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Worm:Win32/Conficker.B

Also Known As:

TA08-297A (other)
CVE-2008-4250 (other)
VU827267 (other)
Win32/Conficker.A (CA)
Mal/Conficker-A (Sophos)
Trojan.Win32.Agent.bccs (Kaspersky)
W32.Downadup.B (Symantec)

Summary

Worm:Win32/Conficker.B is a worm that infects other computers across a network by exploiting a vulnerability in the Windows Server service (SVCHOST.EXE). If the vulnerability is successfully exploited, it could allow remote code execution when file sharing is enabled. It may also spread via removable drives and weak administrator passwords. It disables several important system services and security products.

Microsoft strongly recommends that users apply the update referred to in Security Bulletin MS08-067 immediately.

Microsoft also recommends that users ensure that their network passwords are strong to prevent this worm from spreading via weak administrator passwords. More information is available here.

Symptoms

System Changes

The following system changes may indicate the presence of this malware:

* The following services are disabled or fail to run:
Windows Update Service
Background Intelligent Transfer Service
Windows Defender
Windows Error Reporting Services

* Some accounts may be locked out due to the following registry modification, which may flood the network with connections:
HKLM\SYSTEM\CurrentControl

Set\Services\Tcpip\Parameters
"TcpNumConnections" = "0x00FFFFFE"

* Users may not be able to connect to websites or online services that contain the following strings:
virus
spyware
malware
rootkit
defender
microsoft
symantec
norton
mcafee
trendmicro
sophos
panda
etrust
networkassociates
computerassociates
f-secure
kaspersky
jotti
f-prot
nod32
eset
grisoft
drweb
centralcommand
ahnlab
esafe
avast
avira
quickheal
comodo
clamav
ewido
fortinet
gdata
hacksoft
hauri
ikarus
k7computing
norman
pctools
prevx
rising
securecomputing
sunbelt
emsisoft
arcabit
cpsecure
spamhaus
castlecops
threatexpert
wilderssecurity
windowsupdate