Analysis

  • max time kernel
    142s
  • max time network
    147s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240704-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240704-enlocale:en-usos:windows10-2004-x64system
  • submitted
    08/07/2024, 15:23

General

  • Target
    SecuriteInfo.com.Win32.CrypterX-gen.13041.exe
  • Size 165KB
  • Sample240708-sse8csvgjr
  • SHA256 4f0a6b89e63437c52a7adf09a15950b3ba5b9d1d7c8791a8559721ae24875894
  • 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 7 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\SecuriteInfo.com.Win32.CrypterX-gen.13041.exe
    "C:\Users\Admin\AppData\Local\Temp\SecuriteInfo.com.Win32.CrypterX-gen.13041.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:3480
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\lsxjkcfi\
      2⤵
        PID:1752
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ljtuwsvb.exe" C:\Windows\SysWOW64\lsxjkcfi\
        2⤵
          PID:2540
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create lsxjkcfi binPath= "C:\Windows\SysWOW64\lsxjkcfi\ljtuwsvb.exe /d\"C:\Users\Admin\AppData\Local\Temp\SecuriteInfo.com.Win32.CrypterX-gen.13041.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4668
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description lsxjkcfi "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1320
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start lsxjkcfi
          2⤵
          • Launches sc.exe
          PID:3932
        • 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:3008
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3480 -s 600
          2⤵
          • Program crash
          PID:1168
      • C:\Windows\SysWOW64\lsxjkcfi\ljtuwsvb.exe
        C:\Windows\SysWOW64\lsxjkcfi\ljtuwsvb.exe /d"C:\Users\Admin\AppData\Local\Temp\SecuriteInfo.com.Win32.CrypterX-gen.13041.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1516
        • 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:5048
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1516 -s 516
          2⤵
          • Program crash
          PID:3356
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 3480 -ip 3480
        1⤵
          PID:4920
        • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
          "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --field-trial-handle=1272,i,7761714625659357865,10802238739796857379,262144 --variations-seed-version --mojo-platform-channel-handle=3988 /prefetch:8
          1⤵
            PID:4772
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -pss -s 472 -p 1516 -ip 1516
            1⤵
              PID:2432

            Network

                  MITRE ATT&CK Enterprise v15

                  Replay Monitor

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                  Downloads

                  ljtuwsvb.exe

                  • Path C:\Users\Admin\AppData\Local\Temp\ljtuwsvb.exe
                  • Size 10.5MB
                  • SHA256 505e00d820770ce79f002ba1458c4f2c2a53c07405a26babc49f18679da68319
                  • MD5 SHA1 SHA512 SSDEEP

                  memory/1516-18-0x0000000000400000-0x00000000004C4000-memory.dmp

                  memory/1516-11-0x0000000000400000-0x00000000004C4000-memory.dmp

                  memory/1516-12-0x0000000000400000-0x00000000004C4000-memory.dmp

                  memory/1516-16-0x0000000000400000-0x00000000004C4000-memory.dmp

                  memory/3480-2-0x0000000002210000-0x0000000002223000-memory.dmp

                  memory/3480-4-0x0000000000400000-0x0000000000415000-memory.dmp

                  memory/3480-9-0x0000000000400000-0x0000000000415000-memory.dmp

                  memory/3480-8-0x0000000002210000-0x0000000002223000-memory.dmp

                  memory/3480-7-0x0000000000400000-0x00000000004C4000-memory.dmp

                  memory/3480-1-0x0000000000620000-0x0000000000720000-memory.dmp

                  memory/5048-45-0x00000000019D0000-0x00000000019E0000-memory.dmp

                  memory/5048-38-0x00000000019D0000-0x00000000019E0000-memory.dmp

                  memory/5048-15-0x0000000000600000-0x0000000000615000-memory.dmp

                  memory/5048-31-0x00000000019D0000-0x00000000019E0000-memory.dmp

                  memory/5048-51-0x0000000007200000-0x000000000760B000-memory.dmp

                  memory/5048-55-0x00000000019F0000-0x00000000019F7000-memory.dmp

                  memory/5048-50-0x00000000019E0000-0x00000000019E5000-memory.dmp

                  memory/5048-47-0x00000000019E0000-0x00000000019E5000-memory.dmp

                  memory/5048-46-0x00000000019D0000-0x00000000019E0000-memory.dmp

                  memory/5048-13-0x0000000000600000-0x0000000000615000-memory.dmp

                  memory/5048-43-0x00000000019D0000-0x00000000019E0000-memory.dmp

                  memory/5048-42-0x00000000019D0000-0x00000000019E0000-memory.dmp

                  memory/5048-41-0x00000000019D0000-0x00000000019E0000-memory.dmp

                  memory/5048-40-0x00000000019D0000-0x00000000019E0000-memory.dmp

                  memory/5048-39-0x00000000019D0000-0x00000000019E0000-memory.dmp

                  memory/5048-17-0x0000000000600000-0x0000000000615000-memory.dmp

                  memory/5048-37-0x00000000019D0000-0x00000000019E0000-memory.dmp

                  memory/5048-36-0x00000000019D0000-0x00000000019E0000-memory.dmp

                  memory/5048-35-0x00000000019D0000-0x00000000019E0000-memory.dmp

                  memory/5048-34-0x00000000019D0000-0x00000000019E0000-memory.dmp

                  memory/5048-33-0x00000000019D0000-0x00000000019E0000-memory.dmp

                  memory/5048-32-0x00000000019D0000-0x00000000019E0000-memory.dmp

                  memory/5048-30-0x00000000019D0000-0x00000000019E0000-memory.dmp

                  memory/5048-27-0x00000000019D0000-0x00000000019E0000-memory.dmp

                  memory/5048-24-0x00000000019C0000-0x00000000019C6000-memory.dmp

                  memory/5048-44-0x00000000019D0000-0x00000000019E0000-memory.dmp

                  memory/5048-23-0x0000000002200000-0x000000000240F000-memory.dmp

                  memory/5048-21-0x0000000002200000-0x000000000240F000-memory.dmp

                  memory/5048-54-0x0000000007200000-0x000000000760B000-memory.dmp