Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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Detects attempts to add a user account to the 'admin' group on macOS using the `dseditgroup` utility, which grants administrative privileges to the added user. This action can be used for persistence, privilege escalation, or defense evasion by an attacker.
Detects the addition of a member to a sensitive Active Directory group related to VMware administration (e.g., 'vSphere Admins', 'ESX Admins') using net.exe executed via WinRM (wsmprovhost.exe). This behavior is a key TTP used by threat groups like UNC3944 to escalate privileges and gain control over the vSphere environment after an initial compromise.
KQL Query from file: Fortigate Belsen Leak KQL Check
'Identifies accounts that have been added to a PIM managed privileged group'
'Identifies when a user account was created and then added to the builtin Administrators group in the same day.
This should be monitored closely and all additions reviewed.'
This should be monitored closely and all additions reviewed.'
This query checks for specific processes and domain TLD used in the CVE-2018-4878 flash 0day exploit attack reported by KrCERT.
CVE: CVE-2018-4878.
Read more here:.
Https://www.krcert.or.kr/data/secNoticeView.do?bulletin_writing_sequence=26998.
Https://helpx.adobe.com/security/products/flash-player/apsa18-01.html.
Http://blog.talosintelligence.com/2018/02/group-123-goes-wild.html.
Http://blog.morphisec.com/flash-exploit-cve-2018-4878-spotted-in-the-wild-massive-malspam-campaign.
Tags: #exploit #CVE-2018-4878 #0day #Korea #Flash.
CVE: CVE-2018-4878.
Read more here:.
Https://www.krcert.or.kr/data/secNoticeView.do?bulletin_writing_sequence=26998.
Https://helpx.adobe.com/security/products/flash-player/apsa18-01.html.
Http://blog.talosintelligence.com/2018/02/group-123-goes-wild.html.
Http://blog.morphisec.com/flash-exploit-cve-2018-4878-spotted-in-the-wild-massive-malspam-campaign.
Tags: #exploit #CVE-2018-4878 #0day #Korea #Flash.
Use this query to locate commands related to discovering highly privileged users in an environment, sometimes a precursor to ransomware
This rule detects when a single user adds more than 4 members to the same Office 365 group within a 5-minute window. It specifically looks for successful 'Add member to group' events in Office 365 audit logs, focusing on the `GROUP_MODIFICATION` event type. The threshold of 4 users added is configurable.
This rule detects when a user is successfully removed from a group within Office 365. It specifically looks for 'GROUP_MODIFICATION' events with the product event type 'Remove member from group.' from Microsoft Office 365, where the action was allowed.
Detects when a new group is successfully created within Office 365. This rule specifically looks for events indicating a 'GROUP_CREATION' event type with a product event type of 'Add group.' originating from 'Office 365' by 'Microsoft', where the action was 'ALLOW'. This can help identify legitimate administrative actions or potentially unauthorized group creation.