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

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Reports

Lyceum group reborn

According to older public researches, Lyceum conducted operations against organizations in the energy and telecommunications sectors across the Middle East. In 2021, we have been able to identify a new cluster of the group’s activity, focused on two entities in Tunisia.

GhostEmperor: From ProxyLogon to kernel mode

While investigating a recent rise of attacks against Exchange servers, we noticed a recurring cluster of activity that appeared in several distinct compromised networks. With a long-standing operation, high profile victims, advanced toolset and no affinity to a known threat actor, we decided to dub the cluster GhostEmperor.

APT trends report Q2 2021

This is our latest summary of advanced persistent threat (APT) activity, focusing on significant events that we observed during Q2 2021: attacks against Microsoft Exchange servers, APT29 and APT31 activities, targeting campaigns, etc.

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