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Analysis

  • max time kernel
    128s
  • max time network
    138s
  • platform
    windows7_x64
  • resource
    win7-20240903-en
  • resource tags

    arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
  • submitted
    26/12/2024, 20:51

General

  • Target

    38e1bbae005365e92cf80aa6ef199d5107af57fde3afb02c31dc1bde875c68f7.exe

  • Size

    694KB

  • MD5

    32c67f99f3c95ba5e1816ca208f9b723

  • SHA1

    c1e29ecea3c87d671448b9dbcc8d8c67b0d14b7e

  • SHA256

    38e1bbae005365e92cf80aa6ef199d5107af57fde3afb02c31dc1bde875c68f7

  • SHA512

    578526bda2f08948475726f36bf247aabeb8f3941f95153d6786bc0db6e43bad44502ef1757bae2bb7c6f6bd0a4bd51e9b33ae363be293b75f490a26c03795f8

  • SSDEEP

    12288:btoKggb2iNdvpc++pd1yIBbrk4ct0gdK/5SVns2M2TgN/0s:5oKgK1XpSpGIZn9+YSVsggi

Malware Config

Extracted

Family

asyncrat

Version

0.5.7B

Botnet

Default

C2

37.0.14.198:6161

Mutex

AsyncMutex_6SI8OkPnk

Attributes
  • delay

    3

  • install

    true

  • install_file

    .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.

  • Executes dropped EXE 2 IoCs
  • Loads dropped DLL 2 IoCs
  • 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 5 IoCs
  • Suspicious use of AdjustPrivilegeToken 4 IoCs
  • Suspicious use of WriteProcessMemory 54 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\38e1bbae005365e92cf80aa6ef199d5107af57fde3afb02c31dc1bde875c68f7.exe
    "C:\Users\Admin\AppData\Local\Temp\38e1bbae005365e92cf80aa6ef199d5107af57fde3afb02c31dc1bde875c68f7.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2324
    • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Roaming\nxBIuIS.exe"
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • System Location Discovery: System Language Discovery
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:2676
    • C:\Windows\SysWOW64\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\nxBIuIS" /XML "C:\Users\Admin\AppData\Local\Temp\tmp88CF.tmp"
      2⤵
      • System Location Discovery: System Language Discovery
      • Scheduled Task/Job: Scheduled Task
      PID:2576
    • C:\Users\Admin\AppData\Local\Temp\38e1bbae005365e92cf80aa6ef199d5107af57fde3afb02c31dc1bde875c68f7.exe
      "C:\Users\Admin\AppData\Local\Temp\38e1bbae005365e92cf80aa6ef199d5107af57fde3afb02c31dc1bde875c68f7.exe"
      2⤵
      • System Location Discovery: System Language Discovery
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:2792
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "" /tr '"C:\Users\Admin\AppData\Roaming\.exe"' & exit
        3⤵
        • System Location Discovery: System Language Discovery
        • Suspicious use of WriteProcessMemory
        PID:484
        • C:\Windows\SysWOW64\schtasks.exe
          schtasks /create /f /sc onlogon /rl highest /tn "" /tr '"C:\Users\Admin\AppData\Roaming\.exe"'
          4⤵
          • System Location Discovery: System Language Discovery
          • Scheduled Task/Job: Scheduled Task
          PID:2472
      • C:\Windows\SysWOW64\cmd.exe
        cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmp97AD.tmp.bat""
        3⤵
        • Loads dropped DLL
        • System Location Discovery: System Language Discovery
        • Suspicious use of WriteProcessMemory
        PID:1248
        • C:\Windows\SysWOW64\timeout.exe
          timeout 3
          4⤵
          • System Location Discovery: System Language Discovery
          • Delays execution with timeout.exe
          PID:1672
        • C:\Users\Admin\AppData\Roaming\.exe
          "C:\Users\Admin\AppData\Roaming\.exe"
          4⤵
          • Executes dropped EXE
          • Loads dropped DLL
          • Suspicious use of SetThreadContext
          • System Location Discovery: System Language Discovery
          • Suspicious use of WriteProcessMemory
          PID:1604
          • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
            "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Roaming\nxBIuIS.exe"
            5⤵
            • Command and Scripting Interpreter: PowerShell
            • System Location Discovery: System Language Discovery
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            PID:2796
          • C:\Windows\SysWOW64\schtasks.exe
            "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\nxBIuIS" /XML "C:\Users\Admin\AppData\Local\Temp\tmp558F.tmp"
            5⤵
            • System Location Discovery: System Language Discovery
            • Scheduled Task/Job: Scheduled Task
            PID:2052
          • C:\Users\Admin\AppData\Roaming\.exe
            "C:\Users\Admin\AppData\Roaming\.exe"
            5⤵
            • Executes dropped EXE
            • System Location Discovery: System Language Discovery
            • Suspicious use of AdjustPrivilegeToken
            PID:1492

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • C:\Users\Admin\AppData\Local\Temp\tmp88CF.tmp

    Filesize

    1KB

    MD5

    4f90a7174bb34b400a64202a8c28ab57

    SHA1

    3d78ef9e7468afeb417af90f8aebed71e27669b8

    SHA256

    28bff45b4da73c2901a2388c85e3447680cd6f6541f543f6b2f62be5b0ee03a3

    SHA512

    b2466543740950bc2cb4ccc0194118ba8ea71bc26480fd32405de9bb1aeeb8d09196bd3c2eb5efabcf966cb634102087a892f580d5d9059142e0ace6f7830ea7

  • C:\Users\Admin\AppData\Local\Temp\tmp97AD.tmp.bat

    Filesize

    144B

    MD5

    49c7432bf76bf15717378e926ef90989

    SHA1

    280e34076f9ad4485674552a8ead54ed9b2719d1

    SHA256

    d29608900b6494810b447c7a853cd89ba7a11dcf13853588b4f0ba20cd8a63fb

    SHA512

    1c39eea4c73625389ef1161470d5d2c12b63611135a0e47cf916f2bbddc46b5dba17630e600c4a439318f9c28b38fa9ba09fe03d276ca574d2278fbaa507350e

  • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\VY5P8G29UN857R5HYKC2.temp

    Filesize

    7KB

    MD5

    ae52db759c9c845232948e3334b98364

    SHA1

    7b9526b9af163debb48d49cd2733dad282b903b3

    SHA256

    032d14063c9a4efcd702b6998b86d6c34f2267294cbe5c8efccbedf9f2e9d914

    SHA512

    deaac5507addce40033341dda9fb52ff75d4ae5483e2958dfa23cd30f402299d300c7c7e3033d895dfbba04856e2edce6c95ffe1558f90cd176c87eed015a80e

  • \Users\Admin\AppData\Roaming\.exe

    Filesize

    694KB

    MD5

    32c67f99f3c95ba5e1816ca208f9b723

    SHA1

    c1e29ecea3c87d671448b9dbcc8d8c67b0d14b7e

    SHA256

    38e1bbae005365e92cf80aa6ef199d5107af57fde3afb02c31dc1bde875c68f7

    SHA512

    578526bda2f08948475726f36bf247aabeb8f3941f95153d6786bc0db6e43bad44502ef1757bae2bb7c6f6bd0a4bd51e9b33ae363be293b75f490a26c03795f8

  • memory/1492-56-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

    Filesize

    4KB

  • memory/1492-60-0x0000000000400000-0x0000000000412000-memory.dmp

    Filesize

    72KB

  • memory/1492-62-0x0000000000400000-0x0000000000412000-memory.dmp

    Filesize

    72KB

  • memory/1604-44-0x0000000004C20000-0x0000000004C74000-memory.dmp

    Filesize

    336KB

  • memory/1604-42-0x00000000012E0000-0x0000000001394000-memory.dmp

    Filesize

    720KB

  • memory/1604-43-0x00000000004D0000-0x00000000004F4000-memory.dmp

    Filesize

    144KB

  • memory/2324-7-0x0000000004A60000-0x0000000004AB4000-memory.dmp

    Filesize

    336KB

  • memory/2324-15-0x0000000002320000-0x0000000002334000-memory.dmp

    Filesize

    80KB

  • memory/2324-1-0x0000000000B30000-0x0000000000BE4000-memory.dmp

    Filesize

    720KB

  • memory/2324-2-0x0000000074610000-0x0000000074CFE000-memory.dmp

    Filesize

    6.9MB

  • memory/2324-3-0x0000000000420000-0x0000000000444000-memory.dmp

    Filesize

    144KB

  • memory/2324-4-0x000000007461E000-0x000000007461F000-memory.dmp

    Filesize

    4KB

  • memory/2324-5-0x0000000074610000-0x0000000074CFE000-memory.dmp

    Filesize

    6.9MB

  • memory/2324-6-0x00000000004A0000-0x00000000004AC000-memory.dmp

    Filesize

    48KB

  • memory/2324-29-0x0000000074610000-0x0000000074CFE000-memory.dmp

    Filesize

    6.9MB

  • memory/2324-0-0x000000007461E000-0x000000007461F000-memory.dmp

    Filesize

    4KB

  • memory/2792-16-0x0000000000400000-0x0000000000412000-memory.dmp

    Filesize

    72KB

  • memory/2792-25-0x0000000000400000-0x0000000000412000-memory.dmp

    Filesize

    72KB

  • memory/2792-26-0x0000000000400000-0x0000000000412000-memory.dmp

    Filesize

    72KB

  • memory/2792-28-0x0000000000400000-0x0000000000412000-memory.dmp

    Filesize

    72KB

  • memory/2792-24-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

    Filesize

    4KB

  • memory/2792-20-0x0000000000400000-0x0000000000412000-memory.dmp

    Filesize

    72KB

  • memory/2792-22-0x0000000000400000-0x0000000000412000-memory.dmp

    Filesize

    72KB

  • memory/2792-18-0x0000000000400000-0x0000000000412000-memory.dmp

    Filesize

    72KB