Analysis

  • max time kernel
    146s
  • max time network
    149s
  • 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 14:14

General

  • Target

    8240e21305559cabc41ccf60e6683e8fb3f6ae80a20e289e687366ccc4594c40.exe

  • Size

    203KB

  • MD5

    6b7204c0cb219b7d01999025ccd85fdc

  • SHA1

    1f57fbfdcf6d71d0d5a36602e1e83bc9dee3ac7a

  • SHA256

    8240e21305559cabc41ccf60e6683e8fb3f6ae80a20e289e687366ccc4594c40

  • SHA512

    68a19f84eb4d73394a2bb2b7629f9582e91b54713b19e71722ba5359636ce36d9aa9951af7b729d65752a7aff916ee91abd87f34c2e4aad43cebef777800742b

  • SSDEEP

    3072:eSf/dfuraZJXENc8uCXJiXK1K2LS1G2B+vioyUSdUuD5BBNcRrxOJ+cmH:eSf/MQ15t1TB+PSHexLco

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 6 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\8240e21305559cabc41ccf60e6683e8fb3f6ae80a20e289e687366ccc4594c40.exe
    "C:\Users\Admin\AppData\Local\Temp\8240e21305559cabc41ccf60e6683e8fb3f6ae80a20e289e687366ccc4594c40.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4728
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\zzwwmrio\
      2⤵
        PID:4308
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\frzwcpvt.exe" C:\Windows\SysWOW64\zzwwmrio\
        2⤵
          PID:516
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create zzwwmrio binPath= "C:\Windows\SysWOW64\zzwwmrio\frzwcpvt.exe /d\"C:\Users\Admin\AppData\Local\Temp\8240e21305559cabc41ccf60e6683e8fb3f6ae80a20e289e687366ccc4594c40.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:220
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description zzwwmrio "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3068
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start zzwwmrio
          2⤵
          • Launches sc.exe
          PID:3624
        • 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:2656
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4728 -s 1252
          2⤵
          • Program crash
          PID:3516
      • C:\Windows\SysWOW64\zzwwmrio\frzwcpvt.exe
        C:\Windows\SysWOW64\zzwwmrio\frzwcpvt.exe /d"C:\Users\Admin\AppData\Local\Temp\8240e21305559cabc41ccf60e6683e8fb3f6ae80a20e289e687366ccc4594c40.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1768
        • 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:4200
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1768 -s 524
          2⤵
          • Program crash
          PID:1960
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 464 -p 1768 -ip 1768
        1⤵
          PID:1924
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 500 -p 4728 -ip 4728
          1⤵
            PID:2772

          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\frzwcpvt.exe
            Filesize

            14.4MB

            MD5

            7d03b22a0701d9f4073fc882d640d52c

            SHA1

            47d1b33f4f73c4ccdb4df275b11ce011fbdfb0b2

            SHA256

            9dc38225ad9744ca22db9e8c9736a0d28c454bc61a3dc563e16e23448a50384f

            SHA512

            57bde4d1d6ba3c38c13f4881c60e5c543dbf7172681530481b9f9ee67cac85e93df5d020ba8be04bbaffc67ef86c4d52cbb84c0427dd556225c6552b37854d9f

          • memory/1768-8-0x00000000005C0000-0x00000000006C0000-memory.dmp
            Filesize

            1024KB

          • memory/1768-15-0x0000000000400000-0x0000000000438000-memory.dmp
            Filesize

            224KB

          • memory/1768-9-0x0000000000400000-0x0000000000438000-memory.dmp
            Filesize

            224KB

          • memory/4200-31-0x0000000001790000-0x00000000017A0000-memory.dmp
            Filesize

            64KB

          • memory/4200-34-0x0000000001790000-0x00000000017A0000-memory.dmp
            Filesize

            64KB

          • memory/4200-10-0x00000000001C0000-0x00000000001D5000-memory.dmp
            Filesize

            84KB

          • memory/4200-13-0x00000000001C0000-0x00000000001D5000-memory.dmp
            Filesize

            84KB

          • memory/4200-58-0x00000000001C0000-0x00000000001D5000-memory.dmp
            Filesize

            84KB

          • memory/4200-54-0x00000000017F0000-0x00000000017F7000-memory.dmp
            Filesize

            28KB

          • memory/4200-16-0x00000000001C0000-0x00000000001D5000-memory.dmp
            Filesize

            84KB

          • memory/4200-17-0x00000000001C0000-0x00000000001D5000-memory.dmp
            Filesize

            84KB

          • memory/4200-19-0x0000000002000000-0x000000000220F000-memory.dmp
            Filesize

            2.1MB

          • memory/4200-22-0x0000000002000000-0x000000000220F000-memory.dmp
            Filesize

            2.1MB

          • memory/4200-23-0x0000000000BD0000-0x0000000000BD6000-memory.dmp
            Filesize

            24KB

          • memory/4200-26-0x0000000001790000-0x00000000017A0000-memory.dmp
            Filesize

            64KB

          • memory/4200-29-0x0000000001790000-0x00000000017A0000-memory.dmp
            Filesize

            64KB

          • memory/4200-30-0x0000000001790000-0x00000000017A0000-memory.dmp
            Filesize

            64KB

          • memory/4200-53-0x0000000007000000-0x000000000740B000-memory.dmp
            Filesize

            4.0MB

          • memory/4200-32-0x0000000001790000-0x00000000017A0000-memory.dmp
            Filesize

            64KB

          • memory/4200-33-0x0000000001790000-0x00000000017A0000-memory.dmp
            Filesize

            64KB

          • memory/4200-50-0x0000000007000000-0x000000000740B000-memory.dmp
            Filesize

            4.0MB

          • memory/4200-35-0x0000000001790000-0x00000000017A0000-memory.dmp
            Filesize

            64KB

          • memory/4200-36-0x0000000001790000-0x00000000017A0000-memory.dmp
            Filesize

            64KB

          • memory/4200-37-0x0000000001790000-0x00000000017A0000-memory.dmp
            Filesize

            64KB

          • memory/4200-38-0x0000000001790000-0x00000000017A0000-memory.dmp
            Filesize

            64KB

          • memory/4200-39-0x0000000001790000-0x00000000017A0000-memory.dmp
            Filesize

            64KB

          • memory/4200-40-0x0000000001790000-0x00000000017A0000-memory.dmp
            Filesize

            64KB

          • memory/4200-41-0x0000000001790000-0x00000000017A0000-memory.dmp
            Filesize

            64KB

          • memory/4200-42-0x0000000001790000-0x00000000017A0000-memory.dmp
            Filesize

            64KB

          • memory/4200-43-0x0000000001790000-0x00000000017A0000-memory.dmp
            Filesize

            64KB

          • memory/4200-44-0x0000000001790000-0x00000000017A0000-memory.dmp
            Filesize

            64KB

          • memory/4200-45-0x0000000001790000-0x00000000017A0000-memory.dmp
            Filesize

            64KB

          • memory/4200-46-0x00000000017E0000-0x00000000017E5000-memory.dmp
            Filesize

            20KB

          • memory/4200-49-0x00000000017E0000-0x00000000017E5000-memory.dmp
            Filesize

            20KB

          • memory/4728-3-0x0000000002180000-0x0000000002193000-memory.dmp
            Filesize

            76KB

          • memory/4728-1-0x00000000005C0000-0x00000000006C0000-memory.dmp
            Filesize

            1024KB

          • memory/4728-4-0x0000000000400000-0x0000000000438000-memory.dmp
            Filesize

            224KB

          • memory/4728-14-0x0000000000400000-0x0000000000438000-memory.dmp
            Filesize

            224KB