Malware descriptions

Email-Worm.Win32.Bagle.ax and Bagle.ay

There are new variants of Bagle circulating actively at the moment: Email-Worm.Win32.Bagle.ax and Email-Worm.Win32.Bagle.ay. When the worms search the victim machines for email addresses to send themselves to, they won’t send emails to addresses containing the following text:

  • @avp.
  • @foo
  • @iana
  • @messagelab
  • @microsoft
  • abuse
  • admin
  • anyone@
  • bsd
  • bugs@
  • cafee
  • certific
  • contract@
  • feste
  • free-av
  • f-secur
  • gold-certs@
  • google
  • help@
  • icrosoft
  • info@
  • kasp
  • linux
  • listserv
  • local
  • news
  • nobody@
  • noone@
  • noreply
  • ntivi
  • panda
  • pgp
  • postmaster@.
  • rating@
  • root@
  • samples
  • sopho
  • spam
  • support
  • unix
  • update
  • winrar
  • winzip

By doing this, the new Bagles are hiding from antivirus companies. This explains the relatively small number of samples that we’ve received so far.

Here’s a sample of what a Bagle.ay message looks like:

Full description of the new Bagles will be available in the Virus Encyclopedia in the near future.

Update If the infected attachment has a .cpl extension, it will be detected as Email-Worm.Win32.Bagle.at.

Email-Worm.Win32.Bagle.ax and Bagle.ay

Your email address will not be published. Required fields are marked *

 

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.

Subscribe to our weekly e-mails

The hottest research right in your inbox