Ankit Mehta
@SecvynIndiaTrusted contributorCompletionist
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8,655 detections
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This rule detects potential session token leakage through network proxy responses. It specifically looks for network events where the action type is 'NetworkSignatureInspected', the remote port is 21 (commonly FTP), and the remote URL contains keywords indicative of session tokens such as 'session', 'cookie', 'JSESSIONID', 'PHPSESSID', or 'ASP.NET_SessionId'. This could indicate a vulnerability where session information is inadvertently exposed in proxy logs or network traffic.
Detects potential memory leak debugging or exploitation attempts related to the Squid proxy server by monitoring process command lines for keywords like 'leak', 'memory', 'valgrind', 'gdb', or 'debug'. This could indicate an adversary attempting to exploit a memory leak vulnerability or a developer debugging one.
Detects potential port scanning activity originating from a Squid proxy server targeting FTP (port 21). This rule identifies instances where a Squid process attempts to connect to port 21 on multiple remote IPs within a one-hour window, which could indicate reconnaissance or malicious activity.
This rule detects attempts to extract authorization headers (Bearer, Basic, or X-API-Key) over FTP (port 21) by inspecting network signatures. This could indicate an attempt to exploit a vulnerability or misconfiguration where sensitive credentials are being transmitted in an insecure manner.
Detects the execution of 'squid.exe' with command-line arguments that contain whitespace characters potentially indicative of a NULL terminator vulnerability (Squidbleed). The rule specifically looks for common whitespace representations like 'w_space', 'space', 'tab', 'newline', '\n', '\r', and '\t' in the command line.
This rule detects potential exploitation attempts related to the 'Squidbleed' vulnerability (CVE-2021-28116) by monitoring 'squid.exe' process command lines for keywords indicative of stack variable overflow exploitation in its FTP parser. Specifically, it looks for the presence of terms like 'stack', 'heap', 'offset', 'buffer', or 'pointer' combined with 'overread', 'overflow', or 'bounds'.
This rule detects potential exploitation attempts related to the Squidbleed vulnerability, specifically looking for the execution of 'squid.exe' with command-line arguments indicative of a 'while loop bypass via null terminator manipulation'. The keywords 'while', '++copyFrom', 'strchr', and 'w_space' are used to identify suspicious command-line activity.
This rule detects when the 'squid.exe' process is executed with command-line arguments indicating a configuration reload, restart, or explicit use of 'squid.conf'. This could be indicative of an attacker manipulating Squid proxy settings, potentially as part of the Squidbleed vulnerability exploitation or other malicious activity.
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 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.
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