Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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This rule detects the execution of VBScript files (.vbs or .vbe) by wscript.exe or cscript.exe where the filename contains keywords commonly associated with phishing lures (e.g., 'Invoice', 'Bill', 'Statement', 'Report', 'Debit', 'Credit', 'Notice', 'Alert', 'Urgent', 'Payment'). The rule triggers if three or more such executions are observed within a one-hour window on a single device, indicating potential malicious activity often associated with phishing campaigns.
Detects exploitation attempts against GeoServer targeting CVE-2024-36401, a vulnerability involving unsafe OGC filter property name evaluation. The rule monitors for malicious HTTP patterns in incoming requests to OGC endpoints (ows, wfs, wms, wcs) and identifies subsequent suspicious process spawning by the GeoServer JVM instance that indicate successful remote code execution.
Detects endpoint browser and email client processes initiating network connections to domains and IP addresses associated with HolaBrief and LoopedIn open-redirect infrastructure, commonly leveraged in invoice-themed phishing campaigns.
This rule identifies potential account compromise by detecting successful logins to at least two different SaaS applications monitored by Microsoft Cloud App Security (MCAS) within a 2-hour window, originating from geolocations separated by more than 500 kilometers. This behavior is indicative of credential sharing or account hijacking where an adversary accesses multiple cloud services rapidly from geographically distant locations.
Detects potential exploitation of ProxyLogon (CVE-2021-26855) on Microsoft Exchange Servers. The rule identifies suspicious process activity where IIS worker processes (w3wp.exe) or Exchange UM processes (UMWorkerProcess.exe) spawn command-line shells (cmd.exe, powershell.exe, etc.) or create web shell files within Exchange-specific web directories (e.g., OWA, autodiscover, ecp).
Detects potential phishing activity involving a two-hop open-redirect chain. The rule monitors for an initial navigation to known SaaS platforms (HolaBrief or LoopedIn), followed within one minute by an outbound request to an external destination where the SaaS domain is present in the HTTP referrer header, indicating a redirect-based phishing mechanism.
Detects internal emails with subject or body content related to payroll information changes (e.g., direct deposit, bank account redirection) sent to HR or payroll-related email addresses or recipients. This behavior is indicative of internal Business Email Compromise (BEC) or an attempt by an attacker (or compromised insider) to facilitate payroll fraud.
Detects high-risk activity where a user session, characterized by specific suspicious browser user agents and non-interactive authentication (indicative of token replay/session hijacking), is followed by changes to Workday payroll information (direct deposit, banking details) or unauthorized access to HR-related email content.
Detects unauthorized attempts to escalate privileges within the MyBB Administrative Control Panel (ACP). The rule identifies malicious activity such as creating an administrator user by assigning usergroup 4, or accessing restricted configuration settings via HTTP POST/GET requests directed at the admin index script.
Detects suspicious activities indicative of a MyBB limited ACP user escalating privileges to full administrator. This includes web server processes (php, httpd, nginx) spawning command shells, interacting with database management tools, creating suspicious session files, or writing executable files to critical directories (cache, templates, uploads, inc).
Detects post-exploitation activities related to the PHP 8.5.7 CVE-2025-15661 StreamBucket SOAP vulnerability. This rule monitors for PHP worker processes spawning shells, writing executable files to suspicious directories, executing system binaries on Windows, or initiating outbound network connections on non-standard ports, including specific proof-of-concept markers.
This rule detects the exploitation of CVE-2026-20245 on Cisco SD-WAN Manager (vManage). It monitors for two distinct phases: 1) The suspicious upload of a tenant-list CSV file via CLI using a malicious filename, and 2) A subsequent privilege escalation attempt where the 'admin' user executes 'su' to switch to a 'troot' user, which is indicative of a backdoor account creation following successful exploitation.
Detects unauthorized persistence mechanisms on Cisco SD-WAN Manager, vSmart, and vBond nodes by monitoring for local account creation (e.g., useradd), modification of sensitive authentication files (/etc/passwd, /etc/shadow), and illicit SSH key placement in authorized_keys. This rule specifically monitors for known exploit paths involving the 'troot' account and related command-line activity indicative of unauthorized administrative access.
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.
Detects the creation of an MSI (Microsoft Installer) file on a device where the file's origin referrer URL indicates it was downloaded from a ZIP archive that was originally an email attachment. This could indicate a user opening a malicious ZIP file from an email, leading to the execution of an installer.
Detects Log4Shell JNDI exploitation attempts by scanning incoming network request data for JNDI patterns and simultaneously monitors for suspicious shell child processes (cmd, powershell, bash, sh) spawned by java.exe, indicating post-exploitation activity.
Detects potential Adversary-in-the-Middle (AiTM) phishing activity by identifying successful user sign-ins from a new, historically unseen IP address occurring within 30 minutes of a legitimate sign-in from a known IP, indicating the potential replay of a stolen session or refresh token.
This rule detects network connections and email URLs that match known typosquatted patterns of Microsoft domains. It aims to identify potential phishing attempts or traffic directed to infrastructure used by the 'Bulletproof Redirect Engine' masquerading as legitimate Microsoft services. The logic filters out legitimate Microsoft-related URLs to minimize false positives.
Detects instances where a guest user or an external account (identified by the #EXT# suffix) performs an operation to add a new member to a Microsoft 365 Group. This behavior can be indicative of a guest account being compromised or misused to escalate privileges or gain unauthorized access by modifying group memberships.
Detects the creation of .ics calendar invitation files in common user download and temporary directories when originated by web browsers or Microsoft Outlook. This pattern is often indicative of spearphishing campaigns where attackers use weaponized calendar files to deliver malicious payloads or links, attempting to exploit users through social engineering.
Detects instances where a user successfully authenticates from geographically distant locations within a short timeframe (impossible travel) followed by sensitive privileged operations within a 4-hour window.
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