Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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Background Intelligent Transfer Service (BITS) is a way to reliably download files from webservers or SMB servers.
This service is commonly used for legitimate purposes, but can also be used as part of a malware downloader.
Additionally, bitsadmin can be used to upload files and therefore can be used for data exfiltration. This
query will identify use of bitsadmin.exe for either purpose and will identify directionality file transfer
directionality.
This service is commonly used for legitimate purposes, but can also be used as part of a malware downloader.
Additionally, bitsadmin can be used to upload files and therefore can be used for data exfiltration. This
query will identify use of bitsadmin.exe for either purpose and will identify directionality file transfer
directionality.
The following analytic detects a suspicious process making DNS queries to known, abused text-paste web services, VoIP, instant messaging, and digital distribution platforms. It leverages Sysmon EventID 22 logs to identify queries from processes like cmd.exe, powershell.exe, and others. This activity is significant as it may indicate an attempt to download malicious files, a common initial access technique. If confirmed malicious, this could lead to unauthorized code execution, data exfiltration, or further compromise of the target host.
This query checks for network connection failures to Microsoft Defender for Endpoint URLs.
The output includes any device with 1+ connectivity failures, a list of the domains they
failed to connect to (including the number of failures), as well as the overall number of
failures in the time period. Results are sorted by the total number of connection failures
by the device.
The output includes any device with 1+ connectivity failures, a list of the domains they
failed to connect to (including the number of failures), as well as the overall number of
failures in the time period. Results are sorted by the total number of connection failures
by the device.
Pivot from downloads detected by Windows Defender Antivirus to other files downloaded from the same sites.
To learn more about the download URL info that is available and see other sample queries,.
Check out this blog post: https://techcommunity.microsoft.com/t5/Threat-Intelligence/Hunting-tip-of-the-month-Browser-downloads/td-p/220454.
To learn more about the download URL info that is available and see other sample queries,.
Check out this blog post: https://techcommunity.microsoft.com/t5/Threat-Intelligence/Hunting-tip-of-the-month-Browser-downloads/td-p/220454.
Detects executables located in potentially suspicious directories initiating network connections towards file sharing domains.
Download and compress a remote file and store it in a cab file on local machine.
Detects execution of a browser process with a URL argument pointing to a file with a potentially interesting extension. This can be abused to download arbitrary files or to hide from the user for example by launching the browser in a minimized state.
Download or Copy file with Extrac32
Detects the extraction of password protected ZIP archives with suspicious file names. See the filename variable for more details on which file has been opened.
Detects tools and process executions used by Greenbug in their May 2020 campaign as reported by Symantec
MsiExec Web Install
Sigma
Detects suspicious msiexec process starts with web addresses as parameter
Detects the execution of powershell, a WebClient object creation and the invocation of DownloadFile in a single command line
This analytic detects processes making DNS queries to tinyurl.com from suspicious file paths. URL shorteners like tinyurl.com are often used by adversaries to hide malicious destinations for phishing, malware distribution, or command and control (C2). While tinyurl.com is a legitimate service, its use by non-browser processes or scripts, especially from locations like AppData, Temp, or ProgramData, is highly suspicious. Further investigation into the process, its execution context, and the resolved domain is recommended to assess intent and risk.
This detection identifies when a new packaged application has been added, updated, or deleted within Microsoft Intune. This functionality, while legitimate for software deployment, can be abused by adversaries to deploy malicious payloads to Intune-managed devices.
Looks for suspicious keyword additions to windows registry.
Author: Jouni Mikkola
References:
https://threathunt.blog/registry-hunts/
Author: Jouni Mikkola
References:
https://threathunt.blog/registry-hunts/
This query was originally published in the threat analytics report, Sysrv botnet evolution.
Sysrv is a Go-based botnet that targets both Windows and Linux servers, and steals resources to mine cryptocurrency.
The following query finds instances of the Java process being used to execute cmd.exe, and download and execute a PowerShell script.
Sysrv is a Go-based botnet that targets both Windows and Linux servers, and steals resources to mine cryptocurrency.
The following query finds instances of the Java process being used to execute cmd.exe, and download and execute a PowerShell script.
This query was originally published in the threat analytics report, Sysrv botnet evolution.
Sysrv is a Go-based botnet that targets both Windows and Linux servers, and steals resources to mine cryptocurrency.
The following query finds instances where the attacker commanded the Kinsing miner file to be downloaded on Linux devices.
Sysrv is a Go-based botnet that targets both Windows and Linux servers, and steals resources to mine cryptocurrency.
The following query finds instances where the attacker commanded the Kinsing miner file to be downloaded on Linux devices.
'This detection uses Normalized Process Events to hunt Certutil activities'
Detects the usage of one of three Microsoft office applications (Word, Excel, PowerPoint) to download arbitrary files
Detects a script interpreter wscript/cscript opening a network connection to a non-local network. Adversaries may use script to download malicious payloads.
Detects a network connection initiated by programs or processes running from suspicious or uncommon files system locations.
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