicious behavior: EnumeratesProcesses 53 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of FindShellTrayWindow 1 IoCs
  • Suspicious use of SendNotifyMessage 1 IoCs
  • Suspicious use of WriteProcessMemory 17 IoCs
  • Uses Task Scheduler COM API 1 TTPs

    The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.

Processes

  • C:\Users\Admin\AppData\Local\Temp\DcRat.exe
    "C:\Users\Admin\AppData\Local\Temp\DcRat.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Modifies registry class
    • Suspicious use of WriteProcessMemory
    PID:3992
    • C:\Windows\SysWOW64\WScript.exe
      "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\RarSFX0\run.vbs"
      2⤵
      • Checks computer location settings
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:4712
      • C:\Users\Admin\AppData\Local\Temp\RarSFX0\DcRat.exe
        "C:\Users\Admin\AppData\Local\Temp\RarSFX0\DcRat.exe"
        3⤵
        • Executes dropped EXE
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of FindShellTrayWindow
        • Suspicious use of SendNotifyMessage
        PID:4524
      • C:\Users\Admin\AppData\Local\Temp\RarSFX0\DesktopWindowManager.exe
        "C:\Users\Admin\AppData\Local\Temp\RarSFX0\DesktopWindowManager.exe"
        3⤵
        • Checks computer location settings
        • Executes dropped EXE
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:2596
        • C:\Windows\System32\cmd.exe
          "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "Desktop Window Manager" /tr '"C:\Users\Admin\AppData\Local\Temp\Desktop Window Manager.exe"' & exit
          4⤵
          • Suspicious use of WriteProcessMemory
          PID:4904
          • C:\Windows\system32\schtasks.exe
            schtasks /create /f /sc onlogon /rl highest /tn "Desktop Window Manager" /tr '"C:\Users\Admin\AppData\Local\Temp\Desktop Window Manager.exe"'
            5⤵
            • Scheduled Task/Job: Scheduled Task
            PID:1976
        • C:\Windows\system32\cmd.exe
          C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpBAF3.tmp.bat""
          4⤵
          • Suspicious use of WriteProcessMemory
          PID:60
          • C:\Windows\system32\timeout.exe
            timeout 3
            5⤵
            • Delays execution with timeout.exe
            PID:4640
          • C:\Users\Admin\AppData\Local\Temp\Desktop Window Manager.exe
            "C:\Users\Admin\AppData\Local\Temp\Desktop Window Manager.exe"
            5⤵
            • Executes dropped EXE
            • Suspicious use of AdjustPrivilegeToken
            PID:3064
  • C:\Windows\system32\wbem\WmiApSrv.exe
    C:\Windows\system32\wbem\WmiApSrv.exe
    1⤵
      PID:3656

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

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    Downloads

    • C:\Users\Admin\AppData\Local\Temp\RarSFX0\DcRat.exe

      Filesize

      12.3MB

      MD5

      7fce411ea2b74f227489659113960b18

      SHA1

      543d95b74193a188fe273ce7b065aa177405beb5

      SHA256

      c73b1ffa39c5843b2ed951ac48350d1deb33db4057341f1dab1ee64ea1a62248

      SHA512

      42de7bc4a0b47e1053ff3ff52a3f887e56759f81cfa691996a533d769e80f98b3e8dcf869785fce801d9cc7a2bc3d675e2eb832b520846b053d6b07093be2678

    • C:\Users\Admin\AppData\Local\Temp\RarSFX0\DesktopWindowManager.exe

      Filesize

      48KB

      MD5

      a175ae25d7f7ed25d6707e87f42e017c

      SHA1

      532786d28fd7e39ea6de8a454ef58c13b9dcb00d

      SHA256

      b2b45e365957b4a7c9fbad9d269652e5f96f709dc7a0828fbc757d9339b44e82

      SHA512

      b5a7ef58afe4cca624e3b13327a3f10a2b44b47f757cbd521e34c5857ba02e502fc8c1732c2f0b9652f636ea34ad168d44a139dd1e7ac480db75848aefa0aae0

    • C:\Users\Admin\AppData\Local\Temp\RarSFX0\run.vbs

      Filesize

      288B

      MD5

      b1ddcdfe8cb8410ee62eac12e0825689

      SHA1

      0a755b1f8fd422aea80574161ca21d5506aa213d

      SHA256

      dac31763f9fd7e0c565d5aecbb6a142bb5e1c6a607b6c4d36f4932050765c0ef

      SHA512

      bca697ba83e99504f33b6df858f3ed395ccb7124df2b3212ae1237907be46ab7f773e53bab585d967a825e4c5baa07149559218cbc384378a8c70365e53c9910

    • C:\Users\Admin\AppData\Local\Temp\tmpBAF3.tmp.bat

      Filesize

      169B

      MD5

      4ca8a7a776fecc1ee55f6a8ec4f10587

      SHA1

      c06825abb83e319d49c5af1c60abda22e6b814c6

      SHA256

      365cf17f0f3afdd38554571d04402bef21d99c3fe0736aadc0d227f7aeb24b04

      SHA512

      ab5fbd02bcdf3b55032baec8c30284d349c5dfdafc84760e806da7f19f5fb9f6af57dae2ad93cbd1a7f5d10f3f1a8a150af21ad35de584d2dc195a3bfffd8c8f

    • memory/2596-14-0x0000000000010000-0x0000000000022000-memory.dmp

      Filesize

      72KB

    • memory/4524-12-0x00007FFF76943000-0x00007FFF76945000-memory.dmp

      Filesize

      8KB

    • memory/4524-15-0x000001F12D330000-0x000001F12DF7A000-memory.dmp

      Filesize

      12.3MB

    • memory/4524-24-0x00007FFF76943000-0x00007FFF76945000-memory.dmp

      Filesize

      8KB