Analysis

  • max time kernel
    138s
  • max time network
    149s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231023-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231023-enlocale:en-usos:windows10-2004-x64system
  • submitted
    19/11/2023, 22:26

General

  • Target

    21c38ebbea03aa2ddce570a40ebcbf10217b80b9dde4924ce7119fb13d260edb.exe

  • Size

    329KB

  • MD5

    c5acf32a68fc55104b5dafc61245bab4

  • SHA1

    8a1d49efbb20a987cd87d227c4c4016a36c76afb

  • SHA256

    21c38ebbea03aa2ddce570a40ebcbf10217b80b9dde4924ce7119fb13d260edb

  • SHA512

    8bc262803139c0420b71ffea63e772124446349d913bb194646c22f0d4dca0cd04d3a3108032c2f31618f482e86fbfa0aa4de63d7c53fcd03dcc438763970808

  • SSDEEP

    3072:y9xdm7sMhs6Y28qryW6A4bdZc4nJcJW+XkmwVWf4rEVjSHwZROr4bpLkC:yIths6Y28ehy5nJcU6QrEVjWlr4a

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
  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Executes dropped EXE 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 1 IoCs
  • Suspicious use of WriteProcessMemory 18 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\21c38ebbea03aa2ddce570a40ebcbf10217b80b9dde4924ce7119fb13d260edb.exe
    "C:\Users\Admin\AppData\Local\Temp\21c38ebbea03aa2ddce570a40ebcbf10217b80b9dde4924ce7119fb13d260edb.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:1792
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\hgbsvvy\
      2⤵
        PID:1992
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ragrpew.exe" C:\Windows\SysWOW64\hgbsvvy\
        2⤵
          PID:1452
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create hgbsvvy binPath= "C:\Windows\SysWOW64\hgbsvvy\ragrpew.exe /d\"C:\Users\Admin\AppData\Local\Temp\21c38ebbea03aa2ddce570a40ebcbf10217b80b9dde4924ce7119fb13d260edb.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2100
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description hgbsvvy "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:856
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start hgbsvvy
          2⤵
          • Launches sc.exe
          PID:4040
        • 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:3552
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1792 -s 580
          2⤵
          • Program crash
          PID:3760
      • C:\Windows\SysWOW64\hgbsvvy\ragrpew.exe
        C:\Windows\SysWOW64\hgbsvvy\ragrpew.exe /d"C:\Users\Admin\AppData\Local\Temp\21c38ebbea03aa2ddce570a40ebcbf10217b80b9dde4924ce7119fb13d260edb.exe"
        1⤵
        • Executes dropped EXE
        PID:4956
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 1792 -ip 1792
        1⤵
          PID:4928

        Network

              MITRE ATT&CK Enterprise v15

              Replay Monitor

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              Downloads

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

                Filesize

                11.7MB

                MD5

                a4a7be2f76bf63ff67c436aaae269c96

                SHA1

                e1e3d6b653c3adf592549d30d09296d345a03eb3

                SHA256

                c2c70c4a076ef8130684ac24baab19ebbbacbd8ce8ee1ec91553967d1cd642f3

                SHA512

                cd4fcb53f9c454e16604b16738044d48bebce48b52f27b06b064d1b1e67d3cabc31b57d688750bcbe14833f1ef29c4e1e868c6fb845ba18257b8a320a93620db

              • C:\Windows\SysWOW64\hgbsvvy\ragrpew.exe

                Filesize

                11.7MB

                MD5

                a4a7be2f76bf63ff67c436aaae269c96

                SHA1

                e1e3d6b653c3adf592549d30d09296d345a03eb3

                SHA256

                c2c70c4a076ef8130684ac24baab19ebbbacbd8ce8ee1ec91553967d1cd642f3

                SHA512

                cd4fcb53f9c454e16604b16738044d48bebce48b52f27b06b064d1b1e67d3cabc31b57d688750bcbe14833f1ef29c4e1e868c6fb845ba18257b8a320a93620db

              • memory/1792-1-0x0000000000760000-0x0000000000860000-memory.dmp

                Filesize

                1024KB

              • memory/1792-2-0x00000000001C0000-0x00000000001D3000-memory.dmp

                Filesize

                76KB

              • memory/1792-3-0x0000000000400000-0x0000000000507000-memory.dmp

                Filesize

                1.0MB

              • memory/1792-7-0x0000000000400000-0x0000000000507000-memory.dmp

                Filesize

                1.0MB

              • memory/1792-8-0x00000000001C0000-0x00000000001D3000-memory.dmp

                Filesize

                76KB