Ankit Mehta
@SecvynIndiaTrusted contributorCompletionist
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8,655 detections
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Detects process command lines containing keywords associated with resource extraction, decryption, or decompression, specifically when initiated by 'GST*.com' or involving 'Optimax.dll'. This behavior is indicative of a Remcos RAT loader attempting to unpack or prepare its payload.
This rule detects potential exploitation attempts related to the Squidbleed vulnerability, specifically looking for command-line arguments indicative of heap buffer overread conditions within the 'squid.exe' process. It monitors for keywords such as 'strchr', 'buffer', 'overread', 'parse', 'directory', and 'listing' in the command line.
Detects suspicious command-line arguments associated with the 'squid.exe' process that may indicate exploitation attempts related to the Squidbleed vulnerability, specifically looking for patterns indicative of 4KB buffer freelist recycling. This includes keywords like 'malloc', 'free', '4096', '4KB', 'buffer', and 'MEM_'.
Detects unusual FTP command sequences where common file listing commands (LIST, NLST, MLSD) are used without specifying a filename parameter, and the RemoteUrl length is unusually short, potentially indicating reconnaissance or an attempt to exploit a vulnerability like Squidbleed. The rule specifically excludes common file extensions to reduce false positives.
Detects the execution of the Squid proxy process with command-line arguments indicating the use of FTP parsing components. This could be indicative of a vulnerability exploitation attempt or unusual configuration.
This rule detects instances where common command and scripting interpreters (powershell.exe, cmd.exe, cscript.exe) are launched by unusual parent processes. The rule specifically looks for these interpreters being spawned by processes other than explorer.exe, notepad.exe, mspaint.exe, or svchost.exe, and triggers if this occurs at least twice within an hour on the same computer by the same user.
This rule detects potential credential harvesting attempts by identifying a high volume of short-duration HTTP requests to common login, sign-in, verify, account, or authentication URI stems. It specifically looks for requests originating from user agents commonly associated with bots or scripting tools (e.g., 'bot', 'curl', 'python', 'powershell') and successful HTTP status codes (200). The 'short' session duration is inferred from small response sizes (less than 5000 bytes), suggesting automated access rather than human interaction.
This rule detects potential User Account Control (UAC) bypass attempts by monitoring the creation of processes for 'fodhelper.exe', 'computerdefaults.exe', or 'slui.exe' when their parent process is not 'explorer.exe' or 'svchost.exe'. These executables are known to be used in UAC bypass techniques to elevate privileges without user interaction.
This rule detects the execution of processes with command-line arguments indicative of AvosLocker ransomware activity. It specifically looks for keywords such as 'avoslocker', 'av0s', 'locker-payload', and 'av0s-ransom' within process command lines, which are known indicators of this ransomware.
This rule detects unusual outbound network connections from devices to well-known public DNS servers (Google DNS, Cloudflare DNS, Quad9, OpenDNS) on ports other than the standard DNS (53), HTTP (80), or HTTPS (443) ports. A high number of such connections (5 or more within an hour) could indicate command and control activity, data exfiltration, or the use of DNS tunneling.
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