Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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Detects and correlates installed PHP software packages and active PHP process execution across endpoints using device inventory, configuration data, and system logs to provide exposure visibility for PHP environments.
Detects PHP error log entries indicating a session object decode failure, which may indicate exploitation attempts of CVE-2026-109618 and CVE-2026-109619. Note - the logsource product php / service error is not defined by SigmaHQ. Map it with a processing pipeline to wherever PHP error lines land in your stack (PHP error_log file, nginx or Apache error log, PHP-FPM log, or syslog/journal).
Detects PHP fatal out-of-memory errors reported in Unknown on line 0, indicating a memory exhaustion bailout before request initialization (pre-RINIT), associated with CVE-2026-109618 and CVE-2026-109619 exploitation attempts. Note - the logsource product php / service error is not defined by SigmaHQ. Map it with a processing pipeline to wherever PHP error lines land in your stack (PHP error_log file, nginx or Apache error log, PHP-FPM log, or syslog/journal). If log_errors is Off, or FPM runs with fastcgi.logging Off and catch_workers_output no, the line is never written.
Detects a PHP-FPM child process crashing with signal 11 (SIGSEGV) as logged by the FPM master, which may indicate exploitation attempts following an arm-shaped request. Correlate with the arm fatal error by timestamp and source. Note - the logsource product linux / service php-fpm is not defined by SigmaHQ. Map it with a processing pipeline to the PHP-FPM master log (for example /var/log/php8.x-fpm.log on Debian/Ubuntu, /var/log/php-fpm/error.log on RHEL-family, container stderr for official php-fpm images, or the php-fpm systemd journal unit).
Detects post-exploitation activity targeting PaperCut servers, including shells spawned by the PaperCut Java process or the creation of malicious files (such as .class files in lib/ or .txt webshells in custom/web/) by the Java application.
Detects PHP out-of-memory fatal errors (Allowed memory size exhausted) on hosts where memory_limit=-1 has been configured as mitigation. On these hosts, memory is unlimited, so this error indicates potential configuration tampering or an attack.
Detects multiple distinct source IPs sending forged 'pitboss PPE' authentication failure messages to NetScaler authentication endpoints within a short timeframe, associated with a fetch-based FreeBSD payload download (kw2-freebsd-x64-s11).
Box Shield Anomalous Download
Cortex XDR
Surfaces Box Shield anomalous download alerts with full context extraction, including download delta, historical baseline vs anomaly period comparison, and source IPs.
Detects CVE-2026-76504 Cisco SD-WAN vManage authentication bypass attempts: POST logins using internal viptela-reserved-* accounts via the percent-encoded /%6a_security_check path. Summarized per host and account.
Detects a sequence where an UpdraftCentral management request is made to a WordPress site followed by plugin installation or user creation requests from the same source within a 30-minute window, potentially indicating unauthorized plugin installation or webshell deployment via compromised management endpoints.
Alerts whenever a default SAP administrative account (e.g., SAP*, DDIC, TMSADM) logs into the system. These accounts should be locked and used only for emergency 'break-glass' scenarios
Detects repeated Ollama warning-level network errors, such as DNS lookup failures, TCP connection issues, or host resolution problems. These events can indicate a connectivity issue and warrant investigation, but do not by themselves establish unauthorized access or reconnaissance.
Detects CVE-2026-76504 Cisco SD-WAN vManage authentication bypass attempts: POST logins using internal viptela-reserved-* accounts via the percent-encoded /%6a_security_check path. Summarized per host and account.
Detects HTTP requests to the WordPress REST batch endpoint (/wp-json/batch/v1 or /?rest_route=/batch/v1) carrying user agents associated with public wp2shell proof-of-concept tooling. This targets the pre-auth route confusion and SQL injection primitive in WordPress Core (CVE-2026-63030, CVE-2026-60137) that leads to full remote code execution.
Detects mail redirection on Zimbra Collaboration. Zimbra is widely deployed in
government, education and smaller enterprises, has been the subject of repeated
mass-exploitation campaigns, and is rarely covered by commercial detection content —
the combination makes it a persistent soft target.
Redirection is the standard persistence on a compromised mailbox: it survives
password resets and quietly copies correspondence onward.
Onboarding: ZIMBRA is ingested via Syslog (Bloo extractor 123).
Integration guide: https://bloo.io/docs/hypercloud/syslog-connector
BQL (Bloo Query Language):
stream=email-gateway where sourcename='ZIMBRA' and action='EMAIL_REDIRECTED'
| groupby sender, recipient, direction, remoteip, subject
government, education and smaller enterprises, has been the subject of repeated
mass-exploitation campaigns, and is rarely covered by commercial detection content —
the combination makes it a persistent soft target.
Redirection is the standard persistence on a compromised mailbox: it survives
password resets and quietly copies correspondence onward.
Onboarding: ZIMBRA is ingested via Syslog (Bloo extractor 123).
Integration guide: https://bloo.io/docs/hypercloud/syslog-connector
BQL (Bloo Query Language):
stream=email-gateway where sourcename='ZIMBRA' and action='EMAIL_REDIRECTED'
| groupby sender, recipient, direction, remoteip, subject
Finds BeyondTrust Remote Support (Bomgar) appliances at version 26.2.3 or earlier that have a public IP address, indicating a potentially internet-facing vulnerable appliance (CVE-2026-102764). Index and field names are placeholders to adapt.
The following analytic detects the disabling of security jobs in CircleCI pipelines. It leverages CircleCI log data, renaming and extracting fields such as job names, workflow IDs, user information, commit messages, URLs, and branches. The detection identifies mandatory jobs for each workflow and checks if they were executed. This activity is significant because disabling security jobs can allow malicious code to bypass security checks, leading to potential data breaches, system downtime, and reputational damage. If confirmed malicious, this could result in unauthorized code execution and compromised pipeline integrity.
Detects when a large number of virtual machines are powered off by a single user or initiator within a short timeframe, which can be an indicator of malicious availability interruption or virtualization disruption (such as ransomware preparation).
Detects repeated Ollama application error events as a possible availability issue. Ollama application logs do not reliably record process termination, so this search cannot confirm a service crash without operating system or service manager telemetry.
Detects incoming emails containing QR code references in the body along with registration/invitation subjects and common document or image attachments, where the QR code URL is either missing (undecoded) or points to domains other than Google Forms, potentially indicating a phishing attempt attempting to bypass standard URL inspection.
Identifies brute force attacks on SAP systems using RFC logons. Detects a single IP attempting to sign in to several systems or clients within a 1-hour interval, indicating potential credential stuffing or internal lateral movement.
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