Lacey Cochrane
@NullVectorXUSTrusted contributorCompletionist
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232 detections
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Detects external Microsoft Teams calls involving screen sharing and potential impersonation of trusted entities. The rule filters for calls where the `identity_name` (likely the external caller's domain or display name) matches patterns associated with free/abused TLDs, cheap/throwaway TLDs, phishing-common TLDs, high-risk specialty TLDs, PHaaS kit TLDs, or common impersonated entity names (e.g., 'microsoft', 'helpdesk', 'it.support'). This combination indicates a high risk of credential theft or remote access tool installation via vishing tactics.
SynkLoader PhishLocker Behavior
Cortex XDR
Detects indicators of the PhishLocker credential harvester, specifically the loading of fake Microsoft Visual C++ runtime DLLs from non-standard (user-writable) paths and unauthorized access to Windows lock screen images by Python-based processes.
Detects behavioral indicators associated with the ChocoShell malware, a fileless PowerShell-based infostealer. The rule monitors for malicious command-line activity including AMSI bypass, credential theft from Token Broker and WLAN profiles, disabling of Microsoft Defender signatures, and communication with local API endpoints typical of the CornFlake controller.
Detects the creation of a scheduled task via the Windows COM interface, a technique used by malware like SynkLoader to bypass command-line monitoring (e.g., schtasks.exe). The rule monitors Windows Security Event IDs 4698 and 4702 for tasks configured to trigger on logon that execute script-based content (Python or PowerShell) from user-writable directories.
Detects external Microsoft Teams calls involving screen sharing and potential impersonation of trusted entities. The rule filters for calls where the `identity_name` (likely the external caller's domain or display name) matches patterns associated with free/abused TLDs, cheap/throwaway TLDs, phishing-common TLDs, high-risk specialty TLDs, PHaaS kit TLDs, or common impersonated entity names (e.g., 'microsoft', 'helpdesk', 'it.support'). This combination indicates a high risk of credential theft or remote access tool installation via vishing tactics.
This rule detects messages sent or chats created in Microsoft Teams by external or guest users where the chat name or message content impersonates IT support, helpdesk, or other official organizational entities. It specifically looks for keywords commonly used in phishing attempts to trick users into believing the sender is a legitimate internal service.
Detects anomalous mailbox access via the MailItemsAccessed operation, specifically identifying the unique ClientAppId and API pairing associated with the Storm-2755 (Payroll Pirates) adversary campaign. This activity indicates unauthorized access to email content, typically targeting high-value personnel such as payroll, finance, and HR staff through Adversary-in-the-Middle (AiTM) techniques.
This rule detects Azure AD sign-in attempts to the 'OfficeHome' application resulting in error code 90014. This specific error indicates that the OAuth flow was initiated without the required nonce parameter, a behavior frequently observed when adversary-in-the-middle (AiTM) phishing kits relay authentication flows incorrectly. The rule highlights the significance of this error when correlated with implausible user-agent and operating system combinations.
This rule detects suspicious Microsoft Graph API activity involving the enumeration of user accounts within an organization. It specifically monitors for queries targeting personnel in sensitive roles such as payroll, finance, HR, and administration, as well as bulk enumeration attempts. The detection logic also flags usage of the axios HTTP library, a common tool in such reconnaissance campaigns, and aggregates results by source IP/ASN to identify coordinated efforts, such as those associated with the Storm-2755 threat actor.
Detects OAuth application authorization events where the granted scopes include highly sensitive access such as Gmail, Drive, or Admin APIs. This rule identifies potential consent phishing attacks where users are tricked into granting malicious third-party applications broad, unauthorized access to their Google Workspace account. The rule excludes common, expected applications like Google Cloud SDK or standard Google services.
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