Incidents

The file infecting AdWare saga continues

We are currently seeing an increase in cases which involve file infecting AdWare.

These new viruses are more sophisticated than the one we previously reported and append malicious code to Windows’ explorer.exe. The viruses belong to the Virus.Win32.Bube family.

For example, Virus.Win32.Bube.d downloads AdWare and Trojans, including: AdWare.ISearch.d, Trojan-Clicker.Win32.Agent.bn, Trojan.Win32.LowZones.ai and PornWare.Dialer.Salc.

Disinfection in this case is tricky, as explorer.exe is an important Windows process. Additionally, the malware tries to prevent removal by disabling system restore, infecting the explorer.exe residing in %sysdir%dllcache and lowering overall system security.

Things can get extra complicated as an AV can block access to the infected explorer.exe. This is why we provide the following removal instructions.

Please note that this removal guide does not apply to KAV 5 series. KAV 5 can disinfect explorer.exe in normal mode. However a full system scan is still required to delete or disinfect other malicious files.

* Boot into safe mode.
* Start a full system scan
* While the scan is running, kill the explorer.exe process via taskmanager.
* Disinfect all files detected as Virus.Win32.Bube.
* Reboot.
* The system is now clean of Virus.Win32.Bube.

Notes:
* Make sure to use the extended bases to remove the AdWare that Virus.Win32.Bube. may have downloaded..
* Security related system settings may have been altered by Virus.Win32.Bube, so check your settings after disinfection.

The file infecting AdWare saga continues

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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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