Malware descriptions

Backdoor.Win32.Agent.uu aka Spamthru

It’s interesting to see the lengths malware authors have gone to secure their income. Recently, Joe Stewart from SecureWorks published a very nice description of a Trojan which in an attempt to keep other “competitors” out, installs an antivirus which it uses to keep the system clean. Unsurprisingly, the antivirus which the Trojan installs is KAV – specifically, a version of KAV for Wingate.

Up until now, most of the antivirus tools installed by trojans have been either rogue SpySheriff-like products or free disinfection tools like Microsoft’s MSRT. Which is why it’s really odd to see a real antivirus application being installed by a Trojan.

Detection for this thing is now available as Backdoor.Win32.Agent.uu.

Backdoor.Win32.Agent.uu aka Spamthru

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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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