Incidents

Do you like photos?

This week we’ve seen a couple of IM-Worms peaking above the radar to an extent you can probably call epidemic levels.

Two of these were MSN-Worms. Each worm sends a link:

Each of the links lead to a different Trojan-downloader. The downloaders download a variety of adware and adware-related Trojans.

Moreover, IM-Worm.Win32.Licat.c is also downloaded, which in turn launches a new mass mailing of the original message. Nothing unusual, right?

Wrong! Both worms spread using links to .PIF files. But some of you might remember that Microsoft blocked messages containing “.pif”?

Yes they have, but… the MS block is case sensitive!

So the criminals used capital letters, “.PIF” and the network filters let the message flow right through. Other variations like .Pif, .pIf, and so on also work.

We have notified Microsoft of this and hope they take the necessary actions. In the meantime, users and admins should beware.

The funpic.de page has been taken down during the night and the uglyphotos link is dead and blocked by MSN. But there’s no doubt there will be new ones to replace it. Especially with the VML vulnerability still un-patched.

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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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