Malware descriptions

Trojan.Sejweek: a new variant

I blogged a week ago about a Trojan for mobile devices called Sejweek. We’ve just detected a new version – what’s changed in the course of a week?

First, the URL has changed: Sejweek.b (the latest variant) downloads an XML file from http://unique*****.com/*****/get.php, which is a different URL from the one used by the previous version.

Second, the XML file which the link leads to has been modified – now the file looks like this:

And third, although Sejweek still sends SMS message to a short, premium-pay number, it’s now sending them to 7122 (a different number to that used by the previous variant), and each SMS costs $10.

The one thing that hasn’t changed is that Sejweek will still send SMS messages every 11 seconds, so there’ll still be a severe impact on your account balance. And finally, do be careful: Sejweel disguises itself as a whole range of applications, so don’t download anything unless you’re sure you know what you’re getting.

Trojan.Sejweek: a new variant

Your email address will not be published. Required fields are marked *

 

Reports

Lazarus targets defense industry with ThreatNeedle

In mid-2020, we realized that Lazarus was launching attacks on the defense industry using the ThreatNeedle cluster, an advanced malware cluster of Manuscrypt (a.k.a. NukeSped). While investigating this activity, we were able to observe the complete life cycle of an attack, uncovering more technical details and links to the group’s other campaigns.

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.

Subscribe to our weekly e-mails

The hottest research right in your inbox