Summary
Fantibag.B is a trojan that installs a packet filter for preventing of downloading AV companies database updates and security patches. It is related to recent Bagle/Mitglieder trojans.
Detailed Description
Fantibag.B is a trojan that installs a packet filter for preventing of downloading AV companies database updates and security patches. It is related to recent Bagle/Mitglieder trojans.
Detailed Description
System installation
When the trojan's file is executed, it copies itself in Windows directory with the name 'firewall_anti.exe'. It installs the following registry key for ensuring it will be executed at system startup:
[HKLM\Software\Microsoft\Windows\CurrentVersion\Run]
"firewall_anti" = "%WinDir%\firewall_anti.exe"
The trojan drops a DLL 'firewall_anti.dll' in the Windows direcory and injects this file in address space of Internet Explorer.
Packet filtering
When the dropped DLL is activated, it modifies the network interface with Microsoft RAS packet filtering API. It adds a filter that blocks access to following AV companies and other security related sites:
ftpav.ca.com
www.pandasoftware.com
pandasoftware.com
clamav.net
www.clamav.net
www.bitdefender.com
bitdefender.com
ravantivirus.com
www.ravantivirus.com
drweb.ru
www.drweb.com
drweb.com
antivir.de
www.antivir.de
216.200.68.152
212.113.20.69
63.210.193.12
84.53.142.22
84.53.142.6
kaspersky.ru
grisoft.com
www3.ca.com
www.viruslist.ru
www.viruslist.com
www.trendmicro.com
www.symantec.com
www.sophos.com
www.networkassociates.com
www.nai.com
www.my-etrust.com
www.mcafee.com
www.kaspersky.ru
www.kaspersky.com
www.kaspersky-labs.com
www.grisoft.com
www.fastclick.net
www.f-secure.com
www.awaps.net
www.avp.ru
www.avp.com
www.avp.ch
windowsupdate.microsoft.com
viruslist.ru
viruslist.com
vil.nai.com
us.mcafee.com
updates5.kaspersky-labs.com
updates4.kaspersky-labs.com
updates3.kaspersky-labs.com
updates2.kaspersky-labs.com
updates1.kaspersky-labs.com
updates.symantec.com
update.symantec.com
trendmicro.com
symantec.com
support.microsoft.com
spd.atdmt.com
sophos.com
service1.symantec.com
securityresponse.symantec.com
secure.nai.com
rads.mcafee.com
phx.corporate-ir.net
office.microsoft.com
networkassociates.com
nai.com
my-etrust.com
msdn.microsoft.com
media.fastclick.net
mcafee.com
mast.mcafee.com
liveupdate.symantecliveupdate.com
liveupdate.symantec.com
kaspersky.com
kaspersky-labs.com
ids.kaspersky-labs.com
go.microsoft.com
ftp.sophos.com
ftp.kasperskylab.ru
ftp.f-secure.com
ftp.downloads2.kaspersky-labs.com
ftp.avp.ch
fastclick.net
f-secure.com
engine.awaps.net
downloads4.kaspersky-labs.com
downloads3.kaspersky-labs.com
downloads2.kaspersky-labs.com
downloads1.kaspersky-labs.com
downloads.microsoft.com
downloads-us3.kaspersky-labs.com
downloads-us2.kaspersky-labs.com
downloads-us1.kaspersky-labs.com
downloads-eu1.kaspersky-labs.com
download.microsoft.com
download.mcafee.com
dispatch.mcafee.com
customer.symantec.com
clicks.atdmt.com
click.atdmt.com
www.ca.com
ca.com
banners.fastclick.net
banner.fastclick.net
awaps.net
avp.ru
avp.com
avp.ch
atdmt.com
ar.atwola.com
ads.fastclick.net
ad.fastclick.net
ad.doubleclick.net
Source: http://www.f-secure.com/v-descs/fantibag_b.shtml