Azure Sentinel
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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.
Finds legitimate system32 or syswow64 executables being run under a different name and in a different location.
The rule will require tuning for your environment.
MITRE: Masquerading https://attack.mitre.org/techniques/T1036.
Get a list of all processes run, except those run from system32 or SysWOW64.
The rule will require tuning for your environment.
MITRE: Masquerading https://attack.mitre.org/techniques/T1036.
Get a list of all processes run, except those run from system32 or SysWOW64.
DarkSide
KQL
Use this query to look for running DarkSide ransomware behavior in the environment
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.
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