Ankit Mehta
@SecvynIndiaTrusted contributorCompletionist
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8,654 detections
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Detects network communication associated with the Bear C2 framework by identifying specific beacon URI patterns (/beacon?id=<uuid>) and connections to known non-standard listener ports (4321, 8080). The rule also monitors for process command lines containing specific hardcoded identifiers associated with this C2 implant.
This rule monitors for Cisco ASA/FTD device logs indicating an unexpected process crash (e.g., 'crashinfo', 'Traceback', 'decode-CF process restart') in conjunction with logs related to WebVPN activity or malformed HTTP requests. This pattern is indicative of potential exploitation attempts against the Cisco WebVPN service, such as those targeting CVE-2026-20349.
Detects anomalous account behavior where a single user account authenticates to three or more distinct applications within a 60-minute window while originating from at least two different IP addresses. This pattern is indicative of a successful account compromise followed by rapid reconnaissance or data exfiltration across multiple cloud services.
Detects sign-in activity originating from a known suspicious VPN/proxy IP range targeting critical Microsoft 365 applications. The rule specifically monitors for instances where multi-factor authentication (MFA) enforcement appears to be absent or failed, suggesting a potential account compromise and subsequent data access attempt via a proxy/VPN.
This rule detects a suspicious sequence of events where a user performs an unusual device-code authentication (potentially indicative of device code phishing) followed shortly by an OAuth application consent or permission grant event. It flags potential compromise if the sign-in is new for the user or occurs in a short timeframe, with optional indicators associated with the 'maillive.sbs' phishing infrastructure.
Detects a suspicious two-stage browser activity sequence where a user accesses a Maze survey-builder lure (t.maze.co) followed by a navigation to a Cloudflare Workers subdomain hosting a spoofed Microsoft Authentication device-code phishing page. This pattern is indicative of a multi-stage phishing attack aimed at credential or device token theft.
Detects the creation of persistence mechanisms through both Registry Run keys and Scheduled Tasks within a one-hour window, specifically targeting names indicative of masquerading as legitimate update or helper components.
This rule monitors network traffic for communication with known malicious IP addresses (143.198.7.94 and 157.254.167.12) associated with the exploitation of NetScaler CVE-2026-88772 as part of the WHIPSHOT_SLAPSHOT campaign. These IPs are linked to staging, exploitation, and web shell backdoor installation activities.
Detects anomalous, high-frequency outbound connection attempts from a NetScaler appliance to internal network hosts. This pattern is indicative of potential post-exploitation lateral movement or internal network scanning by the SLAPSHOT malware (associated with CVE-2026-88772), as an appliance typically should not engage in rapid internal fan-out behavior.
Detects the execution of known tunneling binaries (ngrok, cloudflared) or network connections to tunneling service domains (ngrok.io, ngrok-free.app, trycloudflare.com), which are frequently used to establish unauthorized remote access or bypass perimeter security controls.
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