Sigma Rules
3,132 rules found for "sigma"
System Information Discovery Using sw_vers
Detects the use of "sw_vers" for system information discovery
User Added To Admin Group Via Sysadminctl
Detects attempts to create and add an account to the admin group via "sysadminctl"
Guest Account Enabled Via Sysadminctl
Detects attempts to enable the guest account using the sysadminctl utility
System Information Discovery Via Sysctl - MacOS
Detects the execution of "sysctl" with specific arguments that have been used by threat actors and malware. It provides system hardware information. This process is primarily used to detect and avoid virtualization and analysis environments.
System Network Connections Discovery - MacOs
Detects usage of system utilities to discover system network connections
System Information Discovery Using System_Profiler
Detects the execution of "system_profiler" with specific "Data Types" that have been seen being used by threat actors and malware. It provides system hardware and software configuration information. This process is primarily used for system information discovery. However, "system_profiler" can also be used to determine if virtualization software is being run for defense evasion purposes.
System Shutdown/Reboot - MacOs
Adversaries may shutdown/reboot systems to interrupt access to, or aid in the destruction of, those systems.
Potential Base64 Decoded From Images
Detects the use of tail to extract bytes at an offset from an image and then decode the base64 value to create a new file with the decoded content. The detected execution is a bash one-liner.
Time Machine Backup Deletion Attempt Via Tmutil - MacOS
Detects deletion attempts of MacOS Time Machine backups via the native backup utility "tmutil". An adversary may perform this action before launching a ransonware attack to prevent the victim from restoring their files.
Time Machine Backup Disabled Via Tmutil - MacOS
Detects disabling of Time Machine (Apple's automated backup utility software) via the native macOS backup utility "tmutil". An attacker can use this to prevent backups from occurring.
New File Exclusion Added To Time Machine Via Tmutil - MacOS
Detects the addition of a new file or path exclusion to MacOS Time Machine via the "tmutil" utility. An adversary could exclude a path from Time Machine backups to prevent certain files from being backed up.
Potential WizardUpdate Malware Infection
Detects the execution traces of the WizardUpdate malware. WizardUpdate is a macOS trojan that attempts to infiltrate macOS machines to steal data and it is associated with other types of malicious payloads, increasing the chances of multiple infections on a device.
Gatekeeper Bypass via Xattr
Detects macOS Gatekeeper bypass via xattr utility
Potential XCSSET Malware Infection
Identifies the execution traces of the XCSSET malware. XCSSET is a macOS trojan that primarily spreads via Xcode projects and maliciously modifies applications. Infected users are also vulnerable to having their credentials, accounts, and other vital data stolen.
Cisco Clear Logs
Clear command history in network OS which is used for defense evasion
Cisco Collect Data
Collect pertinent data from the configuration files
Cisco Crypto Commands
Show when private keys are being exported from the device, or when new certificates are installed
Cisco Disabling Logging
Turn off logging locally or remote
Cisco Discovery
Find information about network devices that is not stored in config files
Cisco Denial of Service
Detect a system being shutdown or put into different boot mode
Cisco Dot1x Disabled
Detects the manual disablement of IEEE 802.1X (dot1x) on a Cisco network device interface. Disabling dot1x bypasses Network Access Control (NAC) mechanisms, potentially allowing unauthorized devices to gain access to the internal network. This activity is a common technique used by attackers or malicious insiders to establish persistence or perform lateral movement via rogue devices.
Cisco File Deletion
See what files are being deleted from flash file systems
Cisco Show Commands Input
See what commands are being input into the device by other people, full credentials can be in the history
Cisco Local Accounts
Find local accounts being created or modified as well as remote authentication configurations
Cisco Modify Configuration
Modifications to a config that will serve an adversary's impacts or persistence
Cisco Stage Data
Various protocols maybe used to put data on the device for exfil or infil
Cisco Sniffing
Show when a monitor or a span/rspan is setup or modified
Cisco BGP Authentication Failures
Detects BGP failures which may be indicative of brute force attacks to manipulate routing
Cisco LDP Authentication Failures
Detects LDP failures which may be indicative of brute force attacks to manipulate MPLS labels
DNS Query to External Service Interaction Domains
Detects suspicious DNS queries to external service interaction domains often used for out-of-band interactions after successful RCE
Cobalt Strike DNS Beaconing
Detects suspicious DNS queries known from Cobalt Strike beacons
Monero Crypto Coin Mining Pool Lookup
Detects suspicious DNS queries to Monero mining pools
Suspicious DNS Query with B64 Encoded String
Detects suspicious DNS queries using base64 encoding
Telegram Bot API Request
Detects suspicious DNS queries to api.telegram.org used by Telegram Bots of any kind
DNS TXT Answer with Possible Execution Strings
Detects strings used in command execution in DNS TXT Answer
Wannacry Killswitch Domain
Detects wannacry killswitch domain dns queries
Cleartext Protocol Usage
Ensure that all account usernames and authentication credentials are transmitted across networks using encrypted channels. Ensure that an encryption is used for all sensitive information in transit. Ensure that an encrypted channels is used for all administrative account access.
FortiGate - New Administrator Account Created
Detects the creation of an administrator account on a Fortinet FortiGate Firewall.
FortiGate - Firewall Address Object Added
Detects the addition of firewall address objects on a Fortinet FortiGate Firewall.
FortiGate - New Firewall Policy Added
Detects the addition of a new firewall policy on a Fortinet FortiGate Firewall.
FortiGate - New Local User Created
Detects the creation of a new local user on a Fortinet FortiGate Firewall. The new local user could be used for VPN connections.
FortiGate - New VPN SSL Web Portal Added
Detects the addition of a VPN SSL Web Portal on a Fortinet FortiGate Firewall. This behavior was observed in pair with modification of VPN SSL settings.
FortiGate - User Group Modified
Detects the modification of a user group on a Fortinet FortiGate Firewall. The group could be used to grant VPN access to a network.
FortiGate - VPN SSL Settings Modified
Detects the modification of VPN SSL Settings (for example, the modification of authentication rules). This behavior was observed in pair with the addition of a VPN SSL Web Portal.
Huawei BGP Authentication Failures
Detects BGP failures which may be indicative of brute force attacks to manipulate routing.
Juniper BGP Missing MD5
Detects juniper BGP missing MD5 digest. Which may be indicative of brute force attacks to manipulate routing.
MITRE BZAR Indicators for Execution
Windows DCE-RPC functions which indicate an execution techniques on the remote system. All credit for the Zeek mapping of the suspicious endpoint/operation field goes to MITRE
MITRE BZAR Indicators for Persistence
Windows DCE-RPC functions which indicate a persistence techniques on the remote system. All credit for the Zeek mapping of the suspicious endpoint/operation field goes to MITRE.