Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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'This query over Microsoft Entra ID sign-in activity highlights Microsoft Entra ID apps with
an unusually high ratio of distinct geolocations versus total number of authentications'
an unusually high ratio of distinct geolocations versus total number of authentications'
The following analytic detects shared files in Google Drive with suspicious filenames commonly used in spear phishing campaigns. It leverages GSuite Drive logs to identify documents with titles that include keywords like "dhl," "ups," "invoice," and "shipment." This activity is significant because such filenames are often used to lure users into opening malicious documents or clicking harmful links. If confirmed malicious, this activity could lead to unauthorized access, data theft, or further compromise of the user's system.
'This hunting query identifies GitHub activites where a repo was changed from private to public that may be a sign of compromise.'
This query shows information about high confidence phish email that has been released from the Quarantine.
'Detects a successful logon by a privileged account from an ASN not logged in from in the last 14 days.
Monitor these logons to ensure they are legitimate and identify if there are any similar sign ins.'
Monitor these logons to ensure they are legitimate and identify if there are any similar sign ins.'
'Alerts in links that have been shared across multiple Zoom chat channels by the same user in a short space if time.
Adjust the threshold figure to change the number of channels a message needs to be posted in before an alert is raised.'
Adjust the threshold figure to change the number of channels a message needs to be posted in before an alert is raised.'
'Query identifies users denied registration for multiple webinars or recordings but successfully registered for at least one event. Threshold variable adjusts number of events user needs to be rejected from.'
'This hunting query identifies Zoom room systems with high CPU alerts that may be a sign of device compromise.'
'This hunting query identifies GitHub activites where permissions are updated that may be a sign of compromise.'
Snip3 is a family of related remote access trojans. Although the malware in this family contain numerous small variations, they all exhibit similar behaviors and techniques.
The following query looks for keywords observed in emails involved in a Snip3-associated campaign in April and May of 2021. The emails often have an aviation theme, and the campaign primarily targets organizations involved in travel or aviation. Note that keywords may change overtime. These emails were used to send malicious legitimate hosting provider links that redirected to VBS documents hosting loaders. The loaders initiate RevengeRAT or AsyncRAT downloads that eventually establish persistence on targets and exfiltrate data.
The following query looks for keywords observed in emails involved in a Snip3-associated campaign in April and May of 2021. The emails often have an aviation theme, and the campaign primarily targets organizations involved in travel or aviation. Note that keywords may change overtime. These emails were used to send malicious legitimate hosting provider links that redirected to VBS documents hosting loaders. The loaders initiate RevengeRAT or AsyncRAT downloads that eventually establish persistence on targets and exfiltrate data.
This query helps reviewing top 100 malicious senders
This rule identifies 'improbable travel' scenarios where a user successfully logs in from two geographically distant locations within a short time frame, suggesting potential account compromise or abuse, possibly related to Remote Employment Fraud (REF). It calculates the speed of travel required between consecutive login locations and flags events where the speed and distance exceed predefined thresholds. It also checks if the login country differs from the user's known work country.
'This hunting query identifies GitHub activites where there are a large number of deletions that may be a sign of compromise.'
'The alert shows users that join a Zoom meeting from a time zone other than the one the meeting was created in.
You can also whitelist known good time zones in the tz_whitelist value using the tz database name format https://en.wikipedia.org/wiki/List_of_tz_database_time_zones'
You can also whitelist known good time zones in the tz_whitelist value using the tz database name format https://en.wikipedia.org/wiki/List_of_tz_database_time_zones'
This query helps hunting for Tenant allow/block list (TABL) changes in Defender for Office 365
'This hunting query identifies a user that add/invite a member to the organization for the first time. This technique can be leveraged by attackers to add stealth account access to the organization.'
This query looks for file download events identified by Microsoft Defender for Cloud Apps. It will require an corresponding app connector in Microsoft Defender for Cloud Apps.
Reference - https://learn.microsoft.com/defender-cloud-apps/enable-instant-visibility-protection-and-governance-actions-for-your-apps
Reference - https://learn.microsoft.com/defender-cloud-apps/enable-instant-visibility-protection-and-governance-actions-for-your-apps
'This hunting query identifies users joining a meeting from a time zone that a user has not been observed from in the last 30 days.'
'This hunting query identifies GitHub activites its the first time a user deleted a repo that may be a sign of compromise.'
'This alerts when the account setting is changed to allow either external domain access or anonymous access to meetings.'
'This hunting query identifies new domains added to the domain login whitelist in Zoom.'
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