Analysis

  • max time kernel
    147s
  • max time network
    155s
  • 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, 13:19

General

  • Target
    SecuriteInfo.com.Trojan-Ransom.StopCrypt.22110.437.exe
  • Size 153KB
  • Sample240708-qkhmea1arr
  • SHA256 793959ab5ee6f59d49e330b808c2300772290f68bce04be397b1d02ea26833e6
  • 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
  • Stops running service(s) 4 TTPs
  • 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\SecuriteInfo.com.Trojan-Ransom.StopCrypt.22110.437.exe
    "C:\Users\Admin\AppData\Local\Temp\SecuriteInfo.com.Trojan-Ransom.StopCrypt.22110.437.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:2276
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ugkqiblr\
      2⤵
        PID:1568
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\xjvaxdcq.exe" C:\Windows\SysWOW64\ugkqiblr\
        2⤵
          PID:1888
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create ugkqiblr binPath= "C:\Windows\SysWOW64\ugkqiblr\xjvaxdcq.exe /d\"C:\Users\Admin\AppData\Local\Temp\SecuriteInfo.com.Trojan-Ransom.StopCrypt.22110.437.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2760
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description ugkqiblr "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2388
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start ugkqiblr
          2⤵
          • Launches sc.exe
          PID:3920
        • 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:4656
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2276 -s 800
          2⤵
          • Program crash
          PID:3560
      • C:\Windows\SysWOW64\ugkqiblr\xjvaxdcq.exe
        C:\Windows\SysWOW64\ugkqiblr\xjvaxdcq.exe /d"C:\Users\Admin\AppData\Local\Temp\SecuriteInfo.com.Trojan-Ransom.StopCrypt.22110.437.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4696
        • 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:4992
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4696 -s 536
          2⤵
          • Program crash
          PID:1556
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 4696 -ip 4696
        1⤵
          PID:3740
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 2276 -ip 2276
          1⤵
            PID:1880
          • 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=4500,i,8915411528919259905,1376069533550353705,262144 --variations-seed-version --mojo-platform-channel-handle=4508 /prefetch:8
            1⤵
              PID:4868

            Network

                  MITRE ATT&CK Enterprise v15

                  Replay Monitor

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                  Downloads

                  xjvaxdcq.exe

                  • Path C:\Users\Admin\AppData\Local\Temp\xjvaxdcq.exe
                  • Size 14.3MB
                  • SHA256 d1f94101de34d439e4912dca45fbdc47346d104e6c32d50579c4c678cbed2c73
                  • MD5 SHA1 SHA512 SSDEEP

                  memory/2276-11-0x0000000000400000-0x0000000002713000-memory.dmp

                  memory/2276-1-0x00000000028D0000-0x00000000029D0000-memory.dmp

                  memory/2276-3-0x0000000000400000-0x0000000000415000-memory.dmp

                  memory/2276-2-0x0000000002880000-0x0000000002893000-memory.dmp

                  memory/2276-13-0x0000000000400000-0x0000000000415000-memory.dmp

                  memory/2276-12-0x0000000002880000-0x0000000002893000-memory.dmp

                  memory/4696-10-0x0000000000400000-0x0000000002713000-memory.dmp

                  memory/4992-42-0x00000000023B0000-0x00000000023C0000-memory.dmp

                  memory/4992-37-0x00000000023B0000-0x00000000023C0000-memory.dmp

                  memory/4992-15-0x0000000001000000-0x0000000001015000-memory.dmp

                  memory/4992-18-0x0000000002C00000-0x0000000002E0F000-memory.dmp

                  memory/4992-24-0x00000000023B0000-0x00000000023C0000-memory.dmp

                  memory/4992-44-0x00000000031D0000-0x00000000031D5000-memory.dmp

                  memory/4992-48-0x0000000007C00000-0x000000000800B000-memory.dmp

                  memory/4992-52-0x00000000031E0000-0x00000000031E7000-memory.dmp

                  memory/4992-51-0x0000000007C00000-0x000000000800B000-memory.dmp

                  memory/4992-43-0x00000000023B0000-0x00000000023C0000-memory.dmp

                  memory/4992-8-0x0000000001000000-0x0000000001015000-memory.dmp

                  memory/4992-41-0x00000000023B0000-0x00000000023C0000-memory.dmp

                  memory/4992-40-0x00000000023B0000-0x00000000023C0000-memory.dmp

                  memory/4992-39-0x00000000023B0000-0x00000000023C0000-memory.dmp

                  memory/4992-38-0x00000000023B0000-0x00000000023C0000-memory.dmp

                  memory/4992-14-0x0000000001000000-0x0000000001015000-memory.dmp

                  memory/4992-36-0x00000000023B0000-0x00000000023C0000-memory.dmp

                  memory/4992-35-0x00000000023B0000-0x00000000023C0000-memory.dmp

                  memory/4992-34-0x00000000023B0000-0x00000000023C0000-memory.dmp

                  memory/4992-33-0x00000000023B0000-0x00000000023C0000-memory.dmp

                  memory/4992-32-0x00000000023B0000-0x00000000023C0000-memory.dmp

                  memory/4992-31-0x00000000023B0000-0x00000000023C0000-memory.dmp

                  memory/4992-47-0x00000000031D0000-0x00000000031D5000-memory.dmp

                  memory/4992-30-0x00000000023B0000-0x00000000023C0000-memory.dmp

                  memory/4992-29-0x00000000023B0000-0x00000000023C0000-memory.dmp

                  memory/4992-28-0x00000000023B0000-0x00000000023C0000-memory.dmp

                  memory/4992-27-0x00000000023B0000-0x00000000023C0000-memory.dmp

                  memory/4992-21-0x00000000023A0000-0x00000000023A6000-memory.dmp

                  memory/4992-20-0x0000000002C00000-0x0000000002E0F000-memory.dmp