SigmaHQ Detections
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Detects changes to the ClickOnce trust prompt registry key to enable installations from various locations, such as the Internet. This modification can allow an attacker to bypass security prompts and execute untrusted code via ClickOnce applications.
Detects the creation of suspicious files (jsp, java, class) in SAP NetWeaver directories, which may indicate exploitation attempts of vulnerabilities such as CVE-2025-31324, potentially leading to webshell deployment.
Detects activity when an AWS user's login profile (password) is modified by another user. This can indicate an attacker with the "iam:UpdateLoginProfile" permission is changing passwords on behalf of other users to gain access to the AWS console.
This rule detects when a Conditional Access (CA) policy is deleted in Azure Active Directory (now Microsoft Entra ID). This activity is critical to monitor as the removal of a CA policy can significantly weaken an organization's security posture by bypassing multi-factor authentication, device compliance checks, or other access controls. The rule specifically looks for the 'Delete conditional access policy' message in the Azure Audit Logs. While the rule's title suggests identifying actions by 'non-approved actors', the current detection logic only identifies the deletion event itself, not the actor's approval status. Further enrichment or correlation would be needed to determine if the actor is unauthorized.
This rule detects when a user is removed from a group that has Conditional Access (CA) policy modification access within Azure Active Directory. Such groups are critical for managing access to resources, and unauthorized removal of members could indicate an attempt to evade detection, disrupt security controls, or prepare for further malicious activity. Monitoring these removals helps identify potential privilege escalation, defense evasion, or persistence attempts.
This rule detects a measurable increase of successful authentications, specifically when the count of successful sign-ins increases by 10% or greater. This could indicate an adversary attempting to gain access through brute-force, password spraying, or credential stuffing attacks, or potentially an increase in legitimate user activity that needs to be baselined.
Detects attempts to discover files with setuid/setgid capabilities using the 'getcap' command. This activity is often a precursor to privilege escalation on Linux systems, as adversaries search for binaries that can be abused to gain higher privileges.
This rule detects attempts to add a user to the 'admin' group on macOS systems using the `dscl` command-line utility. Specifically, it looks for `dscl` commands that include the `-append` option, target the `/Groups/admin` path, and modify `GroupMembership`. This activity is often associated with privilege escalation or persistence by granting administrative rights to a standard user account.
Detects successful logon from public IP address via SMB. This can indicate a publicly-exposed SMB port.
Detects a failed logon attempt from a public IP address on a Windows system. This can indicate an attempt to gain unauthorized access, potentially through brute-force attacks or credential stuffing, especially if the system is not intended to be exposed to the internet for direct login.
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