Analysis

  • max time kernel
    147s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    01-09-2024 12:32

General

  • Target

    d26320c9bf38d0c8da62667729d9c28c8c9a71bb1395bf33dff11b59cda8f6c4.exe

  • Size

    10.6MB

  • MD5

    32cbda26c9835c1c63f2fed688fb5bb9

  • SHA1

    1b8b5445b2ff31e5377c0a2297672bf656695777

  • SHA256

    d26320c9bf38d0c8da62667729d9c28c8c9a71bb1395bf33dff11b59cda8f6c4

  • SHA512

    34246c7b622d4ff88c401d25da883962dfba46c878bf9387f3b72942add8ccfe1785b4c5dfbacfcbbc1a3f40e866cc701ce2ff8f2334868ae16b150e61de4e5e

  • SSDEEP

    12288:KQeoegEG/Rl1M7jjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjz:KQeGX1M

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) 2 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).

  • Event Triggered Execution: Netsh Helper DLL 1 TTPs 3 IoCs

    Netsh.exe (also referred to as Netshell) is a command-line scripting utility used to interact with the network configuration of a system.

  • Program crash 2 IoCs
  • System Location Discovery: System Language Discovery 1 TTPs 9 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\d26320c9bf38d0c8da62667729d9c28c8c9a71bb1395bf33dff11b59cda8f6c4.exe
    "C:\Users\Admin\AppData\Local\Temp\d26320c9bf38d0c8da62667729d9c28c8c9a71bb1395bf33dff11b59cda8f6c4.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3296
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\yrnkftyr\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3948
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\wmhtnzdv.exe" C:\Windows\SysWOW64\yrnkftyr\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1604
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create yrnkftyr binPath= "C:\Windows\SysWOW64\yrnkftyr\wmhtnzdv.exe /d\"C:\Users\Admin\AppData\Local\Temp\d26320c9bf38d0c8da62667729d9c28c8c9a71bb1395bf33dff11b59cda8f6c4.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1584
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description yrnkftyr "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4324
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start yrnkftyr
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1188
    • 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
      • Event Triggered Execution: Netsh Helper DLL
      • System Location Discovery: System Language Discovery
      PID:5008
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3296 -s 1268
      2⤵
      • Program crash
      PID:1052
  • C:\Windows\SysWOW64\yrnkftyr\wmhtnzdv.exe
    C:\Windows\SysWOW64\yrnkftyr\wmhtnzdv.exe /d"C:\Users\Admin\AppData\Local\Temp\d26320c9bf38d0c8da62667729d9c28c8c9a71bb1395bf33dff11b59cda8f6c4.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4796
    • C:\Windows\SysWOW64\svchost.exe
      svchost.exe
      2⤵
      • Sets service image path in registry
      • Deletes itself
      • System Location Discovery: System Language Discovery
      PID:2088
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4796 -s 536
      2⤵
      • Program crash
      PID:2748
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 3296 -ip 3296
    1⤵
      PID:868
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 536 -p 4796 -ip 4796
      1⤵
        PID:2040

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

      Loading Replay Monitor...

      Downloads

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

        Filesize

        10.1MB

        MD5

        869784be2c80a0110cfb4d45829aa8a2

        SHA1

        8489e7e81e069b76b5aabe6ef3f63f9e701b8bad

        SHA256

        24ffdb941f7abae94e4892c644db06c9304d7d0b2cd67222f483205a0ed0c408

        SHA512

        8d0dfa2d84863ff2db44289b740d2c955927f40cf89643f64a85a569bf9eb3f2e7f6544134703b5929276cdbbdf3e5bc30d804a0bb71405086b2d89e65c92598

      • memory/2088-12-0x00000000010C0000-0x00000000010D5000-memory.dmp

        Filesize

        84KB

      • memory/2088-17-0x00000000010C0000-0x00000000010D5000-memory.dmp

        Filesize

        84KB

      • memory/2088-14-0x00000000010C0000-0x00000000010D5000-memory.dmp

        Filesize

        84KB

      • memory/3296-9-0x00000000008F0000-0x0000000000903000-memory.dmp

        Filesize

        76KB

      • memory/3296-10-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/3296-1-0x0000000000930000-0x0000000000A30000-memory.dmp

        Filesize

        1024KB

      • memory/3296-8-0x0000000000400000-0x000000000086A000-memory.dmp

        Filesize

        4.4MB

      • memory/3296-3-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/3296-2-0x00000000008F0000-0x0000000000903000-memory.dmp

        Filesize

        76KB

      • memory/4796-11-0x0000000000400000-0x000000000086A000-memory.dmp

        Filesize

        4.4MB

      • memory/4796-15-0x0000000000400000-0x000000000086A000-memory.dmp

        Filesize

        4.4MB

      • memory/4796-16-0x0000000000400000-0x000000000086A000-memory.dmp

        Filesize

        4.4MB