Sigma Rules
1,483 rules found
Google Workspace Role Modified or Deleted
Detects when an a role is modified or deleted in Google Workspace.
Google Workspace Role Privilege Deleted
Detects when an a role privilege is deleted in Google Workspace.
Google Workspace User Granted Admin Privileges
Detects when an Google Workspace user is granted admin privileges.
Google Workspace Government Attack Warning
Detects a login attempt in Google Workspace flagged as a potential attack by a government-backed threat actor
Google Workspace Out Of Domain Email Forwarding
Detects automatic email forwarding to external domains in Google Workspace, which may indicate data leakage or misuse.
Suspicious Login Activity Classified By Google
Detects Google Workspace login activity that's classified as suspicious by Google.
New Federated Domain Added
Detects the addition of a new Federated Domain.
Suspicious Email Delivered In Microsoft 365
Detects instances where an email, identified as malicious or suspicious by the Microsoft Defender for Office 365 (formerly ATP) engine, was delivered to a user's Inbox or Junk folder. It might indicate that a potential threat, such as a spearphishing attachment or links, has bypassed initial blocking mechanisms and reached an end-user, requiring further investigation and potential remediation.
New Federated Domain Added - Exchange
Detects the addition of a new Federated Domain.
Activity from Suspicious IP Addresses
Detects when a Microsoft Cloud App Security reported users were active from an IP address identified as risky by Microsoft Threat Intelligence. These IP addresses are involved in malicious activities, such as Botnet C&C, and may indicate compromised account.
Activity Performed by Terminated User
Detects when a Microsoft Cloud App Security reported for users whose account were terminated in Azure AD, but still perform activities in other platforms such as AWS or Salesforce. This is especially relevant for users who use another account to manage resources, since these accounts are often not terminated when a user leaves the company.
Activity from Anonymous IP Addresses
Detects when a Microsoft Cloud App Security reported when users were active from an IP address that has been identified as an anonymous proxy IP address.
Activity from Infrequent Country
Detects when a Microsoft Cloud App Security reported when an activity occurs from a location that wasn't recently or never visited by any user in the organization.
Data Exfiltration to Unsanctioned Apps
Detects when a Microsoft Cloud App Security reported when a user or IP address uses an app that is not sanctioned to perform an activity that resembles an attempt to exfiltrate information from your organization.
Microsoft 365 - Impossible Travel Activity
Detects when a Microsoft Cloud App Security reported a risky sign-in attempt due to a login associated with an impossible travel.
Logon from a Risky IP Address
Detects when a Microsoft Cloud App Security reported when a user signs into your sanctioned apps from a risky IP address.
Microsoft 365 - Potential Ransomware Activity
Detects when a Microsoft Cloud App Security reported when a user uploads files to the cloud that might be infected with ransomware.
PST Export Alert Using eDiscovery Alert
Alert on when a user has performed an eDiscovery search or exported a PST file from the search. This PST file usually has sensitive information including email body content
PST Export Alert Using New-ComplianceSearchAction
Alert when a user has performed an export to a search using 'New-ComplianceSearchAction' with the '-Export' flag. This detection will detect PST export even if the 'eDiscovery search or exported' alert is disabled in the O365.This rule will apply to ExchangePowerShell usage and from the cloud.
Suspicious OAuth App File Download Activities
Detects when a Microsoft Cloud App Security reported when an app downloads multiple files from Microsoft SharePoint or Microsoft OneDrive in a manner that is unusual for the user.
Microsoft 365 - Unusual Volume of File Deletion
Detects when a Microsoft Cloud App Security reported a user has deleted a unusual a large volume of files.
Microsoft 365 - User Restricted from Sending Email
Detects when a Security Compliance Center reported a user who exceeded sending limits of the service policies and because of this has been restricted from sending email.
Cisco Duo Successful MFA Authentication Via Bypass Code
Detects when a successful MFA authentication occurs due to the use of a bypass code. A bypass code is a temporary passcode created by an administrator for a specific user to access a Duo-protected application. These are generally used as "backup codes," so that enrolled users who are having problems with their mobile devices (e.g., mobile service is disrupted, the device is lost or stolen, etc.) or who temporarily can't use their enrolled devices (on a plane without mobile data services) can still access their Duo-protected systems.
Okta Admin Functions Access Through Proxy
Detects access to Okta admin functions through proxy.
Okta Admin Role Assigned to an User or Group
Detects when an the Administrator role is assigned to an user or group.
Okta Admin Role Assignment Created
Detects when a new admin role assignment is created. Which could be a sign of privilege escalation or persistence
Okta API Token Created
Detects when a API token is created
Okta API Token Revoked
Detects when a API Token is revoked.
Okta Application Modified or Deleted
Detects when an application is modified or deleted.
Okta Application Sign-On Policy Modified or Deleted
Detects when an application Sign-on Policy is modified or deleted.
Okta Identity Provider Created
Detects when a new identity provider is created for Okta.
Okta MFA Reset or Deactivated
Detects when an attempt at deactivating or resetting MFA.
Okta Network Zone Deactivated or Deleted
Detects when an Network Zone is Deactivated or Deleted.
Okta Policy Rule Modified or Deleted
Detects when an Policy Rule is Modified or Deleted.
Okta Security Threat Detected
Detects when an security threat is detected in Okta.
Okta Unauthorized Access to App
Detects when unauthorized access to app occurs.
Okta User Account Locked Out
Detects when an user account is locked out.
Bpfdoor TCP Ports Redirect
All TCP traffic on particular port from attacker is routed to different port. ex. '/sbin/iptables -t nat -D PREROUTING -p tcp -s 192.168.1.1 --dport 22 -j REDIRECT --to-ports 42392' The traffic looks like encrypted SSH communications going to TCP port 22, but in reality is being directed to the shell port once it hits the iptables rule for the attacker host only.
File Time Attribute Change - Linux
Detect file time attribute change to hide new or changes to existing files.
Remove Immutable File Attribute - Auditd
Detects removing immutable file attribute.
Data Exfiltration with Wget
Detects attempts to post the file with the usage of wget utility. The adversary can bypass the permission restriction with the misconfigured sudo permission for wget utility which could allow them to read files like /etc/shadow.
Masquerading as Linux Crond Process
Masquerading occurs when the name or location of an executable, legitimate or malicious, is manipulated or abused for the sake of evading defenses and observation. Several different variations of this technique have been observed.
Modify System Firewall
Detects the removal of system firewall rules. Adversaries may only delete or modify a specific system firewall rule to bypass controls limiting network usage or access. Detection rules that match only on the disabling of firewalls will miss this.
Suspicious Commands Linux
Detects relevant commands often related to malware or hacking activity
Suspicious History File Operations - Linux
Detects commandline operations on shell history files
Suspicious C2 Activities
Detects suspicious activities as declared by Florian Roth in its 'Best Practice Auditd Configuration'. This includes the detection of the following commands; wget, curl, base64, nc, netcat, ncat, ssh, socat, wireshark, rawshark, rdesktop, nmap. These commands match a few techniques from the tactics "Command and Control", including not exhaustively the following; Application Layer Protocol (T1071), Non-Application Layer Protocol (T1095), Data Encoding (T1132)
Potential Abuse of Linux Magic System Request Key
Detects the potential abuse of the Linux Magic SysRq (System Request) key by adversaries with root or sufficient privileges to silently manipulate or destabilize a system. By writing to /proc/sysrq-trigger, they can crash the system, kill processes, or disrupt forensic analysis—all while bypassing standard logging. Though intended for recovery and debugging, SysRq can be misused as a stealthy post-exploitation tool. It is controlled via /proc/sys/kernel/sysrq or permanently through /etc/sysctl.conf.
Systemd Service Creation
Detects a creation of systemd services which could be used by adversaries to execute malicious code.