Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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This query helps hunt for emails with malicious attachments based on SH256 hash from external IOC source
'This will check for Rare User Agent strings over the last 3 days. This can indicate potential probing of your IIS servers.'
Jupyter, otherwise known as SolarMarker, is a malware family and cluster of components known for its info-stealing and backdoor capabilities that mainly proliferates through search engine optimization manipulation and malicious advertising in order to successfully encourage users to download malicious templates and documents. This malware has been popular since 2020 and currently is still active as of 2021.
These queries was originally published in the threat analytics report, Attacks on gov't, think tanks, NGOs.
As described further in Analysis of cyberattack on U.S. think tanks, non-profits, public sector by unidentified attackers, there was a very large spear-phishing campaign launched in November 2019.
The attackers would gain access to a target by having the user click on a link to a compromised website and download a .zip archive.
Once established on a target's device, the attackers used a malicious DLL named cyzfc.dat to execute additional payloads. They would call a function in the malicious DLL via the legitimate Windows process, rundll32.exe, to connect directly to their command-and-control (C2) servers.
The following queries detect activity associated with the malicious DLL, cyzfc.dat., used in this campaign.
Reference - https://docs.microsoft.com/windows-server/administration/windows-commands/rundll32
As described further in Analysis of cyberattack on U.S. think tanks, non-profits, public sector by unidentified attackers, there was a very large spear-phishing campaign launched in November 2019.
The attackers would gain access to a target by having the user click on a link to a compromised website and download a .zip archive.
Once established on a target's device, the attackers used a malicious DLL named cyzfc.dat to execute additional payloads. They would call a function in the malicious DLL via the legitimate Windows process, rundll32.exe, to connect directly to their command-and-control (C2) servers.
The following queries detect activity associated with the malicious DLL, cyzfc.dat., used in this campaign.
Reference - https://docs.microsoft.com/windows-server/administration/windows-commands/rundll32
This query looks for user content downloads from dropbox that originate from a link/redirect from a 3rd party site.
File sharing sites such as Dropbox are often used for hosting malware on a reputable site.
Read more about download URL data and about this attack vector in this blog post:.
Https://techcommunity.microsoft.com/t5/Threat-Intelligence/Hunting-tip-of-the-month-Browser-downloads/td-p/220454.
Tags: #DownloadUrl, #Referer, #Dropbox.
File sharing sites such as Dropbox are often used for hosting malware on a reputable site.
Read more about download URL data and about this attack vector in this blog post:.
Https://techcommunity.microsoft.com/t5/Threat-Intelligence/Hunting-tip-of-the-month-Browser-downloads/td-p/220454.
Tags: #DownloadUrl, #Referer, #Dropbox.
In this query, we are looking for Url clicks on emails which get actioned by Zerohour auto purge
This query visualises emails submitted as false negatives by admins where emails where already detected by MDO but there was an admin policy override
This query helps reviewing Malware, Phishing, Spam emails caught per day
This query helps reviewing top 100 malicious senders
This query helps hunting for top outbound recipient domains which are sending inbound emails with threats
The query helps detect emails associated with the open redirector URL campaign using Defender for Office 365 data.
This query helps report on who Previewed/Downloaded email messages using the Email entity page in Defender for Office 365
'Identifies IPs with failed attempts to sign in to one or more disabled accounts signed in successfully to another account.
To use this analytics rule, make sure you have deployed the [ASIM normalization parsers](https://aka.ms/ASimAuthentication)'
To use this analytics rule, make sure you have deployed the [ASIM normalization parsers](https://aka.ms/ASimAuthentication)'
'Surfaces any Defender Alert for Solorigate Events. In Microsoft Sentinel the SecurityAlerts table includes only the Device Name of the affected device, this query joins the DeviceInfo table to clearly connect other information such as
Device group, ip, logged on users etc. This way, the Microsoft Sentinel user can have all the pertinent device info in one view for all the the Solarigate Defender alerts.'
Device group, ip, logged on users etc. This way, the Microsoft Sentinel user can have all the pertinent device info in one view for all the the Solarigate Defender alerts.'
This rule identifies 'improbable travel' scenarios where a user successfully logs in from two geographically distant locations within a short time frame, suggesting potential account compromise or abuse, possibly related to Remote Employment Fraud (REF). It calculates the speed of travel required between consecutive login locations and flags events where the speed and distance exceed predefined thresholds. It also checks if the login country differs from the user's known work country.
This query shows the source of the AV detections (e.g., the website the file was downloaded from etc.).
Get the list of AV detections.
Get the list of AV detections.
Use this query to locate emails with subject indicators of a reply or forward, and the attachment is a .doc, or a .zip containing a .doc. Review results for suspicious emails.
IcedId can lead to ransomware
IcedId can lead to ransomware
This query visualises the original detection technology of emails submitted as spam false positive by admins
This query visualises the top admins performing false negative submissions
This query helps in checking the sender-recipient contact establishment status
In this detection approach, we correlate email from non-prevalent senders in the organization with impersonation intents
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