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Dridex, also known as Bugat and Cridex, is a form of malware that specializes in stealing bank credentials via a system that utilizes macros from Microsoft Word. [5]The targets of this malware are Windows users who open an email attachment in Word or Excel, causing macros to activate and download Dridex, infecting the computer and opening the victim to banking theft.
A macro virus can be spread through e-mail attachments, removable media, networks and the Internet, and is notoriously difficult to detect. [1] A common way for a macro virus to infect a computer is by replacing normal macros with a virus. The macro virus replaces regular commands with the same name and runs when the command is selected.
The new Emotet infections were delivered via TrickBot, to computers that were previously infected with TrickBot, and soon began sending malicious spam email messages with macro-laden Microsoft Word and Excel files as payloads. [15] On 3 November 2022, new samples of Emotet emerged attached as a part of XLS files attached within email messages.
The "list.doc" file contains a Visual Basic script that copies the infected file into a template file used by Word for custom settings and default macros. If the recipient opens the attachment, the infected file will be read to computer storage.
If the user does enable macros, they save and run a binary file that downloads the actual encryption Trojan, which will encrypt all files that match particular extensions. Filenames are converted to a unique 16 letter and number combination. Initially, only the .locky file extension was used for these encrypted files.
As a workaround before a patch was available, on December 28, 2005, Microsoft advised Windows users to unregister the dynamic-link library file shimgvw.dll (which can be done by executing the command regsvr32.exe /u shimgvw.dll from the Run menu or the command prompt) which invokes previewing of image files and is exploited by most of these ...