Analysis

  • max time kernel
    150s
  • max time network
    155s
  • 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, 13:33

General

  • Target
    9f88f8dba6df3a1116c8444e9b03812fcadf4d8bf9f67d6cfcfb42eaae819e70.exe
  • Size 299KB
  • Sample240417-qtx4fsbc6w
  • SHA256 9f88f8dba6df3a1116c8444e9b03812fcadf4d8bf9f67d6cfcfb42eaae819e70
  • 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 6 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\9f88f8dba6df3a1116c8444e9b03812fcadf4d8bf9f67d6cfcfb42eaae819e70.exe
    "C:\Users\Admin\AppData\Local\Temp\9f88f8dba6df3a1116c8444e9b03812fcadf4d8bf9f67d6cfcfb42eaae819e70.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4988
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\yitpnpar\
      2⤵
        PID:2680
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\fmpkjddx.exe" C:\Windows\SysWOW64\yitpnpar\
        2⤵
          PID:5052
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create yitpnpar binPath= "C:\Windows\SysWOW64\yitpnpar\fmpkjddx.exe /d\"C:\Users\Admin\AppData\Local\Temp\9f88f8dba6df3a1116c8444e9b03812fcadf4d8bf9f67d6cfcfb42eaae819e70.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3272
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description yitpnpar "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4928
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start yitpnpar
          2⤵
          • Launches sc.exe
          PID:3076
        • 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:3312
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4988 -s 812
          2⤵
          • Program crash
          PID:4528
      • C:\Windows\SysWOW64\yitpnpar\fmpkjddx.exe
        C:\Windows\SysWOW64\yitpnpar\fmpkjddx.exe /d"C:\Users\Admin\AppData\Local\Temp\9f88f8dba6df3a1116c8444e9b03812fcadf4d8bf9f67d6cfcfb42eaae819e70.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4004
        • 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:2080
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4004 -s 536
          2⤵
          • Program crash
          PID:1296
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 4988 -ip 4988
        1⤵
          PID:1268
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 468 -p 4004 -ip 4004
          1⤵
            PID:4040

          Network

                MITRE ATT&CK Enterprise v15

                Replay Monitor

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                Downloads

                fmpkjddx.exe

                • Path C:\Users\Admin\AppData\Local\Temp\fmpkjddx.exe
                • Size 12.1MB
                • SHA256 300a0c8008fe5370161f9ffd44609e1e436d98980b5d631755ee93e8d1696ca4
                • MD5 SHA1 SHA512 SSDEEP

                memory/2080-42-0x00000000021F0000-0x0000000002200000-memory.dmp

                memory/2080-43-0x00000000021F0000-0x0000000002200000-memory.dmp

                memory/2080-57-0x0000000002FE0000-0x0000000002FE7000-memory.dmp

                memory/2080-56-0x0000000007A40000-0x0000000007E4B000-memory.dmp

                memory/2080-53-0x0000000007A40000-0x0000000007E4B000-memory.dmp

                memory/2080-52-0x0000000002FD0000-0x0000000002FD5000-memory.dmp

                memory/2080-49-0x0000000002FD0000-0x0000000002FD5000-memory.dmp

                memory/2080-12-0x0000000000B40000-0x0000000000B55000-memory.dmp

                memory/2080-15-0x0000000000B40000-0x0000000000B55000-memory.dmp

                memory/2080-48-0x00000000021F0000-0x0000000002200000-memory.dmp

                memory/2080-47-0x00000000021F0000-0x0000000002200000-memory.dmp

                memory/2080-18-0x0000000000B40000-0x0000000000B55000-memory.dmp

                memory/2080-19-0x0000000000B40000-0x0000000000B55000-memory.dmp

                memory/2080-20-0x0000000000B40000-0x0000000000B55000-memory.dmp

                memory/2080-32-0x00000000021F0000-0x0000000002200000-memory.dmp

                memory/2080-25-0x0000000002A00000-0x0000000002C0F000-memory.dmp

                memory/2080-26-0x0000000000BF0000-0x0000000000BF6000-memory.dmp

                memory/2080-29-0x00000000021F0000-0x0000000002200000-memory.dmp

                memory/2080-46-0x00000000021F0000-0x0000000002200000-memory.dmp

                memory/2080-22-0x0000000002A00000-0x0000000002C0F000-memory.dmp

                memory/2080-39-0x00000000021F0000-0x0000000002200000-memory.dmp

                memory/2080-35-0x00000000021F0000-0x0000000002200000-memory.dmp

                memory/2080-36-0x00000000021F0000-0x0000000002200000-memory.dmp

                memory/2080-37-0x00000000021F0000-0x0000000002200000-memory.dmp

                memory/2080-38-0x00000000021F0000-0x0000000002200000-memory.dmp

                memory/2080-34-0x00000000021F0000-0x0000000002200000-memory.dmp

                memory/2080-40-0x00000000021F0000-0x0000000002200000-memory.dmp

                memory/2080-41-0x00000000021F0000-0x0000000002200000-memory.dmp

                memory/2080-33-0x00000000021F0000-0x0000000002200000-memory.dmp

                memory/2080-45-0x00000000021F0000-0x0000000002200000-memory.dmp

                memory/2080-44-0x00000000021F0000-0x0000000002200000-memory.dmp

                memory/4004-16-0x0000000000400000-0x000000000086C000-memory.dmp

                memory/4004-11-0x0000000000400000-0x000000000086C000-memory.dmp

                memory/4004-10-0x0000000000970000-0x0000000000983000-memory.dmp

                memory/4004-9-0x0000000000AD0000-0x0000000000BD0000-memory.dmp

                memory/4988-1-0x0000000000B80000-0x0000000000C80000-memory.dmp

                memory/4988-4-0x0000000000400000-0x000000000086C000-memory.dmp

                memory/4988-17-0x0000000000400000-0x000000000086C000-memory.dmp

                memory/4988-7-0x0000000000400000-0x000000000086C000-memory.dmp

                memory/4988-2-0x0000000000B00000-0x0000000000B13000-memory.dmp