Analysis

  • max time kernel
    150s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240226-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
  • submitted
    26/03/2024, 10:20

General

  • Target

    deed33d8537ad5384cd927b88df28494.exe

  • Size

    12.1MB

  • MD5

    deed33d8537ad5384cd927b88df28494

  • SHA1

    49586c8d73492b95d4cc2eb77db1c43b664cb534

  • SHA256

    6eaff3a3059d64fba8aaf22757cd51de82addb4f84f24f87aa3292a95d0825ca

  • SHA512

    26be2d580be0f355f6c6f2a2bb0d8b913d178bda678a36480ddae95ca85ffa64a2fd8e1a8017c07ef5ba03ea8a1d0d4b6d2134d508d6f740e93db8c551ccbcea

  • SSDEEP

    49152:zyqI2kmso555555555555555555555555555555555555555555555555555555T:zyqI2

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
  • Drops file in System32 directory 2 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\deed33d8537ad5384cd927b88df28494.exe
    "C:\Users\Admin\AppData\Local\Temp\deed33d8537ad5384cd927b88df28494.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4260
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\lylhnhqf\
      2⤵
        PID:2328
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\tvqwpcm.exe" C:\Windows\SysWOW64\lylhnhqf\
        2⤵
          PID:2860
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create lylhnhqf binPath= "C:\Windows\SysWOW64\lylhnhqf\tvqwpcm.exe /d\"C:\Users\Admin\AppData\Local\Temp\deed33d8537ad5384cd927b88df28494.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4408
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description lylhnhqf "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4984
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start lylhnhqf
          2⤵
          • Launches sc.exe
          PID:4844
        • 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:1836
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4260 -s 1044
          2⤵
          • Program crash
          PID:3016
      • C:\Windows\SysWOW64\lylhnhqf\tvqwpcm.exe
        C:\Windows\SysWOW64\lylhnhqf\tvqwpcm.exe /d"C:\Users\Admin\AppData\Local\Temp\deed33d8537ad5384cd927b88df28494.exe"
        1⤵
        • Executes dropped EXE
        • Drops file in System32 directory
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4708
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Deletes itself
          PID:524
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4708 -s 524
          2⤵
          • Program crash
          PID:4148
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 472 -p 4260 -ip 4260
        1⤵
          PID:3760
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 428 -p 4708 -ip 4708
          1⤵
            PID:1528

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

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

            Filesize

            11.0MB

            MD5

            d1c78fcfbc3a5262649e77cff98be43d

            SHA1

            5ef136647957980055ae386066deeac7cafcfcd8

            SHA256

            5f66c0b1051813c566fdf24230ea6a26c285897611f8e32d20c630e0f78f660e

            SHA512

            64850b4faea01258989ea6dc90b8450f81a9a1681623013e682e0a3d7348c939d12d497eece34b0d4275c3859ea49ba33bb7d3c90351da5b94bde45b810ace63

          • memory/524-9-0x0000000000BE0000-0x0000000000BF5000-memory.dmp

            Filesize

            84KB

          • memory/524-14-0x0000000000BE0000-0x0000000000BF5000-memory.dmp

            Filesize

            84KB

          • memory/524-17-0x0000000000BE0000-0x0000000000BF5000-memory.dmp

            Filesize

            84KB

          • memory/524-18-0x0000000000BE0000-0x0000000000BF5000-memory.dmp

            Filesize

            84KB

          • memory/524-19-0x0000000000BE0000-0x0000000000BF5000-memory.dmp

            Filesize

            84KB

          • memory/4260-3-0x0000000000400000-0x000000000046E000-memory.dmp

            Filesize

            440KB

          • memory/4260-2-0x00000000004B0000-0x00000000004C3000-memory.dmp

            Filesize

            76KB

          • memory/4260-1-0x00000000004D0000-0x00000000005D0000-memory.dmp

            Filesize

            1024KB

          • memory/4260-16-0x0000000000400000-0x000000000046E000-memory.dmp

            Filesize

            440KB

          • memory/4708-8-0x0000000000700000-0x0000000000800000-memory.dmp

            Filesize

            1024KB

          • memory/4708-10-0x00000000006C0000-0x00000000006D3000-memory.dmp

            Filesize

            76KB

          • memory/4708-12-0x0000000000400000-0x000000000046E000-memory.dmp

            Filesize

            440KB