Ankit Mehta
@SecvynIndiaTrusted contributorCompletionist
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8,655 detections
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Detects the execution of Microsoft Edge via the command shell to open a PDF file. This pattern can be indicative of malicious activity where an attacker attempts to bypass direct execution or leverage a browser vulnerability to open a malicious PDF.
This rule detects the presence of known ShadowAgent malware files on devices by matching their SHA256 hashes. It queries 'DeviceFileEvents' to identify any files with SHA256 hashes that are part of a predefined list associated with ShadowAgent.
This rule detects DNS queries for reverse lookups, specifically those ending with '.in-addr.arpa' or '.ip6.arpa'. While legitimate, frequent or unusual reverse DNS queries from a specific device or process could indicate reconnaissance activities or attempts to map internal network infrastructure by an attacker.
This rule detects potential brute force or credential stuffing attacks against Azure AD by identifying multiple failed sign-in attempts followed by a successful sign-in from the same user and IP address within a short time frame (1 minute). It specifically looks for scenarios where the successful sign-in occurs after the failed attempts and involves different applications, excluding common Office 365 services to reduce noise.
This rule detects successful outbound SSH (port 22) connections originating from a private IP address on a device to a public IP address. This could indicate unauthorized remote access, data exfiltration, or command and control activity.
This rule detects interactive logons (LogonType 10) where a single account from the same domain logs into multiple distinct devices. This could indicate an attacker using compromised credentials to move laterally within the network or access multiple systems.
This rule detects multiple stages of activity associated with BaqiyatLock ransomware and Remcos RAT. It identifies the execution of known BaqiyatLock/Remcos files, attempts to bypass User Account Control (UAC) via ms-settings registry hijack, creation of files with the '.bqtlock' extension indicative of BaqiyatLock encryption, and network communication with 'icanhazip.com' for external IP discovery, which is a common reconnaissance step.
This rule detects the execution of 'REAGENTC.EXE' with the '/disable' argument and 'WBADMIN.EXE' with 'delete catalog -quiet' within a 10-minute window on the same device. This combination of commands is indicative of an adversary attempting to inhibit system recovery by disabling Windows Recovery Environment and deleting the Windows Backup Catalog, often seen in ransomware attacks.
This rule detects a high volume of UDP network connections originating from a single process on a device. A count exceeding 50 UDP connections from the same process to the same remote IP address is considered anomalous and could indicate a UDP flood or other denial-of-service attempt.
This rule detects the presence of files or processes with known malicious SHA256 or MD5 hashes. It queries both DeviceProcessEvents and DeviceFileEvents to identify if any file or running process matches the provided list of malicious hashes.
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