W32.Evaman.C@mm

[Joshua]

W32.Evaman.C@mm is a mass-mailing worm. It sends HTTP Get requests to the Web site, email.people.yahoo.com, to obtain email addresses. It also retrieves email addresses from Windows Address Book files and from the files with the extensions .adb, .asp, .cfg, .dbx, .dhtm, .eml, .htm, .html, .jse, .jsp, .mmf, .msg, .ods, .php, .pl, .sht, .shtm, .shtml, .tbb, .txt, .wab, and .xml.
W32.Evaman.C@mm uses its own SMTP engine to send itself to the email addresses that it finds.
The email will have one of these subjects:

SN: New secure mail
Secure delivery
failed transaction
Re: hello (Secure-Mail)
Re: Extended Mail
Delivery Status (Secure)
Re: Server Reply
SN: Server Status
This threat is compressed with UPX.
Type: Worm
Infection Length: 21,504 bytes


Systems Affected: Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows Server 2003, Windows XP
Systems Not Affected: DOS, EPOC, Linux, Macintosh, Macintosh OS X, Novell Netware, OS/2, UNIX






*
Intelligent Updater definitions are released daily, but require manual download and installation.
Click here to download manually.

**
LiveUpdate virus definitions are usually released every Wednesday.
Click here for instructions on using LiveUpdate.






Wild

Number of infections: 0 - 49
Number of sites: 0 - 2
Geographical distribution: Low
Threat containment: Easy
Removal: Moderate
Threat Metrics


Wild:
Low
Damage:
Medium
Distribution:
High



Damage

Payload Trigger: n/a
Payload: n/a
Large scale e-mailing: Emails itself to addresses found on a Yahoo website and found on the infected system.
Deletes files: n/a
Modifies files: n/a
Degrades performance: n/a
Causes system instability: n/a
Releases confidential info: n/a
Compromises security settings: May deactivate antivirus and/or desktop firewall applications on the infected system.
Distribution

Subject of email: SN: New secure mail Secure delivery failed transaction Re: hello (Secure-Mail) Re: Extended Mail Delivery Status (Secure) Re: Server Reply SN: Server Status
Name of attachment: mail message attachment transcript text document file readme followed by one of the following: .exe -txt.exe -htm.exe -txt.scr
Size of attachment: 21,504 bytes, vary for zip
Time stamp of attachment: n/a
Ports: n/a
Shared drives: n/a
Target of infection: n/a


When W32.Evaman.C@mm runs, it does the following:


May create a mutex "Northernlightmixed," which allows only one instance of the worm to run in memory.


Launches Notepad.exe.


Copies itself as one of the following:

%System%\winlibs.exe
%Temp%\winlibs.exe

Notes:
%System% is a variable. The worm locates the System folder and copies itself to that location. By default, this is C:\Windows\System (Windows 95/98/Me), C:\Winnt\System32 (Windows NT/2000), or C:\Windows\System32 (Windows XP).

%Temp% is a variable.


Creates one of the following registry keys, which the worm uses as an infection marker:

HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Explorer\winlibs

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\winlibs
Adds the value:
"winlibs.exe" = "%System%\winlibs.exe"

to one of these registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run

so that the worm runs when you start Windows.


Terminates the process if any of its module base names contain one of the following:

uba
mc
Mc
av
AV
cc
sym
Sym
nv
can
scn
java
xp.exe
ecur
nti
erve
sss
iru
ort
SkyNet
KV


Attempts to log off the current user, shut down the system, or shut down and restart the system, if the current system time is later than January 1st, 2006.


Sends random HTTP Get requests to the Web site, email.people.yahoo.com:80, to retrieve email addresses:


Retrieves email addresses from WAB files.


Retrieves email addresses from the files with the extensions .adb, .asp, .cfg, .dbx, .dhtm, .eml, .htm, .html, .jse, .jsp, .mmf, .msg, .ods, .php, .pl, .sht, .shtm, .shtml, .tbb, .txt, .wab, or .xml on the folders,

%Windir%\Temporary Internet Files
%USERPROFILE%\Local Settings\Temporary Internet Files
%System% folder on all fixed and RAM drives from C through Y.


Uses its own SMTP engine to send itself to the addresses that it finds.

The email has the following characteristics:

From: This is spoofed. The sender name may be one of the following

mike
jennifer
david
linda
susan
nancy
pamela
eric
kevin
mary
jessica
patricia
barbara
karen
sarah
robert
john
daniel
jason
joe

The domain name will be the recipient's domain name.

Subject: The subject is one of the following:

SN: New secure mail
Secure delivery
failed transaction
Re: hello (Secure-Mail)
Re: Extended Mail
Delivery Status (Secure)
Re: Server Reply
SN: Server Status


Attachment: This is composed of one of the following strings:

mail
message
attachment
transcript
text
document
file
readme

followed by one of the following:

.exe
-txt.exe
-htm.exe
-txt.scr
zip


Message: The message is in the format,

<recipient domain name> :: <part 1><recipient email address>.

<part 2>

<part3><recipient domain name>.

where,

<part 1> is one of the following,

Automatically Secure Delivery: for
Mail Delivery Server System: for
Extended secure mail message available at:
Secure Mail Server Notification: for
New mail secure method implement: for

<part 2> is one of the following,

New policy requested by mail server to returned mail
as a secure compiled attachment (Zip).
Now a new message is available as secure Zip file format.
Due to new policies on clients.
This message is available as a secure Zip file format
due to a new security policy.
For security measures this message has been packed as Zip format.
This is a newly added security feature.
New policy recommends to enclose all messages as Zip format.
Your message is available in this server notice.
You have received a message that implements secure delivery technology.
Message available as a secure Zip file.

<part 3> is one of the following,

This message is an automatically server notice
from Administration at
Server Notice: New security feature added. MSG:ID: 455sec86
from
New feature added for security reasons
from
Automatically server notice:,
Server reply from
New service policy for security added from


The worm does not send itself to the email addresses that contain any of the following:

.edu
Bug
ugs
bug
upport
ICROSOFT
icrosoft
oot
dmin
ymant
avp
ecur
@MM
ebmast
help
opho
inpris
omain
senet
panda
32.
@mm
msn
inux
umit
nfo
irus
buse
orton
cafee
spam
Spam
SPAM
ntivi
eport
user
inzip
inrar
rend
pdate
USER
ating
ample
ists
persk
ccoun
ompu
msdn
YOU
you
oogle
arsoft
otmail
sarc
soft
ware
.gov
.mil
cribe
list
eturn
omment
Sale
sale
CRIBE
gmail
ruslis
ibm
win





Security Responses encourage all users and administrators to adhere to the following basic security "best practices":

Turn off and remove unneeded services. By default, many operating systems install auxiliary services that are not critical, such as an FTP server, telnet, and a Web server. These services are avenues of attack. If they are removed, blended threats have less avenues of attack and you have fewer services to maintain through patch updates.
If a blended threat exploits one or more network services, disable, or block access to, those services until a patch is applied.
Always keep your patch levels up-to-date, especially on computers that host public services and are accessible through the firewall, such as HTTP, FTP, mail, and DNS services.
Enforce a password policy. Complex passwords make it difficult to crack password files on compromised computers. This helps to prevent or limit damage when a computer is compromised.
Configure your email server to block or remove email that contains file attachments that are commonly used to spread viruses, such as .vbs, .bat, .exe, .pif and .scr files.
Isolate infected computers quickly to prevent further compromising your organization. Perform a forensic analysis and restore the computers using trusted media.
Train employees not to open attachments unless they are expecting them. Also, do not execute software that is downloaded from the Internet unless it has been scanned for viruses. Simply visiting a compromised Web site can cause infection if certain browser vulnerabilities are not patched.


Removal using the W32Evaman.C@mm Removal Tool
Symantec Security Response has developed a removal tool to clean the infections of W32.Evaman.C@mm. Use this removal tool first, as it is the easiest way to remove this threat.

Manual Removal
The following instructions pertain to all current and recent Symantec antivirus products, including the Symantec AntiVirus and Norton AntiVirus product lines.


Disable System Restore (Windows Me/XP).
Update the virus definitions.
Restart the computer in Safe mode or VGA mode.
Run a full system scan and delete all the files detected as W32.Evaman.C@mm.
Delete the values that were added to the registry.
For specific details on each of these steps, read the following instructions.
1. To disable System Restore (Windows Me/XP
If you are running Windows Me or Windows XP, we recommend that you temporarily turn off System Restore. Windows Me/XP uses this feature, which is enabled by default, to restore the files on your computer in case they become damaged. If a virus, worm, or Trojan infects a computer, System Restore may back up the virus, worm, or Trojan on the computer.

Windows prevents outside programs, including antivirus programs, from modifying System Restore. Therefore, antivirus programs or tools cannot remove threats in the System Restore folder. As a result, System Restore has the potential of restoring an infected file on your computer, even after you have cleaned the infected files from all the other locations.

Also, a virus scan may detect a threat in the System Restore folder even though you have removed the threat.

For instructions on how to turn off System Restore, read your Windows documentation, or one of the following articles:
"How to disable or enable Windows Me System Restore"
"How to turn off or turn on Windows XP System Restore"


Note: When you are completely finished with the removal procedure and are satisfied that the threat has been removed, re-enable System Restore by following the instructions in the aforementioned documents.


For additional information, and an alternative to disabling Windows Me System Restore, see the Microsoft Knowledge Base article, "Antivirus Tools Cannot Clean Infected Files in the _Restore Folder," Article ID: Q263455.
2. To update the virus definitions
Symantec Security Response fully tests all the virus definitions for quality assurance before they are posted to our servers. There are two ways to obtain the most recent virus definitions:
Running LiveUpdate, which is the easiest way to obtain virus definitions: These virus definitions are posted to the LiveUpdate servers once each week (usually on Wednesdays), unless there is a major virus outbreak. To determine whether definitions for this threat are available by LiveUpdate, refer to the Virus Definitions (LiveUpdate).
Downloading the definitions using the Intelligent Updater: The Intelligent Updater virus definitions are posted on U.S. business days (Monday through Friday). You should download the definitions from the Symantec Security Response Web site and manually install them. To determine whether definitions for this threat are available by the Intelligent Updater, refer to the Virus Definitions (Intelligent Updater).

The Intelligent Updater virus definitions are available: Read "How to update virus definition files using the Intelligent Updater" for detailed instructions.
3. To restart the computer in Safe mode or VGA mode
Shut down the computer and turn off the power. Wait for at least 30 seconds, and then restart the computer in Safe mode or VGA mode.
For Windows 95, 98, Me, 2000, or XP users, restart the computer in Safe mode. For instructions, read the document, "How to start the computer in Safe Mode."
For Windows NT 4 users, restart the computer in VGA mode. 4. To scan for and delete the infected files
Start your Symantec antivirus program and make sure that it is configured to scan all the files.
For Norton AntiVirus consumer products: Read the document, "How to configure Norton AntiVirus to scan all files."
For Symantec AntiVirus Enterprise products: Read the document, "How to verify that a Symantec Corporate antivirus product is set to scan all files."
Run a full system scan.
If any files are detected as infected with W32.Evaman.C@mm, click Delete.

5. To delete the values from the registry

Important: It is strongly recommended that you back up the registry before making any changes to it. Incorrect changes to the registry can result in permanent data loss or corrupted files. Modify the specified keys only. Read the document, "How to make a backup of the Windows registry," for instructions.

Click Start > Run.

Type regedit

Then click OK.


Navigate to each of the following keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run


In the right pane, delete the value if it exists:

"Winlibs.exe"="%System%\Winlibs.exe"


Navigate to and delete the keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\
Explorer\Winlibs

HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\
Explorer\Winlibs


Exit the Registry Editor.


Restart the computer in Normal mode.