Analysis

  • max time kernel
    147s
  • max time network
    156s
  • 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, 13:32

General

  • Target
    e3cb143065ee2414007182694ceedcba541b748825eeae851eb395a24bd08053.exe
  • Size 312KB
  • Sample240417-qtgfpshf73
  • SHA256 e3cb143065ee2414007182694ceedcba541b748825eeae851eb395a24bd08053
  • 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\e3cb143065ee2414007182694ceedcba541b748825eeae851eb395a24bd08053.exe
    "C:\Users\Admin\AppData\Local\Temp\e3cb143065ee2414007182694ceedcba541b748825eeae851eb395a24bd08053.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:2724
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\softoyzg\
      2⤵
        PID:3400
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\pjomhkhj.exe" C:\Windows\SysWOW64\softoyzg\
        2⤵
          PID:3468
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create softoyzg binPath= "C:\Windows\SysWOW64\softoyzg\pjomhkhj.exe /d\"C:\Users\Admin\AppData\Local\Temp\e3cb143065ee2414007182694ceedcba541b748825eeae851eb395a24bd08053.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4372
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description softoyzg "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3556
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start softoyzg
          2⤵
          • Launches sc.exe
          PID:1924
        • 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:2140
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2724 -s 1188
          2⤵
          • Program crash
          PID:2332
      • C:\Windows\SysWOW64\softoyzg\pjomhkhj.exe
        C:\Windows\SysWOW64\softoyzg\pjomhkhj.exe /d"C:\Users\Admin\AppData\Local\Temp\e3cb143065ee2414007182694ceedcba541b748825eeae851eb395a24bd08053.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4864
        • 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:1856
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4864 -s 536
          2⤵
          • Program crash
          PID:3392
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 2724 -ip 2724
        1⤵
          PID:4244
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 532 -p 4864 -ip 4864
          1⤵
            PID:1580

          Network

                MITRE ATT&CK Enterprise v15

                Replay Monitor

                Loading Replay Monitor...

                Downloads

                pjomhkhj.exe

                • Path C:\Users\Admin\AppData\Local\Temp\pjomhkhj.exe
                • Size 12.4MB
                • SHA256 115a24777972790f007b238a3c62b6e598e0ead2708f49583925216713a1e59d
                • MD5 SHA1 SHA512 SSDEEP

                memory/1856-16-0x0000000000880000-0x0000000000895000-memory.dmp

                memory/1856-12-0x0000000000880000-0x0000000000895000-memory.dmp

                memory/1856-18-0x0000000000880000-0x0000000000895000-memory.dmp

                memory/1856-20-0x0000000000880000-0x0000000000895000-memory.dmp

                memory/2724-4-0x0000000000400000-0x00000000007D7000-memory.dmp

                memory/2724-2-0x0000000000970000-0x0000000000983000-memory.dmp

                memory/2724-7-0x0000000000400000-0x00000000007D7000-memory.dmp

                memory/2724-8-0x0000000000970000-0x0000000000983000-memory.dmp

                memory/2724-1-0x0000000000A30000-0x0000000000B30000-memory.dmp

                memory/4864-10-0x0000000000970000-0x0000000000A70000-memory.dmp

                memory/4864-11-0x0000000000400000-0x00000000007D7000-memory.dmp

                memory/4864-17-0x0000000000400000-0x00000000007D7000-memory.dmp