Darshan Thummar
@MightyCompletionist
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This rule detects attempts to enumerate AWS EC2 instances via the DescribeInstances API call. It specifically looks for HTTP traffic destined for 'ec2.amazonaws.com' with 'DescribeInstances' in the URI, indicating a potential reconnaissance activity against AWS EC2 infrastructure.
This rule detects attempts to query Windows Firewall status remotely over TCP port 445 (SMB). The detection is based on the presence of the case-insensitive string "FirewallProduct" in the network flow, indicating a potential query for firewall product information. This activity could be part of a reconnaissance phase by an attacker to understand the target's security posture.
This rule detects attempts to query the list of installed AntiVirus (AV) and Endpoint Detection and Response (EDR) products via a web shell. It specifically looks for HTTP requests containing 'wmic' and 'AntiVirus' in the URI, indicating an attempt to use Windows Management Instrumentation Command-line (WMIC) to enumerate security software.
This rule detects attempts to query software inventory using 'wmic product' via a web shell. It specifically looks for HTTP requests where the URI contains the string 'wmic product', indicating a potential command execution to enumerate installed software on a compromised system.
This rule detects network traffic indicative of BloodHound's domain trust collection activity over SMB. Specifically, it looks for TCP traffic on port 445 (SMB) directed to the home network, containing the strings "(objectClass=trustedDomain)" and "SYSVOL" (case-insensitive). This combination suggests an attacker is querying Active Directory for trusted domain objects and potentially enumerating the SYSVOL share, which are common steps in BloodHound's reconnaissance phase to map out trust relationships within a domain.
This rule detects attempts to enumerate objects within a Google Cloud Storage (GCS) bucket. It triggers when HTTP requests are made to 'storage.googleapis.com' with a URI containing '/b/', indicating an attempt to access or list buckets or their contents. The thresholding mechanism (10 events within 30 seconds from the same source IP) aims to identify rapid, potentially automated, enumeration activities.
This rule detects attempts to enumerate Group Policy Object (GPO) settings by identifying LDAP queries containing the string "(objectClass=groupPolicyContainer)" over TCP port 389 (LDAP). This activity is often associated with reconnaissance or discovery phases of an attack, where an adversary is trying to understand the domain's GPO structure.
This rule detects attempts to enumerate Group Policy Objects (GPOs) by accessing the SYSVOL share over SMB. It specifically looks for SMB traffic to port 445 containing both 'SYSVOL' and 'GroupPolicy' keywords, indicating an attempt to browse or access GPO-related files. A threshold of 5 such events within 30 seconds from the same source IP triggers the alert, suggesting a potential network scan or reconnaissance activity.
This rule detects HTTP traffic containing the strings "LogonUserA" and "ImpersonateLoggedOnUser" (case-insensitive) in the file data. This combination of strings suggests an attempt to create a token for impersonation, which is a technique used for privilege escalation, specifically related to the MITRE ATT&CK technique T1134.003 (Token Impersonation/Theft: Impersonation). The rule is designed to identify shellcode or malicious code attempting to leverage these Windows API functions for privilege escalation.
This rule detects HTTP POST requests to graph.microsoft.com with the URI containing 'roleAssignmentScheduleRequests'. This pattern is indicative of an Azure PIM (Privileged Identity Management) Just-in-Time role activation request, which is a mechanism for users to temporarily elevate their privileges within Azure AD. While a legitimate administrative action, it can also be used by attackers for privilege escalation.
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