Malware descriptions

60 seconds before shutdown – again

We’ve decided to rename Net-Worm.Win32.Small.d to Net-Worm.Win32.Bozori.a.

Infection reports are coming mostly from the USA, with some high-profile targets being hit.

Shortly after Bozori.a was detected we found Bozori.b. This variant doesn’t seem very widespread at the moment.

Instead of wintbp.exe, Bozori.b has wintbpx.exe as the filename. Otherwise the two variants don’t differ much, both around 10KB in size.

Bozori.b’s MD5: 7ef9b103143c15563ee386846fd4db77

The worm makes use of an exploit to get introduced to the system. And this exploit is a buffer overflow which is likely to result in a crash of services.exe.
This will lead to the infamous “System Shutdown” pop-up box made notorious by Lovsan and Sasser.

With only 60 seconds on the clock, administrators will have a tough time cleaning this mess up.

60 seconds before shutdown – again

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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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