Through this elegantly simple chain, legacy help files become Trojan horses, blending user interface tricks, trusted Windows binaries, and subtle network traffic to achieve a foothold that many security tools still underestimate. dmpdump analysts noted that the script also instantiates the HTML Help ActiveX control (adb880a6-d8ff-11cf-9377-00aa003b7a11) to execute a hidden command chain, leveraging the legitimate Windows binary forfiles.exe to avoid suspicious parent-child correlations. A malicious Microsoft Compiled HTML Help (CHM) file uploaded from Poland on 30 June 2025 has shown how a legacy documentation format can be repurposed into a potent delivery vehicle for modern malware. Named “deklaracja.chm,” the archive masquerades as a bank‐transfer declaration and opens with a benign receipt image, lulling victims into a false sense of security while concealing a sophisticated multistage payload. Cyber Security News is a Dedicated News Platform For Cyber News, Cyber Attack News, Hacking News & Vulnerability Analysis. Buried inside is an obfuscated index.htm whose JavaScript decodes a lengthy hexadecimal blob, dynamically writes HTML, and silently downloads a disguised cabinet archive (desktop.mp3) via the deprecated “ tag. With years of experience under his belt in Cyber Security, he is covering Cyber Security News, technology and other news. Targeting Polish entities, it shows how a seemingly obsolete file type can pierce contemporary endpoint defenses, paving the way for credential theft, espionage, or destructive follow-on operations. Tushar is a Cyber security content editor with a passion for creating captivating and informative content.
This Cyber News was published on cybersecuritynews.com. Publication date: Mon, 14 Jul 2025 09:40:10 +0000