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

Kimsuky’s GoldDragon cluster and its C2 operations

Kimsuky (also known as Thallium, Black Banshee and Velvet Chollima) is a prolific and active threat actor primarily targeting Korea-related entities. In early 2022, we observed this group was attacking the media and a think-tank in South Korea.

Andariel deploys DTrack and Maui ransomware

Earlier, the CISA published an alert related to a Stairwell report, “Maui Ransomware.” Our data should openly help solidify the attribution of the Maui ransomware incident to the Korean-speaking APT Andariel, also known as Silent Chollima and Stonefly.

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