Resubmissions

13/01/2025, 00:07

250113-aegj6awkdt10

12/01/2025, 09:31

250112-lg7d5syqdk10

12/01/2025, 06:04

250112-gs1zaazlax10

Analysis

  • max time kernel
    892s
  • max time network
    901s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    13/01/2025, 00:07

General

  • Target
    51c0cfc7539dc3bb883969d384a7389373a144f65ce6d1b5ec39bff2f616510a.exe
  • Size 1.3MB
  • Sample250113-aegj6awkdt
  • SHA256 51c0cfc7539dc3bb883969d384a7389373a144f65ce6d1b5ec39bff2f616510a
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • asyncrat

Version
  • v1.2.2

Botnet
  • Default

C2
  • 192.238.134.73:56003

  • 192.238.134.73:56004

  • 192.238.134.73:56005

Mutex
  • vjggiafzsllukefmlx

Attributes
  • delay

    1

  • install

    false

  • install_folder

    %AppData%

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 1 IoCs

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

  • Executes dropped EXE 2 IoCs
  • Loads dropped DLL 17 IoCs
  • Checks installed software on the system 1 TTPs

    Looks up Uninstall key entries in the registry to enumerate software on the system.

  • Command and Scripting Interpreter: PowerShell 1 TTPs 4 IoCs

    Run Powershell to execute payload.

  • Enumerates physical storage devices 1 TTPs

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

  • System Location Discovery: System Language Discovery 1 TTPs 5 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 45 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of FindShellTrayWindow 1 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 20 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\51c0cfc7539dc3bb883969d384a7389373a144f65ce6d1b5ec39bff2f616510a.exe
    C:\Users\Admin\AppData\Local\Temp\51c0cfc7539dc3bb883969d384a7389373a144f65ce6d1b5ec39bff2f616510a.exe cmd /c %SIGILL% "SIGTERM|DELETE|SIGKILL"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1440
    • C:\Users\Admin\AppData\Local\Temp\is-FNN2A.tmp\51c0cfc7539dc3bb883969d384a7389373a144f65ce6d1b5ec39bff2f616510a.tmp
      "C:\Users\Admin\AppData\Local\Temp\is-FNN2A.tmp\51c0cfc7539dc3bb883969d384a7389373a144f65ce6d1b5ec39bff2f616510a.tmp" /SL5="$901FC,948933,235520,C:\Users\Admin\AppData\Local\Temp\51c0cfc7539dc3bb883969d384a7389373a144f65ce6d1b5ec39bff2f616510a.exe" cmd /c %SIGILL% "SIGTERM|DELETE|SIGKILL"
      2⤵
      • Checks computer location settings
      • Executes dropped EXE
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:4472
      • C:\Users\Admin\AppData\Local\Temp\51c0cfc7539dc3bb883969d384a7389373a144f65ce6d1b5ec39bff2f616510a.exe
        "C:\Users\Admin\AppData\Local\Temp\51c0cfc7539dc3bb883969d384a7389373a144f65ce6d1b5ec39bff2f616510a.exe" /VERYSILENT
        3⤵
        • System Location Discovery: System Language Discovery
        • Suspicious use of WriteProcessMemory
        PID:4468
        • C:\Users\Admin\AppData\Local\Temp\is-DT6D6.tmp\51c0cfc7539dc3bb883969d384a7389373a144f65ce6d1b5ec39bff2f616510a.tmp
          "C:\Users\Admin\AppData\Local\Temp\is-DT6D6.tmp\51c0cfc7539dc3bb883969d384a7389373a144f65ce6d1b5ec39bff2f616510a.tmp" /SL5="$B0044,948933,235520,C:\Users\Admin\AppData\Local\Temp\51c0cfc7539dc3bb883969d384a7389373a144f65ce6d1b5ec39bff2f616510a.exe" /VERYSILENT
          4⤵
          • Executes dropped EXE
          • System Location Discovery: System Language Discovery
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of FindShellTrayWindow
          • Suspicious use of WriteProcessMemory
          PID:2908
          • C:\Windows\SysWOW64\regsvr32.exe
            "regsvr32.exe" /s /i:360 C:\Users\Admin\AppData\Roaming\Setup_Stork.dll
            5⤵
            • Loads dropped DLL
            • System Location Discovery: System Language Discovery
            • Suspicious use of WriteProcessMemory
            PID:1076
            • C:\Windows\system32\regsvr32.exe
              /s /i:360 C:\Users\Admin\AppData\Roaming\Setup_Stork.dll
              6⤵
              • Loads dropped DLL
              • Suspicious behavior: EnumeratesProcesses
              • Suspicious use of SetWindowsHookEx
              • Suspicious use of WriteProcessMemory
              PID:2760
              • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
                "powershell" -Command "if (Get-ScheduledTask | Where-Object { $_.Actions.Execute -eq 'regsvr32' -and $_.Actions.Arguments -eq '/S /i:360 C:\Users\Admin\AppData\Roaming\Setup_Stork.dll' }) { exit 0 } else { exit 1 }"
                7⤵
                • Command and Scripting Interpreter: PowerShell
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious use of AdjustPrivilegeToken
                PID:2392
              • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
                "powershell" "Register-ScheduledTask -Action (New-ScheduledTaskAction -Execute \"regsvr32\" -Argument \"/S /i:360 C:\Users\Admin\AppData\Roaming\Setup_Stork.dll\") -Trigger (New-ScheduledTaskTrigger -Once -At (Get-Date).AddMinutes(1) -RepetitionInterval (New-TimeSpan -Minutes 1)) -TaskName 'MicrosoftEdgeUpdateTaskMachineUA{DC6308DD-A355-475B-CC84-2B712C83758F}' -Description 'MicrosoftEdgeUpdateTaskMachineUA' -Settings (New-ScheduledTaskSettingsSet -AllowStartIfOnBatteries -DontStopIfGoingOnBatteries -ExecutionTimeLimit 0) -RunLevel Highest"
                7⤵
                • Command and Scripting Interpreter: PowerShell
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious use of AdjustPrivilegeToken
                PID:2716
              • C:\Windows\system32\regsvr32.exe
                "regsvr32" /i:360 /s C:\Users\Admin\AppData\Roaming\Setup_Stork.dll
                7⤵
                • Loads dropped DLL
                PID:4204
  • C:\Windows\system32\regsvr32.EXE
    C:\Windows\system32\regsvr32.EXE /S /i:360 C:\Users\Admin\AppData\Roaming\Setup_Stork.dll
    1⤵
    • Loads dropped DLL
    PID:3820
  • C:\Windows\system32\regsvr32.EXE
    C:\Windows\system32\regsvr32.EXE /S /i:360 C:\Users\Admin\AppData\Roaming\Setup_Stork.dll
    1⤵
    • Loads dropped DLL
    PID:3368
  • C:\Windows\system32\regsvr32.EXE
    C:\Windows\system32\regsvr32.EXE /S /i:360 C:\Users\Admin\AppData\Roaming\Setup_Stork.dll
    1⤵
    • Loads dropped DLL
    PID:4040
  • C:\Windows\system32\regsvr32.EXE
    C:\Windows\system32\regsvr32.EXE /S /i:360 C:\Users\Admin\AppData\Roaming\Setup_Stork.dll
    1⤵
    • Loads dropped DLL
    PID:848
  • C:\Windows\system32\regsvr32.EXE
    C:\Windows\system32\regsvr32.EXE /S /i:360 C:\Users\Admin\AppData\Roaming\Setup_Stork.dll
    1⤵
    • Loads dropped DLL
    PID:4868
  • C:\Windows\system32\regsvr32.EXE
    C:\Windows\system32\regsvr32.EXE /S /i:360 C:\Users\Admin\AppData\Roaming\Setup_Stork.dll
    1⤵
    • Loads dropped DLL
    PID:4424
  • C:\Windows\system32\regsvr32.EXE
    C:\Windows\system32\regsvr32.EXE /S /i:360 C:\Users\Admin\AppData\Roaming\Setup_Stork.dll
    1⤵
    • Loads dropped DLL
    PID:808
  • C:\Windows\system32\regsvr32.EXE
    C:\Windows\system32\regsvr32.EXE /S /i:360 C:\Users\Admin\AppData\Roaming\Setup_Stork.dll
    1⤵
    • Loads dropped DLL
    PID:3580
  • C:\Windows\system32\regsvr32.EXE
    C:\Windows\system32\regsvr32.EXE /S /i:360 C:\Users\Admin\AppData\Roaming\Setup_Stork.dll
    1⤵
    • Loads dropped DLL
    PID:4176
  • C:\Windows\system32\regsvr32.EXE
    C:\Windows\system32\regsvr32.EXE /S /i:360 C:\Users\Admin\AppData\Roaming\Setup_Stork.dll
    1⤵
    • Loads dropped DLL
    PID:3736
  • C:\Windows\system32\regsvr32.EXE
    C:\Windows\system32\regsvr32.EXE /S /i:360 C:\Users\Admin\AppData\Roaming\Setup_Stork.dll
    1⤵
    • Loads dropped DLL
    PID:872
  • C:\Windows\system32\regsvr32.EXE
    C:\Windows\system32\regsvr32.EXE /S /i:360 C:\Users\Admin\AppData\Roaming\Setup_Stork.dll
    1⤵
    • Loads dropped DLL
    PID:1164
  • C:\Windows\system32\regsvr32.EXE
    C:\Windows\system32\regsvr32.EXE /S /i:360 C:\Users\Admin\AppData\Roaming\Setup_Stork.dll
    1⤵
    • Loads dropped DLL
    PID:2024
  • C:\Windows\system32\regsvr32.EXE
    C:\Windows\system32\regsvr32.EXE /S /i:360 C:\Users\Admin\AppData\Roaming\Setup_Stork.dll
    1⤵
    • Loads dropped DLL
    PID:4732

Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        powershell.exe.log

        • Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log
        • Size 3KB
        • SHA256 70c3ecbaa6df88e88df4efc70968502955e890a2248269641c4e2d4668ef61bf
        • MD5 SHA1 SHA512

        StartupProfileData-NonInteractive

        • Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
        • Size 1KB
        • SHA256 092bb3d4cdd53f6faed622c982300ba8bd9ff8f07fb54ddeb81fef139e855e76
        • MD5 SHA1 SHA512

        __PSScriptPolicyTest_kgm1k403.tdl.ps1

        • Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_kgm1k403.tdl.ps1
        • Size 60B
        • SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
        • MD5 SHA1 SHA512

        51c0cfc7539dc3bb883969d384a7389373a144f65ce6d1b5ec39bff2f616510a.tmp

        • Path C:\Users\Admin\AppData\Local\Temp\is-FNN2A.tmp\51c0cfc7539dc3bb883969d384a7389373a144f65ce6d1b5ec39bff2f616510a.tmp
        • Size 1.2MB
        • SHA256 55adc6677700e166913c9f26a213d93244242b17331b4f9a606760117b698b65
        • MD5 SHA1 SHA512 SSDEEP

        _shfoldr.dll

        • Path C:\Users\Admin\AppData\Local\Temp\is-MPRK6.tmp\_isetup\_shfoldr.dll
        • Size 22KB
        • SHA256 9884e9d1b4f8a873ccbd81f8ad0ae257776d2348d027d811a56475e028360d87
        • MD5 SHA1 SHA512 SSDEEP

        Setup_Stork.dll

        • Path C:\Users\Admin\AppData\Roaming\Setup_Stork.dll
        • Size 2.6MB
        • SHA256 8ae29824b1554e170133fe7fae8b9208526f1ab1b70a6299f5befcc0482db095
        • MD5 SHA1 SHA512 SSDEEP

        memory/1440-0-0x0000000000400000-0x0000000000444000-memory.dmp

        memory/1440-19-0x0000000000400000-0x0000000000444000-memory.dmp

        memory/1440-2-0x0000000000401000-0x0000000000417000-memory.dmp

        memory/2392-43-0x000001DAE9620000-0x000001DAE9642000-memory.dmp

        memory/2760-72-0x00007FF91E5D0000-0x00007FF91E85A000-memory.dmp

        memory/2760-73-0x0000000002EF0000-0x0000000002F02000-memory.dmp

        memory/2908-26-0x0000000000400000-0x000000000053F000-memory.dmp

        memory/2908-39-0x0000000000400000-0x000000000053F000-memory.dmp

        memory/4468-14-0x0000000000400000-0x0000000000444000-memory.dmp

        memory/4468-41-0x0000000000400000-0x0000000000444000-memory.dmp

        memory/4468-16-0x0000000000400000-0x0000000000444000-memory.dmp

        memory/4472-18-0x0000000000400000-0x000000000053F000-memory.dmp

        memory/4472-7-0x0000000000400000-0x000000000053F000-memory.dmp