MalwarePublished 28 Jul 2026

AutoIT Payload Injector , (Tue, Jul 28th)

Source SANS ISC Handlers Diary

remote

Description

For a long time, AutoIT[1] has been pretty common in the malware ecosystem. Threat actors still use it because it&#x27s easy to write and powerful. Indeed, it can perform all the required actions to inject a payload into a remote process as you&#x27ll see below.

Impact

The malware enables remote code execution via process injection into a trusted Windows process (charmap.exe), facilitating stealthy execution of a keylogger (VIPKeylogger). This compromises user confidentiality by logging keystrokes and potentially exfiltrating sensitive information. The persistence mechanism ensures the malware survives system reboots. The use of legitimate system utilities and AutoIT scripting complicates detection and removal.

Defensive guidance

Mitigation involves user education to recognize phishing emails, blocking malicious attachments, and employing endpoint detection solutions capable of identifying AutoIT-based injection techniques and suspicious use of charmap.exe. Monitoring for persistence registry keys and unusual process injection behavior is recommended.

Summary

The threat is a malware campaign utilizing AutoIT scripts to perform process injection. It begins with a phishing email delivering a RAR archive containing a VBS script that decodes a Base64 payload and decompresses it using PowerShell. The payload drops three files: an AutoIT3 interpreter executable, an AutoIT script, and encoded shellcode. The AutoIT script decodes the shellcode (XOR key 0xEC), launches the legitimate Windows charmap.exe process, and injects the shellcode into it using Windows API calls (OpenProcess, VirtualAllocEx, WriteProcessMemory, CreateRemoteThread, CloseHandle). The injected shellcode installs VIPKeylogger malware which communicates with a remote server. Persistence is established via a registry Run key. This demonstrates AutoIT's capability to perform sophisticated payload injection and malware delivery.

References

isc.sans.edu/diary/rss/33192 (opens in a new tab)

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Description

AI analysisMachine-generated, updated 30 Jul 2026, 15:49 UTC

References

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