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Analysis

  • max time kernel
    150s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240226-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
  • submitted
    28/02/2024, 12:03

General

  • Target

    abd5bc4c0ae51f1cbff6215bd4c7db1b.exe

  • Size

    11.5MB

  • MD5

    abd5bc4c0ae51f1cbff6215bd4c7db1b

  • SHA1

    78f1c2d2696d42c971f7aac2a5a9e4054ff156c3

  • SHA256

    1034116ab8df2f195badd17f38b4628e3ba7251dcd2e62d7dd34bc2c2791eb82

  • SHA512

    7fbfbeb41c05b7c688b2ca4f9eda3bc6f5a6021f4024c67a647b88c3bbdfec258a3d81540ef951f938689b4aa10e75c697a4533014cd34ddf2426aa7a9949b40

  • SSDEEP

    196608:nrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrL:

Malware Config

Extracted

Family

tofsee

C2

43.231.4.6

lazystax.ru

Signatures

  • Tofsee

    Backdoor/botnet which carries out malicious activities based on commands from a C2 server.

  • Creates new service(s) 1 TTPs
  • Modifies Windows Firewall 2 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.

  • Deletes itself 1 IoCs
  • Executes dropped EXE 1 IoCs
  • Suspicious use of SetThreadContext 1 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).

  • Program crash 2 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\abd5bc4c0ae51f1cbff6215bd4c7db1b.exe
    "C:\Users\Admin\AppData\Local\Temp\abd5bc4c0ae51f1cbff6215bd4c7db1b.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:3404
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\cxntiqvx\
      2⤵
        PID:2196
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\sbqlxwdn.exe" C:\Windows\SysWOW64\cxntiqvx\
        2⤵
          PID:2620
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create cxntiqvx binPath= "C:\Windows\SysWOW64\cxntiqvx\sbqlxwdn.exe /d\"C:\Users\Admin\AppData\Local\Temp\abd5bc4c0ae51f1cbff6215bd4c7db1b.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2236
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description cxntiqvx "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1812
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start cxntiqvx
          2⤵
          • Launches sc.exe
          PID:5072
        • 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:2376
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3404 -s 1164
          2⤵
          • Program crash
          PID:624
      • C:\Windows\SysWOW64\cxntiqvx\sbqlxwdn.exe
        C:\Windows\SysWOW64\cxntiqvx\sbqlxwdn.exe /d"C:\Users\Admin\AppData\Local\Temp\abd5bc4c0ae51f1cbff6215bd4c7db1b.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1332
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Deletes itself
          PID:3696
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1332 -s 512
          2⤵
          • Program crash
          PID:4276
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 464 -p 3404 -ip 3404
        1⤵
          PID:2736
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 524 -p 1332 -ip 1332
          1⤵
            PID:4316

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

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          Downloads

          • C:\Users\Admin\AppData\Local\Temp\sbqlxwdn.exe

            Filesize

            12.9MB

            MD5

            4f45cce1553a3b7f0515bd989c054d24

            SHA1

            a8df74b9218409bcfe334aab1a012f0caf71c2be

            SHA256

            248ae626a6eeda354433502a542ed8de0cb179ff255535ecbf6d319d0def9c1a

            SHA512

            a9af7a25a731172b46d8521d3960d5dd7294bf3e49d2d1ade56c7dcf4dd4546b18d67ff25e50b651722c989526237971bce2b50c61b1a1c6de2777182640c54d

          • memory/1332-10-0x0000000000B40000-0x0000000000C40000-memory.dmp

            Filesize

            1024KB

          • memory/1332-13-0x0000000000400000-0x00000000008EB000-memory.dmp

            Filesize

            4.9MB

          • memory/3404-4-0x0000000000400000-0x00000000008EB000-memory.dmp

            Filesize

            4.9MB

          • memory/3404-2-0x0000000000B90000-0x0000000000BA3000-memory.dmp

            Filesize

            76KB

          • memory/3404-7-0x0000000000400000-0x00000000008EB000-memory.dmp

            Filesize

            4.9MB

          • memory/3404-8-0x0000000000B90000-0x0000000000BA3000-memory.dmp

            Filesize

            76KB

          • memory/3404-1-0x0000000000BD0000-0x0000000000CD0000-memory.dmp

            Filesize

            1024KB

          • memory/3696-11-0x00000000003A0000-0x00000000003B5000-memory.dmp

            Filesize

            84KB

          • memory/3696-15-0x00000000003A0000-0x00000000003B5000-memory.dmp

            Filesize

            84KB

          • memory/3696-16-0x00000000003A0000-0x00000000003B5000-memory.dmp

            Filesize

            84KB

          • memory/3696-17-0x00000000003A0000-0x00000000003B5000-memory.dmp

            Filesize

            84KB

          • memory/3696-19-0x00000000003A0000-0x00000000003B5000-memory.dmp

            Filesize

            84KB