Ankit Mehta
@SecvynIndiaTrusted contributorCompletionist
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8,655 detections
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This rule detects network connections on port 21 (FTP) where the remote URL contains keywords indicative of NetWare directory listings or related services (netware, NDS, bindery, ncf). This could indicate an attempt to discover or interact with NetWare services, potentially exploiting vulnerabilities like Squidbleed.
Detects attempts to exploit the Squidbleed vulnerability by monitoring process command lines for Squid (squid.exe) using specific accept_filter or defer_accept related keywords. This could indicate an attempt to bypass configuration or exploit a vulnerability related to TCP connection handling.
This rule detects suspicious command-line arguments indicative of a potential buffer overflow attempt targeting the 'squid.exe' process. The presence of keywords like 'buffer+', 'ptr++', 'offset', 'increment', or 'boundary' in the command line of 'squid.exe' suggests an attempt to manipulate memory or exploit a vulnerability.
This rule detects potential exploitation of the Squidbleed vulnerability by identifying network connections to FTP port 21 where the remote URL contains 'PASV' or 'EPSV' commands, and the initiating process is 'squid.exe'. This indicates an attempt to abuse FTP passive mode through the Squid proxy.
Detects the generation of core dump files by the Squid proxy server process, which could indicate a crash, segmentation fault, or an attempt to exploit a vulnerability like Squidbleed. This rule specifically looks for 'squid.exe' processes with command line arguments related to core dumps or crashes.
This rule detects suspicious sign-in attempts to Azure AD where Conditional Access policies were not applied, the sign-in was successful, and the user agent string indicates a bot, crawler, headless browser, or common scripting tools like curl, wget, or python. It specifically looks for multiple such logins or logins from multiple unique devices within a 5-minute window for the same user and risk detail.
Detects file creation or renaming events indicative of BlackCat/ALPHV ransomware encryption activity. The rule looks for specific file name patterns and extensions associated with this ransomware, such as '.blackcat', '.b1ack', '.alphv', or '.encrypted', and triggers if 20 or more such files are observed within a 5-minute window on a single device.
This rule detects processes that repeatedly attempt to allocate memory, which can be indicative of malicious activity such as injection, evasion, or resource exhaustion attacks. It specifically looks for Event ID 4688 (process creation) where the command line contains keywords related to memory allocation (allocate, reserve, memory, malloc) and excludes common legitimate processes like SQL Server, Java, and Python. A count of 3 or more such events within an hour for the same computer, filename, and user triggers the alert.
This rule detects the creation of new Windows services (EventID 7045) where the service executable path does not reside in a standard System32 directory (unless it's in a Temp directory) and the executable name contains common scripting interpreters like 'powershell', 'cmd', or 'cscript'. This pattern is often indicative of persistence mechanisms established by adversaries using scripting languages.
This rule detects modifications to critical boot sector files (bootsect, bootmgr, BOOTCODE, MBR) on the C: or X: drives. It specifically looks for these modifications when initiated by processes other than common system processes like 'system', 'csrss.exe', or 'explorer.exe'. The rule counts modifications within one-hour bins and triggers if one or more modifications are observed.
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