Email-Worm.Win32.Calposa

Parent class: VirWare

Viruses and worms are malicious programs that self-replicate on computers or via computer networks without the user being aware; each subsequent copy of such malicious programs is also able to self-replicate. Malicious programs which spread via networks or infect remote machines when commanded to do so by the “owner” (e.g. Backdoors) or programs that create multiple copies that are unable to self-replicate are not part of the Viruses and Worms subclass. The main characteristic used to determine whether or not a program is classified as a separate behaviour within the Viruses and Worms subclass is how the program propagates (i.e. how the malicious program spreads copies of itself via local or network resources.) Most known worms are spread as files sent as email attachments, via a link to a web or FTP resource, via a link sent in an ICQ or IRC message, via P2P file sharing networks etc. Some worms spread as network packets; these directly penetrate the computer memory, and the worm code is then activated. Worms use the following techniques to penetrate remote computers and launch copies of themselves: social engineering (for example, an email message suggesting the user opens an attached file), exploiting network configuration errors (such as copying to a fully accessible disk), and exploiting loopholes in operating system and application security. Viruses can be divided in accordance with the method used to infect a computer:

• file viruses
• boot sector viruses
• macro viruses
• script viruses

Any program within this subclass can have additional Trojan functions. It should also be noted that many worms use more than one method in order to spread copies via networks.

Class: Email-Worm

Email-Worms spread via email. The worm sends a copy of itself as an attachment to an email message or a link to its file on a network resource (e.g. a URL to an infected file on a compromised website or a hacker-owned website). In the first case, the worm code activates when the infected attachment is opened (launched). In the second case, the code is activated when the link to the infected file is opened. In both case, the result is the same: the worm code is activated. Email-Worms use a range of methods to send infected emails. The most common are: using a direct connection to a SMTP server using the email directory built into the worm’s code using MS Outlook services using Windows MAPI functions. Email-Worms use a number of different sources to find email addresses to which infected emails will be sent: the address book in MS Outlook a WAB address database .txt files stored on the hard drive: the worm can identify which strings in text files are email addresses emails in the inbox (some Email-Worms even “reply” to emails found in the inbox) Many Email-Worms use more than one of the sources listed above. There are also other sources of email addresses, such as address books associated with web-based email services.

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Platform: Win32

Win32 is an API on Windows NT-based operating systems (Windows XP, Windows 7, etc.) that supports execution of 32-bit applications. One of the most widespread programming platforms in the world.

Description

Technical Details

Calposa is a worm virus spreading via the Internet as an attachment to infected emails as well as through the Kazaa file sharing network. The worm itself is a Windows PE EXE file about 57KB in length and is written in Visual Basic.

The infected email messages have the following attributes:

Subject: Anti-Virus Programs are corrupting your Software!

Body:

Want to know why you get junk mail? Well Here is proof that AV's are corrupting your programs and Sell your Private information to Web Company's! Why do you think there are so much virus's out there? well its these Company's that spread them and then sell you there product to delete them! check it out now... (p.s. its attatched)

Attach: ActiveX.exe, or Telnet.exe, or MSWord.exe

The worm activates from an infected email only when a user clicks on the attached file. The worm then installs itself to the system and runs its spreading routine and payload.

Installing
While installing the worm copies itself to the system under the following names:

C:WindowsActiveX.exe
C:WindowsSCR.exe
C:WindowsExplorer.exe
C:WindowsTelnet.exe
C:WindowsMSWord.exe
C:WindowsFUCK_AVs.exe
C:Windowsregedit.exe
C:WindowsMixer.exe
C:WINDOWSSystemExplorer.exe

The worm does not register any of these files neither in system registry auto-run key, nor in any else "auto-run" key or command.

Spreading: Email
To send infected messages the worm uses MS Outlook and sends messages to all addresses found in Outlook address book.

Spreading: Kazaa
The worm copies itself to the "C:Program FilesKaZaaMy Shared Folder" directory with following names:

norton_crack.exe
UT3_full_crack.exe
Windows_Hack.exe
Sims_Patch.exe

If this directory is a Kazaa file-sharing directory, the worm will spread over the Kazaa network.

Payload
The worm displays the message:

UH OH WORM!
... Calposa by Industry @ ANVXgroup ...

The worm writes to the "c:WindowsSystem.ini" file following data:

[About]
Author = Industry
VXgroup = ANVXgroup (Auxnet)
Virus = ANVX (WIN32.calposa@mm)
Shouts to = Indovirus, mANiAC89, Retro, Iwing, and every one else.
Fuck = Fuck all AV's, we keep you in a job so give us a bit of slack!
To the rest = ANVX the one and only!

On April 1st the worm deletes all files in following directories:

 C:Windows C:WindowsSystem32 C:WindowsSystem C:Windowsinf C:Program FilesKazaa

then it deletes the file:

 C:AutoExec.bat

and displays the message:

Industry ...ping? pong!...

On February 16th the worm displays a red colored picture with a text "ANVX by industry" on it.

On April 2nd the worm displays the message:

UH OH WORM! ... Second Release From Industry ...

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