Detections

Explore public detection logic contributed by the community across SIEM and rule languages.

2,686 detections

This rule detects various keywords associated with data transfer and staging activities on Cisco devices. These activities could indicate an adversary attempting to move data onto the device for further exfiltration or to move data off the device. The keywords include common protocols and commands like 'tftp', 'rcp', 'puts', 'copy', 'configure replace', and 'archive tar', which are often used for file transfers and configuration management on network devices.
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SigmaHQ Detections@sigmaHQ
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SigmaHQ
2 years ago
0022
Detects when Microsoft Cloud App Security reports suspicious email forwarding rules, such as a user creating an inbox rule to forward copies of all emails to an external address. This activity can indicate an attempt to exfiltrate sensitive information.
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SigmaHQ Detections@sigmaHQ
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SigmaHQ
2 years ago
0021
Detects DNS queries for 'anonfiles.com', which is an anonymous file upload platform frequently used for malicious purposes, including data exfiltration by malware such as BlackByte ransomware. This rule specifically looks for Event ID 3008 from the Microsoft-Windows-DNS Client Operational log, indicating a DNS query for a domain containing '.anonfiles.com'.
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SigmaHQ Detections@sigmaHQ
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SigmaHQ
2 years ago
0020
Adversaries may steal data by exfiltrating it over an un-encrypted network protocol other than that of the existing command and control channel. The data may also be sent to an alternate network location from the main command and control server. This rule detects suspicious outbound SMTP connections by looking for connections to common SMTP ports (25, 587, 465, 2525) from processes that are not common mail client applications like Thunderbird or Outlook, or Microsoft Exchange Server processes.
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SigmaHQ Detections@sigmaHQ
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SigmaHQ
2 years ago
0020
Detects the execution of a Chromium-based browser process with the "--headless" flag and a URL pointing to mockbin.org or run.mocky.io. This activity can indicate an attempt to exfiltrate data or use the browser in an automated, potentially malicious, fashion without a visible user interface.
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SigmaHQ Detections@sigmaHQ
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SigmaHQ
2 years ago
0020
This rule detects HTTP PUT requests where the User-Agent header contains 'WebDAV' and the destination IP address is not a private or loopback address. This activity could indicate an attempt to exfiltrate data to an external WebDAV share.
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SigmaHQ Detections@sigmaHQ
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SigmaHQ
2 years ago
0019
This rule detects the use of DataSvcUtil.exe, a legitimate Microsoft utility, with command-line arguments indicative of data exfiltration. Specifically, it looks for the presence of '/in:', '/out:', and '/uri:' parameters in the command line, combined with the execution of 'DataSvcUtil.exe'. This behavior is often associated with Living Off The Land Binaries (LOLBAS) techniques where adversaries leverage legitimate system tools for malicious purposes, in this case, to exfiltrate data.
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SigmaHQ Detections@sigmaHQ
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SigmaHQ
2 years ago
0019
This rule detects the use of PowerShell cmdlets to exfiltrate email addresses. Specifically, it looks for PowerShell processes executing commands that include 'Add-PSSnapin', 'Get-Recipient', '-ExpandProperty', 'EmailAddresses', 'SmtpAddress', and '-hidetableheaders'. This combination of cmdlets is indicative of an attempt to enumerate and extract email addresses from a system, likely for exfiltration purposes.
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SigmaHQ Detections@sigmaHQ
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SigmaHQ
2 years ago
0019
Detects the usage of the 'sqlite' or 'sqlite3' binaries to query specific database files associated with Firefox and other Gecko-based browsers, such as 'cookies.sqlite' and 'places.sqlite'. This activity is indicative of potential data stealing, particularly targeting browser history, bookmarks, and session cookies.
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SigmaHQ Detections@sigmaHQ
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SigmaHQ
2 years ago
1019
Detects the usage of the PowerShell `Set-Mailbox` cmdlet to configure an SMTP forwarding rule for a mailbox. This can be indicative of an adversary setting up automatic email forwarding to an external address for data exfiltration or continued access to communications.
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SigmaHQ Detections@sigmaHQ
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SigmaHQ
2 years ago
1018
Detects PowerShell script blocks attempting to exfiltrate data using ICMP by creating a System.Net.NetworkInformation.Ping object and sending data. This method allows adversaries to bypass traditional network controls by tunneling data over ICMP.
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SigmaHQ Detections@sigmaHQ
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SigmaHQ
2 years ago
0018
Detects the execution of "csvde.exe" with the '-f' flag, indicating an attempt to export the Active Directory structure. This tool is often used by adversaries for discovery and collection of domain account information.
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SigmaHQ Detections@sigmaHQ
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SigmaHQ
2 years ago
0018
Detects DNS queries for the domain "anonfiles.com", which is an anonymous file upload platform often used by adversaries for malicious purposes, including data exfiltration. This rule specifically looks for any DNS query containing '.anonfiles.com'.
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SigmaHQ Detections@sigmaHQ
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SigmaHQ
2 years ago
0017
Detects an executable initiating a network connection to "ngrok" tunneling domains. Attackers were seen using this "ngrok" in order to store their second stage payloads and malware. While communication with such domains can be legitimate, often times is a sign of either data exfiltration by malicious actors or additional download.
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SigmaHQ Detections@sigmaHQ
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SigmaHQ
2 years ago
0017
Detects the use of the PowerShell `New-MailboxExportRequest` cmdlet to export a mailbox to a remote or local share, which has been observed in ProxyShell exploitation scenarios. This activity indicates an attempt to exfiltrate mailbox data.
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SigmaHQ Detections@sigmaHQ
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SigmaHQ
2 years ago
0017
Detects the execution of "ConfigSecurityPolicy.EXE" with command-line arguments containing URLs (ftp://, http://, https://). This Windows Defender binary can be abused by attackers to download or upload files, potentially leading to arbitrary file download or data exfiltration.
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SigmaHQ Detections@sigmaHQ
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SigmaHQ
2 years ago
0017
Detects the use of the PowerShell `New-MailboxExportRequest` cmdlet to export a mailbox to a remote or local share. This activity has been observed in ProxyShell exploitation scenarios, where attackers exfiltrate mailbox data. The rule specifically looks for the cmdlet name, the `-Mailbox` parameter, and the `-FilePath` parameter followed by a UNC path (indicating a share).
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SigmaHQ Detections@sigmaHQ
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SigmaHQ
2 years ago
0017
Detects the use of the built-in Windows utility 'query.exe' to extract information about active user sessions or running processes. This activity can be indicative of an attacker performing reconnaissance or staging data for exfiltration.
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SigmaHQ Detections@sigmaHQ
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SigmaHQ
2 years ago
0017
Detects suspicious output redirection to the local administrative share (ADMIN$). This technique is often used by malicious scripts or hack tools to stage or exfiltrate data by writing it to a location accessible via the network, specifically targeting the ADMIN$ share on localhost or 127.0.0.1.
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SigmaHQ Detections@sigmaHQ
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SigmaHQ
2 years ago
0016
This rule detects the execution of the Invoke-DNSExfiltrator PowerShell cmdlet, which is used for exfiltrating data over a DNS request covert channel. The detection specifically looks for the presence of the cmdlet name along with common parameters such as '-i', '-d', '-p', '-doh', and '-t', indicating an attempt to use the DNSExfiltrator tool.
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SigmaHQ Detections@sigmaHQ
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SigmaHQ
2 years ago
0015
Detects the execution of WinRAR to compress files with '.dmp', '.dump', or '.hdmp' extensions. This activity could indicate a step in exfiltrating memory dump files or other sensitive dump files.
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SigmaHQ Detections@sigmaHQ
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SigmaHQ
2 years ago
0014
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