A new spam campaign is using malicious CHM files to download and install Brazilian banking Trojans.

Brazilian firms are the latest targets in a spam campaign delivering CHM help files hiding links to bank Trojans.

Help files (.chm), disguised as fax report emails, are the latest trick cybercrooks are using to infect PCs with CryptoWall ransomware.

The CHM format is a Microsoft online extension file for accessing documentation and help files, and the compressed HTML format may hold text, images, tables, and links -- when used legitimately.

What steps do I need to take to change the default action on Windows XP and Windows 7 when someone tries to open a CHM file? I want the file extension to be associated with notepad.exe for ALL ...

Once the CHM file is opened, it will display the alleged password to open the document but also quietly downloads and executes a remote PowerShell script that contains backdoor functionality and ...

It is said that it can open files in a wide range of formats, including DjVu, XPS , which is similar to PDF, and CHM , which is a Windows help file, so I actually tried using it to see what kind ...

A new version of the Masslogger trojan has been targeting Windows users - now using a compiled HTML (CHM) file format to start the infection chain.

This version includes support of merged CHM and .COL files, support for external (relatively to the current topic) JS files, multiframe pages. Some of the product features are fast file open, ...