Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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Use this query to locate emails and malicious downloads related to the IcedId activity that can lead to ransomware
Use this query to locate commands related to discovering highly privileged users in an environment, sometimes a precursor to ransomware
This query checks for attempts to stop at least 10 separate processes using the taskkill.exe utility. Run query
This query was originally published in the threat analytics report, Ransomware continues to hit healthcare, critical services. There is also a related blog.
In April of 2020, security researchers observed multiple ransomware campaigns using the same set of techniques.
The following query returns alerts raised when backup files were deleted.
The See also section below lists more queries related to techniques shared by these campaigns.
Reference - https://www.microsoft.com/security/blog/2020/04/28/ransomware-groups-continue-to-target-healthcare-critical-services-heres-how-to-reduce-risk/
In April of 2020, security researchers observed multiple ransomware campaigns using the same set of techniques.
The following query returns alerts raised when backup files were deleted.
The See also section below lists more queries related to techniques shared by these campaigns.
Reference - https://www.microsoft.com/security/blog/2020/04/28/ransomware-groups-continue-to-target-healthcare-critical-services-heres-how-to-reduce-risk/
List alerts flagging attempts to delete backup files.
This query checks for alerts related to file drop and remote execution where the file name matches PsExec and similar tools used for distribution
Looks for potential instances of bitlocker modifying registry settings to allow encryption, where it's executed via a .bat file.
This query checks for attempts to delete data on multiple drives using cipher.exe. This activity is typically done by ransomware to prevent recovery of data after encryption.
This query identifies attempts to stop System Restore and prevent the system from creating restore points, which can be used to recover data encrypted by ransomware
This query checks alerts related to file backup deletion and enriches with additional alert evidence information
Use this query to find emails with message IDs that resemble IDs used in known attack emails and contain a link a document in Google Docs. These behaviors have
been observed leading to ransomware attacks.
been observed leading to ransomware attacks.
This query checks for attempts to stop at least 10 separate processes using the net stop command. Run query
Dopplepaymer In-Memory Malware Implant.
This query identifies processes with command line launch strings.
Which match the pattern used in Dopplepaymer ransomware attacks.
This query identifies processes with command line launch strings.
Which match the pattern used in Dopplepaymer ransomware attacks.
Use this query to locate successful delivery of associated malicious downloads that can lead to ransomware
Total Controlled Folder Access events.
This rule detects when Shadow Copies are being deleted. This is a know actions that is performed by TA.
This query detects know commands that have been used by the ransomware actors.
Some information from Mitre Attack:
https://attack.mitre.org/techniques/T1490/
This query detects know commands that have been used by the ransomware actors.
Some information from Mitre Attack:
https://attack.mitre.org/techniques/T1490/
This YARA rule detects the VanHelsing ransomware based on specific byte patterns associated with its file encryption routines, network enumeration capabilities, shadow copy deletion, and ransomware note dropping. The rule includes two main versions of the ransomware's functionality, indicating potential evolution or different variants.
The following analytic detects the use of COM objects like CMLUA or CMSTPLUA to bypass User Account Control (UAC). It leverages Sysmon EventCode 7 to identify the loading of specific DLLs (CMLUA.dll, CMSTPLUA.dll, CMLUAUTIL.dll) by processes not typically associated with these libraries. This activity is significant as it indicates an attempt to gain elevated privileges, a common tactic used by ransomware adversaries. If confirmed malicious, this could allow attackers to execute code with administrative rights, leading to potential system compromise and further malicious activities.
The analytic detects spikes in Server Message Block (SMB) traffic connections, which are used for sharing files and resources between computers. It leverages network traffic logs to monitor connections on ports 139 and 445, and SMB application usage. By calculating the average and standard deviation of SMB connections over the past 70 minutes, it identifies sources exceeding two standard deviations from the average. This activity is significant as it may indicate potential SMB-based attacks, such as ransomware or data theft. If confirmed malicious, attackers could exfiltrate data or spread malware within the network.
The analytic detects the execution of JavaScript using the JScript.Encode CLSID (COM Object) by cscript.exe. This activity is significant as it is a known technique used by ransomware, such as Reddot, to execute malicious scripts and potentially disable AMSI (Antimalware Scan Interface). If confirmed malicious, this behavior could allow attackers to execute arbitrary code, evade detection, and maintain persistence within the environment.
The following analytic detects modifications to the Windows registry aimed at preventing wallpaper changes. It leverages data from the Endpoint.Registry datamodel, specifically monitoring changes to the "NoChangingWallPaper" registry value. This activity is significant as it is a known tactic used by Rhysida ransomware to enforce a malicious wallpaper, thereby limiting user control over system settings. If confirmed malicious, this registry change could indicate a ransomware infection, leading to further system compromise and user disruption.
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