SigmaHQ Detections
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This rule detects attempts to backdoor a domain object by granting DCSync rights to a regular user or machine account. This is achieved by modifying the 'ntSecurityDescriptor' attribute in Active Directory, specifically looking for GUIDs associated with DCSync extended rights. Such a modification allows the designated account to perform DCSync attacks, enabling the retrieval of password hashes for any user or computer in the domain.
Detects unusual processes accessing 'desktop.ini' remotely over a network share with write permissions. This activity can be leveraged to alter how Windows Explorer displays a folder's content (e.g., renaming files) without actually changing the files on disk, which can be used for persistence or privilege escalation.
Detects the creation or modification of a computer account or user account with a suspicious name pattern 'SAMTHEADMIN-X$' (where X is a number) which is known to be generated by a hacktool exploiting CVE-2021-42287 and CVE-2021-42278. This pattern is associated with the 'Sam the Admin' vulnerability exploitation.
This rule detects connection attempts to the SSH service running on an OpenCanary honeypot node. OpenCanary is a honeypot designed to attract and detect unauthorized access attempts. A connection attempt to an SSH service on an OpenCanary instance indicates potential reconnaissance or attack activity against the honeypot, which should be investigated as it suggests an adversary is probing for vulnerable services.
This rule detects the addition of a new conditional access policy within an Azure environment. Conditional Access policies are critical security controls that determine when and how users can access resources. Unauthorized or unexpected changes to these policies could indicate an attacker attempting to establish persistence, bypass existing security controls (like MFA), or gain unauthorized access by modifying access conditions.
Detects the use of 'at' or 'atd' utilities, which are commonly abused by adversaries for persistence or to schedule the execution of malicious code. This rule specifically looks for the execution of '/at' or '/atd' binaries.
This rule detects the execution of the 'esxcli' command on an ESXi host with specific arguments to assign administrative permissions to an account. The command line must contain 'system', 'permission', 'set', and 'Admin', indicating an attempt to modify user permissions to grant administrative privileges. This activity is highly suspicious as it can lead to privilege escalation or persistence on the hypervisor.
Detects the creation of scheduled tasks with specific names ('SC Scheduled Scan' or 'UpdatMachine') that have been associated with the OilRig APT group for persistence, as reported by Nyotron in March 2018.
Detects instances where an SSH service on an OpenCanary honeypot node has had a login attempt. This indicates an adversary attempting to gain unauthorized access to a system, likely through brute-force or credential stuffing attacks against the honeypot.
This rule detects the creation of AWS API keys for a user by a different user. This activity is indicative of a backdoored user account being used to establish persistence within an AWS environment. It can also help identify unusual flows of AWS key creation within an organization.
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