Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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This rule detects the download of a COM scriptlet (.sct file) over HTTP that contains XML and the keyword 'scriptlet'. This behavior is characteristic of the 'Squiblydoo' technique, which abuses legitimate Windows binaries like Regsvr32 to execute arbitrary code, often for defense evasion.
This rule detects HTTP traffic where the User-Agent header contains the string 'CertUtil' (case-insensitive). This pattern is often associated with adversaries using the Windows built-in utility CertUtil to download malicious payloads, a common technique for defense evasion.
This rule detects HTTP POST requests that contain the string "creds" in the URI and have a data size greater than 200 bytes. This pattern is indicative of potential browser credential exfiltration, where an attacker or malicious software attempts to send stolen credentials to a remote server.
This rule detects HTTP requests attempting to access the AWS EC2 Instance Metadata service, specifically targeting the 'latest/meta-data' endpoint. This service, typically found at the IP address 169.254.169.254, provides information about the running EC2 instance, including credentials and other sensitive data. Unauthorized access to this endpoint can indicate an attacker attempting to gain further access or information within an AWS environment.
This Suricata rule detects potential data exfiltration of password store information over HTTP. It specifically looks for HTTP POST requests where the client body contains both the words "password" and "username" (case-insensitive) and the body size is greater than 1000 bytes. This pattern suggests an attempt to send sensitive credential data from a compromised system to a remote server.
Cobalt Strike DNS Beacon Pattern
Suricata
This rule detects a specific pattern associated with Cobalt Strike DNS beacons. It looks for HTTP requests where the URI contains '/updates' and the User-Agent header is 'Mozilla/4.0'. This combination of indicators is often used by Cobalt Strike for command and control communication.
This rule detects large HTTP POST requests containing GZIP compressed data (identified by the magic bytes '|1F 8B|') with a size greater than 100,000 bytes. This behavior is indicative of possible data staging or exfiltration, where an attacker might compress and upload sensitive data from a compromised system.
Confluence Wiki Bulk Export
Suricata
This rule detects HTTP requests to the '/spaces/exportspace.action' URI, which is associated with bulk export functionality in Confluence Wiki. This activity could indicate an attempt to exfiltrate data from a Confluence instance.
This rule detects a high volume of document downloads from SharePoint, specifically looking for repeated access to the `/_layouts/download.aspx` URI. A threshold of 30 downloads within 60 seconds from a single source IP address triggers the alert. This behavior could indicate an attempt to exfiltrate a large amount of data from SharePoint.
XOR Encoded C2 Traffic Pattern
Suricata
This rule detects HTTP client body traffic that appears to be XOR encoded, characterized by a long sequence of non-printable ASCII characters (bytes 0x01-0x1f and 0x7f-0xff) of at least 50 characters. This pattern is often indicative of Command and Control (C2) communication used by malware to evade detection.
Bitsadmin Tool Transfer Download
Suricata
This rule detects the use of the 'bitsadmin' tool in HTTP user agent strings during a file transfer download. Bitsadmin is a legitimate Windows command-line tool used to create, manage, and monitor download and upload jobs, but it is frequently abused by adversaries for command and control, data transfer, and persistence.
This rule detects network reconnaissance activity by identifying HTTP requests where the User-Agent header contains the string "masscan". Masscan is a fast internet port scanner, and its User-Agent string often indicates scanning activity, which aligns with the MITRE ATT&CK technique T1595.002 for active scanning during reconnaissance.
This rule detects HTTP web requests that contain the string "cmd.exe" in the URI, indicating an attempt to execute a command shell via a web request. This is often associated with web application attacks where an attacker tries to leverage a vulnerability to run system commands.
This rule detects HTTP requests where the URI contains the string "-EncodedCommand" case-insensitively. This pattern is commonly associated with PowerShell commands that are base64 encoded, often used by attackers to obfuscate malicious scripts. The rule specifically looks for this string in the HTTP URI, indicating an attempt to download or execute an encoded PowerShell command.
This rule detects HTTP requests that contain patterns indicative of a PowerShell download cradle. Specifically, it looks for 'powershell' and 'IEX' (Invoke-Expression) within the HTTP URI, suggesting an attempt to download and execute a script using PowerShell.
This rule detects attempts to execute the Unix shell '/bin/bash' via HTTP requests. Specifically, it looks for the string '/bin/bash' within the URI of HTTP traffic flowing to the server. This could indicate an attacker attempting command injection or other web-based exploitation to gain shell access.
This rule detects potential data exfiltration to Dropbox cloud storage. It specifically looks for HTTP POST requests to 'api.dropboxapi.com' with a data size greater than 5000 bytes, indicating a significant upload.
This rule detects large HTTP POST requests originating from the internal network ($HOME_NET) to any external destination. It specifically looks for HTTP POST methods and a data size greater than 10,000 bytes. A detection filter is applied to track by source IP, triggering an alert if 20 such large POST requests are observed within a 60-second window. This behavior is indicative of potential data exfiltration over command and control (C2) channels, as large amounts of data are being sent out of the network.
This rule detects HTTP downloads of common script file types (PowerShell, VBScript, JavaScript, HTML Application, Batch, Command) from any source to the internal network. This activity is often associated with initial access or execution techniques where adversaries download malicious scripts to a compromised host.
This rule detects HTTP C2 beaconing activity characterized by regular interval GET requests. It specifically looks for 20 GET requests within a 60-second window from the same source IP address to any destination. This pattern is indicative of command and control communication, often used by malware to check in with its operators.
This rule detects HTTP requests where the URI contains the string "ransom" (case-insensitive). This pattern is indicative of potential ransomware command and control (C2) check-ins, as ransomware often uses terms like 'ransom' in its communication with C2 servers.
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