Analysis

  • max time kernel
    145s
  • max time network
    142s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    03-09-2024 10:23

General

  • Target

    48e0ce9cfa0bd0951aaf6cff66593631c06472384d593641fe76854c7d0b3f82.exe

  • Size

    11.2MB

  • MD5

    ffdceebfd66c68c128cd5c7e349881b5

  • SHA1

    19e173e67dea7a78b95bce015cf4a58dc2f976c7

  • SHA256

    48e0ce9cfa0bd0951aaf6cff66593631c06472384d593641fe76854c7d0b3f82

  • SHA512

    be958ffd1343a1e1c06ea68a29fa6861c6a1762a74f227190c7d2597a0a64f9926527491b8a11835975d6bf7743359423c9dbf090523d9585c7d1afb623acbd8

  • SSDEEP

    49152:wNbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb7:w

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\48e0ce9cfa0bd0951aaf6cff66593631c06472384d593641fe76854c7d0b3f82.exe
    "C:\Users\Admin\AppData\Local\Temp\48e0ce9cfa0bd0951aaf6cff66593631c06472384d593641fe76854c7d0b3f82.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3228
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\bwfwplvo\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:4944
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\uokqbldj.exe" C:\Windows\SysWOW64\bwfwplvo\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3672
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create bwfwplvo binPath= "C:\Windows\SysWOW64\bwfwplvo\uokqbldj.exe /d\"C:\Users\Admin\AppData\Local\Temp\48e0ce9cfa0bd0951aaf6cff66593631c06472384d593641fe76854c7d0b3f82.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3184
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description bwfwplvo "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1544
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start bwfwplvo
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4780
    • 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:116
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3228 -s 1280
      2⤵
      • Program crash
      PID:2456
  • C:\Windows\SysWOW64\bwfwplvo\uokqbldj.exe
    C:\Windows\SysWOW64\bwfwplvo\uokqbldj.exe /d"C:\Users\Admin\AppData\Local\Temp\48e0ce9cfa0bd0951aaf6cff66593631c06472384d593641fe76854c7d0b3f82.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2620
    • C:\Windows\SysWOW64\svchost.exe
      svchost.exe
      2⤵
      • Sets service image path in registry
      • Deletes itself
      • System Location Discovery: System Language Discovery
      PID:2288
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2620 -s 512
      2⤵
      • Program crash
      PID:3984
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 3228 -ip 3228
    1⤵
      PID:1528
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 2620 -ip 2620
      1⤵
        PID:3416

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

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

        Filesize

        13.7MB

        MD5

        ec092c236cd0fc14fea27dbd66a88156

        SHA1

        15c6f569222bc13ca91530d16b75c80099f9e497

        SHA256

        602ad1c86aab37f2b4e481b0f7b221778c67471da959f30cf591effe1ba0fd9e

        SHA512

        6bec786b74357c2a18f7b97d520408bcb6107c3138c6dbcd81b8ba3ceb08adf2964f3685ee9c1ec82e1c27f257fd15e23a6a04d2b8b3894d3fc9242597dbe9dd

      • memory/2288-11-0x0000000001100000-0x0000000001115000-memory.dmp

        Filesize

        84KB

      • memory/2288-13-0x0000000001100000-0x0000000001115000-memory.dmp

        Filesize

        84KB

      • memory/2288-14-0x0000000001100000-0x0000000001115000-memory.dmp

        Filesize

        84KB

      • memory/2620-15-0x0000000000400000-0x0000000002B90000-memory.dmp

        Filesize

        39.6MB

      • memory/3228-1-0x0000000002DF0000-0x0000000002EF0000-memory.dmp

        Filesize

        1024KB

      • memory/3228-2-0x00000000001C0000-0x00000000001D3000-memory.dmp

        Filesize

        76KB

      • memory/3228-3-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/3228-10-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/3228-9-0x00000000001C0000-0x00000000001D3000-memory.dmp

        Filesize

        76KB

      • memory/3228-8-0x0000000000400000-0x0000000002B90000-memory.dmp

        Filesize

        39.6MB