Analysis

  • max time kernel
    148s
  • max time network
    151s
  • 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 12:22

General

  • Target

    7c44a7de2a7c4175c761e08a2de5d2acd42ad3195d7686e5b8d507f99c30adc8.exe

  • Size

    229KB

  • MD5

    ddb3205a92ff18ae17b3f9f93c7b197c

  • SHA1

    b77c666a2d7b1f63ba08316f9a221be6ac1f786a

  • SHA256

    7c44a7de2a7c4175c761e08a2de5d2acd42ad3195d7686e5b8d507f99c30adc8

  • SHA512

    db659ead4fd2ed186f221adf5bb9ab5b686253454eeb307ba247a99d8026c009d72ed11473d4622146c7b6cf59f445ad3b020ac3394d3f61af5bfd385b43c334

  • SSDEEP

    3072:lnUQviqZALXadUs0vEJimn1K29YbqYZgpLneYDR89fJ5j3UxS6MeILYS:lnUzPjflapLnsdT3U2eILY

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\7c44a7de2a7c4175c761e08a2de5d2acd42ad3195d7686e5b8d507f99c30adc8.exe
    "C:\Users\Admin\AppData\Local\Temp\7c44a7de2a7c4175c761e08a2de5d2acd42ad3195d7686e5b8d507f99c30adc8.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:2820
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\gopefget\
      2⤵
        PID:2664
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\iuczfsyw.exe" C:\Windows\SysWOW64\gopefget\
        2⤵
          PID:2164
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create gopefget binPath= "C:\Windows\SysWOW64\gopefget\iuczfsyw.exe /d\"C:\Users\Admin\AppData\Local\Temp\7c44a7de2a7c4175c761e08a2de5d2acd42ad3195d7686e5b8d507f99c30adc8.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2964
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description gopefget "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1224
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start gopefget
          2⤵
          • Launches sc.exe
          PID:4012
        • 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:3008
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2820 -s 768
          2⤵
          • Program crash
          PID:1924
      • C:\Windows\SysWOW64\gopefget\iuczfsyw.exe
        C:\Windows\SysWOW64\gopefget\iuczfsyw.exe /d"C:\Users\Admin\AppData\Local\Temp\7c44a7de2a7c4175c761e08a2de5d2acd42ad3195d7686e5b8d507f99c30adc8.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4684
        • 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:1604
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4684 -s 524
          2⤵
          • Program crash
          PID:4200
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 4684 -ip 4684
        1⤵
          PID:4224
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 480 -p 2820 -ip 2820
          1⤵
            PID:4968

          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\iuczfsyw.exe
            Filesize

            11.4MB

            MD5

            d16358901159d89dc989420e16bf0ff2

            SHA1

            119795d92fb1322007c6b48056ec9a39ea84afe6

            SHA256

            9136292e1609eb7040c9a900af20da1c981a8473535f17e2a07dcc3104588ed5

            SHA512

            bbdc66153bcaa292778bb7bc544bdf2ad8aa53c50a4b50d213f8c34c6fe9fc02fa87472a100f3c1e70ec5ff1d587bd51831cccc1d8a51f759f40ab067ef2d5ed

          • memory/1604-43-0x00000000025F0000-0x0000000002600000-memory.dmp
            Filesize

            64KB

          • memory/1604-45-0x00000000025F0000-0x0000000002600000-memory.dmp
            Filesize

            64KB

          • memory/1604-59-0x0000000000F30000-0x0000000000F45000-memory.dmp
            Filesize

            84KB

          • memory/1604-32-0x00000000025F0000-0x0000000002600000-memory.dmp
            Filesize

            64KB

          • memory/1604-54-0x0000000007D00000-0x000000000810B000-memory.dmp
            Filesize

            4.0MB

          • memory/1604-51-0x0000000007D00000-0x000000000810B000-memory.dmp
            Filesize

            4.0MB

          • memory/1604-10-0x0000000000F30000-0x0000000000F45000-memory.dmp
            Filesize

            84KB

          • memory/1604-14-0x0000000000F30000-0x0000000000F45000-memory.dmp
            Filesize

            84KB

          • memory/1604-50-0x00000000031D0000-0x00000000031D5000-memory.dmp
            Filesize

            20KB

          • memory/1604-34-0x00000000025F0000-0x0000000002600000-memory.dmp
            Filesize

            64KB

          • memory/1604-17-0x0000000000F30000-0x0000000000F45000-memory.dmp
            Filesize

            84KB

          • memory/1604-18-0x0000000000F30000-0x0000000000F45000-memory.dmp
            Filesize

            84KB

          • memory/1604-20-0x0000000002E00000-0x000000000300F000-memory.dmp
            Filesize

            2.1MB

          • memory/1604-35-0x00000000025F0000-0x0000000002600000-memory.dmp
            Filesize

            64KB

          • memory/1604-24-0x0000000000FF0000-0x0000000000FF6000-memory.dmp
            Filesize

            24KB

          • memory/1604-27-0x00000000025F0000-0x0000000002600000-memory.dmp
            Filesize

            64KB

          • memory/1604-30-0x00000000025F0000-0x0000000002600000-memory.dmp
            Filesize

            64KB

          • memory/1604-31-0x00000000025F0000-0x0000000002600000-memory.dmp
            Filesize

            64KB

          • memory/1604-55-0x00000000031E0000-0x00000000031E7000-memory.dmp
            Filesize

            28KB

          • memory/1604-47-0x00000000031D0000-0x00000000031D5000-memory.dmp
            Filesize

            20KB

          • memory/1604-23-0x0000000002E00000-0x000000000300F000-memory.dmp
            Filesize

            2.1MB

          • memory/1604-36-0x00000000025F0000-0x0000000002600000-memory.dmp
            Filesize

            64KB

          • memory/1604-33-0x00000000025F0000-0x0000000002600000-memory.dmp
            Filesize

            64KB

          • memory/1604-37-0x00000000025F0000-0x0000000002600000-memory.dmp
            Filesize

            64KB

          • memory/1604-38-0x00000000025F0000-0x0000000002600000-memory.dmp
            Filesize

            64KB

          • memory/1604-39-0x00000000025F0000-0x0000000002600000-memory.dmp
            Filesize

            64KB

          • memory/1604-40-0x00000000025F0000-0x0000000002600000-memory.dmp
            Filesize

            64KB

          • memory/1604-41-0x00000000025F0000-0x0000000002600000-memory.dmp
            Filesize

            64KB

          • memory/1604-42-0x00000000025F0000-0x0000000002600000-memory.dmp
            Filesize

            64KB

          • memory/1604-46-0x00000000025F0000-0x0000000002600000-memory.dmp
            Filesize

            64KB

          • memory/1604-44-0x00000000025F0000-0x0000000002600000-memory.dmp
            Filesize

            64KB

          • memory/2820-1-0x00000000004E0000-0x00000000005E0000-memory.dmp
            Filesize

            1024KB

          • memory/2820-4-0x0000000000400000-0x000000000043E000-memory.dmp
            Filesize

            248KB

          • memory/2820-16-0x0000000000400000-0x000000000043E000-memory.dmp
            Filesize

            248KB

          • memory/2820-2-0x0000000002050000-0x0000000002063000-memory.dmp
            Filesize

            76KB

          • memory/4684-15-0x0000000000400000-0x000000000043E000-memory.dmp
            Filesize

            248KB

          • memory/4684-11-0x0000000000400000-0x000000000043E000-memory.dmp
            Filesize

            248KB

          • memory/4684-9-0x00000000004C0000-0x00000000004D3000-memory.dmp
            Filesize

            76KB

          • memory/4684-8-0x00000000006D0000-0x00000000007D0000-memory.dmp
            Filesize

            1024KB