Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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Detects file creation, modification, or renaming events initiated by ScreenConnect (ClientService.exe or WindowsClient.exe) that are not accompanied by associated user confirmation, consent, or file transfer events. This can indicate an unauthorized or silent file manipulation by a remote actor using the ScreenConnect tool.
Detects the creation or modification of specific system driver files (nvfsflt64.sys, Alinubx.sys) combined with the installation or initiation of a Windows service associated with NVIDIA filter names. This behavior is often indicative of persistence mechanisms, potential rootkit activity, or the deployment of vulnerable drivers (BYOVD).
Detects behavior associated with the TeamFiltration backdoor, where a user account downloads a file from OneDrive, modifies or replaces that file, and re-uploads it within a short timeframe (30 minutes). This pattern is consistent with the 'taint shared content' technique used to distribute malicious files through legitimate cloud storage.
Detects behavior associated with the TeamFiltration backdoor, where a user account downloads a file from OneDrive, modifies or replaces that file, and re-uploads it within a short timeframe (30 minutes). This pattern is consistent with the 'taint shared content' technique used to distribute malicious files through legitimate cloud storage.
Detects behavior associated with the TeamFiltration backdoor, where a user account downloads a file from OneDrive, modifies or replaces that file, and re-uploads it within a short timeframe (30 minutes). This pattern is consistent with the 'taint shared content' technique used to distribute malicious files through legitimate cloud storage.
This rule detects potential ransomware activity by correlating three distinct events: the execution of a suspicious, potentially obfuscated binary (matching a specific naming pattern of _win64.exe) from an untrusted location (e.g., Temp, AppData, Downloads), followed by a high volume of file modifications or renames with specific ransomware-related extensions (.locked), and the dropping of a known ransom note file (RESTORE_FILES.txt) within a short 15-minute time window.
This rule detects potential attempts to tamper with or bypass Windows Defender by monitoring for files or processes named 'ShieldCrash' occurring in close temporal proximity to the creation or modification of files within Windows Defender's shadow or scan directories (BaseNamedObjects\Restricted\WD_SHADOW_ or WD_SCAN). This behavior is often associated with malware attempting to evade security detection.
Detects the creation, modification, or renaming of files named '.passphrase' or '.txid' within user directories. These file names are indicative of potential sensitive credential or wallet-related data storage, which may be targeted by adversaries for credential theft or unauthorized access.
Detects the creation, modification, or renaming of plist files within macOS LaunchAgent directories that match a specific naming pattern (com.[16 letters].plist). This pattern is often used by malware or unauthorized scripts to establish persistence. The rule excludes common, legitimate system processes like Installer and softwareupdated.
Detects a sequence of actions often used to bypass macOS Gatekeeper protections: removing the quarantine extended attribute using 'xattr -c' on a file in the /tmp directory, followed by making that file executable with 'chmod +x', and finally executing the file. This behavior is indicative of malicious software attempting to evade Apple's security checks for downloaded files.
Detects a sequence of actions often used to bypass macOS Gatekeeper protections: removing the quarantine extended attribute using 'xattr -c' on a file in the /tmp directory, followed by making that file executable with 'chmod +x', and finally executing the file. This behavior is indicative of malicious software attempting to evade Apple's security checks for downloaded files.
Detects a sequence of actions often used to bypass macOS Gatekeeper protections: removing the quarantine extended attribute using 'xattr -c' on a file in the /tmp directory, followed by making that file executable with 'chmod +x', and finally executing the file. This behavior is indicative of malicious software attempting to evade Apple's security checks for downloaded files.
Detects the creation of Object Manager symbolic links that redirect the Windows Defender 'WD_SCAN' object to a loopback UNC share path. This behavior is indicative of a symlink exploitation technique (ShieldCrash/CVE-2026-69414) used to manipulate Windows Defender or associated scan operations by redirecting them to an adversary-controlled or loopback-hosted target.
Detects suspicious file create or write operations within the domain SYSVOL Policies directory. This pattern is commonly associated with attackers attempting to deploy malicious payloads, such as ransom notes or configuration changes, via Group Policy Objects (GPO). The rule monitors Windows Event ID 4663 to identify unauthorized modification attempts by non-system accounts.
Detects the creation or modification of scheduled tasks (cron jobs) located within web application log directories (e.g., JBoss, Tomcat, Wildfly) that exhibit behavior consistent with malicious file reinjection. This rule correlates suspicious cron activity with recurring modifications to sensitive web files (e.g., JS bundles, checkout pages), indicating persistent skimmer activity that survives redeployment.
The following analytic detects email files (.pst or .ost) being created outside the standard Outlook directories.
It leverages the Endpoint.Filesystem data model to identify file creation events and filters for email files not located in "C:\Users\*\My Documents\Outlook Files\*" or "C:\Users\*\AppData\Local\Microsoft\Outlook*".
This activity is significant as it may indicate data exfiltration or unauthorized access to email data.
If confirmed malicious, an attacker could potentially access sensitive email content, leading to data breaches or further exploitation within the network.
It leverages the Endpoint.Filesystem data model to identify file creation events and filters for email files not located in "C:\Users\*\My Documents\Outlook Files\*" or "C:\Users\*\AppData\Local\Microsoft\Outlook*".
This activity is significant as it may indicate data exfiltration or unauthorized access to email data.
If confirmed malicious, an attacker could potentially access sensitive email content, leading to data breaches or further exploitation within the network.
KQL Query
This rule detects potentially malicious behavior involving the Python interpreter spawning command-line shells (cmd.exe or powershell.exe), or interactions (creation/modification) with a specific file at 'C:\ProgramData\ur.txt'. This behavior is often associated with post-exploitation activities, staging, or script-based execution of malicious payloads.
Detects the abuse of the legitimate Windows utility 'certutil.exe' to download files from external sources or to decode/deobfuscate files on the host, commonly used as a LOLBIN for malicious activities.
Detects file creation, modification, or renaming activity within AppData directories associated with VPN clients (CyberGhost, NordVPN, ExpressVPN). This rule is intended to identify potential unauthorized access, staging, or tampering with VPN configuration files or credentials often stored in these application directories.
Detects modifications, creation, or renaming of common cryptocurrency wallet files (e.g., wallet.dat, .wallet files) within known storage directories. This behavior is often associated with infostealers or malware attempting to exfiltrate or manipulate user financial assets.
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