Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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Detects the load of RstrtMgr DLL (Restart Manager) by a suspicious process.
This library has been used during ransomware campaigns to kill processes that would prevent file encryption by locking them (e.g. Conti ransomware, Cactus ransomware). It has also recently been seen used by the BiBi wiper for Windows.
It could also be used for anti-analysis purposes by shut downing specific processes.
This library has been used during ransomware campaigns to kill processes that would prevent file encryption by locking them (e.g. Conti ransomware, Cactus ransomware). It has also recently been seen used by the BiBi wiper for Windows.
It could also be used for anti-analysis purposes by shut downing specific processes.
Detects the image load of VSS DLL by uncommon executables
Detects execution of "taskkill.exe" in order to stop a service or a process. Look for suspicious parents executing this command in order to hunt for potential malicious activity.
Attackers might leverage this in order to conduct data destruction or data encrypted for impact on the data stores of services like Exchange and SQL Server.
Attackers might leverage this in order to conduct data destruction or data encrypted for impact on the data stores of services like Exchange and SQL Server.
Detects loading of Amsi.dll by uncommon processes
Backup Files Deleted
Sigma
Detects deletion of files with extensions often used for backup files. Adversaries may delete or remove built-in operating system data and turn off services designed to aid in the recovery of a corrupted system to prevent recovery.
Ransomware create txt file in the user Desktop
First query digs in print spooler drivers folder for any file creations,
MANY OF THE FILES THAT SHOULD COME UP HERE MAY BE LEGIT. Unsigned files
or ones that don't have any relations to printers that you are using are
suspicious.
Second query that can be used for finding client machines that
could be operating print servers or file servers is also included here.
As additional mitigation for the exploit you might want to block the
incoming traffic to the SMB or EPMAP Ports (445) if you need to keep the
spooler service running to print from clients.
MANY OF THE FILES THAT SHOULD COME UP HERE MAY BE LEGIT. Unsigned files
or ones that don't have any relations to printers that you are using are
suspicious.
Second query that can be used for finding client machines that
could be operating print servers or file servers is also included here.
As additional mitigation for the exploit you might want to block the
incoming traffic to the SMB or EPMAP Ports (445) if you need to keep the
spooler service running to print from clients.
'Example query for SigninLogs showing how to break out packed fields. In this case extending conditional access Policies '
'This query looks for file hashes and AV signatures associated with Prestige ransomware payload.'
'Dev-0530 actors are known to encrypt the contents of the victims device as well as renaming the file extensions. This query looks for the creation of files with .h0lyenc extension or presence of ransom note.'
This query was originally published in the threat analytics report, Ransomware continues to hit healthcare, critical services. There is also a related blog.
Robbinhood is ransomware that has been involved in several high-profile incidents, including a 2019 attack on the city of Baltimore, Maryland. Robbinhood operators often employ a distinctive defense evasion technique, where they load a vulnerable driver on to a target and exploit it, in order to turn off security software -- essentially using the driver as malware.
The following query detects a late stage of this technique, when the operator is issuing commands to turn off the driver.
For a query that detects an earlier stage of this technique, see Detect loading of vulnerable drivers by Robbinhood ransomware campaign.
References:
https://www.microsoft.com/security/blog/2020/04/28/ransomware-groups-continue-to-target-healthcare-critical-services-heres-how-to-reduce-risk/
https://www.microsoft.com/wdsi/threats/malware-encyclopedia-description?Name=Ransom:Win32/Robinhood.A&ThreatID=2147735370
https://www.nytimes.com/2019/05/22/us/baltimore-ransomware.html
Robbinhood is ransomware that has been involved in several high-profile incidents, including a 2019 attack on the city of Baltimore, Maryland. Robbinhood operators often employ a distinctive defense evasion technique, where they load a vulnerable driver on to a target and exploit it, in order to turn off security software -- essentially using the driver as malware.
The following query detects a late stage of this technique, when the operator is issuing commands to turn off the driver.
For a query that detects an earlier stage of this technique, see Detect loading of vulnerable drivers by Robbinhood ransomware campaign.
References:
https://www.microsoft.com/security/blog/2020/04/28/ransomware-groups-continue-to-target-healthcare-critical-services-heres-how-to-reduce-risk/
https://www.microsoft.com/wdsi/threats/malware-encyclopedia-description?Name=Ransom:Win32/Robinhood.A&ThreatID=2147735370
https://www.nytimes.com/2019/05/22/us/baltimore-ransomware.html
Get all filtering events done by the Windows filtering platform.
This includes any blocks done by Windows Firewall rules, but also blocks triggered by some 3rd party firewalls.
When no Firewall rules are configured, the default behavior is to block all incoming network connections.
This includes any blocks done by Windows Firewall rules, but also blocks triggered by some 3rd party firewalls.
When no Firewall rules are configured, the default behavior is to block all incoming network connections.
Establishes a baseline SystemGuardSecurityLevel and show the devices that are below that baseline.
See https://techcommunity.microsoft.com/t5/Microsoft-Defender-ATP/How-insights-from-system-attestation-and-advanced-hunting-can/ba-p/969252 for full details on this query.
And Device Boot Attestation Info and feel free to ping @DepletionMode or @flyingbluemonki on twitter.
See https://techcommunity.microsoft.com/t5/Microsoft-Defender-ATP/How-insights-from-system-attestation-and-advanced-hunting-can/ba-p/969252 for full details on this query.
And Device Boot Attestation Info and feel free to ping @DepletionMode or @flyingbluemonki on twitter.
'This query will alert on any sign-ins from devices infected with malware in correlation with workspace deletion activity.
Attackers may attempt to delete workspaces containing compute instances after successful compromise to cause service unavailability to regular business operation.'
Attackers may attempt to delete workspaces containing compute instances after successful compromise to cause service unavailability to regular business operation.'
LemonDuck is an actively updated and robust malware primarily known for its botnet and cryptocurrency mining objectives. First discovered in 2019, LemonDuck has since adopted more sophisticated behavior and escalated its operations in 2021. Today, beyond using resources for its traditional bot and mining activities, LemonDuck steals credentials, removes security controls, spreads via emails, moves laterally, and ultimately drops more tools for human-operated activity.
Use this query to look for alerts related to suspected ransomware and Cobalt Strike activity, a tool used in numerous ransomware campaigns
This query was originally published in the threat analytics report, Cypherpunk ransomware leaves wake of tampered AVs.
Cypherpunk is a human-operated ransomware campaign named after the unusual .cypherpunk extension given to encrypted files. The attackers often used PSEXESVC, a service that helps the PsExe.exe utility run commands on a remote device. Both PSEXESVC and PsExe.exe are legitimate parts of Windows; however, they can be repurposed by attackers to perform malicious actions.
The query below can find instances of PSEXESVC being used to launch batch files, as often occurred in Cypherpunk attacks.
Cypherpunk is a human-operated ransomware campaign named after the unusual .cypherpunk extension given to encrypted files. The attackers often used PSEXESVC, a service that helps the PsExe.exe utility run commands on a remote device. Both PSEXESVC and PsExe.exe are legitimate parts of Windows; however, they can be repurposed by attackers to perform malicious actions.
The query below can find instances of PSEXESVC being used to launch batch files, as often occurred in Cypherpunk attacks.
DarkSide
KQL
Use this query to look for running DarkSide ransomware behavior in the environment
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 detects attempts to stop System Restore, which would prevent the user from recovering data by going back to a restore point.
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 detects attempts to stop System Restore, which would prevent the user from recovering data by going back to a restore point.
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/
This query was originally published in the threat analytics report, EvilQuest signals the rise of Mac ransomware.
As of the time of this writing (October 2020), ransomware designed to target macOS is relatively rare. EvilQuest is one of the few examples of this kind of malware on the platform.
The query below can detect the creation of a ransom note according to the typical methods of EvilQuest operators. The command the query searches for is associated with, but not definitely indicative of, EvilQuest infections.
Other queries related to EvilQuest ransomware can be found under the See also section below.
As of the time of this writing (October 2020), ransomware designed to target macOS is relatively rare. EvilQuest is one of the few examples of this kind of malware on the platform.
The query below can detect the creation of a ransom note according to the typical methods of EvilQuest operators. The command the query searches for is associated with, but not definitely indicative of, EvilQuest infections.
Other queries related to EvilQuest ransomware can be found under the See also section below.
'This hunting query identifies GitHub activites where there are a large number of deletions that may be a sign of compromise.'
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