Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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'This rule identifies communication with hosts that have a domain name that might have been generated by a Domain Generation Algorithm (DGA).
DGAs are used by malware to generate rendezvous points that are difficult to predict in advance. This detection uses the top 1 million domain names to build a model of what normal domains look like nad uses the model to identify domains that may have been randomly generated by an algorithm. You can modify the triThreshold and dgaLengthThreshold query parameters to change Analytic Rule sensitivity. The higher the numbers, the less noisy the rule is.
This analytic rule uses [ASIM](https://aka.ms/AboutASIM) and supports any built-in or custom source that supports the ASIM WebSession schema (ASIM WebSession Schema)'
DGAs are used by malware to generate rendezvous points that are difficult to predict in advance. This detection uses the top 1 million domain names to build a model of what normal domains look like nad uses the model to identify domains that may have been randomly generated by an algorithm. You can modify the triThreshold and dgaLengthThreshold query parameters to change Analytic Rule sensitivity. The higher the numbers, the less noisy the rule is.
This analytic rule uses [ASIM](https://aka.ms/AboutASIM) and supports any built-in or custom source that supports the ASIM WebSession schema (ASIM WebSession Schema)'
'This query combines different SQL alerts with CommonSecurityLogs and AuditLogs helping analysts /investigate any possible SQL related attacks faster
thus reducing Mean Time To Respond'
thus reducing Mean Time To Respond'
'Identifies a match across various data feeds for domains, hashes and IP IOC related to Mercury
Reference: https://www.microsoft.com/security/blog/2022/08/25/mercury-leveraging-log4j-2-vulnerabilities-in-unpatched-systems-to-target-israeli-organizations/'
Reference: https://www.microsoft.com/security/blog/2022/08/25/mercury-leveraging-log4j-2-vulnerabilities-in-unpatched-systems-to-target-israeli-organizations/'
Remote Monitoring and Management (RMM) programs are IT to manage remote endpoints. Attackers have begun to abuse these programs to persist or provide C2 channels.
https://github.com/jischell-msft/RemoteManagementMonitoringTools
https://github.com/jischell-msft/RemoteManagementMonitoringTools
'Identifies IP addresses that may be performing DNS lookups associated with common currency mining pools.
This analytic rule uses [ASIM](https://aka.ms/AboutASIM) and supports any built-in or custom source that supports the ASIM DNS schema'
This analytic rule uses [ASIM](https://aka.ms/AboutASIM) and supports any built-in or custom source that supports the ASIM DNS schema'
This query can be used to explore any instances where a terminated individual (i.e. one who has an impending termination date but has not left the company) downloads a large number of files from a non-Domain network address.
'CreepyDrive uses OneDrive for command and control, however, it makes regular requests to predicatable paths.
This detecton will alert when over 20 sequences are observed in a single day.'
This detecton will alert when over 20 sequences are observed in a single day.'
'This detection will identify network requests in HTTP proxy data that contains Base64 encoded IP addresses. After identifying candidates the query joins with DeviceNetworkEvents to idnetify any machine within the network using that IP address. Alerts indicate that the IP address of a machine within your network was seen with it's IP address base64 encoded in an outbound web request. This method of egressing the IP was seen used in POLONIUM's RunningRAT tool, however the detection is generic.'
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 remote code execution on a vulnerable Linux server.
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 remote code execution on a vulnerable Linux server.
'Any Alerts that fired related to a given IpAddress during the range of +6h and -3d'
'This query looks for command lines that contain a public IP address. Attackers may use a hard coded IP for C2 or exfiltration.
This query can be filtered to exclude network prefixes that are known to be legitimate.'
This query can be filtered to exclude network prefixes that are known to be legitimate.'
Tor
KQL
This query looks for Tor client, or for a common Tor plugin called Meek.
We query for active Tor connections, but could have alternatively looked for active Tor runs (ProcessCreateEvents) or Tor downloads (DeviceFileEvents).
To read more about this technique, see:.
Tor: https://attack.mitre.org/wiki/Software/S0183#Techniques_Used.
Meek plugin: https://attack.mitre.org/wiki/Software/S0175.
Multi-hop proxy technique: https://attack.mitre.org/wiki/Technique/T1188.
Tags: #Tor, #MultiHopProxy, #CnC.
We query for active Tor connections, but could have alternatively looked for active Tor runs (ProcessCreateEvents) or Tor downloads (DeviceFileEvents).
To read more about this technique, see:.
Tor: https://attack.mitre.org/wiki/Software/S0183#Techniques_Used.
Meek plugin: https://attack.mitre.org/wiki/Software/S0175.
Multi-hop proxy technique: https://attack.mitre.org/wiki/Technique/T1188.
Tags: #Tor, #MultiHopProxy, #CnC.
This query was originally published in the threat analytics report, Exploitation of CVE-2019-0708 (BlueKeep).
CVE-2019-0708, also known as BlueKeep, is a critical remote code execution vulnerability involving RDP. Soon after its disclosure, the NSA issued a rare advisory about this vulnerability, out of concern that it could be used to quickly spread malware. Attackers have since used this vulnerability to install cryptocurrency miners on targets.
Microsoft has issued updates for this vulnerability, as well as guidance for protecting operating systems that we no longer support. Microsoft Defender ATP also contains behavioral detections for defending against this threat.
The following query locates Windows 7 or Windows Server 2008 machines initiating outbound connections to internal or public IP addresses on TCP port 3389. It filters out common RDP programs and scanning tools and shows the number of connections per machine. It can identify machines with relatively intense outbound network activity on the common RDP port (TCP/3389). You can use it to find processes that might be scanning for possible targets or exhibiting worm-like behavior.
References:
https://nvd.nist.gov/vuln/detail/CVE-2019-0708
https://www.nsa.gov/News-Features/News-Stories/Article-View/Article/1865726/nsa-cybersecurity-advisory-patch-remote-desktop-services-on-legacy-versions-of/
https://www.wired.com/story/bluekeep-hacking-cryptocurrency-mining/
https://portal.msrc.microsoft.com/security-guidance/advisory/CVE-2019-0708
https://support.microsoft.com/help/4500705/customer-guidance-for-cve-2019-0708
https://www.microsoft.com/security/blog/2019/11/07/the-new-cve-2019-0708-rdp-exploit-attacks-explained/
CVE-2019-0708, also known as BlueKeep, is a critical remote code execution vulnerability involving RDP. Soon after its disclosure, the NSA issued a rare advisory about this vulnerability, out of concern that it could be used to quickly spread malware. Attackers have since used this vulnerability to install cryptocurrency miners on targets.
Microsoft has issued updates for this vulnerability, as well as guidance for protecting operating systems that we no longer support. Microsoft Defender ATP also contains behavioral detections for defending against this threat.
The following query locates Windows 7 or Windows Server 2008 machines initiating outbound connections to internal or public IP addresses on TCP port 3389. It filters out common RDP programs and scanning tools and shows the number of connections per machine. It can identify machines with relatively intense outbound network activity on the common RDP port (TCP/3389). You can use it to find processes that might be scanning for possible targets or exhibiting worm-like behavior.
References:
https://nvd.nist.gov/vuln/detail/CVE-2019-0708
https://www.nsa.gov/News-Features/News-Stories/Article-View/Article/1865726/nsa-cybersecurity-advisory-patch-remote-desktop-services-on-legacy-versions-of/
https://www.wired.com/story/bluekeep-hacking-cryptocurrency-mining/
https://portal.msrc.microsoft.com/security-guidance/advisory/CVE-2019-0708
https://support.microsoft.com/help/4500705/customer-guidance-for-cve-2019-0708
https://www.microsoft.com/security/blog/2019/11/07/the-new-cve-2019-0708-rdp-exploit-attacks-explained/
This query was originally published in the threat analytics report, MailSniper Exchange attack tool.
MailSniper is a tool that targets Microsoft Exchange Server. The core function is to connect to Exchange Server and search through emails. In support of this, it can perform reconnaissance, collection, exfiltration, and credential theft. MailSniper is used both by red teams running penetration tests, and by malicious actors.
Microsoft Defender Security Center may record the following alerts during and after an attack:
1. Global mail search on Exchange using MailSniper
2. Exchange mailbox or mail folder search using MailSniper
3. Enumeration of Active Directory usernames using MailSniper
4. Enumeration of the Exchange GAL using MailSniper
5. Access to Exchange inboxes using MailSniper
6. Password spraying using MailSniper
7. Enumeration of domains and user accounts using MailSniper
The following query detects activity commonly associated with attacks run with MailSniper.
Reference - https://github.com/dafthack/MailSniper
MailSniper is a tool that targets Microsoft Exchange Server. The core function is to connect to Exchange Server and search through emails. In support of this, it can perform reconnaissance, collection, exfiltration, and credential theft. MailSniper is used both by red teams running penetration tests, and by malicious actors.
Microsoft Defender Security Center may record the following alerts during and after an attack:
1. Global mail search on Exchange using MailSniper
2. Exchange mailbox or mail folder search using MailSniper
3. Enumeration of Active Directory usernames using MailSniper
4. Enumeration of the Exchange GAL using MailSniper
5. Access to Exchange inboxes using MailSniper
6. Password spraying using MailSniper
7. Enumeration of domains and user accounts using MailSniper
The following query detects activity commonly associated with attacks run with MailSniper.
Reference - https://github.com/dafthack/MailSniper
'This detection will alert when RunningRAT URI parameters or paths are detect in an HTTP request.
Id the device blocked this communication presence of this alert means the RunningRAT implant is likely still executing on the source host.'
Id the device blocked this communication presence of this alert means the RunningRAT implant is likely still executing on the source host.'
'Identifies a match across various data feeds for domains related to an actor tracked by Microsoft as Star Blizzard.'
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.
This query was originally published in the threat analytics report, "Exchange Server zero-days exploited in the wild".
In early March 2021, Microsoft released patches for four different zero-day vulnerabilities affecting Microsoft Exchange Server. The vulnerabilities were being used in a coordinated attack. For more information on the vulnerabilities, visit the following links:
1. CVE-2021-26855
2. CVE-2021-26857
3. CVE-2021-26858
4. CVE-2021-27065
The following query finds evidence of a reverse shell being loaded using a technique associated with the Nishang penetration testing framework. This might indicate an attacker has remote access to the device.
More queries related to this threat can be found under the See also section of this page.
Reference - https://msrc-blog.microsoft.com/2021/03/02/multiple-security-updates-released-for-exchange-server/
In early March 2021, Microsoft released patches for four different zero-day vulnerabilities affecting Microsoft Exchange Server. The vulnerabilities were being used in a coordinated attack. For more information on the vulnerabilities, visit the following links:
1. CVE-2021-26855
2. CVE-2021-26857
3. CVE-2021-26858
4. CVE-2021-27065
The following query finds evidence of a reverse shell being loaded using a technique associated with the Nishang penetration testing framework. This might indicate an attacker has remote access to the device.
More queries related to this threat can be found under the See also section of this page.
Reference - https://msrc-blog.microsoft.com/2021/03/02/multiple-security-updates-released-for-exchange-server/
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.
Query 1 shows you any network communication happened from endpoints to a specific Remote IP or Remote URL.
Ensure to update RemoteIP and RemoteURL variable.
For questions @MiladMSFT on Twitter or milad.aslaner@microsoft.com by email.
Ensure to update RemoteIP and RemoteURL variable.
For questions @MiladMSFT on Twitter or milad.aslaner@microsoft.com by email.
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