Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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Instead of running several queries separately, you can also use a comprehensive query that checks for multiple signs of ransomware activity to identify affected devices. The following consolidated query:
Looks for both relatively concrete and subtle signs of ransomware activity
Weighs the presence of these signs
Identifies devices with a higher chance of being targets of ransomware
When run, this consolidated query returns a list of devices that have exhibited multiple signs of attack. The count of each type of ransomware activity is also shown.
Looks for both relatively concrete and subtle signs of ransomware activity
Weighs the presence of these signs
Identifies devices with a higher chance of being targets of ransomware
When run, this consolidated query returns a list of devices that have exhibited multiple signs of attack. The count of each type of ransomware activity is also shown.
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 use fsutil.exe to clear system logs and delete forensic artifacts.
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 use fsutil.exe to clear system logs and delete forensic artifacts.
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/
Checks for event id 1102 which indicates the security event log was cleared.
This query was originally published in the threat analytics report, Ransomware continues to hit healthcare, critical services.
It finds all user accounts that have logged on to an endpoint affected by Cobalt Strike, a penetration tool.
Assume that all credentials on endpoints affected by Cobalt Strike were available to attackers and that all associated accounts are compromised. Note that attackers will not only dump credentials for accounts that have logged on to interactive or RDP sessions, but will also dump cached credentials and passwords for service accounts and scheduled tasks that are stored in the LSA Secrets section of the registry.
Reference - https://attack.mitre.org/software/S0154/
It finds all user accounts that have logged on to an endpoint affected by Cobalt Strike, a penetration tool.
Assume that all credentials on endpoints affected by Cobalt Strike were available to attackers and that all associated accounts are compromised. Note that attackers will not only dump credentials for accounts that have logged on to interactive or RDP sessions, but will also dump cached credentials and passwords for service accounts and scheduled tasks that are stored in the LSA Secrets section of the registry.
Reference - https://attack.mitre.org/software/S0154/
Detects the execution of "logman" utility in order to disable or delete Windows trace sessions
Identify accounts that have logged on to affected endpoints.
Check for specific alerts.
Check for specific alerts.
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 attackers would compromise a web-facing endpoint and employ tools such as Cobalt Strike to steal users' credentials.
Cobalt Strike is commercial software used to conduct simulated threat campaigns against a target; however, malicious actors also use Cobalt Strike in real attacks. The software has a large range of capabilities, including credential theft.
The following query identifies accounts that have logged on to compromised endpoints and have potentially had their credentials stolen.
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.cobaltstrike.com/
https://attack.mitre.org/software/S0154/
In April of 2020, security researchers observed multiple ransomware campaigns using the same set of techniques. The attackers would compromise a web-facing endpoint and employ tools such as Cobalt Strike to steal users' credentials.
Cobalt Strike is commercial software used to conduct simulated threat campaigns against a target; however, malicious actors also use Cobalt Strike in real attacks. The software has a large range of capabilities, including credential theft.
The following query identifies accounts that have logged on to compromised endpoints and have potentially had their credentials stolen.
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.cobaltstrike.com/
https://attack.mitre.org/software/S0154/
This query was originally published in the threat analytics report, Motivated miners.
Doublepulsar is a backdoor developed by the National Security Agency (NSA). First disclosed in 2017, it is now used by many malicious actors. Software patches are available.
The following query detects activity broadly associated with campaigns that use DoublePulsar to exploit web servers.
See Detect DoublePulsar execution for a query that detects possible DoublePulsar execution events.
References:
https://www.microsoft.com/wdsi/threats/malware-encyclopedia-description?Name=Trojan:Win32/DoublePulsar&threatId=-2147239036
https://www.scmagazine.com/home/security-news/cybercrime/doublepulsar-malware-spreading-rapidly-in-the-wild-following-shadow-brokers-dump/
https://support.microsoft.com/help/4013389/title
Doublepulsar is a backdoor developed by the National Security Agency (NSA). First disclosed in 2017, it is now used by many malicious actors. Software patches are available.
The following query detects activity broadly associated with campaigns that use DoublePulsar to exploit web servers.
See Detect DoublePulsar execution for a query that detects possible DoublePulsar execution events.
References:
https://www.microsoft.com/wdsi/threats/malware-encyclopedia-description?Name=Trojan:Win32/DoublePulsar&threatId=-2147239036
https://www.scmagazine.com/home/security-news/cybercrime/doublepulsar-malware-spreading-rapidly-in-the-wild-following-shadow-brokers-dump/
https://support.microsoft.com/help/4013389/title
Detects the clearing or configuration tampering of EventLog using utilities such as "wevtutil", "powershell" and "wmic".
This technique were seen used by threat actors and ransomware strains in order to evade defenses.
This technique were seen used by threat actors and ransomware strains in order to evade defenses.
Eventlog Cleared
Sigma
One of the Windows Eventlogs has been cleared. e.g. caused by "wevtutil cl" command execution
Detects the clearing of one of the Windows Core Eventlogs. e.g. caused by "wevtutil cl" command execution
Detects the clearing or configuration tampering of EventLog using utilities such as "wevtutil", "powershell" and "wmic".
This technique were seen used by threat actors and ransomware strains in order to evade defenses.
This technique were seen used by threat actors and ransomware strains in order to evade defenses.
This query checks for attempts to clear at least 10 log entries from event logs using wevtutil.
Use this query to look for alerts related to suspected ransomware and Cobalt Strike activity, a tool used in numerous ransomware campaigns
Find distinct evasion and execution activities.
Associated with the Robbinhood ransomware campaign.
Associated with the Robbinhood ransomware campaign.
The query checks for suspicious Tomcat process launches associated with likely exploitation of Confluence - CVE-2022-26134
Read more here:.
https://confluence.atlassian.com/doc/confluence-security-advisory-2022-06-02-1130377146.html
https://nvd.nist.gov/vuln/detail/CVE-2022-26134
Tags: #exploit #CVE-2022-26134
Read more here:.
https://confluence.atlassian.com/doc/confluence-security-advisory-2022-06-02-1130377146.html
https://nvd.nist.gov/vuln/detail/CVE-2022-26134
Tags: #exploit #CVE-2022-26134
// Look for attempts to use fsutil.exe to delete file system logs that can be used as forensic artifacts.
Detects attempts to clear Windows Event Logs using 'wevtutil' command-line utility or PowerShell cmdlets like 'Remove-EventLog' and 'Clear-EventLog'. This activity is often performed by adversaries to remove forensic evidence of their actions on a compromised system.
Detects the clearing of event logs within the Windows Event Viewer.
The analytic detects the clearing of Windows event logs by identifying Windows Security Event ID 1102 or System log event 104. This behavior is significant as it may indicate an attempt to cover tracks after malicious activities, hindering forensic investigations and allowing attackers to persist undetected.
The following analytic detects the usage of wevtutil.exe with the "clear-log" parameter in order to clear the contents of logs. It leverages data from Endpoint Detection and Response (EDR) agents, focusing on process names and command-line arguments. This activity is significant because clearing event logs can be an attempt to cover tracks after malicious actions, hindering forensic investigations. If confirmed malicious, this behavior could allow an attacker to erase evidence of their activities, making it difficult to trace their actions and understand the full scope of the compromise.
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