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
e-mail messages that looked like that:
ISTE RUS CITIRLAR
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:
We have reported the abuse to the ISP that hosts that website.
The downloaded Dumador backdoor variant is detected as
'Backdoor.Win32.Dumador.bl' with the following F-Secure
The trojan downloader is detected as 'W32/Small.avu' with the
following F-Secure Anti-Virus update:
Alexey Podrezov, May 24th, 2005;