Incidents

IE feature exploited ITW

Quite a long time ago I contacted Microsoft regarding what I thought was a XSS vulnerability in IE.

Microsoft disagreed, preferring to call it a ‘feature’.

This feature allows javascript embedded into GIF files to be executed under certain circumstances. The javascript may point to an alternate domain (as is the case with XSS vulnerabilities).

And this is what I saw yesterday – a compromised site containing a modified GIF file which exploits this XSS vulnerability.

The GIF file contains an embedded iframe pointing to a malicious site. (Thankfully, the site is currently presenting a ‘file not found’ error message.)

Here’s the GIF:

This is one step more on from today’s common web site compromises where some javascript gets added to the main page.

Clicking “view source” doesn’t reveal any malicious code – and this makes a quick analysis of the threat more difficult.

Following this discovery we’ve contacted Microsoft again – hopefully they’ll reconsider their position on this issue.

IE feature exploited ITW

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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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