Malware descriptions

Nyxem.e’s dreaded 32 bytes

Somewhere, deep inside Nyxem.e’s 100K+ body, there is a dreaded block of 32 bytes. On the 3rd of every month, exactly 30 minutes after the infected system is started, Nyxem.e will use this block to overwrite all *.doc, *.xls, *.mdb, *.mde, *.ppt, *.pps, *.zip, *.rar, *.pdf, *.psd and *.dmp files on your disks.

Once this has happened, your 6MB presentation for the CEO, your vacation pictures and all the RAR and ZIP backups will look like this:

Or, in ASCII:

With the activation date drawing near, just make sure your system is not infected. Unlike GPCode, once the payload has hit, the chances of you getting your data back will be practically zero.

Nyxem.e’s dreaded 32 bytes

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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.

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.

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