Analysis

  • max time kernel
    147s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220901-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220901-enlocale:en-usos:windows10-2004-x64system
  • submitted
    19/12/2022, 12:24

General

  • Target
    file.exe
  • Size 312KB
  • Sample221219-pk2jvaaa41
  • SHA256 d6fa8a656a9cd603dafc40a4c7dcc9e0e52f4a6fffd722dae1030f9556a5da18
  • 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 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:1828
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\bhweukmu\
      2⤵
        PID:528
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ponopzbe.exe" C:\Windows\SysWOW64\bhweukmu\
        2⤵
          PID:2276
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create bhweukmu binPath= "C:\Windows\SysWOW64\bhweukmu\ponopzbe.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3064
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description bhweukmu "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3112
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start bhweukmu
          2⤵
          • Launches sc.exe
          PID:1812
        • 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:4080
      • C:\Windows\SysWOW64\bhweukmu\ponopzbe.exe
        C:\Windows\SysWOW64\bhweukmu\ponopzbe.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:5108
        • 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:3832
          • 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:3804

      Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

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            Downloads

            ponopzbe.exe

            • Path C:\Users\Admin\AppData\Local\Temp\ponopzbe.exe
            • Size 10.4MB
            • SHA256 05741d9e70e6e89917513fd62012ddc0b1ae27fae580684ab4cb340680642210
            • MD5 SHA1 SHA512 SSDEEP

            ponopzbe.exe

            • Path C:\Windows\SysWOW64\bhweukmu\ponopzbe.exe
            • Size 10.4MB
            • SHA256 05741d9e70e6e89917513fd62012ddc0b1ae27fae580684ab4cb340680642210
            • MD5 SHA1 SHA512 SSDEEP

            memory/1828-134-0x0000000000400000-0x0000000000453000-memory.dmp

            memory/1828-133-0x00000000021A0000-0x00000000021B3000-memory.dmp

            memory/1828-143-0x0000000000489000-0x000000000049E000-memory.dmp

            memory/1828-144-0x0000000000400000-0x0000000000453000-memory.dmp

            memory/1828-132-0x0000000000489000-0x000000000049E000-memory.dmp

            memory/3804-178-0x0000000001200000-0x00000000012F1000-memory.dmp

            memory/3804-173-0x0000000001200000-0x00000000012F1000-memory.dmp

            memory/3832-146-0x0000000000D40000-0x0000000000D55000-memory.dmp

            memory/3832-169-0x00000000023F0000-0x00000000023F7000-memory.dmp

            memory/3832-151-0x0000000000D40000-0x0000000000D55000-memory.dmp

            memory/3832-166-0x0000000007B00000-0x0000000007F0B000-memory.dmp

            memory/3832-154-0x0000000002C00000-0x0000000002E0F000-memory.dmp

            memory/3832-157-0x0000000000FE0000-0x0000000000FE6000-memory.dmp

            memory/3832-160-0x0000000000FF0000-0x0000000001000000-memory.dmp

            memory/3832-163-0x00000000023E0000-0x00000000023E5000-memory.dmp

            memory/5108-153-0x0000000000400000-0x0000000000453000-memory.dmp

            memory/5108-150-0x0000000000400000-0x0000000000453000-memory.dmp

            memory/5108-149-0x0000000000685000-0x000000000069A000-memory.dmp

            memory/5108-152-0x0000000000685000-0x000000000069A000-memory.dmp

            memory/5108-179-0x0000000000400000-0x0000000000453000-memory.dmp