Analysis

  • max time kernel
    150s
  • max time network
    152s
  • platform
    windows7_x64
  • resource
    win7v20210410
  • submitted
    24/05/2021, 10:31

General

  • Target
    d3e8bacfa3a35f43a26772be547d48a9.exe
  • Size 14.1MB
  • Sample210524-qppzed5a8a
  • SHA256 7b579694a738437eb6aed2064bd2d78cb77d8afe92994bf6e02016a563cd50a3
  • MD5 SHA1 SHA512
Score
10/10

Malware Config

Extracted

Family
  • asyncrat

Version
  • 0.5.7B

C2
  • 81.163.246.9:5020

Mutex
  • AsyncMutex_6SI8OkPnk

Attributes
  • aes_key

    H3XOkf5xclZtUY6prd4SD8X3oarIoAqU

  • anti_detection

    true

  • autorun

    false

  • bdos

    true

  • delay

    Default

  • host

    81.163.246.9

  • hwid

    3

  • install_file

  • install_folder

    %AppData%

  • mutex

    AsyncMutex_6SI8OkPnk

  • pastebin_config

    null

  • port

    5020

  • version

    0.5.7B

aes.plain

Signatures

  • AsyncRat

    AsyncRAT is designed to remotely monitor and control other computers.

  • xmrig

    XMRig is a high performance, open source, cross platform CPU/GPU miner.

  • Async RAT payload 6 IoCs
  • Detected Stratum cryptominer command

    Looks to be attempting to contact Stratum mining pool.

  • XMRig Miner Payload 13 IoCs
  • Executes dropped EXE 13 IoCs
  • Loads dropped DLL 23 IoCs
  • Suspicious use of SetThreadContext 13 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Creates scheduled task(s) 1 TTPs 1 IoCs

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

  • Modifies system certificate store 2 TTPs 2 IoCs
  • NTFS ADS 1 IoCs
  • Script User-Agent 1 IoCs

    Uses user-agent string associated with script host/environment.

  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious use of AdjustPrivilegeToken 36 IoCs
  • Suspicious use of FindShellTrayWindow 18 IoCs
  • Suspicious use of SendNotifyMessage 18 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs
  • Views/modifies file attributes 1 TTPs 18 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\d3e8bacfa3a35f43a26772be547d48a9.exe
    "C:\Users\Admin\AppData\Local\Temp\d3e8bacfa3a35f43a26772be547d48a9.exe"
    1⤵
    • Loads dropped DLL
    • Suspicious use of WriteProcessMemory
    PID:540
    • C:\Users\Admin\AppData\Local\Temp\RarSFX0\Cript.exe
      "C:\Users\Admin\AppData\Local\Temp\RarSFX0\Cript.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of WriteProcessMemory
      PID:2016
      • C:\Windows\SysWOW64\WScript.exe
        "C:\Windows\System32\WScript.exe" "C:\Driverdll\ssbT9GVu.vbe"
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:1448
        • C:\Windows\SysWOW64\cmd.exe
          cmd /c ""C:\Driverdll\jZWXmLWSCTcFHfd1q.bat" "
          4⤵
            PID:944
      • C:\Users\Admin\AppData\Local\Temp\RarSFX0\WinRaR64.exe
        "C:\Users\Admin\AppData\Local\Temp\RarSFX0\WinRaR64.exe"
        2⤵
        • Executes dropped EXE
        • Loads dropped DLL
        • Modifies system certificate store
        • NTFS ADS
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of FindShellTrayWindow
        • Suspicious use of SendNotifyMessage
        • Suspicious use of WriteProcessMemory
        PID:1064
        • C:\Users\Admin\AppData\Local\Temp\CL_Debug_Log.txt
          C:\Users\Admin\AppData\Local\Temp\CL_Debug_Log.txt e -p"JDQJndnqwdnqw2139dn21n3b312idDQDB" "C:\Users\Admin\AppData\Local\Temp\CR_Debug_Log.txt" -o"C:\Users\Admin\AppData\Local\Temp\"
          3⤵
          • Executes dropped EXE
          • Suspicious use of AdjustPrivilegeToken
          PID:1496
        • C:\Windows\SysWOW64\cmd.exe
          C:\Windows\system32\cmd.exe /c schtasks.exe /Create /XML "C:\Users\Admin\AppData\Local\Temp\SystemCheck.xml" /TN "System\SystemCheck"
          3⤵
          • Suspicious use of WriteProcessMemory
          PID:240
          • C:\Windows\SysWOW64\schtasks.exe
            schtasks.exe /Create /XML "C:\Users\Admin\AppData\Local\Temp\SystemCheck.xml" /TN "System\SystemCheck"
            4⤵
            • Creates scheduled task(s)
            PID:736
      • C:\Users\Admin\AppData\Local\Temp\RarSFX0\Async.exe
        "C:\Users\Admin\AppData\Local\Temp\RarSFX0\Async.exe"
        2⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        PID:1852
    • C:\Windows\system32\taskeng.exe
      taskeng.exe {60742E86-5D42-41EF-BC47-9F824027695F} S-1-5-21-2513283230-931923277-594887482-1000:MRBKYMNO\Admin:Interactive:[1]
      1⤵
      • Suspicious use of WriteProcessMemory
      PID:1812
      • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Helper.exe
        C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Helper.exe -SystemCheck
        2⤵
        • Executes dropped EXE
        • Loads dropped DLL
        • Suspicious use of SetThreadContext
        • Suspicious use of FindShellTrayWindow
        • Suspicious use of SendNotifyMessage
        • Suspicious use of WriteProcessMemory
        PID:1576
        • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Helper.exe
          7z e -p"DxSqsNKKOxqPrM4Y3xeK" "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Tor.tmp" -o"C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Tor\"
          3⤵
          • Executes dropped EXE
          • Suspicious use of AdjustPrivilegeToken
          PID:1188
        • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Tor\tor.exe
          "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Tor\tor.exe" -f TorConfig
          3⤵
          • Executes dropped EXE
          • Loads dropped DLL
          PID:860
        • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Helper.exe
          7z e -p"DxSqsNKKOxqPrM4Y3xeK" "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\SysBackup.tmp" -o"C:\Users\Admin\AppData\Roaming\Microsoft\Windows\"
          3⤵
          • Executes dropped EXE
          • Suspicious use of AdjustPrivilegeToken
          PID:1448
        • C:\Windows\SysWOW64\attrib.exe
          -o stratum+tcp://rutracker.host:3333 -u -p x -t 2
          3⤵
          • Suspicious use of AdjustPrivilegeToken
          • Views/modifies file attributes
          PID:748
        • C:\Windows\SysWOW64\attrib.exe
          -o stratum+tcp://rutracker.host:3333 -u -p x -t 2
          3⤵
          • Views/modifies file attributes
          PID:1920
        • C:\Windows\SysWOW64\attrib.exe
          -o stratum+tcp://rutracker.host:3333 -u -p x -t 2
          3⤵
          • Suspicious use of AdjustPrivilegeToken
          • Views/modifies file attributes
          PID:768
        • C:\Windows\SysWOW64\attrib.exe
          -o stratum+tcp://rutracker.host:3333 -u -p x -t 2
          3⤵
          • Suspicious use of AdjustPrivilegeToken
          • Views/modifies file attributes
          PID:1760
        • C:\Windows\SysWOW64\attrib.exe
          -o stratum+tcp://rutracker.host:3333 -u -p x -t 2
          3⤵
          • Views/modifies file attributes
          PID:944
        • C:\Windows\SysWOW64\attrib.exe
          -o stratum+tcp://rutracker.host:3333 -u -p x -t 2
          3⤵
          • Suspicious use of AdjustPrivilegeToken
          • Views/modifies file attributes
          PID:2004
        • C:\Windows\SysWOW64\attrib.exe
          -o stratum+tcp://rutracker.host:3333 -u -p x -t 2
          3⤵
          • Views/modifies file attributes
          PID:1772
        • C:\Windows\SysWOW64\attrib.exe
          -o stratum+tcp://rutracker.host:3333 -u -p x -t 2
          3⤵
          • Views/modifies file attributes
          PID:572
        • C:\Windows\SysWOW64\attrib.exe
          -o stratum+tcp://rutracker.host:3333 -u -p x -t 2
          3⤵
          • Suspicious use of AdjustPrivilegeToken
          • Views/modifies file attributes
          PID:1448
        • C:\Windows\SysWOW64\attrib.exe
          -o stratum+tcp://rutracker.host:3333 -u -p x -t 2
          3⤵
          • Suspicious use of AdjustPrivilegeToken
          • Views/modifies file attributes
          PID:1060
        • C:\Windows\SysWOW64\attrib.exe
          -o stratum+tcp://rutracker.host:3333 -u -p x -t 2
          3⤵
          • Suspicious use of AdjustPrivilegeToken
          • Views/modifies file attributes
          PID:1928
        • C:\Windows\SysWOW64\attrib.exe
          -o stratum+tcp://rutracker.host:3333 -u -p x -t 2
          3⤵
          • Views/modifies file attributes
          PID:1856
        • C:\Windows\SysWOW64\attrib.exe
          -o stratum+tcp://rutracker.host:3333 -u -p x -t 2
          3⤵
          • Suspicious use of AdjustPrivilegeToken
          • Views/modifies file attributes
          PID:296
        • C:\Windows\SysWOW64\attrib.exe
          -o stratum+tcp://rutracker.host:3333 -u -p x -t 2
          3⤵
          • Views/modifies file attributes
          PID:1760
        • C:\Windows\SysWOW64\attrib.exe
          -o stratum+tcp://rutracker.host:3333 -u -p x -t 2
          3⤵
          • Suspicious use of AdjustPrivilegeToken
          • Views/modifies file attributes
          PID:2024
        • C:\Windows\SysWOW64\attrib.exe
          -o stratum+tcp://rutracker.host:3333 -u -p x -t 2
          3⤵
          • Suspicious use of AdjustPrivilegeToken
          • Views/modifies file attributes
          PID:1608
        • C:\Windows\SysWOW64\attrib.exe
          -o stratum+tcp://rutracker.host:3333 -u -p x -t 2
          3⤵
          • Suspicious use of AdjustPrivilegeToken
          • Views/modifies file attributes
          PID:1144
        • C:\Windows\SysWOW64\attrib.exe
          -o stratum+tcp://rutracker.host:3333 -u -p x -t 2
          3⤵
          • Views/modifies file attributes
          PID:328
      • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Helper.exe
        C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Helper.exe -SystemCheck
        2⤵
        • Executes dropped EXE
        PID:1732
      • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Helper.exe
        C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Helper.exe -SystemCheck
        2⤵
        • Executes dropped EXE
        • Suspicious use of FindShellTrayWindow
        • Suspicious use of SendNotifyMessage
        PID:1496
      • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Helper.exe
        C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Helper.exe -SystemCheck
        2⤵
        • Executes dropped EXE
        • Suspicious use of FindShellTrayWindow
        • Suspicious use of SendNotifyMessage
        PID:328
      • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Helper.exe
        C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Helper.exe -SystemCheck
        2⤵
        • Executes dropped EXE
        • Suspicious use of FindShellTrayWindow
        • Suspicious use of SendNotifyMessage
        PID:940
      • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Helper.exe
        C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Helper.exe -SystemCheck
        2⤵
        • Executes dropped EXE
        • Suspicious use of FindShellTrayWindow
        • Suspicious use of SendNotifyMessage
        PID:1636

    Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

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          Downloads

          memory/540-59-0x0000000075A71000-0x0000000075A73000-memory.dmp

          memory/748-172-0x0000000000400000-0x0000000000C0B000-memory.dmp

          memory/748-169-0x0000000000400000-0x0000000000C0B000-memory.dmp

          memory/860-139-0x000000006EA00000-0x000000006EAA7000-memory.dmp

          memory/860-145-0x0000000000CA0000-0x0000000001048000-memory.dmp

          memory/860-142-0x000000006EEF0000-0x000000006EFAD000-memory.dmp

          memory/860-141-0x000000006F000000-0x000000006F021000-memory.dmp

          memory/860-140-0x0000000000CA0000-0x0000000001048000-memory.dmp

          memory/860-143-0x000000006EAB0000-0x000000006ECBB000-memory.dmp

          memory/860-138-0x000000006EAB0000-0x000000006ECBB000-memory.dmp

          memory/860-137-0x000000006EEF0000-0x000000006EFAD000-memory.dmp

          memory/860-136-0x000000006F000000-0x000000006F021000-memory.dmp

          memory/860-144-0x000000006EA00000-0x000000006EAA7000-memory.dmp

          memory/1064-87-0x0000000001000000-0x0000000001001000-memory.dmp

          memory/1188-109-0x00000000004D0000-0x0000000000590000-memory.dmp

          memory/1188-113-0x00000000004D0000-0x0000000000590000-memory.dmp

          memory/1448-155-0x0000000000080000-0x0000000000140000-memory.dmp

          memory/1448-159-0x0000000000080000-0x0000000000140000-memory.dmp

          memory/1852-98-0x00000000009F0000-0x00000000009F1000-memory.dmp

          memory/1852-101-0x0000000000750000-0x0000000000751000-memory.dmp