Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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Look for non-system accounts SMB accessing a file with write (0x2) access mask via administrative share (i.e C$).
Detects known sensitive file extensions via Zeek
Detects known sensitive file extensions accessed on a network share
Detects file access requests to browser credential stores by uncommon processes. This could indicate a potential attempt at credential stealing. This rule requires heavy baselining before usage to reduce false positives.
Detects raw disk access attempts by uncommon tools or tools located in suspicious directories. This activity could indicate defense evasion, potentially to bypass file system monitoring or access controls.
Detects processes accessing sensitive browser files which may indicate credential theft from web browsers.
The analytic identifies a possible non-common browser process accessing its browser user data profile. This tactic/technique has been observed in various Trojan Stealers, such as SnakeKeylogger, which attempt to gather sensitive browser information and credentials as part of their exfiltration strategy. Detecting this anomaly can serve as a valuable pivot for identifying processes that access lists of browser user data profiles unexpectedly. This detection uses a lookup file `browser_app_list` that maintains a list of well known browser applications and the browser paths that are allowed to access the browser user data profiles.
The following analytic detects non-Chrome processes attempting to access the Chrome extensions file. It leverages Windows Security Event logs, specifically event code 4663, to identify this behavior. This activity is significant because adversaries may exploit this file to extract sensitive information from the Chrome browser, posing a security risk. If confirmed malicious, this could lead to unauthorized access to stored credentials and other sensitive data, potentially compromising the security of the affected system and broader network.
Detects potential DLL side-loading of the CANONSTAGER malware, which is used to deploy the SOGU.SEC backdoor. This rule identifies when the legitimate, signed Canon IJ Printer Assistant Tool (cnmpaui.exe) loads an unsigned DLL with a similar name (cnmpaui.dll) and subsequently reads a .dat file (cnmplog.dat), consistent with the TTPs of the PRC-nexus actor UNC6384.
The following analytic detects suspicious raw access reads to the device disk partition of a host machine. It leverages Sysmon EventCode 9 logs to identify processes attempting to read or write to the boot sector, excluding legitimate system processes. This activity is significant as it is commonly associated with destructive actions by adversaries, such as wiping, encrypting, or overwriting the boot sector, as seen in attacks involving malware like HermeticWiper. If confirmed malicious, this behavior could lead to severe impacts, including system inoperability, data loss, or compromised boot integrity.
The following analytic detects suspicious raw access reads to the drive containing the Master Boot Record (MBR). It leverages Sysmon EventCode 9 to identify processes attempting to read or write to the MBR sector, excluding legitimate system processes. This activity is significant because adversaries often target the MBR to wipe, encrypt, or overwrite it as part of their impact payload. If confirmed malicious, this could lead to system instability, data loss, or a complete system compromise, severely impacting the organization's operations.
Detects .lnk (shortcut) files launched by scripting engines (e.g., PowerShell, CMD, WScript) exhibiting suspicious traits like hidden execution, embedded commands, or admin privilege requests. Common in phishing, LOLBin abuse, and initial access.
This detection identifies access to sensitive system and configuration files on an ESXi host, including authentication data, service configurations, and VMware-specific management settings. Interaction with these files may indicate adversary reconnaissance, credential harvesting, or preparation for privilege escalation, lateral movement, or persistence.
The analytic detects when a Windows RDP client attempts to execute an RDP file from a temporary directory, downloads directory, or Outlook directories. This detection is significant as it can indicate an attempt for an adversary to deliver a .rdp file, which may be leveraged by attackers to control or exfiltrate data. If confirmed malicious, this activity could lead to unauthorized access, data theft, or further lateral movement within the network.
This rule detects attempts by scripting language interpreters (Node.js, Python, PowerShell) to access sensitive browser credential files such as 'Login Data', 'Web Data', and 'Cookies' from Chrome and Brave browser user data directories. It also includes specific file paths that might be associated with known browser extensions or malware that target these files. This activity is indicative of credential dumping or information stealing.
This rule detects suspicious activity where scripting interpreters (node.exe, python.exe, pwsh.exe, powershell.exe) are observed accessing a large number of potentially sensitive files (e.g., .env, secret, wallet, keypair, credential, recovery files, or common document/data file types like .pdf, .docx, .csv, .json, .txt) and subsequently exfiltrating a significant amount of data over the network. It correlates file access events with network outbound traffic from the same process within a 10-minute window, flagging instances where more than 20 distinct sensitive files are accessed and over 500KB of data is sent out.
This rule detects suspicious file access patterns to Chromium-based browser extension data folders. Specifically, it looks for any process other than the browser itself (msedge.exe, chrome.exe, wavebrowser.exe, vivaldi.exe, brave.exe, brchrome.exe) reading or accessing files within the 'AppData\Local\User Data\Default\Extensions' directory. This activity could indicate an attempt by malware or an unauthorised process to inspect, modify, or exfiltrate data related to browser extensions, potentially for credential theft, session hijacking, or to inject malicious code into extensions.
This analytic identifies processes accessing FileZilla XML configuration files (recentservers.xml and sitemanager.xml) by monitoring Windows Security Event Code 4663. This activity is considered unusual if not performed by the legitimate FileZilla application or OneDrive, and can indicate unauthorized access or manipulation of sensitive configuration files. Such access could lead to data exfiltration, credential theft, or further system compromise.
KQL Query
KQL Query from file: Sentinel All-In-One UPN ThreatHunt
KQL Query from file: The Hunt for Top 10 Self Hosted AI
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