Sophos

Troj/Zcrew

Category
Type
What to do
Prevalence low high

Summary

 
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Action

More Information

Troj/Zcrew is a backdoor Trojan that arrives as an self-extracting archive.

Troj/Zcrew propagates over the internet, penetrating NT-based computers with weak username/password combinations.

There are two variants, which drop different files after a successful log on.

Variant 1: drops the following files to winnt\system32:
bootdrv.dll
explorer.exe
iischace.dll
libparse.exe
navdb.dbx
psexec.exe
rcfg.ini
rconnect.conf
rconnect.exe
secure.bat
servudaemon.ini
svchost32.exe
v32driver.bat
web.swf

Variant 2: drops the following files to winnt\web\printers\:
activeX.ocx
bootdrv.dll
explore.DAT
explorer.exe
hidden32.exe
iischace.dll
libparse.exe
navdb.dbx
pirc.ini
psexec.exe
rconnect.conf
rconnect.exe
regkeyadd.bat
regkeyadd.reg
secure.bat
start.bat
str.vxd
svchost32.exe
v32driver.bat
web.swf

and several files in winnt\web\printers\images\www:
mdx.dll
moo.dll
readme.htm
shik.gif
views.mdx
webserv.mrc

Not all of these files are malicious - some are legitimate programs. The remote intruder interacts with the computer via IRC channels.

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