Analysis

  • max time kernel
    122s
  • max time network
    125s
  • platform
    windows7_x64
  • resource
    win7-20240220-en
  • resource tags

    arch:x64arch:x86image:win7-20240220-enlocale:en-usos:windows7-x64system
  • submitted
    29/04/2024, 01:02

General

  • Target
    Reaper/Reaper.exe
  • Size 8.4MB
  • Sample240429-bd8spadh8y
  • SHA256 a8e3cbf1921a2485a307ac0ff2536accc77bc17db386a00e8d67c5537613b321
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • xworm

C2
  • l838.ddns.net:3232

Attributes
  • Install_directory

    %Public%

  • install_file

    Windows Service Wrapper.exe

Extracted

Family
  • asyncrat

Version
  • L838 RAT v1.0.0

Botnet
  • Default

C2
  • 127.0.0.1:54984

  • 127.0.0.1:4449

  • l838.ddns.net:54984

  • l838.ddns.net:4449

Mutex
  • azjrpxchkiev

Attributes
  • delay

    1

  • install

    true

  • install_file

    Windows Driver Foundation.exe

  • install_folder

    %Temp%

aes.plain

Signatures

  • AsyncRat

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

  • Detect Xworm Payload 2 IoCs
  • Xworm

    Xworm is a remote access trojan written in C#.

  • Async RAT payload 1 IoCs
  • Drops startup file 2 IoCs
  • Executes dropped EXE 6 IoCs
  • Loads dropped DLL 14 IoCs
  • UPX packed file 2 IoCs

    Detects executables packed with UPX/modified UPX open source packer.

  • Adds Run key to start application 2 TTPs 1 IoCs
  • Looks up external IP address via web service 1 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Enumerates physical storage devices 1 TTPs

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

  • Creates scheduled task(s) 1 TTPs 1 IoCs

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

  • Suspicious behavior: AddClipboardFormatListener 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 5 IoCs
  • Suspicious use of AdjustPrivilegeToken 48 IoCs
  • Suspicious use of WriteProcessMemory 38 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\Reaper\Reaper.exe
    "C:\Users\Admin\AppData\Local\Temp\Reaper\Reaper.exe"
    1⤵
    • Loads dropped DLL
    • Suspicious use of WriteProcessMemory
    PID:2728
    • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -EncodedCommand "PAAjAHQAbgBtACMAPgBBAGQAZAAtAE0AcABQAHIAZQBmAGUAcgBlAG4AYwBlACAAPAAjAHIAdgBsACMAPgAgAC0ARQB4AGMAbAB1AHMAaQBvAG4AUABhAHQAaAAgAEAAKAAkAGUAbgB2ADoAVQBzAGUAcgBQAHIAbwBmAGkAbABlACwAJABlAG4AdgA6AFMAeQBzAHQAZQBtAEQAcgBpAHYAZQApACAAPAAjAHoAagBuACMAPgAgAC0ARgBvAHIAYwBlACAAPAAjAGYAYwBlACMAPgA="
      2⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:2952
    • C:\Users\Admin\AppData\Local\Temp\Reaper.exe
      "C:\Users\Admin\AppData\Local\Temp\Reaper.exe"
      2⤵
      • Executes dropped EXE
      • Loads dropped DLL
      PID:2504
    • C:\Users\Admin\Windows Driver Foundation.exe
      "C:\Users\Admin\Windows Driver Foundation.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      PID:2592
    • C:\Users\Admin\Windows Service Wrapper.exe
      "C:\Users\Admin\Windows Service Wrapper.exe"
      2⤵
      • Drops startup file
      • Executes dropped EXE
      • Adds Run key to start application
      • Suspicious behavior: AddClipboardFormatListener
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:2820
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\Windows Service Wrapper.exe'
        3⤵
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:2196
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'Windows Service Wrapper.exe'
        3⤵
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:716
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Public\Windows Service Wrapper.exe'
        3⤵
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:2768
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'Windows Service Wrapper.exe'
        3⤵
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:836
      • C:\Windows\System32\schtasks.exe
        "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "Windows Service Wrapper" /tr "C:\Users\Public\Windows Service Wrapper.exe"
        3⤵
        • Creates scheduled task(s)
        PID:1216
    • C:\Users\Admin\Windows SmartScreen.exe
      "C:\Users\Admin\Windows SmartScreen.exe"
      2⤵
      • Executes dropped EXE
      • Loads dropped DLL
      • Suspicious use of WriteProcessMemory
      PID:2572
      • C:\Users\Admin\Windows SmartScreen.exe
        "C:\Users\Admin\Windows SmartScreen.exe"
        3⤵
        • Executes dropped EXE
        • Loads dropped DLL
        PID:1560
  • C:\Windows\system32\taskeng.exe
    taskeng.exe {9299D797-9DF6-4362-8B4B-4C38B7F159B5} S-1-5-21-2721934792-624042501-2768869379-1000:BISMIZHX\Admin:Interactive:[1]
    1⤵
      PID:2152

    Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

          FastColoredTextBox.dll

          • Path C:\Users\Admin\AppData\Local\Temp\FastColoredTextBox.dll
          • Size 323KB
          • SHA256 ac926c92ccfc3789a5ae571cc4415eb1897d500a79604d8495241c19acdf01b9
          • MD5 SHA1 SHA512 SSDEEP

          Reaper.exe

          • Path C:\Users\Admin\AppData\Local\Temp\Reaper.exe
          • Size 42KB
          • SHA256 fc69c7aee21fa012c9e9de28e35c20eb9ddf473c0ac0b482faebc203dd97999c
          • MD5 SHA1 SHA512 SSDEEP

          api-ms-win-core-file-l2-1-0.dll

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI25722\api-ms-win-core-file-l2-1-0.dll
          • Size 22KB
          • SHA256 67fd0522cacfc3f5fb90373dd5fb388b6f63035d9a380cac4a3dd3d7801724ed
          • MD5 SHA1 SHA512 SSDEEP

          api-ms-win-core-localization-l1-2-0.dll

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI25722\api-ms-win-core-localization-l1-2-0.dll
          • Size 22KB
          • SHA256 3cbc6f8cc2a014c9c6e87ca05dd0e9e0884da58afdc53b589b3d7172c4403ed7
          • MD5 SHA1 SHA512 SSDEEP

          api-ms-win-core-processthreads-l1-1-1.dll

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI25722\api-ms-win-core-processthreads-l1-1-1.dll
          • Size 22KB
          • SHA256 a5aa6755860602c58c0edb1353c965e6f0ba58e7276ba6fb5a0b961fb274d125
          • MD5 SHA1 SHA512 SSDEEP

          api-ms-win-core-timezone-l1-1-0.dll

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI25722\api-ms-win-core-timezone-l1-1-0.dll
          • Size 22KB
          • SHA256 c67dd8ed74c0a207c980caa6bb453e62180a71af175feeb42c2c926ecb911e0a
          • MD5 SHA1 SHA512 SSDEEP

          python311.dll

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI25722\python311.dll
          • Size 1.6MB
          • SHA256 7e1370058177d78a415b7ed113cc15472974440d84267fc44cdc5729535e3967
          • MD5 SHA1 SHA512 SSDEEP

          ucrtbase.dll

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI25722\ucrtbase.dll
          • Size 1.1MB
          • SHA256 ed570898508c9d9186052157106b6dd9722bed47a27ecfeb424386c8970d81da
          • MD5 SHA1 SHA512 SSDEEP

          P6D0B47A9LZLEX4CE9DT.temp

          • Path C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\P6D0B47A9LZLEX4CE9DT.temp
          • Size 7KB
          • SHA256 89f0720d48354e945aba9fe6e8bd9f45344d627fc8ba65df9a6f7a0d819d2af6
          • MD5 SHA1 SHA512 SSDEEP

          Windows Driver Foundation.exe

          • Path C:\Users\Admin\Windows Driver Foundation.exe
          • Size 74KB
          • SHA256 c98143abbb039d75adadefe62be076f46158aa0940bc65aafacfd6f820e35f50
          • MD5 SHA1 SHA512 SSDEEP

          Windows Service Wrapper.exe

          • Path C:\Users\Admin\Windows Service Wrapper.exe
          • Size 63KB
          • SHA256 d5bad2e5f00b8222e1ac18fdf3de1a2341e0c9aa6744c193cc559c3e8e9d918b
          • MD5 SHA1 SHA512 SSDEEP

          api-ms-win-core-file-l1-2-0.dll

          • Path \Users\Admin\AppData\Local\Temp\_MEI25722\api-ms-win-core-file-l1-2-0.dll
          • Size 22KB
          • SHA256 0b7a730b6b10c9d2e2fe1b9b4419b1fc60db9074a0c6f830e1b2da4d0f65fe88
          • MD5 SHA1 SHA512 SSDEEP

          Windows SmartScreen.exe

          • Path \Users\Admin\Windows SmartScreen.exe
          • Size 7.9MB
          • SHA256 c728d0df78c2c46946c59843bd7154a4d43deb859d52356bc3f204e8b59fee59
          • MD5 SHA1 SHA512 SSDEEP

          memory/716-126-0x000000001B520000-0x000000001B802000-memory.dmp

          memory/716-127-0x00000000021A0000-0x00000000021A8000-memory.dmp

          memory/1560-113-0x000007FEED860000-0x000007FEEDE49000-memory.dmp

          memory/2196-119-0x000000001B740000-0x000000001BA22000-memory.dmp

          memory/2196-120-0x0000000001DA0000-0x0000000001DA8000-memory.dmp

          memory/2504-112-0x00000000004D0000-0x0000000000528000-memory.dmp

          memory/2504-24-0x0000000000260000-0x0000000000270000-memory.dmp

          memory/2592-26-0x00000000012C0000-0x00000000012D8000-memory.dmp

          memory/2820-25-0x0000000000BD0000-0x0000000000BE6000-memory.dmp