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Analysis

  • max time kernel
    168s
  • max time network
    177s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231215-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
  • submitted
    30/12/2023, 11:51

General

  • Target

    1796279f87df5f4d66030525b7e8e39c.exe

  • Size

    13.8MB

  • MD5

    1796279f87df5f4d66030525b7e8e39c

  • SHA1

    a45b65e9060ca0d28fd2875b22b8540067db6832

  • SHA256

    00a414b5c275653c18a3cc06ae1d1d9de9e07144f0a6091fa46f51e482a0dae6

  • SHA512

    8b381fd38d8a538a408a29c70d2532403e36caadae46bf20b2f1786cbe1942c67ca310a4faab777b5c576062cd2ecf57c4edac5526cbf96a6e6dd413f2950b06

  • SSDEEP

    3072:8kAgDr/XSqon0LUwWQ2UHxqms7/7btm52yls2LC5J8ZWwoQSwgeb7hiOiPg0tGif:8khDr/+0LUdbKhsMs268UoSwrb7SpG

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 1 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\1796279f87df5f4d66030525b7e8e39c.exe
    "C:\Users\Admin\AppData\Local\Temp\1796279f87df5f4d66030525b7e8e39c.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4720
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\nezolfwl\
      2⤵
        PID:2936
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\zzwrulcu.exe" C:\Windows\SysWOW64\nezolfwl\
        2⤵
          PID:1932
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create nezolfwl binPath= "C:\Windows\SysWOW64\nezolfwl\zzwrulcu.exe /d\"C:\Users\Admin\AppData\Local\Temp\1796279f87df5f4d66030525b7e8e39c.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2640
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description nezolfwl "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:5088
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start nezolfwl
          2⤵
          • Launches sc.exe
          PID:4488
        • 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:4552
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4720 -s 788
          2⤵
          • Program crash
          PID:3048
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 4720 -ip 4720
        1⤵
          PID:1636
        • C:\Windows\SysWOW64\nezolfwl\zzwrulcu.exe
          C:\Windows\SysWOW64\nezolfwl\zzwrulcu.exe /d"C:\Users\Admin\AppData\Local\Temp\1796279f87df5f4d66030525b7e8e39c.exe"
          1⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious use of WriteProcessMemory
          PID:4404
          • C:\Windows\SysWOW64\svchost.exe
            svchost.exe
            2⤵
            • Sets service image path in registry
            • Deletes itself
            PID:4700
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 4404 -s 524
            2⤵
            • Program crash
            PID:4140
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 532 -p 4404 -ip 4404
          1⤵
            PID:752

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

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          Downloads

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

            Filesize

            10.0MB

            MD5

            a3c8e29623ba0dac25812f64483836ab

            SHA1

            1ccf199642f399bc8090c803586b1c2273a1d9f3

            SHA256

            3b94146017099c425daaf5c2e6ee748fe58d41c36f078b72920a0f8d85a642d3

            SHA512

            12bb5f87bb99f64d34fecee90d3f873d0c51b2dd8cb67fc9b0ef7152e1110b367de4d7601dd6bbd485036be05d3f1b10356eb4f3cfe8654654a8c80857078239

          • memory/4404-14-0x0000000003250000-0x0000000003350000-memory.dmp

            Filesize

            1024KB

          • memory/4404-18-0x0000000000400000-0x000000000324F000-memory.dmp

            Filesize

            46.3MB

          • memory/4404-20-0x0000000000400000-0x000000000324F000-memory.dmp

            Filesize

            46.3MB

          • memory/4700-23-0x00000000005B0000-0x00000000005C5000-memory.dmp

            Filesize

            84KB

          • memory/4700-22-0x00000000005B0000-0x00000000005C5000-memory.dmp

            Filesize

            84KB

          • memory/4700-15-0x00000000005B0000-0x00000000005C5000-memory.dmp

            Filesize

            84KB

          • memory/4700-21-0x00000000005B0000-0x00000000005C5000-memory.dmp

            Filesize

            84KB

          • memory/4700-19-0x00000000005B0000-0x00000000005C5000-memory.dmp

            Filesize

            84KB

          • memory/4720-10-0x00000000033A0000-0x00000000034A0000-memory.dmp

            Filesize

            1024KB

          • memory/4720-12-0x0000000000400000-0x000000000324F000-memory.dmp

            Filesize

            46.3MB

          • memory/4720-1-0x00000000033A0000-0x00000000034A0000-memory.dmp

            Filesize

            1024KB

          • memory/4720-3-0x0000000000400000-0x000000000324F000-memory.dmp

            Filesize

            46.3MB

          • memory/4720-13-0x0000000004E50000-0x0000000004E63000-memory.dmp

            Filesize

            76KB

          • memory/4720-2-0x0000000004E50000-0x0000000004E63000-memory.dmp

            Filesize

            76KB

          • memory/4720-5-0x0000000000400000-0x000000000324F000-memory.dmp

            Filesize

            46.3MB