Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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This query was originally published in the threat analytics report, Ursnif (Gozi) continues to evolve.
Microsoft HTML Applications, or HTAs, are executable files that use the same technologies and models as Internet Explorer, but do not run inside of a web browser.
Mshta.exe is a Windows utility that provides a host for HTA files to run in. Although it has legitimate uses, attackers can use mshta.exe to run malicious Javascript or VBScript commands. The MITRE ATT&CK framework includes Mshta among its list of enterprise attack techniques.
The following query detects when mshta.exe has been run, which might include illegitimate usage by attackers.
References:
https://docs.microsoft.com/previous-versions/ms536496(v=vs.85)
https://attack.mitre.org/techniques/T1170/
Microsoft HTML Applications, or HTAs, are executable files that use the same technologies and models as Internet Explorer, but do not run inside of a web browser.
Mshta.exe is a Windows utility that provides a host for HTA files to run in. Although it has legitimate uses, attackers can use mshta.exe to run malicious Javascript or VBScript commands. The MITRE ATT&CK framework includes Mshta among its list of enterprise attack techniques.
The following query detects when mshta.exe has been run, which might include illegitimate usage by attackers.
References:
https://docs.microsoft.com/previous-versions/ms536496(v=vs.85)
https://attack.mitre.org/techniques/T1170/
'This query idenifies when rundll32.exe executes a specific set of inline VBScript commands
References: https://www.microsoft.com/security/blog/2021/03/04/goldmax-goldfinder-sibot-analyzing-nobelium-malware/
To use this analytics rule, make sure you have deployed the [ASIM normalization parsers](https://aka.ms/ASimProcessEvent)'
References: https://www.microsoft.com/security/blog/2021/03/04/goldmax-goldfinder-sibot-analyzing-nobelium-malware/
To use this analytics rule, make sure you have deployed the [ASIM normalization parsers](https://aka.ms/ASimProcessEvent)'
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.
'Extracts MDATP Alerts that indicate a command was executed by a web shell. Uses time window based querying to idneitfy the potential web shell location on the server, then enriches with Attacker IP and User Agent'
This query was originally published in the threat analytics report, OSX/SurfBuyer adware campaign.
It will return results if a shell script has furtively attempted to decode and save a file to a /tmp folder.
If discovered on your system, this kind of activity might be associated with SurfBuyer, which is adware that installs a browser extension to take control of several major web browsers, including Safari, Google Chrome, and Firefox.
It will return results if a shell script has furtively attempted to decode and save a file to a /tmp folder.
If discovered on your system, this kind of activity might be associated with SurfBuyer, which is adware that installs a browser extension to take control of several major web browsers, including Safari, Google Chrome, and Firefox.
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.
Snip3 is a family of related remote access trojans. Although the malware in this family contain numerous small variations, they all exhibit similar behaviors and techniques.
The following query looks for the method that Snip3 malware use to obfuscate PowerShell commands with UTF8 encoding. This technique is intended to evade detection from security products, and avoids the more standard switches used for encoding in malware such as Emotet.
At present, this method of encoding is much more rare, being seen largely with loader installation of RevengeRAT, AsyncRAT and other RATs used in campaigns targeting the aviation industry.
The following query looks for the method that Snip3 malware use to obfuscate PowerShell commands with UTF8 encoding. This technique is intended to evade detection from security products, and avoids the more standard switches used for encoding in malware such as Emotet.
At present, this method of encoding is much more rare, being seen largely with loader installation of RevengeRAT, AsyncRAT and other RATs used in campaigns targeting the aviation industry.
'The Exchange Powershell Snapin was loaded on a host, this allows for a Exchange server management via PowerShell.
Whilst this is a legitimate administrative tool it is abused by attackers to performs actions on a compromised
Exchange server. Hunt for unusual activity related to this Snapin including it being added on new hosts or by
new accounts.'
Whilst this is a legitimate administrative tool it is abused by attackers to performs actions on a compromised
Exchange server. Hunt for unusual activity related to this Snapin including it being added on new hosts or by
new accounts.'
This query looks for rundll32.exe or regsvr32.exe being spawned by abnormal processes: wscript.exe, powershell.exe, cmd.exe, pwsh.exe, cscript.exe.
Blog:
https://threathunt.blog/running-live-malware-for-threat-hunting-purposes/
Blog:
https://threathunt.blog/running-live-malware-for-threat-hunting-purposes/
This query was originally published in the threat analytics report, Emulation-evading JavaScripts.
Attackers in several ransomware campaigns have employed heavily obfuscated JavaScript code, in order to implant malware or execute malicious commands. The obfuscation is intended to help the code evade security systems and potentially escape sandbox environments.
The following query detects the creation of files with a .jse extension. Certain ransomware campaigns, such as Emotet, are known to employ encrypted JavaScript code that is saved to the target as .jse files.
See Detect potentially malicious .jse launch by File Explorer or Word for a similar technique.
Reference - https://www.microsoft.com/security/blog/2017/11/06/mitigating-and-eliminating-info-stealing-qakbot-and-emotet-in-corporate-networks/
Attackers in several ransomware campaigns have employed heavily obfuscated JavaScript code, in order to implant malware or execute malicious commands. The obfuscation is intended to help the code evade security systems and potentially escape sandbox environments.
The following query detects the creation of files with a .jse extension. Certain ransomware campaigns, such as Emotet, are known to employ encrypted JavaScript code that is saved to the target as .jse files.
See Detect potentially malicious .jse launch by File Explorer or Word for a similar technique.
Reference - https://www.microsoft.com/security/blog/2017/11/06/mitigating-and-eliminating-info-stealing-qakbot-and-emotet-in-corporate-networks/
This query was originally published in the threat analytics report, Trickbot: Pervasive & underestimated.
Trickbot is a very prevalent piece of malware with an array of malicious capabilities. Originally designed to steal banking credentials, it has since evolved into a modular trojan that can deploy other malware, disable security software, and perform command-and-control (C2) operations.
Trickbot is frequently spread through email. An attacker will send a target a message with an attachment containing a malicious macro. If the target enables the macro, it will write a JScript Encoded (JSE) file to disk (JScript is a Microsoft dialect of ECMAScript). The JSE file will then be launched using wscript.exe to perform a variety of malicious tasks, particularly reconnaissance.
The following query detects when Office applications have launched wscript.exe to run a JSE file.
See Detect rundll.exe being used for reconnaissance and command-and-control for another query related to Trickbot activity.
Reference - https://attack.mitre.org/software/S0266/
Trickbot is a very prevalent piece of malware with an array of malicious capabilities. Originally designed to steal banking credentials, it has since evolved into a modular trojan that can deploy other malware, disable security software, and perform command-and-control (C2) operations.
Trickbot is frequently spread through email. An attacker will send a target a message with an attachment containing a malicious macro. If the target enables the macro, it will write a JScript Encoded (JSE) file to disk (JScript is a Microsoft dialect of ECMAScript). The JSE file will then be launched using wscript.exe to perform a variety of malicious tasks, particularly reconnaissance.
The following query detects when Office applications have launched wscript.exe to run a JSE file.
See Detect rundll.exe being used for reconnaissance and command-and-control for another query related to Trickbot activity.
Reference - https://attack.mitre.org/software/S0266/
Looks for potential instances of bitlocker modifying registry settings to allow encryption, where it's executed via a .bat file.
'This query looks for messages related to file downloads of suspicious file types. This query uses the Exchange HttpProxy AOBGeneratorLog, you will need to onboard this log as a custom log under the table http_proxy_oab_CL before using this query.
Reference: https://www.microsoft.com/security/blog/2021/03/02/hafnium-targeting-exchange-servers/'
Reference: https://www.microsoft.com/security/blog/2021/03/02/hafnium-targeting-exchange-servers/'
'Powercat is a PowerShell implementation of netcat. Whilst it can be used as a legitimate administrative tool it can be abused by attackers to exfiltrate data. This query looks for command line activity downloading PowerCat.'
'Invoke-PowerShellTcpOneLine is a PowerShell script to create a simple and small reverse shell. It can be abused by attackers to exfiltrate data. This query looks for command line activity similar to Invoke-PowerShellTcpOneLine.'
The "Stolen Images" Bazarloader campaign uses fake copyright infingement contact form emails and malicious files pretending to contain "stolen images" to trick users into downloading the malware.
The pw protected zip attachment -> Word doc delivery method of Bazarloader utilizes Word to create an .hta file and launch it via MSHTA to connect to a malicious domain and pull down the Bazarloader paylaod.
ZLoader was delivered in a campaign in late summer 2021. This campaign was tweeted by @MsftSecIntel on twitter.
This query was originally published in the threat analytics report, Qakbot blight lingers, seeds ransomware
Qakbot is malware that steals login credentials from banking and financial services. It has been deployed against small businesses as well as major corporations. Some outbreaks have involved targeted ransomware campaigns that use a similar set of techniques. Links to related queries are listed under See also.
The following query detects possible attempts by Qakbot to execute malicious Javascript code.
Reference - https://www.microsoft.com/security/blog/2017/11/06/mitigating-and-eliminating-info-stealing-qakbot-and-emotet-in-corporate-networks/
Qakbot is malware that steals login credentials from banking and financial services. It has been deployed against small businesses as well as major corporations. Some outbreaks have involved targeted ransomware campaigns that use a similar set of techniques. Links to related queries are listed under See also.
The following query detects possible attempts by Qakbot to execute malicious Javascript code.
Reference - https://www.microsoft.com/security/blog/2017/11/06/mitigating-and-eliminating-info-stealing-qakbot-and-emotet-in-corporate-networks/
'breakdown of scripts running in the environment'
This query identifies the launch pattern associated with wastedlocker ransomware.
Reference writeup: https://symantec-enterprise-blogs.security.com/blogs/threat-intelligence/wastedlocker-ransomware-us
Reference writeup: https://symantec-enterprise-blogs.security.com/blogs/threat-intelligence/wastedlocker-ransomware-us
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