Analysis

  • max time kernel
    151s
  • max time network
    162s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231020-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231020-enlocale:en-usos:windows10-2004-x64system
  • submitted
    19/11/2023, 23:33

General

  • Target

    7e9ccdf57f7fe03c9e2efd738b6490aabed53615f70a101a8c1cd008716fa6d2.exe

  • Size

    338KB

  • MD5

    5c5387efb7f70cd46012c6f8f4cc0e1a

  • SHA1

    c2ad2a7be652d8b73cdeb794b498c03d8f783bc4

  • SHA256

    7e9ccdf57f7fe03c9e2efd738b6490aabed53615f70a101a8c1cd008716fa6d2

  • SHA512

    bc6a38573e87fc6bc7b945ee76f5b8102e5adfa1ff6262356212a0fb66f2b4cb071193df75f05da715627d1d4c5cb2cd733f786371bf271e5ee94f88557de65d

  • SSDEEP

    3072:M9xApN8qo8I+HI0C+iUn9wYaA8MqfvJLAiT12Rerybp80C:wTqoQHIbYatRJLAiT3ry3

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.

  • 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
  • GoLang User-Agent 2 IoCs

    Uses default user-agent string defined by GoLang HTTP packages.

  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\7e9ccdf57f7fe03c9e2efd738b6490aabed53615f70a101a8c1cd008716fa6d2.exe
    "C:\Users\Admin\AppData\Local\Temp\7e9ccdf57f7fe03c9e2efd738b6490aabed53615f70a101a8c1cd008716fa6d2.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4440
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\wuipwuol\
      2⤵
        PID:4016
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\bkqbzog.exe" C:\Windows\SysWOW64\wuipwuol\
        2⤵
          PID:2208
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create wuipwuol binPath= "C:\Windows\SysWOW64\wuipwuol\bkqbzog.exe /d\"C:\Users\Admin\AppData\Local\Temp\7e9ccdf57f7fe03c9e2efd738b6490aabed53615f70a101a8c1cd008716fa6d2.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4032
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description wuipwuol "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4436
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start wuipwuol
          2⤵
          • Launches sc.exe
          PID:348
        • 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:3464
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4440 -s 656
          2⤵
          • Program crash
          PID:3420
      • C:\Windows\SysWOW64\wuipwuol\bkqbzog.exe
        C:\Windows\SysWOW64\wuipwuol\bkqbzog.exe /d"C:\Users\Admin\AppData\Local\Temp\7e9ccdf57f7fe03c9e2efd738b6490aabed53615f70a101a8c1cd008716fa6d2.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4072
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4072 -s 536
          2⤵
          • Program crash
          PID:2788
        • 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:3460
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 4440 -ip 4440
        1⤵
          PID:1836
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 556 -p 4072 -ip 4072
          1⤵
            PID:4892

          Network

                MITRE ATT&CK Enterprise v15

                Replay Monitor

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                Downloads

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

                  Filesize

                  14.6MB

                  MD5

                  a38686ebcc5c7554100a42ef4eec72e0

                  SHA1

                  2b8af52240173f032ef4b0d292eeacf5a35c5b23

                  SHA256

                  85beb0a0a3ef23685227c8bb1149b6885729137ac8da9e4186a2831a6ee01de3

                  SHA512

                  8c81cce431dc1c7860248281898dfa424784780dc48f3ef27ec1d49743ade7f60c1a73b7f10a0d9148a230e334c0300d9c0a5072b26c5c641ce21f33e3164c93

                • C:\Windows\SysWOW64\wuipwuol\bkqbzog.exe

                  Filesize

                  14.6MB

                  MD5

                  a38686ebcc5c7554100a42ef4eec72e0

                  SHA1

                  2b8af52240173f032ef4b0d292eeacf5a35c5b23

                  SHA256

                  85beb0a0a3ef23685227c8bb1149b6885729137ac8da9e4186a2831a6ee01de3

                  SHA512

                  8c81cce431dc1c7860248281898dfa424784780dc48f3ef27ec1d49743ade7f60c1a73b7f10a0d9148a230e334c0300d9c0a5072b26c5c641ce21f33e3164c93

                • memory/3460-44-0x00000000021E0000-0x00000000021F0000-memory.dmp

                  Filesize

                  64KB

                • memory/3460-30-0x00000000021E0000-0x00000000021F0000-memory.dmp

                  Filesize

                  64KB

                • memory/3460-59-0x0000000000E60000-0x0000000000E75000-memory.dmp

                  Filesize

                  84KB

                • memory/3460-34-0x00000000021E0000-0x00000000021F0000-memory.dmp

                  Filesize

                  64KB

                • memory/3460-36-0x00000000021E0000-0x00000000021F0000-memory.dmp

                  Filesize

                  64KB

                • memory/3460-55-0x0000000002FD0000-0x0000000002FD7000-memory.dmp

                  Filesize

                  28KB

                • memory/3460-16-0x0000000000E60000-0x0000000000E75000-memory.dmp

                  Filesize

                  84KB

                • memory/3460-11-0x0000000000E60000-0x0000000000E75000-memory.dmp

                  Filesize

                  84KB

                • memory/3460-38-0x00000000021E0000-0x00000000021F0000-memory.dmp

                  Filesize

                  64KB

                • memory/3460-37-0x00000000021E0000-0x00000000021F0000-memory.dmp

                  Filesize

                  64KB

                • memory/3460-33-0x00000000021E0000-0x00000000021F0000-memory.dmp

                  Filesize

                  64KB

                • memory/3460-20-0x0000000002A00000-0x0000000002C0F000-memory.dmp

                  Filesize

                  2.1MB

                • memory/3460-23-0x0000000002A00000-0x0000000002C0F000-memory.dmp

                  Filesize

                  2.1MB

                • memory/3460-24-0x0000000000FF0000-0x0000000000FF6000-memory.dmp

                  Filesize

                  24KB

                • memory/3460-27-0x00000000021E0000-0x00000000021F0000-memory.dmp

                  Filesize

                  64KB

                • memory/3460-40-0x00000000021E0000-0x00000000021F0000-memory.dmp

                  Filesize

                  64KB

                • memory/3460-31-0x00000000021E0000-0x00000000021F0000-memory.dmp

                  Filesize

                  64KB

                • memory/3460-32-0x00000000021E0000-0x00000000021F0000-memory.dmp

                  Filesize

                  64KB

                • memory/3460-54-0x0000000007A40000-0x0000000007E4B000-memory.dmp

                  Filesize

                  4.0MB

                • memory/3460-35-0x00000000021E0000-0x00000000021F0000-memory.dmp

                  Filesize

                  64KB

                • memory/3460-18-0x0000000000E60000-0x0000000000E75000-memory.dmp

                  Filesize

                  84KB

                • memory/3460-42-0x00000000021E0000-0x00000000021F0000-memory.dmp

                  Filesize

                  64KB

                • memory/3460-43-0x00000000021E0000-0x00000000021F0000-memory.dmp

                  Filesize

                  64KB

                • memory/3460-47-0x00000000021F0000-0x00000000021F5000-memory.dmp

                  Filesize

                  20KB

                • memory/3460-45-0x00000000021E0000-0x00000000021F0000-memory.dmp

                  Filesize

                  64KB

                • memory/3460-50-0x00000000021F0000-0x00000000021F5000-memory.dmp

                  Filesize

                  20KB

                • memory/3460-46-0x00000000021E0000-0x00000000021F0000-memory.dmp

                  Filesize

                  64KB

                • memory/3460-51-0x0000000007A40000-0x0000000007E4B000-memory.dmp

                  Filesize

                  4.0MB

                • memory/3460-39-0x00000000021E0000-0x00000000021F0000-memory.dmp

                  Filesize

                  64KB

                • memory/3460-41-0x00000000021E0000-0x00000000021F0000-memory.dmp

                  Filesize

                  64KB

                • memory/4072-17-0x0000000000400000-0x000000000089D000-memory.dmp

                  Filesize

                  4.6MB

                • memory/4072-10-0x0000000000A60000-0x0000000000B60000-memory.dmp

                  Filesize

                  1024KB

                • memory/4072-12-0x0000000000400000-0x000000000089D000-memory.dmp

                  Filesize

                  4.6MB

                • memory/4440-1-0x00000000009E0000-0x0000000000AE0000-memory.dmp

                  Filesize

                  1024KB

                • memory/4440-4-0x0000000000400000-0x000000000089D000-memory.dmp

                  Filesize

                  4.6MB

                • memory/4440-8-0x0000000000940000-0x0000000000953000-memory.dmp

                  Filesize

                  76KB

                • memory/4440-7-0x0000000000400000-0x000000000089D000-memory.dmp

                  Filesize

                  4.6MB

                • memory/4440-2-0x0000000000940000-0x0000000000953000-memory.dmp

                  Filesize

                  76KB