Two New Strains of Trojan Downloader on the Loose

MessageLabs, the leading provider of email security and management services to businesses, is warning computer users to be on their guard against two new Trojan downloaders being spammed out. MessageLabs has intercepted over 54,000 copies of email-borne malware since the early hours of today.

Both downloaders have the same email characteristics. The email purports to be a spam report coming spoofed from a admin@ address requesting users to take action in order to prevent there email account from being shut down.

Recipients are therefore being tricked into opening the malicious files, which once activated drops a cope of one of the executable files onto infected machines opening up there machines to hackers.

The first copy of strain one was intercepted today at 01:18 GMT, while the second strain was stopped at 02:06 GMT.

Email characteristics:

SUBJECT: Spam Report
ATTACHMENT: report.log.exe
BODY:

Dear user,

Your e-mail account was used to send a huge amount of unsolicited spam messages during the recent week. If you could please take 5-10 minutes out of your online experience and confirm the attached document so you will not run into any future problems with the online service.

If you choose to ignore our request, you leave us no choice but to cancel your membership.

Virtually yours,
Network Administrator Team

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Downloader-ABC

FILESIZE: 1680

COUNT: 20855

1ST SEEN: 2005-07-07 01:18:30

NAI: Downloader-ABC

FSEC: N/A

DETAILS:

This one is FSG-packed, it downloads

http:// www.distributed-hosting. com/ ne.exe

NAI: W32/Dumaru.gen@MM

FSEC: Backdoor.Win32.Dumador.cx

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Downloader-XZ

FILESIZE: 2779

COUNT: 33931

1ST SEEN: 2005-07-07 02:06:09

NAI: Downloader-XZ

FSEC: Trojan-Downloader.Win32.Small.arf

DETAILS:

Downloads

http: // www.zaminbank .net/ftp/ file.exe

NAI: PWS-Reox

FSEC: N/A

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Detection
MessageLabs detected this virus proactively, using its unique and patented Skepticâ„? predictive heuristics technology.