Analysis

  • max time kernel
    97s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    09/12/2024, 16:17

General

  • Target
    file.exe
  • Size 785KB
  • Sample241209-trc72stkfv
  • SHA256 52a610b0ad89165f4a65a504f9cdd2ecdf8310d96088529fed72463a54fcd6c8
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • asyncrat

Version
  • Venom RAT + HVNC + Stealer + Grabber v6.0.3

Botnet
  • Default

C2
  • 185.208.158.187:4449

Mutex
  • tnybaidkzovl

Attributes
  • delay

    10

  • install

    true

  • install_file

    NotepadUpdate.exe

  • install_folder

    %AppData%

aes.plain

Signatures

  • AsyncRat

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

  • Asyncrat family
  • Command and Scripting Interpreter: PowerShell 1 TTPs 2 IoCs

    Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

  • Checks computer location settings 2 TTPs 3 IoCs

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

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

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

  • Suspicious use of SetThreadContext 2 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • System Location Discovery: System Language Discovery 1 TTPs 12 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
  • Scheduled Task/Job: Scheduled Task 1 TTPs 3 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 30 IoCs
  • Suspicious use of AdjustPrivilegeToken 4 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 43 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3016
    • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Roaming\yRnixT.exe"
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • System Location Discovery: System Language Discovery
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:3312
    • C:\Windows\SysWOW64\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\yRnixT" /XML "C:\Users\Admin\AppData\Local\Temp\tmpF889.tmp"
      2⤵
      • System Location Discovery: System Language Discovery
      • Scheduled Task/Job: Scheduled Task
      PID:2068
    • C:\Users\Admin\AppData\Local\Temp\file.exe
      "C:\Users\Admin\AppData\Local\Temp\file.exe"
      2⤵
      • Checks computer location settings
      • System Location Discovery: System Language Discovery
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:2760
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "NotepadUpdate" /tr '"C:\Users\Admin\AppData\Roaming\NotepadUpdate.exe"' & exit
        3⤵
        • System Location Discovery: System Language Discovery
        • Suspicious use of WriteProcessMemory
        PID:2528
        • C:\Windows\SysWOW64\schtasks.exe
          schtasks /create /f /sc onlogon /rl highest /tn "NotepadUpdate" /tr '"C:\Users\Admin\AppData\Roaming\NotepadUpdate.exe"'
          4⤵
          • System Location Discovery: System Language Discovery
          • Scheduled Task/Job: Scheduled Task
          PID:3392
      • C:\Windows\SysWOW64\cmd.exe
        C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp2AA5.tmp.bat""
        3⤵
        • System Location Discovery: System Language Discovery
        • Suspicious use of WriteProcessMemory
        PID:2540
        • C:\Windows\SysWOW64\timeout.exe
          timeout 3
          4⤵
          • System Location Discovery: System Language Discovery
          • Delays execution with timeout.exe
          PID:2744
        • C:\Users\Admin\AppData\Roaming\NotepadUpdate.exe
          "C:\Users\Admin\AppData\Roaming\NotepadUpdate.exe"
          4⤵
          • Checks computer location settings
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • System Location Discovery: System Language Discovery
          • Suspicious use of WriteProcessMemory
          PID:2384
          • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
            "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Roaming\yRnixT.exe"
            5⤵
            • Command and Scripting Interpreter: PowerShell
            • System Location Discovery: System Language Discovery
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            PID:1440
          • C:\Windows\SysWOW64\schtasks.exe
            "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\yRnixT" /XML "C:\Users\Admin\AppData\Local\Temp\tmp77EA.tmp"
            5⤵
            • System Location Discovery: System Language Discovery
            • Scheduled Task/Job: Scheduled Task
            PID:824
          • C:\Users\Admin\AppData\Roaming\NotepadUpdate.exe
            "C:\Users\Admin\AppData\Roaming\NotepadUpdate.exe"
            5⤵
            • Executes dropped EXE
            • System Location Discovery: System Language Discovery
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            • Suspicious use of SetWindowsHookEx
            PID:1968

Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        file.exe.log

        • Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\file.exe.log
        • Size 1KB
        • SHA256 7667e538030e3f8ce2886e47a01af24cb0ea70528b1e821c5d8832c5076cb982
        • MD5 SHA1 SHA512

        powershell.exe.log

        • Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\powershell.exe.log
        • Size 2KB
        • SHA256 92099c10776bb7e3f2a8d1b82d4d40d0c4627e4f1bf754a6e58dfd2c2e97042a
        • MD5 SHA1 SHA512

        StartupProfileData-NonInteractive

        • Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
        • Size 18KB
        • SHA256 a69b88e44b307c4a47543db899b9c81ce67b6313b267e77b706ed529096471c9
        • MD5 SHA1 SHA512 SSDEEP

        __PSScriptPolicyTest_udoxae1l.zw1.ps1

        • Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_udoxae1l.zw1.ps1
        • Size 60B
        • SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
        • MD5 SHA1 SHA512

        tmp2AA5.tmp.bat

        • Path C:\Users\Admin\AppData\Local\Temp\tmp2AA5.tmp.bat
        • Size 157B
        • SHA256 8699b39b4c3d77a8da21a81d83edf2d593beb031ccdd91045aff8e77a3449b93
        • MD5 SHA1 SHA512

        tmpF889.tmp

        • Path C:\Users\Admin\AppData\Local\Temp\tmpF889.tmp
        • Size 1KB
        • SHA256 d6409c0dd6c75cee225f5b9f36847d30725ad129754df38fef74df74375985f6
        • MD5 SHA1 SHA512

        DataLogs.conf

        • Path C:\Users\Admin\AppData\Roaming\MyData\DataLogs.conf
        • Size 8B
        • SHA256 c9f9f193409217f73cc976ad078c6f8bf65d3aabcf5fad3e5a47536d47aa6761
        • MD5 SHA1 SHA512

        NotepadUpdate.exe

        • Path C:\Users\Admin\AppData\Roaming\NotepadUpdate.exe
        • Size 785KB
        • SHA256 52a610b0ad89165f4a65a504f9cdd2ecdf8310d96088529fed72463a54fcd6c8
        • MD5 SHA1 SHA512 SSDEEP

        memory/1440-96-0x0000000005BC0000-0x0000000005C0C000-memory.dmp

        memory/1440-109-0x00000000070F0000-0x0000000007104000-memory.dmp

        memory/1440-108-0x00000000070B0000-0x00000000070C1000-memory.dmp

        memory/1440-90-0x00000000054F0000-0x0000000005844000-memory.dmp

        memory/1440-107-0x0000000006D70000-0x0000000006E13000-memory.dmp

        memory/1440-97-0x0000000070600000-0x000000007064C000-memory.dmp

        memory/2760-29-0x00000000747C0000-0x0000000074F70000-memory.dmp

        memory/2760-72-0x00000000747C0000-0x0000000074F70000-memory.dmp

        memory/2760-67-0x00000000747C0000-0x0000000074F70000-memory.dmp

        memory/2760-20-0x0000000000400000-0x0000000000418000-memory.dmp

        memory/2760-23-0x00000000747C0000-0x0000000074F70000-memory.dmp

        memory/3016-8-0x00000000747C0000-0x0000000074F70000-memory.dmp

        memory/3016-28-0x00000000747C0000-0x0000000074F70000-memory.dmp

        memory/3016-9-0x0000000007500000-0x000000000755C000-memory.dmp

        memory/3016-7-0x00000000747CE000-0x00000000747CF000-memory.dmp

        memory/3016-6-0x0000000005DD0000-0x0000000005DEE000-memory.dmp

        memory/3016-0-0x00000000747CE000-0x00000000747CF000-memory.dmp

        memory/3016-4-0x0000000005A30000-0x0000000005A3A000-memory.dmp

        memory/3016-5-0x00000000747C0000-0x0000000074F70000-memory.dmp

        memory/3016-3-0x0000000005A40000-0x0000000005AD2000-memory.dmp

        memory/3016-2-0x0000000005F50000-0x00000000064F4000-memory.dmp

        memory/3016-10-0x000000000AF90000-0x000000000B02C000-memory.dmp

        memory/3016-1-0x0000000000F60000-0x0000000001028000-memory.dmp

        memory/3312-17-0x0000000005160000-0x0000000005788000-memory.dmp

        memory/3312-55-0x00000000079C0000-0x000000000803A000-memory.dmp

        memory/3312-56-0x0000000007380000-0x000000000739A000-memory.dmp

        memory/3312-57-0x00000000073F0000-0x00000000073FA000-memory.dmp

        memory/3312-58-0x0000000007600000-0x0000000007696000-memory.dmp

        memory/3312-59-0x0000000007580000-0x0000000007591000-memory.dmp

        memory/3312-60-0x00000000075B0000-0x00000000075BE000-memory.dmp

        memory/3312-61-0x00000000075C0000-0x00000000075D4000-memory.dmp

        memory/3312-62-0x00000000076C0000-0x00000000076DA000-memory.dmp

        memory/3312-63-0x00000000076A0000-0x00000000076A8000-memory.dmp

        memory/3312-66-0x00000000747C0000-0x0000000074F70000-memory.dmp

        memory/3312-54-0x0000000007240000-0x00000000072E3000-memory.dmp

        memory/3312-43-0x0000000070C60000-0x0000000070CAC000-memory.dmp

        memory/3312-53-0x0000000007220000-0x000000000723E000-memory.dmp

        memory/3312-42-0x0000000006610000-0x0000000006642000-memory.dmp

        memory/3312-41-0x0000000006100000-0x000000000614C000-memory.dmp

        memory/3312-40-0x0000000006050000-0x000000000606E000-memory.dmp

        memory/3312-39-0x0000000005A20000-0x0000000005D74000-memory.dmp

        memory/3312-25-0x00000000057C0000-0x00000000057E2000-memory.dmp

        memory/3312-26-0x0000000005860000-0x00000000058C6000-memory.dmp

        memory/3312-27-0x00000000058D0000-0x0000000005936000-memory.dmp

        memory/3312-21-0x00000000747C0000-0x0000000074F70000-memory.dmp

        memory/3312-19-0x00000000747C0000-0x0000000074F70000-memory.dmp

        memory/3312-16-0x00000000747C0000-0x0000000074F70000-memory.dmp

        memory/3312-15-0x0000000004AA0000-0x0000000004AD6000-memory.dmp