Analysis

  • max time kernel
    147s
  • max time network
    154s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230915-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230915-enlocale:en-usos:windows10-2004-x64system
  • submitted
    05/10/2023, 19:31

General

  • Target

    file.exe

  • Size

    191KB

  • MD5

    170aa66f5331dc87707f0d7a405a45f0

  • SHA1

    5390a4d9e516c05bad7c86b3415c5fd53e0fb9c1

  • SHA256

    539e5470f3745740167fc0db04324c128470e822bddd7dfb7814dd27c60b1a03

  • SHA512

    d9d36a77d974a016bf7742734f5fae1ca85e0c9ed38ab48eb4f1743a27530f75309d38ebf9c83b0a2f6ff41113119f816baf4f0fe2d8ae156cad950ed2a65ef6

  • SSDEEP

    3072:mN/si5hMdfxA468QwBxt3YNL6tROXsEvoOEQ045Z2UvSNH5ju:GsPfxJ6mBx+SRUvvoOEQ04xvSf

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\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:5044
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\vmczmej\
      2⤵
        PID:2264
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\aqmbwomu.exe" C:\Windows\SysWOW64\vmczmej\
        2⤵
          PID:4284
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create vmczmej binPath= "C:\Windows\SysWOW64\vmczmej\aqmbwomu.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1476
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description vmczmej "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2092
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start vmczmej
          2⤵
          • Launches sc.exe
          PID:4732
        • 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:2620
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 5044 -s 1136
          2⤵
          • Program crash
          PID:1648
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 476 -p 5044 -ip 5044
        1⤵
          PID:3644
        • C:\Windows\SysWOW64\vmczmej\aqmbwomu.exe
          C:\Windows\SysWOW64\vmczmej\aqmbwomu.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
          1⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious use of WriteProcessMemory
          PID:2388
          • 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:5060
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 2388 -s 376
            2⤵
            • Program crash
            PID:4276
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 492 -p 2388 -ip 2388
          1⤵
            PID:2052

          Network

                MITRE ATT&CK Enterprise v15

                Replay Monitor

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                Downloads

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

                  Filesize

                  12.0MB

                  MD5

                  ac7832a4f6c18aa35634557d4148032b

                  SHA1

                  25fdc1879128e8d91853e1a2e88b10028aea23af

                  SHA256

                  78dcf56495c650b8ee78165b5ce3ac112f6517b66002f499502dbfda1fd79315

                  SHA512

                  c93746a793d59660700a3a9df38858e8418d91582cb7c954f0c33bc7e78eb46e930910abbfb692f481eaf53846d5ceb3258c7130e1f3eab6f594facec0f6b9e6

                • C:\Windows\SysWOW64\vmczmej\aqmbwomu.exe

                  Filesize

                  12.0MB

                  MD5

                  ac7832a4f6c18aa35634557d4148032b

                  SHA1

                  25fdc1879128e8d91853e1a2e88b10028aea23af

                  SHA256

                  78dcf56495c650b8ee78165b5ce3ac112f6517b66002f499502dbfda1fd79315

                  SHA512

                  c93746a793d59660700a3a9df38858e8418d91582cb7c954f0c33bc7e78eb46e930910abbfb692f481eaf53846d5ceb3258c7130e1f3eab6f594facec0f6b9e6

                • memory/2388-18-0x0000000000400000-0x00000000005A7000-memory.dmp

                  Filesize

                  1.7MB

                • memory/2388-11-0x00000000007A0000-0x00000000008A0000-memory.dmp

                  Filesize

                  1024KB

                • memory/2388-12-0x0000000000400000-0x00000000005A7000-memory.dmp

                  Filesize

                  1.7MB

                • memory/5044-2-0x00000000022F0000-0x0000000002303000-memory.dmp

                  Filesize

                  76KB

                • memory/5044-3-0x0000000000400000-0x00000000005A7000-memory.dmp

                  Filesize

                  1.7MB

                • memory/5044-7-0x00000000006A0000-0x00000000007A0000-memory.dmp

                  Filesize

                  1024KB

                • memory/5044-9-0x00000000022F0000-0x0000000002303000-memory.dmp

                  Filesize

                  76KB

                • memory/5044-10-0x0000000000400000-0x00000000005A7000-memory.dmp

                  Filesize

                  1.7MB

                • memory/5044-1-0x00000000006A0000-0x00000000007A0000-memory.dmp

                  Filesize

                  1024KB

                • memory/5060-32-0x0000000002780000-0x0000000002790000-memory.dmp

                  Filesize

                  64KB

                • memory/5060-48-0x0000000002780000-0x0000000002790000-memory.dmp

                  Filesize

                  64KB

                • memory/5060-19-0x00000000012C0000-0x00000000012D5000-memory.dmp

                  Filesize

                  84KB

                • memory/5060-21-0x00000000012C0000-0x00000000012D5000-memory.dmp

                  Filesize

                  84KB

                • memory/5060-22-0x0000000003000000-0x000000000320F000-memory.dmp

                  Filesize

                  2.1MB

                • memory/5060-26-0x0000000002770000-0x0000000002776000-memory.dmp

                  Filesize

                  24KB

                • memory/5060-25-0x0000000003000000-0x000000000320F000-memory.dmp

                  Filesize

                  2.1MB

                • memory/5060-29-0x0000000002780000-0x0000000002790000-memory.dmp

                  Filesize

                  64KB

                • memory/5060-33-0x0000000002780000-0x0000000002790000-memory.dmp

                  Filesize

                  64KB

                • memory/5060-13-0x00000000012C0000-0x00000000012D5000-memory.dmp

                  Filesize

                  84KB

                • memory/5060-34-0x0000000002780000-0x0000000002790000-memory.dmp

                  Filesize

                  64KB

                • memory/5060-38-0x0000000002780000-0x0000000002790000-memory.dmp

                  Filesize

                  64KB

                • memory/5060-41-0x0000000002780000-0x0000000002790000-memory.dmp

                  Filesize

                  64KB

                • memory/5060-40-0x0000000002780000-0x0000000002790000-memory.dmp

                  Filesize

                  64KB

                • memory/5060-43-0x0000000002780000-0x0000000002790000-memory.dmp

                  Filesize

                  64KB

                • memory/5060-17-0x00000000012C0000-0x00000000012D5000-memory.dmp

                  Filesize

                  84KB

                • memory/5060-47-0x0000000002780000-0x0000000002790000-memory.dmp

                  Filesize

                  64KB

                • memory/5060-49-0x00000000027D0000-0x00000000027D5000-memory.dmp

                  Filesize

                  20KB

                • memory/5060-52-0x00000000027D0000-0x00000000027D5000-memory.dmp

                  Filesize

                  20KB

                • memory/5060-53-0x0000000007F00000-0x000000000830B000-memory.dmp

                  Filesize

                  4.0MB

                • memory/5060-46-0x0000000002780000-0x0000000002790000-memory.dmp

                  Filesize

                  64KB

                • memory/5060-45-0x0000000002780000-0x0000000002790000-memory.dmp

                  Filesize

                  64KB

                • memory/5060-44-0x0000000002780000-0x0000000002790000-memory.dmp

                  Filesize

                  64KB

                • memory/5060-42-0x0000000002780000-0x0000000002790000-memory.dmp

                  Filesize

                  64KB

                • memory/5060-56-0x0000000007F00000-0x000000000830B000-memory.dmp

                  Filesize

                  4.0MB

                • memory/5060-57-0x00000000027E0000-0x00000000027E7000-memory.dmp

                  Filesize

                  28KB

                • memory/5060-39-0x0000000002780000-0x0000000002790000-memory.dmp

                  Filesize

                  64KB

                • memory/5060-37-0x0000000002780000-0x0000000002790000-memory.dmp

                  Filesize

                  64KB

                • memory/5060-36-0x0000000002780000-0x0000000002790000-memory.dmp

                  Filesize

                  64KB

                • memory/5060-35-0x0000000002780000-0x0000000002790000-memory.dmp

                  Filesize

                  64KB