Analysis

  • max time kernel
    143s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240412-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240412-enlocale:en-usos:windows10-2004-x64system
  • submitted
    17-04-2024 13:33

General

  • Target

    bc822ed934731c6843e138a7b5a0f643b6852ee233b0fb861040bd95111d09f5.exe

  • Size

    239KB

  • MD5

    a520a1746783fd618b1f805ce48b313f

  • SHA1

    d66c729c5d5b49c0e02f8f692425a6d4743f58cf

  • SHA256

    bc822ed934731c6843e138a7b5a0f643b6852ee233b0fb861040bd95111d09f5

  • SHA512

    04e948f7e1df4856d65e30abfcca3a9ff7417f3e572df32b98d268bd982f87d97fc0a4a955ebe6e75de13d1d0e22132269e4c74124927385010feb00bd34066e

  • SSDEEP

    6144:IfULzEiwjQjbSnDuWi+Ygh5pUTQYJkge:hXEiwjhn4gh5Wtkv

Malware Config

Extracted

Family

tofsee

C2

vanaheim.cn

jotunheim.name

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
  • Modifies data under HKEY_USERS 3 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\bc822ed934731c6843e138a7b5a0f643b6852ee233b0fb861040bd95111d09f5.exe
    "C:\Users\Admin\AppData\Local\Temp\bc822ed934731c6843e138a7b5a0f643b6852ee233b0fb861040bd95111d09f5.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4620
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\voeninsq\
      2⤵
        PID:3372
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\mpmfwysi.exe" C:\Windows\SysWOW64\voeninsq\
        2⤵
          PID:2340
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create voeninsq binPath= "C:\Windows\SysWOW64\voeninsq\mpmfwysi.exe /d\"C:\Users\Admin\AppData\Local\Temp\bc822ed934731c6843e138a7b5a0f643b6852ee233b0fb861040bd95111d09f5.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3696
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description voeninsq "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2624
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start voeninsq
          2⤵
          • Launches sc.exe
          PID:3344
        • 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:4512
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4620 -s 648
          2⤵
          • Program crash
          PID:3480
      • C:\Windows\SysWOW64\voeninsq\mpmfwysi.exe
        C:\Windows\SysWOW64\voeninsq\mpmfwysi.exe /d"C:\Users\Admin\AppData\Local\Temp\bc822ed934731c6843e138a7b5a0f643b6852ee233b0fb861040bd95111d09f5.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3184
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Deletes itself
          • Drops file in System32 directory
          • Modifies data under HKEY_USERS
          PID:676
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3184 -s 516
          2⤵
          • Program crash
          PID:1548
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 4620 -ip 4620
        1⤵
          PID:4588
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 3184 -ip 3184
          1⤵
            PID:3068

          Network

          MITRE ATT&CK Matrix ATT&CK v13

          Persistence

          Create or Modify System Process

          2
          T1543

          Windows Service

          2
          T1543.003

          Boot or Logon Autostart Execution

          1
          T1547

          Registry Run Keys / Startup Folder

          1
          T1547.001

          Privilege Escalation

          Create or Modify System Process

          2
          T1543

          Windows Service

          2
          T1543.003

          Boot or Logon Autostart Execution

          1
          T1547

          Registry Run Keys / Startup Folder

          1
          T1547.001

          Defense Evasion

          Impair Defenses

          1
          T1562

          Disable or Modify System Firewall

          1
          T1562.004

          Modify Registry

          1
          T1112

          Discovery

          Query Registry

          1
          T1012

          System Information Discovery

          2
          T1082

          Replay Monitor

          Loading Replay Monitor...

          Downloads

          • C:\Users\Admin\AppData\Local\Temp\mpmfwysi.exe
            Filesize

            11.3MB

            MD5

            c9fa9778327bb0ec4f00e71bca0748ef

            SHA1

            266e8e39c51894f0c7ed779821bbc27654de970c

            SHA256

            b80f2df963090b212c4b96c2f4efd87e7a32f525253c94eed8250e8a570db836

            SHA512

            059b87f10cb6e07a72ade400216fdc44947481f5a18ba2aa31a927b65eeb332d96fddcffc463e61defa9dc2babd7986c7063c163608bb371348bd1e36d1803e7

          • memory/676-15-0x0000000000B30000-0x0000000000B45000-memory.dmp
            Filesize

            84KB

          • memory/676-12-0x0000000000B30000-0x0000000000B45000-memory.dmp
            Filesize

            84KB

          • memory/676-16-0x0000000000B30000-0x0000000000B45000-memory.dmp
            Filesize

            84KB

          • memory/676-17-0x0000000000B30000-0x0000000000B45000-memory.dmp
            Filesize

            84KB

          • memory/676-20-0x0000000000B30000-0x0000000000B45000-memory.dmp
            Filesize

            84KB

          • memory/3184-10-0x0000000000900000-0x0000000000A00000-memory.dmp
            Filesize

            1024KB

          • memory/3184-11-0x0000000000400000-0x000000000085D000-memory.dmp
            Filesize

            4.4MB

          • memory/3184-18-0x0000000000400000-0x000000000085D000-memory.dmp
            Filesize

            4.4MB

          • memory/4620-4-0x0000000000400000-0x000000000085D000-memory.dmp
            Filesize

            4.4MB

          • memory/4620-2-0x0000000000B00000-0x0000000000B13000-memory.dmp
            Filesize

            76KB

          • memory/4620-8-0x0000000000400000-0x000000000085D000-memory.dmp
            Filesize

            4.4MB

          • memory/4620-9-0x0000000000B00000-0x0000000000B13000-memory.dmp
            Filesize

            76KB

          • memory/4620-1-0x0000000000B20000-0x0000000000C20000-memory.dmp
            Filesize

            1024KB