Ankit Mehta
@SecvynIndiaTrusted contributorCompletionist
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8,655 detections
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This rule detects an unusually high number of file rename events (20 or more within a 1-hour window) initiated by a single process account. This behavior can be indicative of malicious activities such as data staging prior to exfiltration, ransomware encryption, or attempts to evade detection by renaming malicious files or legitimate system utilities.
This rule detects when the Windows Security Event Log (Event ID 1102) has been cleared on a system. Clearing event logs is a common technique used by adversaries to remove traces of their activity and evade detection.
This rule detects an unusually high volume (10 or more within an hour) of permission changes to files or registry keys by a single user. This activity can be indicative of an adversary attempting to modify access controls to facilitate persistence, privilege escalation, or defense evasion.
This rule detects and summarizes Kerberos authentication ticket requests (EventID 4765) and Kerberos authentication ticket request failures (EventID 4766) by subject username on an hourly basis. A high volume of these events for a single user could indicate credential stuffing, brute-force attempts, or other authentication-related anomalies.
This rule detects when a single user makes multiple changes to security groups within a short timeframe (binned hourly). Specifically, it looks for Event IDs 4752 (A security-enabled global group was changed), 4753 (A security-enabled local group was changed), or 4754 (A security-enabled universal group was changed). This could indicate an attempt to manipulate group memberships for privilege escalation or lateral movement.
This rule detects a high volume (10 or more within an hour) of registry modifications to keys related to 'Run' or 'Services'. Such modifications can indicate attempts to establish persistence, alter system behavior, or install/modify services for malicious purposes. Event ID 4657 specifically logs a registry value being modified.
Detects execution of CRYPTBASE.dll from non‑system directories, a technique used in the STX RAT campaign to hijack legitimate installers (e.g., CPUID HWMonitor, X‑VPN).
This rule detects an unusually high volume of logon events (both successful and failed) or a large number of unique users attempting to log on within a 5-minute window. This behavior is indicative of potential brute-force attacks or credential stuffing attempts against Windows systems.
This rule detects an unusually high number of firewall rule changes (Event ID 4948) occurring on a single computer within a one-hour window. A sudden surge in firewall modifications can indicate malicious activity, such as an attacker attempting to establish persistence, bypass security controls, or facilitate lateral movement by opening new ports or disabling existing rules.
This rule detects an unusual frequency of command-line executions containing the terms 'compliance' or 'audit' on a single computer within a one-hour window. This activity could indicate an adversary performing reconnaissance or discovery to understand system configurations, security policies, or auditing mechanisms.
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