Analysis

  • max time kernel
    150s
  • max time network
    158s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240226-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
  • submitted
    03/04/2024, 19:01

General

  • Target
    6fb0201dac82a2b6f3c409d74005eb50aab93abd7508f513636be051db86eefd.exe
  • Size 170KB
  • Sample240403-xpdmksac36
  • SHA256 6fb0201dac82a2b6f3c409d74005eb50aab93abd7508f513636be051db86eefd
  • 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 7 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\6fb0201dac82a2b6f3c409d74005eb50aab93abd7508f513636be051db86eefd.exe
    "C:\Users\Admin\AppData\Local\Temp\6fb0201dac82a2b6f3c409d74005eb50aab93abd7508f513636be051db86eefd.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:3736
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\zvedcbky\
      2⤵
        PID:2696
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\uxunegaq.exe" C:\Windows\SysWOW64\zvedcbky\
        2⤵
          PID:2104
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create zvedcbky binPath= "C:\Windows\SysWOW64\zvedcbky\uxunegaq.exe /d\"C:\Users\Admin\AppData\Local\Temp\6fb0201dac82a2b6f3c409d74005eb50aab93abd7508f513636be051db86eefd.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1724
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description zvedcbky "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:496
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start zvedcbky
          2⤵
          • Launches sc.exe
          PID:684
        • 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:2880
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3736 -s 1188
          2⤵
          • Program crash
          PID:3224
      • C:\Windows\SysWOW64\zvedcbky\uxunegaq.exe
        C:\Windows\SysWOW64\zvedcbky\uxunegaq.exe /d"C:\Users\Admin\AppData\Local\Temp\6fb0201dac82a2b6f3c409d74005eb50aab93abd7508f513636be051db86eefd.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1836
        • 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:3636
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1836 -s 512
          2⤵
          • Program crash
          PID:3752
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 468 -p 3736 -ip 3736
        1⤵
          PID:4408
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 476 -p 1836 -ip 1836
          1⤵
            PID:3276
          • 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 --no-appcompat-clear --mojo-platform-channel-handle=1316 --field-trial-handle=2280,i,11703952675008463361,17436195144517971517,262144 --variations-seed-version /prefetch:8
            1⤵
              PID:4072

            Network

                  MITRE ATT&CK Enterprise v15

                  Replay Monitor

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                  Downloads

                  uxunegaq.exe

                  • Path C:\Users\Admin\AppData\Local\Temp\uxunegaq.exe
                  • Size 13.1MB
                  • SHA256 bf1e8e0c68284c6e982116b8896b4680af9ce55a04f2a64965da067b7632557b
                  • MD5 SHA1 SHA512 SSDEEP

                  memory/1836-11-0x00000000006E0000-0x00000000007E0000-memory.dmp

                  memory/1836-12-0x0000000000400000-0x0000000000474000-memory.dmp

                  memory/1836-18-0x0000000000400000-0x0000000000474000-memory.dmp

                  memory/3636-40-0x0000000001DC0000-0x0000000001DD0000-memory.dmp

                  memory/3636-55-0x0000000007600000-0x0000000007A0B000-memory.dmp

                  memory/3636-60-0x0000000000A00000-0x0000000000A15000-memory.dmp

                  memory/3636-31-0x0000000001DC0000-0x0000000001DD0000-memory.dmp

                  memory/3636-13-0x0000000000A00000-0x0000000000A15000-memory.dmp

                  memory/3636-17-0x0000000000A00000-0x0000000000A15000-memory.dmp

                  memory/3636-33-0x0000000001DC0000-0x0000000001DD0000-memory.dmp

                  memory/3636-34-0x0000000001DC0000-0x0000000001DD0000-memory.dmp

                  memory/3636-19-0x0000000000A00000-0x0000000000A15000-memory.dmp

                  memory/3636-21-0x0000000002600000-0x000000000280F000-memory.dmp

                  memory/3636-25-0x0000000000BF0000-0x0000000000BF6000-memory.dmp

                  memory/3636-28-0x0000000001DC0000-0x0000000001DD0000-memory.dmp

                  memory/3636-24-0x0000000002600000-0x000000000280F000-memory.dmp

                  memory/3636-32-0x0000000001DC0000-0x0000000001DD0000-memory.dmp

                  memory/3636-37-0x0000000001DC0000-0x0000000001DD0000-memory.dmp

                  memory/3636-38-0x0000000001DC0000-0x0000000001DD0000-memory.dmp

                  memory/3636-41-0x0000000001DC0000-0x0000000001DD0000-memory.dmp

                  memory/3636-35-0x0000000001DC0000-0x0000000001DD0000-memory.dmp

                  memory/3636-42-0x0000000001DC0000-0x0000000001DD0000-memory.dmp

                  memory/3636-44-0x0000000001DC0000-0x0000000001DD0000-memory.dmp

                  memory/3636-51-0x0000000001DD0000-0x0000000001DD5000-memory.dmp

                  memory/3636-52-0x0000000007600000-0x0000000007A0B000-memory.dmp

                  memory/3636-48-0x0000000001DD0000-0x0000000001DD5000-memory.dmp

                  memory/3636-47-0x0000000001DC0000-0x0000000001DD0000-memory.dmp

                  memory/3636-46-0x0000000001DC0000-0x0000000001DD0000-memory.dmp

                  memory/3636-36-0x0000000001DC0000-0x0000000001DD0000-memory.dmp

                  memory/3636-45-0x0000000001DC0000-0x0000000001DD0000-memory.dmp

                  memory/3636-56-0x0000000001DE0000-0x0000000001DE7000-memory.dmp

                  memory/3636-43-0x0000000001DC0000-0x0000000001DD0000-memory.dmp

                  memory/3636-39-0x0000000001DC0000-0x0000000001DD0000-memory.dmp

                  memory/3736-1-0x00000000004C0000-0x00000000005C0000-memory.dmp

                  memory/3736-8-0x0000000000400000-0x0000000000474000-memory.dmp

                  memory/3736-2-0x0000000002090000-0x00000000020A3000-memory.dmp

                  memory/3736-3-0x0000000000400000-0x0000000000474000-memory.dmp

                  memory/3736-6-0x0000000000400000-0x0000000000474000-memory.dmp

                  memory/3736-9-0x0000000002090000-0x00000000020A3000-memory.dmp