Opinion

Bluelisting – pros and cons

I’m sure most of us are familiar with allowlisting. It’s the idea of filtering applications (or emails, depending on the context) and allowing only those that are explicitly listed.

Well, what about ‘bluelisting’, i.e using a database of digital fingerprints to find pornographic content on a drive?

It’s easy to see why such a solution might be attractive. It could help parents to shield their children from pornographic content. It could help businesses avoid the HR and legal fallout from the presence of such content on corporate systems and eliminate the hit on corporate bandwidth associated with pornographic downloads. And it could help law enforcement agencies track down those storing illegal images.

However, it seems to me that while such an approach may tell us ‘What?’ and ‘Where?’, it does little to tell us ‘Who?’ and ‘How?’; and these are the key questions in a forensic investigation. There have already been several cases of people accused of downloading pornographic content who have claimed that a Trojan was responsible for the download: man cleared of porn charges, trojan responsible for porn and new trial in porn case.

Bluelisting – pros and cons

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Reports

Sunburst backdoor – code overlaps with Kazuar

While looking at the Sunburst backdoor, we discovered several features that overlap with a previously identified backdoor known as Kazuar. Our observations shows that Kazuar was used together with Turla tools during multiple breaches in past years.

Lazarus covets COVID-19-related intelligence

As the COVID-19 crisis grinds on, some threat actors are trying to speed up vaccine development by any means available. We have found evidence that the Lazarus group is going after intelligence that could help these efforts by attacking entities related to COVID-19 research.

Sunburst: connecting the dots in the DNS requests

We matched private and public DNS data for the SUNBURST-malware root C2 domain with the CNAME records, to identify who was targeted for further exploitation. In total, we analyzed 1722 DNS records, leading to 1026 unique target name parts and 964 unique UIDs.

What did DeathStalker hide between two ferns?

While tracking DeathStalker’s Powersing-based activities in May 2020, we detected a previously unknown implant that leveraged DNS over HTTPS as a C2 channel, as well as parts of its delivery chain. We named this new malware “PowerPepper”.

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