Small.avu

Classification

Malware

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Small.avu, Trojan-Downloader.Win32.Small.avu, W32/Small.avu, Backdoor.Win32.Dumador.bl, Backdoor.Win32.Dumadoor.bl

Summary

We got several reports about the 'Small.avu' trojan downloader on May 24th, 2005. According to those reports the trojan was spammed to a large number of people in email messages. The trojan downloader is programmed to download and run a Dumador backdoor variant from a website.

Removal

Automatic action

Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.

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Technical Details

The trojan downloader's file is a PE executable 1648 bytes long, packed with FSG file compressor.

According to the reports the trojan downloader was spammed with email messages that looked like that:

Subject:

ISTE RUS CITIRLAR

Body:

SELAM BEYLER!!!!
NATASHALAR SIZLERI BEKLIYOR::::..
HERZAMAN BIR RUSYALI NATASHA ILE SEX DOLU BIR GECE YASAMAYI HEPINIZ
DUSUNMUSSUNUZDUR.ISTE FIRSAT.BU GERCEKLESEBILIR,YUZLERCE RUS KIZI
TURKIYEYE GELMEK ICIN SIZLERI BEKLIYOR.7/24 SIZINLE VE EMRINIZDE.
MAILIMIZDE KIZLARIMIZIN RESIMLERINI GOREBILIRSINIZ.BEGENIN,SECIN.VE SIZIN OLSUN.
GERISI SIZE KALMIS:::.

The trojan downloader's file was attached to these messages as 'ATTACH.RAR.EXE' file. When this file is run by a user, it attempts to download and run a variant of Dumador backdoor from the following website:

tr.distributed-hosting.com

We have reported the abuse to the ISP that hosts that website.

Date Created: -

Date Last Modified: -