Analysis

  • max time kernel
    149s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240412-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240412-enlocale:en-usos:windows10-2004-x64system
  • submitted
    17/04/2024, 13:34

General

  • Target
    d171d38b6205dd0a4b69004e182eb2d5bfaa7f97fff4aa622c491f383833de03.exe
  • Size 298KB
  • Sample240417-qt23eabc7x
  • SHA256 d171d38b6205dd0a4b69004e182eb2d5bfaa7f97fff4aa622c491f383833de03
  • MD5 SHA1 SHA512 SSDEEP

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 2 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
  • Modifies data under HKEY_USERS 3 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\d171d38b6205dd0a4b69004e182eb2d5bfaa7f97fff4aa622c491f383833de03.exe
    "C:\Users\Admin\AppData\Local\Temp\d171d38b6205dd0a4b69004e182eb2d5bfaa7f97fff4aa622c491f383833de03.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:372
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\glxyexqx\
      2⤵
        PID:3384
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\pbresrjn.exe" C:\Windows\SysWOW64\glxyexqx\
        2⤵
          PID:3032
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create glxyexqx binPath= "C:\Windows\SysWOW64\glxyexqx\pbresrjn.exe /d\"C:\Users\Admin\AppData\Local\Temp\d171d38b6205dd0a4b69004e182eb2d5bfaa7f97fff4aa622c491f383833de03.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4512
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description glxyexqx "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4384
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start glxyexqx
          2⤵
          • Launches sc.exe
          PID:4940
        • 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:3908
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 372 -s 1036
          2⤵
          • Program crash
          PID:4924
      • C:\Windows\SysWOW64\glxyexqx\pbresrjn.exe
        C:\Windows\SysWOW64\glxyexqx\pbresrjn.exe /d"C:\Users\Admin\AppData\Local\Temp\d171d38b6205dd0a4b69004e182eb2d5bfaa7f97fff4aa622c491f383833de03.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2688
        • 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:2112
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2688 -s 520
          2⤵
          • Program crash
          PID:2228
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 372 -ip 372
        1⤵
          PID:4528
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 2688 -ip 2688
          1⤵
            PID:2792

          Network

                MITRE ATT&CK Enterprise v15

                Replay Monitor

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                Downloads

                pbresrjn.exe

                • Path C:\Users\Admin\AppData\Local\Temp\pbresrjn.exe
                • Size 14.3MB
                • SHA256 c847597356e8c4813f05f83fac6903d88ec7814f129a1a6d263a44a3d004c1e2
                • MD5 SHA1 SHA512 SSDEEP

                memory/372-1-0x00000000009A0000-0x0000000000AA0000-memory.dmp

                memory/372-2-0x0000000000980000-0x0000000000993000-memory.dmp

                memory/372-4-0x0000000000400000-0x00000000007D3000-memory.dmp

                memory/372-7-0x0000000000400000-0x00000000007D3000-memory.dmp

                memory/372-8-0x0000000000980000-0x0000000000993000-memory.dmp

                memory/2112-15-0x0000000000E00000-0x0000000000E15000-memory.dmp

                memory/2112-12-0x0000000000E00000-0x0000000000E15000-memory.dmp

                memory/2112-16-0x0000000000E00000-0x0000000000E15000-memory.dmp

                memory/2112-19-0x0000000000E00000-0x0000000000E15000-memory.dmp

                memory/2688-11-0x0000000000400000-0x00000000007D3000-memory.dmp

                memory/2688-10-0x0000000000920000-0x0000000000A20000-memory.dmp

                memory/2688-17-0x0000000000400000-0x00000000007D3000-memory.dmp