Ibrahim Saud
@tektrixIndiaCompletionist
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11,679 detections
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Detects potential Adversary-in-the-Middle (AiTM) MFA bypass attacks (quishing). The rule correlates receipt of an email containing an image attachment (potential QR code) but no URL, followed by a risky mobile sign-in event from a device that is unmanaged or lacks trust within a two-hour window.
Detects instances where a user account triggers a risky sign-in event (flagged by identity protection) and subsequently uses the same session or token to authenticate successfully from a different network location or IP address within two hours. This behavior suggests that a malicious actor may be leveraging a compromised session token that should have been revoked, potentially indicating a failure of continuous access evaluation or token revocation mechanisms.
Detects potential Adversary-in-the-Middle (AiTM) activity by identifying successful multi-factor authenticated sign-in events from the same user across different geographic regions and IP addresses within a one-hour timeframe, which is characteristic of session cookie replay attacks.
This rule detects network requests directed at raw.githubusercontent.com that attempt to retrieve 'init.dat' or files named with a specific GUID format, patterns which are characteristic of the Kimsuky threat group using GitHub as a dead drop resolver for C2 infrastructure discovery.
Detects evidence of PowerShell execution occurring within a GitLab CI runner environment that exhibits characteristics of command-and-control (C2) activity. This rule monitors PowerShell Script Block Logging (Event ID 4104) for indicators such as specific CI environment variables (e.g., CI_PIPELINE_SOURCE=api, GIT_STRATEGY=none), static job names associated with known exploitation patterns (e.g., CI_JOB_NAME=run_command), and the dynamic execution of commands using Invoke-Expression (IEX) on environmental variables.
Detects the installation of a Windows service where the ImagePath points to a gitlab-runner executable but the ServiceName deviates from the default 'gitlab-runner' name. This technique is often used to mask persistence or evade simple naming-based detections by utilizing the --service flag to rename the runner service.
Detects rapid deletion of Windows Defender or WdFilter service registry keys by non-standard processes (not System or ntoskrnl.exe). This pattern is consistent with kernel-mode tamper protection bypass attempts, such as the use of the BTR.sys driver to force the removal of defensive configuration entries, effectively disabling Windows Defender.
Detects a suspicious pattern across the environment where a large number of devices apply Group Policy Objects (GPO) shortly after rebooting. This behavior is indicative of potential unauthorized GPO modification used as a persistence or execution mechanism, where malicious logic is staged within a GPO to trigger across the domain upon machine startup.
Detects the execution of PowerShell via a shortcut (.lnk) file that attempts to download and execute remote content using 'Invoke-WebRequest'. The command lines use common obfuscation techniques like 'Hidden' window style and 'Bypass' execution policy, targeting specific known malicious URL patterns or filename keywords.
Detects the execution of cloud CLI tools (aws, az, gcloud) using Unix shells (bash, sh) to perform sensitive operations such as listing secrets, keys, or metadata, which may indicate credential discovery or exfiltration.
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