Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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This rule detects suspicious activity related to high-volume Server Message Block (SMB) share enumeration and the execution of a specific Python script named 'backup_dfs.py'. It combines three detection logics: identifying processes executing 'backup_dfs.py', detecting an unusual number of SMB network connections to common administrative shares (SYSVOL, NETLOGON, DFS), and flagging high-volume SMB-related identity directory events targeting SYSVOL or NETLOGON. This behavior could indicate an adversary performing discovery of network shares, collecting data, or preparing for data exfiltration.
This rule detects DNS queries with suspicious characteristics that may indicate DNS tunneling, data exfiltration, or command and control activity. It identifies queries with unusually long names, long first labels combined with high entropy, or a high number of subdomains combined with a long first label. Exclusions are made for common legitimate DNS suffixes and specific service-related domains.
This rule detects potential cleartext leakage of usernames and passwords over FTP (port 21) by identifying HTTP requests containing common credential-related keywords in the URL, while explicitly excluding HTTPS traffic. This could indicate sensitive information being transmitted insecurely.
This rule detects successful configuration modifications to diagnostic settings or storage services where the destination resource is identified as being outside of the organization's trusted subscriptions or expected storage naming conventions. This activity may indicate an adversary attempting to exfiltrate logs or data to an attacker-controlled storage account.
This rule detects potential exposure of API keys, tokens, or secrets within FTP directory listings. It specifically looks for network events on remote port 21 (FTP) where the 'RemoteUrl' contains keywords like 'api_key', 'apikey', 'token', 'secret', or 'key=' during a network signature inspection.
Detects network events where FTP (port 21) traffic contains specific timestamp-like patterns in the RemoteUrl, which could indicate an attempt to exploit the Squidbleed vulnerability related to timestamp-to-filename parsing anomalies. The rule looks for 'LIST' command combined with '12:34:56', '2026-', or 'timestamp' in the URL.
This rule detects the creation of a 'logs.dat' file, which is often associated with Remcos RAT for data exfiltration, in common user-related directories (AppData, Temp, Users, Documents) with a file size greater than or equal to 100KB. This pattern suggests an attempt to stage or exfiltrate collected data.
Detects browser connections to the Bing Search by Image endpoint, which can be exploited as a Server-Side Request Forgery (SSRF) proxy to bypass Content Security Policies (CSP) and exfiltrate data, as seen in the SearchLeak attack. The rule specifically looks for connections to 'bing.com/images/searchbyimage' that also include the 'imgurl=' or 'imgurl%3d' parameter, indicating an attempt to use Bing's server-side image fetching capability.
Detects outbound network connections to major Large Language Model (LLM) API endpoints (OpenAI, Google, Anthropic) initiated by processes not explicitly identified as standard web browsers or command-line utilities. This pattern may indicate automated data exfiltration ('prompt stealing' or unauthorized access to corporate data) using custom or malicious tools executing from suspicious directories like temp, appdata, or public folders.
This rule detects a suspicious sequence of network connections indicative of information stealer activity, specifically targeting behaviors observed with malware like VVS Stealer. It identifies instances where a non-browser process, originating from common user-writable or temporary directories (AppData, Temp, Downloads, Users\Public), first connects to an external IP discovery service (ipify.org) and then subsequently communicates with Discord services (discord.com or discordapp.com) within a ten-minute window. This pattern suggests that malware is collecting the victim's public IP address before exfiltrating stolen data (e.g., account or browser information) to Discord infrastructure, often used as a command and control or data exfiltration channel by stealers.
This rule detects anomalous DNS query activity that may indicate command and control (C2) or data exfiltration over the DNS protocol. It monitors for three specific indicators: excessive query volume to a single domain family within a short timeframe, the use of abnormally long DNS subdomain labels, and the transmission of TXT record queries from endpoints not acting as designated DNS servers.
This rule detects the creation of large files (1MB or greater) with names suggestive of exfiltration or staging (e.g., containing 'exfil', 'stage', 'batch', 'zip', 'archive') in common temporary or public user directories. This behavior can indicate an adversary preparing data for exfiltration.
Detects the execution of known cloud storage synchronization and transfer tools (rclone, MEGA) often used by adversaries to exfiltrate data from an endpoint to unauthorized cloud storage providers. The rule specifically flags these tools when they are not running from their standard installation directories or are not digitally signed by verified publishers.
Detects thousands of OneDrive or SharePoint file downloads by a single account during a short period, indicating automated collection rather than ordinary user activity.
Detects a single host making Zulip REST API POST requests to multiple distinct topics, specifically looking for patterns associated with system profiling and command/tasking as observed in ZiChatBot. The rule identifies activity where a source IP uses the Zulip API to send messages to at least two different topics, with the raw request content indicating either 'channel/stream' and 'topic/subject' or keywords like 'system info', 'shellcode', 'task', or 'command'.
Detects anomalous process execution patterns where a database process (postgres or postmaster) or a common system utility (nc, python, bash) is observed initiating unauthorized network connections to a known external C2 IP or accessing sensitive cryptographic files (e.g., server.key). This behavior is indicative of potential post-exploitation activity, specifically the exfiltration of credentials or sensitive data via database-level command execution (sys_eval) or direct file manipulation.
Detects the use of PowerShell to archive files (using Compress-Archive) followed by an HTTP network connection to a suspicious external IP address (91.196.32.232) within a short time window. This sequence is often indicative of data staging followed by exfiltration.
Detects evidence of potential data exfiltration activities including the execution of known exfiltration scripts, the use of netcat for unauthorized data transfer to a specific C2 IP, and the presence or access of BloodHound dump files. The rule also monitors for network communication with a known command and control IP address.
Detects suspicious processes (e.g., node.exe, chost.exe, python) accessing sensitive credential files and subsequently exfiltrating data to the Telegram Bot API via HTTPS POST requests within a 10-minute window. This behavior is indicative of infostealer malware, such as those observed in the Friday Harvest campaign, harvesting and exfiltrating system data.
Detects rapid enumeration of SharePoint sites, drives, lists, and document libraries from one account, which can precede targeted data collection. This rule identifies a high volume of GET requests to SharePoint-related URIs within a short timeframe, indicating potential reconnaissance or data exfiltration attempts.
Detects Python scripts or processes accessing common browser credential and cookie storage files (such as Login Data, key4.db, or cookies.sqlite) and subsequently making outbound network connections, indicating potential theft and exfiltration of browser data.
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