Google SecOps
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This rule identifies process creations or file creations where the associated file has been tagged as an 'exploit' by VirusTotal. It leverages enrichment from a VirusTotal integration to flag potentially malicious activity related to exploit execution.
This rule detects the use of the 'net use' command to connect to Windows administrative shares (C$, ADMIN$, IPC$). Adversaries often use these shares for lateral movement, file transfer, and remote execution within a network. The rule specifically looks for command-line executions containing 'net use' followed by one of the common administrative share names, case-insensitively.
This rule detects when a known 'benign' binary, as identified by the Google Cloud Threat Intelligence (GCTI) Feed, initiates an outbound network connection to an IP address identified as a Tor exit node, also from the GCTI Feed. The rule also increases the risk score if the Tor exit node is located in specific high-risk countries (Cuba, Iran, North Korea, Russia, Syria). This indicates potential malicious activity where an otherwise legitimate program might be compromised or used for covert communication.
This rule detects the execution of PsExec via the command line on Windows systems. PsExec is a legitimate Microsoft tool that allows administrators to execute processes on remote systems, but it is also frequently abused by adversaries for lateral movement and remote execution within a compromised network.
This rule detects HTTP web access to domains that exhibit low prevalence within the monitored environment. It specifically filters out internal RFC 1918 IP addresses and ensures that only valid Fully Qualified Domain Names (FQDNs) are considered. The prevalence is determined by a rolling maximum count of unique days a domain has been observed, with alerts triggering for domains seen 3 or fewer times. The risk score is incremented based on how low the prevalence is, with the lowest prevalence (1 day) resulting in the highest risk score.
This rule detects attempts to access the Active Directory contact object to read the AD FS Distributed Key Manager (DKM) master key value. This activity is identified by monitoring Windows Security Event ID 4662 (An operation was performed on an object) for specific property GUIDs associated with the DKM master key, combined with a successful user login event (Event ID 4624) from the same host within a 5-minute window. This indicates a potential attempt to compromise AD FS for credential theft or persistence.
Detects the launch of specific utilities (like ntdsutil, vssadmin, diskshadow, esentutl) on key servers. These utilities can be used by adversaries to access or copy the Active Directory domain database (NTDS.dit) or inhibit system recovery, which are common techniques for credential dumping and persistence.
This rule detects the launch of processes whose associated file hash (SHA256) has a low prevalence across the monitored environment. Specifically, it flags processes where the SHA256 hash has been observed on 1 to 3 distinct endpoints over the past 10 days. This can indicate the execution of rare or newly introduced executables, which could be malicious.
This rule detects when a file is downloaded from an IP address and subsequently created on a system, where both the file hash and the IP address are identified by VirusTotal Relationships as being associated with each other, specifically through a 'DOWNLOADED_FROM' relationship. This indicates that the downloaded file is known to have been served from that particular IP address, potentially flagging malicious file distribution.
This rule detects the use of the 'net use' command to connect to Windows administrative shares (C$, ADMIN$, IPC$). It specifically looks for these commands being executed by users who are not part of the 'Information Technology' department or who have the title 'Intern', indicating potentially suspicious activity or a deviation from standard administrative practices. The rule leverages user enrichment data to refine its detection.
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