Events

When paying taxes, don’t pay twice

Yesterday Colombian users got an email accusing them of committed tax fraud and evasion. This is a classic social engineering avenue: 
 

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To make the message more attractive, the criminals claim this is the 3rd notification and direct the user to click on the link to get “official” notifications with further details. 
The file is a .doc file with an initial VirusTotal detection of 0. 
 

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DIAN_caso-5415.doc


Since Microsoft Office blocks embedded macros by default, the cybercriminals go so far as to teach the victim how to enable macros inside of the initial Word file. I would call it a kind of tech support infection guide. 
 

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When the victims click, it downloads a new malicious binary from a hacked server located in Ecuador. 
 

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The binary reports the number of infections, so the criminals are counting the number of victims. 
The dropped binary (d87e5b814c4103710d6acde649e56e72) belongs to Ngrbot and it’s able to steal different valuables: passwords for online games, paypal, file sharing systems, social networks (including Facebook and twitter), online banking accounts, and more. 

The malware is obfuscated and leverages different techniques to make the analysis more difficult. It even checks the IP of the victim in order to ensure that victims are from the region of interest for the attacker. 
It looks like attackers will keep exploiting infection techniques based on embedding malicious macros in Office files

Kaspersky Anti-Virus detects the aforementioned threats as Trojan-Downloader.MSWord.Agent.s andWorm.Win32.Ngrbot.aecc

You may follow me on twitter: @dimitribest

When paying taxes, don’t pay twice

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Reports

Operation TunnelSnake

A newly discovered rootkit that we dub ‘Moriya’ is used by an unknown actor to deploy passive backdoors on public facing servers, facilitating the creation of a covert C&C communication channel through which they can be silently controlled. The victims are located in Africa, South and South-East Asia.

APT trends report Q1 2021

This report highlights significant events related to advanced persistent threat (APT) activity observed in Q1 2021. The summaries are based on our threat intelligence research and provide a representative snapshot of what we have published and discussed in greater detail in our private APT reports.

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