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Analysis

  • max time kernel
    147s
  • max time network
    148s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230915-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230915-enlocale:en-usos:windows10-2004-x64system
  • submitted
    01/10/2023, 19:47

General

  • Target

    38eca8e8f88a15c11fdfeadf43c454386d27f479eb1235ae4ddaf3958624ba0a_JC.exe

  • Size

    234KB

  • MD5

    3e54bc559813b3b887de44604644a083

  • SHA1

    6af11930891b523991ee1115c15e9d72b46f3a28

  • SHA256

    38eca8e8f88a15c11fdfeadf43c454386d27f479eb1235ae4ddaf3958624ba0a

  • SHA512

    38a25887bf7ef217dc4ab88a734fdb41a46bc675cde1fe3a7217810754f6bd9be1410c6c2df5bb7d70ff38df20cc828c89fe1d66f0d906e1f37be07760147133

  • SSDEEP

    3072:HDER0MfinkOKUtMSdWxLZ9dUMglZlwrrKST4S5/RFleRATO34:EfQZdWjXUhZ6ZvR0ATV

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 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.

  • Executes dropped EXE 1 IoCs
  • Looks up external IP address via web service 1 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • 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 7 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\38eca8e8f88a15c11fdfeadf43c454386d27f479eb1235ae4ddaf3958624ba0a_JC.exe
    "C:\Users\Admin\AppData\Local\Temp\38eca8e8f88a15c11fdfeadf43c454386d27f479eb1235ae4ddaf3958624ba0a_JC.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4764
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\rgurlbdf\
      2⤵
        PID:2284
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\hqwhfum.exe" C:\Windows\SysWOW64\rgurlbdf\
        2⤵
          PID:3632
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create rgurlbdf binPath= "C:\Windows\SysWOW64\rgurlbdf\hqwhfum.exe /d\"C:\Users\Admin\AppData\Local\Temp\38eca8e8f88a15c11fdfeadf43c454386d27f479eb1235ae4ddaf3958624ba0a_JC.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3520
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description rgurlbdf "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4484
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start rgurlbdf
          2⤵
          • Launches sc.exe
          PID:924
        • 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:940
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4764 -s 1036
          2⤵
          • Program crash
          PID:5088
      • C:\Windows\SysWOW64\rgurlbdf\hqwhfum.exe
        C:\Windows\SysWOW64\rgurlbdf\hqwhfum.exe /d"C:\Users\Admin\AppData\Local\Temp\38eca8e8f88a15c11fdfeadf43c454386d27f479eb1235ae4ddaf3958624ba0a_JC.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1972
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Drops file in System32 directory
          • Modifies data under HKEY_USERS
          PID:4556
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1972 -s 608
          2⤵
          • Program crash
          PID:4492
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 4764 -ip 4764
        1⤵
          PID:4208
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 476 -p 1972 -ip 1972
          1⤵
            PID:2544

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

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

            Filesize

            12.4MB

            MD5

            6961af380255a233fb174bb1b6fe5db6

            SHA1

            d9e1b34b9a2e6147049e5703928d4a3b29873538

            SHA256

            760dd1b8af74897fa185e46f6880820df2666ec3886f4c0acdbd1184e82d033e

            SHA512

            c19fdc46e0e2b315624cc187653a7d26183b7a8fcb4637d182dc84dd3e7e1a2f331cd6001f1dd1af21e6fef5301973eaed37da1b65f5ddf7e038d10b76ccaec2

          • C:\Windows\SysWOW64\rgurlbdf\hqwhfum.exe

            Filesize

            12.4MB

            MD5

            6961af380255a233fb174bb1b6fe5db6

            SHA1

            d9e1b34b9a2e6147049e5703928d4a3b29873538

            SHA256

            760dd1b8af74897fa185e46f6880820df2666ec3886f4c0acdbd1184e82d033e

            SHA512

            c19fdc46e0e2b315624cc187653a7d26183b7a8fcb4637d182dc84dd3e7e1a2f331cd6001f1dd1af21e6fef5301973eaed37da1b65f5ddf7e038d10b76ccaec2

          • memory/1972-16-0x0000000000400000-0x0000000000447000-memory.dmp

            Filesize

            284KB

          • memory/1972-10-0x0000000000400000-0x0000000000447000-memory.dmp

            Filesize

            284KB

          • memory/4556-32-0x00000000019F0000-0x0000000001A00000-memory.dmp

            Filesize

            64KB

          • memory/4556-42-0x00000000019F0000-0x0000000001A00000-memory.dmp

            Filesize

            64KB

          • memory/4556-55-0x0000000007890000-0x0000000007897000-memory.dmp

            Filesize

            28KB

          • memory/4556-54-0x0000000007340000-0x000000000774B000-memory.dmp

            Filesize

            4.0MB

          • memory/4556-51-0x0000000007340000-0x000000000774B000-memory.dmp

            Filesize

            4.0MB

          • memory/4556-11-0x0000000000630000-0x0000000000645000-memory.dmp

            Filesize

            84KB

          • memory/4556-15-0x0000000000630000-0x0000000000645000-memory.dmp

            Filesize

            84KB

          • memory/4556-50-0x00000000027F0000-0x00000000027F5000-memory.dmp

            Filesize

            20KB

          • memory/4556-17-0x0000000000630000-0x0000000000645000-memory.dmp

            Filesize

            84KB

          • memory/4556-19-0x0000000000630000-0x0000000000645000-memory.dmp

            Filesize

            84KB

          • memory/4556-20-0x0000000002200000-0x000000000240F000-memory.dmp

            Filesize

            2.1MB

          • memory/4556-23-0x0000000002200000-0x000000000240F000-memory.dmp

            Filesize

            2.1MB

          • memory/4556-24-0x00000000019E0000-0x00000000019E6000-memory.dmp

            Filesize

            24KB

          • memory/4556-27-0x00000000019F0000-0x0000000001A00000-memory.dmp

            Filesize

            64KB

          • memory/4556-30-0x00000000019F0000-0x0000000001A00000-memory.dmp

            Filesize

            64KB

          • memory/4556-31-0x00000000019F0000-0x0000000001A00000-memory.dmp

            Filesize

            64KB

          • memory/4556-33-0x00000000019F0000-0x0000000001A00000-memory.dmp

            Filesize

            64KB

          • memory/4556-47-0x00000000027F0000-0x00000000027F5000-memory.dmp

            Filesize

            20KB

          • memory/4556-46-0x00000000019F0000-0x0000000001A00000-memory.dmp

            Filesize

            64KB

          • memory/4556-35-0x00000000019F0000-0x0000000001A00000-memory.dmp

            Filesize

            64KB

          • memory/4556-36-0x00000000019F0000-0x0000000001A00000-memory.dmp

            Filesize

            64KB

          • memory/4556-37-0x00000000019F0000-0x0000000001A00000-memory.dmp

            Filesize

            64KB

          • memory/4556-38-0x00000000019F0000-0x0000000001A00000-memory.dmp

            Filesize

            64KB

          • memory/4556-39-0x00000000019F0000-0x0000000001A00000-memory.dmp

            Filesize

            64KB

          • memory/4556-40-0x00000000019F0000-0x0000000001A00000-memory.dmp

            Filesize

            64KB

          • memory/4556-45-0x00000000019F0000-0x0000000001A00000-memory.dmp

            Filesize

            64KB

          • memory/4556-41-0x00000000019F0000-0x0000000001A00000-memory.dmp

            Filesize

            64KB

          • memory/4556-43-0x00000000019F0000-0x0000000001A00000-memory.dmp

            Filesize

            64KB

          • memory/4556-34-0x00000000019F0000-0x0000000001A00000-memory.dmp

            Filesize

            64KB

          • memory/4556-44-0x00000000019F0000-0x0000000001A00000-memory.dmp

            Filesize

            64KB

          • memory/4764-0-0x0000000002190000-0x00000000021A5000-memory.dmp

            Filesize

            84KB

          • memory/4764-6-0x0000000000400000-0x0000000000447000-memory.dmp

            Filesize

            284KB

          • memory/4764-1-0x00000000021B0000-0x00000000021C3000-memory.dmp

            Filesize

            76KB

          • memory/4764-2-0x0000000000400000-0x0000000000447000-memory.dmp

            Filesize

            284KB

          • memory/4764-9-0x00000000021B0000-0x00000000021C3000-memory.dmp

            Filesize

            76KB

          • memory/4764-8-0x0000000002190000-0x00000000021A5000-memory.dmp

            Filesize

            84KB