Analysis

  • max time kernel
    150s
  • max time network
    157s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230915-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230915-enlocale:en-usos:windows10-2004-x64system
  • submitted
    12/10/2023, 12:10

General

  • Target

    file.exe

  • Size

    263KB

  • MD5

    4ebce96bc30f2e908aeceb841493059f

  • SHA1

    843e4e7b409d795ae93018a84cd223c844f7fa61

  • SHA256

    917bd9659af008782d039354a7e4404d075d444ba7c54f50bcb3c7cbe79c63f4

  • SHA512

    2b68299fbc20a01b51a9770aef637f15e9ea4420a0f2acbfdd377c241f0df3a7dd0cd2e2a5fd5e1067763ea606d47ce3a7db8f67e136b4e37598d68ce107f127

  • SSDEEP

    6144:6hbnS4HJdQtvKQ0u40sGlJgNkipt6pas:UbS4pdQtvKt5XEKKiT

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
  • 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 5 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:4484
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\susrsuuo\
      2⤵
        PID:996
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\eqgthgyc.exe" C:\Windows\SysWOW64\susrsuuo\
        2⤵
          PID:4872
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create susrsuuo binPath= "C:\Windows\SysWOW64\susrsuuo\eqgthgyc.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3992
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description susrsuuo "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1680
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start susrsuuo
          2⤵
          • Launches sc.exe
          PID:1324
        • 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:4800
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4484 -s 1200
          2⤵
          • Program crash
          PID:3060
      • C:\Windows\SysWOW64\susrsuuo\eqgthgyc.exe
        C:\Windows\SysWOW64\susrsuuo\eqgthgyc.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4000
        • 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:5024
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4000 -s 516
          2⤵
          • Program crash
          PID:1532
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 464 -p 4484 -ip 4484
        1⤵
          PID:4472
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 556 -p 4000 -ip 4000
          1⤵
            PID:5076

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

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

            Filesize

            11.6MB

            MD5

            1e986c3e3f3642a26af24ab582e78b7f

            SHA1

            2d4854f6e6c45232f18008992349ac6d0c6fd744

            SHA256

            7ccd171f6b40f7fe9f8d324e3b1e6abfb236915fb5f9e4bae191a1bc6ba6488a

            SHA512

            a23b7b35f7d6ad79dfb83e7631113126557ad3f0ce1abac6ee5ca83ec098726ddde2ebc693a79ad6fc9d58208b5e8d97970ce079d9705b5f16ea4cbbd0e70183

          • C:\Windows\SysWOW64\susrsuuo\eqgthgyc.exe

            Filesize

            11.6MB

            MD5

            1e986c3e3f3642a26af24ab582e78b7f

            SHA1

            2d4854f6e6c45232f18008992349ac6d0c6fd744

            SHA256

            7ccd171f6b40f7fe9f8d324e3b1e6abfb236915fb5f9e4bae191a1bc6ba6488a

            SHA512

            a23b7b35f7d6ad79dfb83e7631113126557ad3f0ce1abac6ee5ca83ec098726ddde2ebc693a79ad6fc9d58208b5e8d97970ce079d9705b5f16ea4cbbd0e70183

          • memory/4000-17-0x0000000000400000-0x0000000000710000-memory.dmp

            Filesize

            3.1MB

          • memory/4000-8-0x0000000000A20000-0x0000000000B20000-memory.dmp

            Filesize

            1024KB

          • memory/4000-13-0x0000000000400000-0x0000000000710000-memory.dmp

            Filesize

            3.1MB

          • memory/4484-1-0x00000000009B0000-0x0000000000AB0000-memory.dmp

            Filesize

            1024KB

          • memory/4484-4-0x0000000000400000-0x0000000000710000-memory.dmp

            Filesize

            3.1MB

          • memory/4484-2-0x0000000002450000-0x0000000002463000-memory.dmp

            Filesize

            76KB

          • memory/4484-10-0x0000000002450000-0x0000000002463000-memory.dmp

            Filesize

            76KB

          • memory/4484-9-0x00000000009B0000-0x0000000000AB0000-memory.dmp

            Filesize

            1024KB

          • memory/4484-16-0x0000000000400000-0x0000000000710000-memory.dmp

            Filesize

            3.1MB

          • memory/5024-33-0x0000000001210000-0x0000000001220000-memory.dmp

            Filesize

            64KB

          • memory/5024-38-0x0000000001210000-0x0000000001220000-memory.dmp

            Filesize

            64KB

          • memory/5024-18-0x0000000000A60000-0x0000000000A75000-memory.dmp

            Filesize

            84KB

          • memory/5024-19-0x0000000000A60000-0x0000000000A75000-memory.dmp

            Filesize

            84KB

          • memory/5024-20-0x0000000000A60000-0x0000000000A75000-memory.dmp

            Filesize

            84KB

          • memory/5024-22-0x0000000001000000-0x000000000120F000-memory.dmp

            Filesize

            2.1MB

          • memory/5024-25-0x0000000001000000-0x000000000120F000-memory.dmp

            Filesize

            2.1MB

          • memory/5024-26-0x0000000000BF0000-0x0000000000BF6000-memory.dmp

            Filesize

            24KB

          • memory/5024-29-0x0000000001210000-0x0000000001220000-memory.dmp

            Filesize

            64KB

          • memory/5024-11-0x0000000000A60000-0x0000000000A75000-memory.dmp

            Filesize

            84KB

          • memory/5024-32-0x0000000001210000-0x0000000001220000-memory.dmp

            Filesize

            64KB

          • memory/5024-34-0x0000000001210000-0x0000000001220000-memory.dmp

            Filesize

            64KB

          • memory/5024-35-0x0000000001210000-0x0000000001220000-memory.dmp

            Filesize

            64KB

          • memory/5024-36-0x0000000001210000-0x0000000001220000-memory.dmp

            Filesize

            64KB

          • memory/5024-37-0x0000000001210000-0x0000000001220000-memory.dmp

            Filesize

            64KB

          • memory/5024-15-0x0000000000A60000-0x0000000000A75000-memory.dmp

            Filesize

            84KB

          • memory/5024-39-0x0000000001210000-0x0000000001220000-memory.dmp

            Filesize

            64KB

          • memory/5024-40-0x0000000001210000-0x0000000001220000-memory.dmp

            Filesize

            64KB

          • memory/5024-42-0x0000000001210000-0x0000000001220000-memory.dmp

            Filesize

            64KB

          • memory/5024-41-0x0000000001210000-0x0000000001220000-memory.dmp

            Filesize

            64KB

          • memory/5024-44-0x0000000001210000-0x0000000001220000-memory.dmp

            Filesize

            64KB

          • memory/5024-43-0x0000000001210000-0x0000000001220000-memory.dmp

            Filesize

            64KB

          • memory/5024-45-0x0000000001210000-0x0000000001220000-memory.dmp

            Filesize

            64KB

          • memory/5024-46-0x0000000001210000-0x0000000001220000-memory.dmp

            Filesize

            64KB

          • memory/5024-47-0x0000000001210000-0x0000000001220000-memory.dmp

            Filesize

            64KB

          • memory/5024-48-0x0000000001210000-0x0000000001220000-memory.dmp

            Filesize

            64KB

          • memory/5024-49-0x0000000001220000-0x0000000001225000-memory.dmp

            Filesize

            20KB

          • memory/5024-52-0x0000000001220000-0x0000000001225000-memory.dmp

            Filesize

            20KB

          • memory/5024-53-0x0000000007780000-0x0000000007B8B000-memory.dmp

            Filesize

            4.0MB

          • memory/5024-56-0x0000000007780000-0x0000000007B8B000-memory.dmp

            Filesize

            4.0MB

          • memory/5024-57-0x0000000001230000-0x0000000001237000-memory.dmp

            Filesize

            28KB