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

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.

The leap of a Cycldek-related threat actor

The investigation described in this article started with one such file which caught our attention due to the various improvements it brought to this well-known infection vector.

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