Malware descriptions

Malicious code spreading via MySQL server

We’ve received a new variant of Backdoor.Win32.Wootbot, an IRC Trojan. The file is detected as Backdoor.Win32.Wootbot.gen, but contains an additional function: it will penetrate machines with MySQL server installed.

When the malicious program launches it connects to one of a range of IRC servers where it listens for commands, including command to start propagating. Then it scans a given range of IP addresses and if it finds an open MySQL server port on one of the addresses, the program tries to gain administrator access. It does this by bruteforcing the administrator password using a list of passwords coded into the malicious program. If it succeeds, the worm sends its body to the victim machine, penetrating via a vulnerability which was identified in the middle of 2004, and launches itself on the victim machine.

In addition to its propagation routine, the malicious code has standard functions of IRC backdoors, which will give the remote malicious user almost complete control over the victim machine. The worm opens four ports, port 69 and three chosen at random.

Internet Storm Center estimates that several thousand machines have already been infected.

The malicious program doesn’t exploit any vulnerability for the initial connection to MySQL server. Bacause of this, administrators can protect their servers simply by choosing a strong password.

Malicious code spreading via MySQL server

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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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