Analysis

  • max time kernel
    144s
  • max time network
    148s
  • platform
    windows7_x64
  • resource
    win7-20221111-en
  • resource tags

    arch:x64arch:x86image:win7-20221111-enlocale:en-usos:windows7-x64system
  • submitted
    18/12/2022, 08:20

General

  • Target
    file.exe
  • Size 215KB
  • Sample221218-j8fdmaea5t
  • SHA256 b71d20e4a1e5802a036f25430a6a77fbf9d30fdc193f0ea8fab29dbda81652ee
  • 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.

  • Windows security bypass 2 TTPs 1 IoCs
  • 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
  • Deletes itself 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.

  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 36 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:1204
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\wumctbft\
      2⤵
        PID:952
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\jdfnjdjc.exe" C:\Windows\SysWOW64\wumctbft\
        2⤵
          PID:1108
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create wumctbft binPath= "C:\Windows\SysWOW64\wumctbft\jdfnjdjc.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:652
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description wumctbft "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:552
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start wumctbft
          2⤵
          • Launches sc.exe
          PID:876
        • 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:1304
      • C:\Windows\SysWOW64\wumctbft\jdfnjdjc.exe
        C:\Windows\SysWOW64\wumctbft\jdfnjdjc.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2000
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Windows security bypass
          • Sets service image path in registry
          • Deletes itself
          • Drops file in System32 directory
          • Suspicious use of SetThreadContext
          • Modifies data under HKEY_USERS
          • Suspicious use of WriteProcessMemory
          PID:1572
          • 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:1308

      Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

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            Downloads

            jdfnjdjc.exe

            • Path C:\Users\Admin\AppData\Local\Temp\jdfnjdjc.exe
            • Size 12.2MB
            • SHA256 f5835b0c3c504d8409e4224584fc7ec2e6e94ada6907a929495a0b960a238d8f
            • MD5 SHA1 SHA512 SSDEEP

            jdfnjdjc.exe

            • Path C:\Windows\SysWOW64\wumctbft\jdfnjdjc.exe
            • Size 12.2MB
            • SHA256 f5835b0c3c504d8409e4224584fc7ec2e6e94ada6907a929495a0b960a238d8f
            • MD5 SHA1 SHA512 SSDEEP

            memory/1204-58-0x00000000001B0000-0x00000000001C3000-memory.dmp

            memory/1204-57-0x00000000002C8000-0x00000000002D9000-memory.dmp

            memory/1204-59-0x0000000000400000-0x0000000000460000-memory.dmp

            memory/1204-55-0x0000000076391000-0x0000000076393000-memory.dmp

            memory/1204-68-0x00000000002C8000-0x00000000002D9000-memory.dmp

            memory/1204-69-0x0000000000400000-0x0000000000460000-memory.dmp

            memory/1204-54-0x00000000002C8000-0x00000000002D9000-memory.dmp

            memory/1308-101-0x00000000002C0000-0x00000000003B1000-memory.dmp

            memory/1308-103-0x00000000002C0000-0x00000000003B1000-memory.dmp

            memory/1572-72-0x00000000000C0000-0x00000000000D5000-memory.dmp

            memory/1572-91-0x00000000002F0000-0x00000000002F5000-memory.dmp

            memory/1572-74-0x00000000000C0000-0x00000000000D5000-memory.dmp

            memory/1572-81-0x00000000000C0000-0x00000000000D5000-memory.dmp

            memory/1572-82-0x0000000001950000-0x0000000001B5F000-memory.dmp

            memory/1572-85-0x0000000000160000-0x0000000000166000-memory.dmp

            memory/1572-88-0x00000000001F0000-0x0000000000200000-memory.dmp

            memory/1572-94-0x0000000005870000-0x0000000005C7B000-memory.dmp

            memory/1572-97-0x0000000000500000-0x0000000000507000-memory.dmp

            memory/1572-100-0x00000000000C0000-0x00000000000D5000-memory.dmp

            memory/2000-79-0x00000000005B8000-0x00000000005C9000-memory.dmp

            memory/2000-80-0x0000000000400000-0x0000000000460000-memory.dmp

            memory/2000-66-0x00000000005B8000-0x00000000005C9000-memory.dmp