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
    25/03/2024, 15:47

General

  • Target

    de5f0b876145c3072389c0af52539a06.exe

  • Size

    11.6MB

  • MD5

    de5f0b876145c3072389c0af52539a06

  • SHA1

    8fcb3d87bdb58c8f5eb5cd5d439fb08c88e19c23

  • SHA256

    fbc03327661ed973c859257eb8ad4941108669c968de30a2ef77af775fe0e960

  • SHA512

    858c78636b4c50791353b11df415e51bb8e3a2da4e2cda94ec2468a611db42ce30c3c3af3fa402825b2010eaad6f982088b293ddcc592726531933a4549092fc

  • SSDEEP

    49152:L88888888888888888888888888888888888888888888888888888888888888T:

Malware Config

Extracted

Family

tofsee

C2

defeatwax.ru

refabyd.info

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\de5f0b876145c3072389c0af52539a06.exe
    "C:\Users\Admin\AppData\Local\Temp\de5f0b876145c3072389c0af52539a06.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:1656
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\deroavu\
      2⤵
        PID:3148
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\jeorfqqy.exe" C:\Windows\SysWOW64\deroavu\
        2⤵
          PID:3424
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create deroavu binPath= "C:\Windows\SysWOW64\deroavu\jeorfqqy.exe /d\"C:\Users\Admin\AppData\Local\Temp\de5f0b876145c3072389c0af52539a06.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2036
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description deroavu "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3432
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start deroavu
          2⤵
          • Launches sc.exe
          PID:4924
        • 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:3208
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1656 -s 1292
          2⤵
          • Program crash
          PID:2024
      • C:\Windows\SysWOW64\deroavu\jeorfqqy.exe
        C:\Windows\SysWOW64\deroavu\jeorfqqy.exe /d"C:\Users\Admin\AppData\Local\Temp\de5f0b876145c3072389c0af52539a06.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4060
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Deletes itself
          PID:3264
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4060 -s 544
          2⤵
          • Program crash
          PID:4316
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 1656 -ip 1656
        1⤵
          PID:1900
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 532 -p 4060 -ip 4060
          1⤵
            PID:4724

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

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

            Filesize

            8.1MB

            MD5

            ba0f71e13281a5ccc970321bffc92113

            SHA1

            8e1e294a319ae8073ced26632f18f8bc00fb5d51

            SHA256

            b42f8f1fa25b94dbf738ef1b63dea163af5c29c0cd4b9f791ee887eeced69344

            SHA512

            436d83a28668e9c692221994c706905af0bd4866c555f5fcb203681b0e0d0c872958544aacad76e650609ee10080c846a121185462ab301f51dfe39fe40b9737

          • C:\Windows\SysWOW64\deroavu\jeorfqqy.exe

            Filesize

            4.2MB

            MD5

            26160d8483a6609e372812a558198e0a

            SHA1

            0b5ebfdce274f72a8e6043b354d7dcae903aec21

            SHA256

            bd31765268b24c5717361c31462551cfab82a0e9d1ff400afdef5acee824263c

            SHA512

            9fdcedc7a5b8c734a559e21ac43b91ed09ceb93a28b39ce6f6ecc22f124d921103510dc0b0a8e573aeb45f834c73f645d239a94e34dcccb08f1488a7d19ac434

          • memory/1656-8-0x0000000000400000-0x0000000002C68000-memory.dmp

            Filesize

            40.4MB

          • memory/1656-4-0x0000000000400000-0x0000000002C68000-memory.dmp

            Filesize

            40.4MB

          • memory/1656-2-0x00000000049B0000-0x00000000049C3000-memory.dmp

            Filesize

            76KB

          • memory/1656-9-0x00000000049B0000-0x00000000049C3000-memory.dmp

            Filesize

            76KB

          • memory/1656-1-0x0000000002D90000-0x0000000002E90000-memory.dmp

            Filesize

            1024KB

          • memory/3264-11-0x0000000000510000-0x0000000000525000-memory.dmp

            Filesize

            84KB

          • memory/3264-16-0x0000000000510000-0x0000000000525000-memory.dmp

            Filesize

            84KB

          • memory/3264-17-0x0000000000510000-0x0000000000525000-memory.dmp

            Filesize

            84KB

          • memory/3264-19-0x0000000000510000-0x0000000000525000-memory.dmp

            Filesize

            84KB

          • memory/4060-10-0x0000000002F00000-0x0000000003000000-memory.dmp

            Filesize

            1024KB

          • memory/4060-14-0x0000000000400000-0x0000000002C68000-memory.dmp

            Filesize

            40.4MB

          • memory/4060-18-0x0000000000400000-0x0000000002C68000-memory.dmp

            Filesize

            40.4MB