Home Security Windows remote admin tool source code used to craft RAT

Malicious attackers have used the leaked source code of a popular remote access tool for Windows, known as Ammyy Admin, to create a remote access trojan which researchers at security firm Proofpoint have dubbed FlawedAmmyy.

The RAT is being used to gain access to victims' machines, steal files and also credentials and has been in use since the beginning of 2106, the researchers said.

FlawedAmmyy was seen recently in massive email campaigns on 5 and 6 March, and was the second-stage download in the campaign that began with the sending of messages containing zipped .url attachments.

On 5 March, messages were sent from addresses that spoofed the recipient's own domain, with subject lines indicating that the message had a receipt as attachment.

These .url files are interpreted by Windows as Internet shortcut files but because they begin with a "file://" patch, they end with the downloading and execution of a JavaScript file over the SMB protocol.

The JavaScript file, in turn, when executed, brings in the trojan downloader Quant Loader; this then fetches the FlawedAmmyy RAT.

The RAT has all the functionality of the original, legit software; it can do remote desktop control, act as a file system manager, provide proxy support and also allows audio chat.


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Sam Varghese

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Sam Varghese has been writing for iTWire since 2006, a year after the sitecame into existence. For nearly a decade thereafter, he wrote mostly about free and open source software, based on his own use of this genre of software. Since May 2016, he has been writing across many areas of technology. He has been a journalist for nearly 40 years in India (Indian Express and Deccan Herald), the UAE (Khaleej Times) and Australia (Daily Commercial News (now defunct) and The Age). His personal blog is titled Irregular Expression.


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