Cumulative updates from the Virus Lab

We released our last cumulative update at the end of this January. What are the advantages for our customers?

  • Antivirus database updates are now significantly smaller. Previously, we needed to release the entire database to include all fixes. Now the database is divided into smaller segments, which allows us to release updates as small as 50 KB.
  • All changes can be implemented quickly. Previously, customers often needed to wait for cumulative updates for certain types of changes in our databases. Now all changes can be implemented in our daily updates.

However, our new system of antivirus updates is available only via the Kaspersky Updater module.

Cumulative updates from the Virus Lab

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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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