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Discovered: March 03, 2003
Updated: February 13, 2007 11:43:39 AM
Also Known As: I-Worm.Roron.51 [KAV], Win32/Roron.Z@mm [RAV], W32/Oror.gen.c@MM [McAfee]
Type: Worm
Systems Affected: Windows

W32.HLLW.Oror.AG@mm is a mass-mailing worm and a variant of W32.HLLW.Oror@mm . This worm attempts to spread using email, mIRC, KaZaA, network shares, and mapped drives. The email attachment will arrive with a .exe or .scr file extentions. W32.HLLW.Oror.AG@mm also attempts to terminate and remove various security products from the infected computer.

This threat is written in the C++ language and is compressed with UPX.

NOTE: Virus definitions dated prior to March 5, 2003 may detect this threat as W32.HLLW.Oror.Z@mm.

Antivirus Protection Dates

  • Initial Rapid Release version March 03, 2003
  • Latest Rapid Release version March 03, 2003
  • Initial Daily Certified version March 03, 2003
  • Latest Daily Certified version March 03, 2003
  • Initial Weekly Certified release date March 05, 2003

Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

Writeup By: Eric Chien

Discovered: March 03, 2003
Updated: February 13, 2007 11:43:39 AM
Also Known As: I-Worm.Roron.51 [KAV], Win32/Roron.Z@mm [RAV], W32/Oror.gen.c@MM [McAfee]
Type: Worm
Systems Affected: Windows

W32.HLLW.Oror.AG@mm is very similar to W32.HLLW.Oror.C@mm . W32.HLLW.Oror.AG@mm contains the following updated email messages. In addition, the worm may use a variety of strings to form other various random messages.

From:  support@mcafee.com
McAfee Antivirus warns about several new viruses exploiting
Microsoft Internet Explorer. They register themselves as ActiveX
controls and subsequently grant access to the local resources of
the visitors. This type of internet viruses is very dangerous,
because they delete various files of the operating system.

Due to the significant increase of viruses exploiting this vulnerability,
McAfee Antivirus supports clients of Microsoft Windows with
 patch, which
fixes this bug in Internet Explorer 5.5 and minor versions. Customers who
have applied this patch are already protected against the vulnerability
and do not need to take additional action.

McAfee Antivirus
McAfee Antivirus Monthly Report_

From: cards@e-greetings.com
Hello, if you are reading this letter, it means that a friend
of yours has sent it to you. The idea is to help you realize who
you are indeed. This is an interactive variant, based on the
original tests of Dhalai Lama, a great indian philosopher.
Before you open the test, you should make a wish. Answer to
the 5 questions honestly, after that you will recieve a number.
If you want your wish to come true you must send this letter
to that count of your friends. You can make the test only
once, because after that the results won't be real.

"If you want to enter the other's world,
you should explore your soul first" - Dhalai Lama.

P.S. This test is for personal use only, and should not
be used with commercial purposes.
Reveal Yourself

From: charts@mtve.com
Hi, mTV fans. We rely on you, our biggest
friends to help us choose together the best
songs for the beginning of the year. Our new
suggestions are:

  Robbie Williams - Feel
  Eminem - Lose Yourself
  T.A.T.U - All The Things She Said
  Jay Z - Bonnie & Clyde
  Foo Fighters - All My Life
  Avril Lavigne - I'm With You
  J.Lo ft. Lox - Jenny From The Block

You can vote with the attached web client,
or you can also visit our web site for a
complete list of the singers and their

mTV Europe,
mTV Europe Top10_

From: support@microsoft.com
Blagodarenie na dulgogodishnite tradicii na Microsoft v Bulgaria
i dobrata i suvestna rabota na vsichki neini podchineni, mojem
nai-nakraq da pozdravim bulgarskiq potrebitel s prevod na
Internet Explorer na bulgarski.

Tova e edno uspeshno produljenie na iniciativata za prevejdane na
Ms Office 2000
 na rodniq ni ezik. Update-a e bezplaten i e
podaruk po sluchai 10 godishninata na Microsoft v Bulgaria.

Nadqvame se bulgarskite potrebiteli da ostanat dovolni, koeto shte
bude nai-golemiq podaruk za nas.

Microsoft, Bulgaria.
Microsoft Bulgaria_

For more information, refer to the W32.HLLW.Oror.C@mm writeup.


Symantec Security Response encourages all users and administrators to adhere to the following basic security "best practices":

  • Use a firewall to block all incoming connections from the Internet to services that should not be publicly available. By default, you should deny all incoming connections and only allow services you explicitly want to offer to the outside world.
  • 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.
  • Ensure that programs and users of the computer use the lowest level of privileges necessary to complete a task. When prompted for a root or UAC password, ensure that the program asking for administration-level access is a legitimate application.
  • Disable AutoPlay to prevent the automatic launching of executable files on network and removable drives, and disconnect the drives when not required. If write access is not required, enable read-only mode if the option is available.
  • Turn off file sharing if not needed. If file sharing is required, use ACLs and password protection to limit access. Disable anonymous access to shared folders. Grant access only to user accounts with strong passwords to folders that must be shared.
  • Turn off and remove unnecessary services. By default, many operating systems install auxiliary services that are not critical. These services are avenues of attack. If they are removed, threats have less avenues of attack.
  • If a 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.
  • Configure your email server to block or remove email that contains file attachments that are commonly used to spread threats, such as .vbs, .bat, .exe, .pif and .scr files.
  • Isolate compromised computers quickly to prevent threats from spreading further. 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.
  • If Bluetooth is not required for mobile devices, it should be turned off. If you require its use, ensure that the device's visibility is set to "Hidden" so that it cannot be scanned by other Bluetooth devices. If device pairing must be used, ensure that all devices are set to "Unauthorized", requiring authorization for each connection request. Do not accept applications that are unsigned or sent from unknown sources.
  • For further information on the terms used in this document, please refer to the Security Response glossary.

Writeup By: Eric Chien

Discovered: March 03, 2003
Updated: February 13, 2007 11:43:39 AM
Also Known As: I-Worm.Roron.51 [KAV], Win32/Roron.Z@mm [RAV], W32/Oror.gen.c@MM [McAfee]
Type: Worm
Systems Affected: Windows

To remove this worm, read the Removal instructions in the W32.HLLW.Oror.C@mm writeup.

Writeup By: Eric Chien