Analysis

  • max time kernel
    150s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240611-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240611-enlocale:en-usos:windows10-2004-x64system
  • submitted
    20/06/2024, 08:29

General

  • Target
    0f3b00054eb936e4064cccf117770df301e571f94d6a84ab2b9e7313c35008ec.exe
  • Size 10.8MB
  • Sample240620-kdthfascnq
  • SHA256 0f3b00054eb936e4064cccf117770df301e571f94d6a84ab2b9e7313c35008ec
  • 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) 2 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).

  • Event Triggered Execution: Netsh Helper DLL 1 TTPs 3 IoCs

    Netsh.exe (also referred to as Netshell) is a command-line scripting utility used to interact with the network configuration of a system.

  • Program crash 2 IoCs
  • Modifies data under HKEY_USERS 6 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\0f3b00054eb936e4064cccf117770df301e571f94d6a84ab2b9e7313c35008ec.exe
    "C:\Users\Admin\AppData\Local\Temp\0f3b00054eb936e4064cccf117770df301e571f94d6a84ab2b9e7313c35008ec.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:1592
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\wlyryums\
      2⤵
        PID:2248
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\lszcrfyi.exe" C:\Windows\SysWOW64\wlyryums\
        2⤵
          PID:436
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create wlyryums binPath= "C:\Windows\SysWOW64\wlyryums\lszcrfyi.exe /d\"C:\Users\Admin\AppData\Local\Temp\0f3b00054eb936e4064cccf117770df301e571f94d6a84ab2b9e7313c35008ec.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4956
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description wlyryums "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1820
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start wlyryums
          2⤵
          • Launches sc.exe
          PID:4728
        • 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
          • Event Triggered Execution: Netsh Helper DLL
          PID:3780
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1592 -s 1236
          2⤵
          • Program crash
          PID:4272
      • C:\Windows\SysWOW64\wlyryums\lszcrfyi.exe
        C:\Windows\SysWOW64\wlyryums\lszcrfyi.exe /d"C:\Users\Admin\AppData\Local\Temp\0f3b00054eb936e4064cccf117770df301e571f94d6a84ab2b9e7313c35008ec.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3608
        • 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:3288
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3608 -s 520
          2⤵
          • Program crash
          PID:1348
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 472 -p 1592 -ip 1592
        1⤵
          PID:3644
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 496 -p 3608 -ip 3608
          1⤵
            PID:1700

          Network

                MITRE ATT&CK Enterprise v15

                Replay Monitor

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                Downloads

                lszcrfyi.exe

                • Path C:\Users\Admin\AppData\Local\Temp\lszcrfyi.exe
                • Size 10.5MB
                • SHA256 a30631fe36343461d4f21a2e72cb90538143ecb3e665e668c3c7fe75c6780c66
                • MD5 SHA1 SHA512 SSDEEP

                memory/1592-11-0x0000000000400000-0x00000000022EB000-memory.dmp

                memory/1592-2-0x0000000003EF0000-0x0000000003F03000-memory.dmp

                memory/1592-3-0x0000000000400000-0x0000000000415000-memory.dmp

                memory/1592-1-0x0000000002330000-0x0000000002430000-memory.dmp

                memory/1592-13-0x0000000000400000-0x0000000000415000-memory.dmp

                memory/1592-12-0x0000000003EF0000-0x0000000003F03000-memory.dmp

                memory/3288-40-0x0000000002360000-0x0000000002370000-memory.dmp

                memory/3288-37-0x0000000002360000-0x0000000002370000-memory.dmp

                memory/3288-14-0x0000000000DA0000-0x0000000000DB5000-memory.dmp

                memory/3288-15-0x0000000000DA0000-0x0000000000DB5000-memory.dmp

                memory/3288-49-0x0000000007B80000-0x0000000007F8B000-memory.dmp

                memory/3288-52-0x00000000031D0000-0x00000000031D7000-memory.dmp

                memory/3288-47-0x00000000023F0000-0x00000000023F5000-memory.dmp

                memory/3288-44-0x00000000023F0000-0x00000000023F5000-memory.dmp

                memory/3288-43-0x0000000002360000-0x0000000002370000-memory.dmp

                memory/3288-42-0x0000000002360000-0x0000000002370000-memory.dmp

                memory/3288-41-0x0000000002360000-0x0000000002370000-memory.dmp

                memory/3288-8-0x0000000000DA0000-0x0000000000DB5000-memory.dmp

                memory/3288-51-0x0000000007B80000-0x0000000007F8B000-memory.dmp

                memory/3288-39-0x0000000002360000-0x0000000002370000-memory.dmp

                memory/3288-38-0x0000000002360000-0x0000000002370000-memory.dmp

                memory/3288-20-0x0000000002C00000-0x0000000002E0F000-memory.dmp

                memory/3288-36-0x0000000002360000-0x0000000002370000-memory.dmp

                memory/3288-34-0x0000000002360000-0x0000000002370000-memory.dmp

                memory/3288-32-0x0000000002360000-0x0000000002370000-memory.dmp

                memory/3288-33-0x0000000002360000-0x0000000002370000-memory.dmp

                memory/3288-31-0x0000000002360000-0x0000000002370000-memory.dmp

                memory/3288-30-0x0000000002360000-0x0000000002370000-memory.dmp

                memory/3288-29-0x0000000002360000-0x0000000002370000-memory.dmp

                memory/3288-28-0x0000000002360000-0x0000000002370000-memory.dmp

                memory/3288-27-0x0000000002360000-0x0000000002370000-memory.dmp

                memory/3288-24-0x0000000002360000-0x0000000002370000-memory.dmp

                memory/3288-35-0x0000000002360000-0x0000000002370000-memory.dmp

                memory/3288-18-0x0000000002C00000-0x0000000002E0F000-memory.dmp

                memory/3288-21-0x0000000002350000-0x0000000002356000-memory.dmp

                memory/3608-10-0x0000000000400000-0x00000000022EB000-memory.dmp