Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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This rule detects anomalous outbound SMTP (port 25) traffic originating from a NetScaler ADC or Gateway appliance. Since these appliances have no legitimate business requirement to initiate outbound SMTP communication, such traffic is a strong indicator of post-compromise activity, potentially used for command and control or data exfiltration.
Detects DNS queries and TLS SNI traffic associated with known lookalike domains used by the threat actor TA419 for organization impersonation, which are commonly utilized in spearphishing campaigns.
Detects anomalous HTTP GET requests to the Microsoft Teams trap-exp/tokens endpoint that do not carry the expected 'Teams' user-agent string. This pattern is indicative of the DragonForce backdoor attempting to illicitly request Skype authentication tokens.
Detects DNS queries and TLS SNI traffic associated with known lookalike domains used by the threat actor TA419 for organization impersonation, which are commonly utilized in spearphishing campaigns.
Detects outbound TCP traffic on port 443 destined for a hardcoded IP address associated with ValleyRAT C2 activity. The rule specifically monitors for established connections with a small payload size (5 bytes) that lack standard TLS handshake characteristics (no SNI), and applies a threshold to mitigate noise. This behavior is indicative of C2 heartbeats from malicious implants using DLL side-loading techniques.
Detects outbound HTTP GET requests to specific GitHub repository paths hosted on raw.githubusercontent.com, which are associated with the Kimsuky threat actor's 'Operation GitPower'. These paths indicate the retrieval of malicious payloads or scripts from adversary-controlled repositories.
Detects network activity associated with DPRK-affiliated threat actors, specifically connections to known hardcoded C2 IP addresses and DNS queries for malicious o-r.kr subdomains utilized for command and control.
Detects outbound HTTP POST requests that contain a JPEG file signature ('FF D8 FF') in the body but lack a 'Content-Type' header. This pattern is indicative of potential C2 communication from a loader or malware family attempting to exfiltrate or receive data disguised as an image file while bypassing basic header-based inspection.
Detects network traffic associated with Wazza phishkit anti-bot gates, including beacon communications, TLS SNI patterns, fingerprint iframe URIs, and challenge-platform requests.
Detects network traffic (DNS, TLS SNI, and HTTP) associated with Wazza phishkit infrastructure, specifically looking for malicious domains like boegl-krysl.eu and coppietersrecherche.eu, as well as Cloudflare workers.dev domains used for beaconing and lures.
Detects a multi-stage Wazza phishkit communication chain over HTTP, involving initial configuration retrieval, token minting, token firing, and subsequent redirection with signed tokens.
This rule detects outbound TLS traffic to the domain 'trace-flow.ru', which is associated with Max Messenger covert telemetry beaconing behavior. The rule inspects the Server Name Indication (SNI) field in the TLS handshake for the specific domain string.
Detects HTTP GET requests for files with a .hta extension, utilizing a legacy Internet Explorer User-Agent string. This pattern is commonly associated with SideCopy threat group activities where mshta.exe is used to proxy the execution of remotely hosted malicious HTA files, often as part of an initial infection chain.
Detects outbound HTTP requests to known Alibaba OSS buckets hosting malicious AdaptixC2 payloads. This is associated with exploitation attempts against PaperCut MF software (referencing CVE-2026-82078 and CVE-2026-81578).
Detects browser-side malicious activity involving communication with Cloudflare Workers (workers.dev) endpoints typically associated with C2 beaconing (relays, ICE, socket) or the retrieval of trojanized JavaScript dependencies like 'jquery.mousewheel' which often precede second-stage agent execution.
Detects HTTP GET requests for AgtaBackupAgent.msi or AgtaBackupAgent.version, which are indicative of the download phase of the AgtaBackup Remote Access Trojan (RAT).
Detects outbound HTTP GET requests to the known malicious domain 'docsportal.in' attempting to retrieve second-stage payloads such as '161.php' or 'com.hta'. This pattern is associated with the SideCopy threat actor's malware delivery infrastructure.
Detects network communication associated with SideCopy's ReverseRAT malware by monitoring for DNS lookups to a known malicious domain (dns.educationportals.biz) and outbound connections to a hardcoded C2 IP address (45.61.157.22).
Detects DNS queries for the domain 'docsportal.in', which is associated with the SideCopy threat group's HTA-staging activity for delivering the ReverseRAT malware.
Detects HTTP GET requests to Backblaze B2 storage hosting specific archive files identified as payloads for the RustyShade/RustyMove malware family, often used by the APT36 threat group.
Detects network activity associated with a malicious NPM package (typosquatting) beaconing to a known C2 server (69.48.229.140) and performing command and control operations, including command polling and data exfiltration, specifically from a Node.js environment.
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