Threat Hunting Father

Mshta.exe is a Windows-native binary designed to execute Microsoft HTML Application (HTA) files. As its full name implies, Mshta can execute Windows Script Host code (VBScript and JScript) embedded within HTML in a network proxy-aware fashion. These capabilities make Mshta an appealing vehicle for adversaries to proxy execution of arbitrary script code through a trusted, signed utility, making it a reliable technique during both initial and later stages of an infection.

How do adversaries use Mshta?

There are four primary methods by which adversaries leverage Mshta to execute arbitrary VBScript and JScript:
- inline via an argument passed in the command line to Mshta
- file-based execution via an HTML Application (HTA) file
- COM-based execution for lateral movement
- by calling the RunHTMLApplication export function of mshtml.dll with rundll32.exe as an alternative to mshta.exe

ts, such as executing scripts

from suspicious locations or downloading content from unknown sources.
3. Check File Locations: Legitimate instances of MSHTA.exe are usually located in the "C:\Windows\System32" directory. If MSHTA.exe is running from a different location, especially from temporary or user profile directories, it could be a sig

4. Analyze Network Activity:

Monitor network traffic for connections initiated by MSHTA.exe. Suspicious network connections, especially to known malicious domains or IP addresses, could indicate malicious activity.

5. Behavioral Analysis:

Analyze the behavior of MSHTA.exe during its execution. Look for actions such as creating or modifying files, accessing sensitive system areas, or injecting code into other processes, which could be indicative of malicious behavior.

6. Check Digital Signatures:

Legitimate instances of MSHTA.exe are typically signed by Microsoft. Check the digital signature of the MSHTA.exe file to verify its authenticity. If the file is not signed or the signature is invalid, it could be a sign of tampering or malicious activity.

7. Use Endpoint Detection and Response (EDR) Tools:

EDR tools can provide real-time monitoring and analysis of endpoint activities, including processes like MSHTA.exe. These tools can help identify and respond to suspicious behavior associated with MSHTA.exe.