Malware descriptions

New Worm.SymbOS.Lasco.a

Analysis of the new virus mentioned in the previous posting showed that it’s a SymbianOS worm, based on Cabir source code, that spreads itself via BlueTooth. It also has a file infection functionality.

Upon execution, the virus searches for nearby BlueTooth devices (those which are in discoverable mode) and tries to transmit itself to any accessible ones. It also initiates a drive-wide scan for SIS-files and tries to infect them by inserting virus code directly into an SIS archive.

We’ve called this virus Worm.SymbOS.Lasco.a. An antivirus database update is already available.

A detailed description of the virus will be available in the Virus Encyclopedia in the near future.

UPDATE: the description of Lasco.a is now online.

New Worm.SymbOS.Lasco.a

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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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