SigmaHQ Detections
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6,797 detections
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Detects tampering of RDP Terminal Service/Server sensitive settings.
Such as allowing unauthorized users access to a system via the 'fAllowUnsolicited' or enabling RDP via 'fDenyTSConnections', etc.
Below is a list of registry keys/values that are monitored by this rule:
- Shadow: Used to enable Remote Desktop shadowing, which allows an administrator to view or control a user's session.
- DisableRemoteDesktopAntiAlias: Disables anti-aliasing for remote desktop sessions.
- DisableSecuritySettings: Disables certain security settings for Remote Desktop connections.
- fAllowUnsolicited: Allows unsolicited remote assistance offers.
- fAllowUnsolicitedFullControl: Allows unsolicited remote assistance offers with full control.
- InitialProgram: Specifies a program to run automatically when a user logs on to a remote computer.
- ServiceDll: Used in RDP hijacking techniques to specify a custom DLL to be loaded by the Terminal Services service.
- SecurityLayer: Specifies the security layer used for RDP connections.
Such as allowing unauthorized users access to a system via the 'fAllowUnsolicited' or enabling RDP via 'fDenyTSConnections', etc.
Below is a list of registry keys/values that are monitored by this rule:
- Shadow: Used to enable Remote Desktop shadowing, which allows an administrator to view or control a user's session.
- DisableRemoteDesktopAntiAlias: Disables anti-aliasing for remote desktop sessions.
- DisableSecuritySettings: Disables certain security settings for Remote Desktop connections.
- fAllowUnsolicited: Allows unsolicited remote assistance offers.
- fAllowUnsolicitedFullControl: Allows unsolicited remote assistance offers with full control.
- InitialProgram: Specifies a program to run automatically when a user logs on to a remote computer.
- ServiceDll: Used in RDP hijacking techniques to specify a custom DLL to be loaded by the Terminal Services service.
- SecurityLayer: Specifies the security layer used for RDP connections.
Detects modifications to DNS records in Active Directory where the Distinguished Name (DN) contains a base64-encoded blob
matching the pattern "1UWhRCAAAAA...BAAAA". This pattern corresponds to a marshaled CREDENTIAL_TARGET_INFORMATION structure,
commonly used in Kerberos coercion attacks. Adversaries may exploit this to coerce victim systems into authenticating to
attacker-controlled hosts by spoofing SPNs via DNS. It is one of the strong indicators of a Kerberos coercion attack,.
where adversaries manipulate DNS records to spoof Service Principal Names (SPNs) and redirect authentication requests like CVE-2025-33073.
Please investigate the user account that made the changes, as it is likely a low-privileged account that has been compromised.
matching the pattern "1UWhRCAAAAA...BAAAA". This pattern corresponds to a marshaled CREDENTIAL_TARGET_INFORMATION structure,
commonly used in Kerberos coercion attacks. Adversaries may exploit this to coerce victim systems into authenticating to
attacker-controlled hosts by spoofing SPNs via DNS. It is one of the strong indicators of a Kerberos coercion attack,.
where adversaries manipulate DNS records to spoof Service Principal Names (SPNs) and redirect authentication requests like CVE-2025-33073.
Please investigate the user account that made the changes, as it is likely a low-privileged account that has been compromised.
Detects the use of Advanced IP Scanner. Seems to be a popular tool for ransomware groups.
Detects creation of "UserInitMprLogonScript" registry value which can be used as a persistence method by malicious actors
Detects network connections via finger.exe, which can be abused by threat actors to retrieve remote commands for execution on Windows devices.
In one ClickFix malware campaign, adversaries leveraged the finger protocol to fetch commands from a remote server.
Since the finger utility is not commonly used in modern Windows environments, its presence already raises suspicion.
Investigating such network connections can also help identify potential malicious infrastructure used by threat actors
In one ClickFix malware campaign, adversaries leveraged the finger protocol to fetch commands from a remote server.
Since the finger utility is not commonly used in modern Windows environments, its presence already raises suspicion.
Investigating such network connections can also help identify potential malicious infrastructure used by threat actors
Detects a suspicious child process of Script Event Consumer (scrcons.exe).
Detects modification of autostart extensibility point (ASEP) in registry.
An adversary may use legitimate desktop support and remote access software, such as Team Viewer, Go2Assist, LogMein, AmmyyAdmin, etc, to establish an interactive command and control channel to target systems within networks.
These services are commonly used as legitimate technical support software, and may be allowed by application control within a target environment.
Remote access tools like VNC, Ammyy, and Teamviewer are used frequently when compared with other legitimate software commonly used by adversaries. (Citation: Symantec Living off the Land)
These services are commonly used as legitimate technical support software, and may be allowed by application control within a target environment.
Remote access tools like VNC, Ammyy, and Teamviewer are used frequently when compared with other legitimate software commonly used by adversaries. (Citation: Symantec Living off the Land)
Files with well-known filenames (parts of credential dump software or files produced by them) creation
Detects the use of Tor or Tor-Browser to connect to onion routing networks
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