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Analysis

  • max time kernel
    146s
  • max time network
    127s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240226-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
  • submitted
    04/03/2024, 14:11

General

  • Target

    b253f5b8d1f9aad76587136d065831e2.exe

  • Size

    13.6MB

  • MD5

    b253f5b8d1f9aad76587136d065831e2

  • SHA1

    1b52e954d04c96a82e24f74ed38ab1136cdec4f6

  • SHA256

    789e9198d141f39bf030563420328dab4477ac3d60cc87244c6aac684f0aac5e

  • SHA512

    1ab9b1c968ab3ff32b9e8e19d1bd7d6cd1d19ae601ea86cf20eab684036c0b7a0464f45e36a46468c4684f84eb61217520ee14be862a72e5c075e4751c12a4c3

  • SSDEEP

    98304:cvjOF//////////////////////////////////////////////////////////H:m

Malware Config

Extracted

Family

tofsee

C2

43.231.4.7

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\b253f5b8d1f9aad76587136d065831e2.exe
    "C:\Users\Admin\AppData\Local\Temp\b253f5b8d1f9aad76587136d065831e2.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:5076
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\uvcbvgzm\
      2⤵
        PID:3520
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\miaaxmlz.exe" C:\Windows\SysWOW64\uvcbvgzm\
        2⤵
          PID:3424
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create uvcbvgzm binPath= "C:\Windows\SysWOW64\uvcbvgzm\miaaxmlz.exe /d\"C:\Users\Admin\AppData\Local\Temp\b253f5b8d1f9aad76587136d065831e2.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1160
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description uvcbvgzm "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4732
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start uvcbvgzm
          2⤵
          • Launches sc.exe
          PID:3848
        • 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:1176
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 5076 -s 1244
          2⤵
          • Program crash
          PID:2340
      • C:\Windows\SysWOW64\uvcbvgzm\miaaxmlz.exe
        C:\Windows\SysWOW64\uvcbvgzm\miaaxmlz.exe /d"C:\Users\Admin\AppData\Local\Temp\b253f5b8d1f9aad76587136d065831e2.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3308
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Deletes itself
          PID:3916
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3308 -s 516
          2⤵
          • Program crash
          PID:2784
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 488 -p 5076 -ip 5076
        1⤵
          PID:1152
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 480 -p 3308 -ip 3308
          1⤵
            PID:1500

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

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          Downloads

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

            Filesize

            14.1MB

            MD5

            bbbab794e10313a6e8fdd4a7079cf889

            SHA1

            07313b2742adb8b372883762c1014a08f57aae12

            SHA256

            b6e5728748a87de415fc315d59f59db3eab5b5027286a342c7528558765495f9

            SHA512

            f9f214c1efd2fc1b9bf38ed034f2dc65f066dc355d587e16cfd71db0f931837a808973a13d87163dafd65c6312efef555bdbd6e478a3727553f4cd14591974f0

          • memory/3308-13-0x0000000000400000-0x0000000000C1F000-memory.dmp

            Filesize

            8.1MB

          • memory/3308-10-0x0000000000E10000-0x0000000000F10000-memory.dmp

            Filesize

            1024KB

          • memory/3916-11-0x00000000010E0000-0x00000000010F5000-memory.dmp

            Filesize

            84KB

          • memory/3916-15-0x00000000010E0000-0x00000000010F5000-memory.dmp

            Filesize

            84KB

          • memory/3916-16-0x00000000010E0000-0x00000000010F5000-memory.dmp

            Filesize

            84KB

          • memory/3916-18-0x00000000010E0000-0x00000000010F5000-memory.dmp

            Filesize

            84KB

          • memory/5076-1-0x0000000000D60000-0x0000000000E60000-memory.dmp

            Filesize

            1024KB

          • memory/5076-2-0x0000000000D40000-0x0000000000D53000-memory.dmp

            Filesize

            76KB

          • memory/5076-4-0x0000000000400000-0x0000000000C1F000-memory.dmp

            Filesize

            8.1MB

          • memory/5076-8-0x0000000000D40000-0x0000000000D53000-memory.dmp

            Filesize

            76KB

          • memory/5076-7-0x0000000000400000-0x0000000000C1F000-memory.dmp

            Filesize

            8.1MB