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Thursday, 04 July 2019 08:56

New malware downloader spotted on Windows systems

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New malware downloader spotted on Windows systems Pixabay

The threat actor TA505 has begun distributing a new malware downloader known as AndroMut, the security firm Proofpoint claims, adding that this downloader pulls down a remote access trojan that it has called FlawedAmmyy.

The malware only affects Windows systems.

Two campaigns were observed downloading FlawedAmmyy, one targeting South Korea and using a Microsoft Office file containing macros that then ran a Msiexec command to bring in the FlawedAmmyy RAT.

The second campaign was aimed at financial institutions in Singapore, the UAE and the US. In this case, a Microsoft Word or Microsoft Excel file used macros to run commands that resulted in the malware being downloaded.

The AndroMut downloader achieved persistence on Windows systems by either scheduling a task that ran a created LNK file in the Recycle Bin or else used the Registry run method to regenerate itself.

Asked about the origins of TA505, a Proofpoint spokesperson told iTWire that its researchers had assessed with medium confidence that the individuals known as TA505 were originally from Eastern European countries.

"But they have no knowledge that TA505 is a state actor," the spokesperson added.

Proofpoint has tracked TA505 for some time and in January reported that the actor had begun to distribute a new Windows backdoor named ServHelper.

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Sam Varghese

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Sam Varghese has been writing for iTWire since 2006, a year after the site came 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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