Email-Worm.Win32.Scorpion

Technical Details

This is a dangerous worm that spreads via the Internet in infected e-mails. The worm itself is a Windows application written in Delphi and about 370K in size.

Upon being executed (by clicking on the attached file, for instance), it installs itself into the system, registers itself as a service process (hidden application), then sends infected messages (with its attached copy), and, depending on the system date, runs its payload routine.

Installation to System

The worm copies itself to the Windows system directory with a name randomly selected from the following variants:

Play.exe
Bigs as.exe
Zorro.exe
Honey.exe
Jefes.exe
Corte de pelo.exe
Tangas.exe
Canibal.exe
Picadita.exe
Josefina.exe

and registers that file in the Registry auto-run key:

HKEY_LOCAL_MACHINESoftwareMicrosoftWindowsCurrentVersionRun
Scorpion=%filename%

E-mail Spreading

The worm sends itself from infected machines as an attached file with random names as above, and with the Subject and message Body randomly selected from the following variants:

Subjects:

Sorpresa !!!
Este si que es un buen presente
Diviertanse
Todo debe estar limpio
Echale un ojo a esto
Buena PECHOnalidad
Con todo mi aprecio
El aguijon de Scorpion
Traseros
Mujeres

Message body:

Abrelo sin miedo que, no es ningun Virus
No tiene ningun Virus
Abrelo no hay PELIGRO, esta limpio de Virus
Mira que bueno esta esto
Espero que esto te guste
Scorpion hace de las suyas
Esto si esta interesante abrelo que no hay peligro
Dime si te gusto
No tiene Virus, asi que abranlo y disfrutenlo
Observa el gran poder de las mujeres en su parte trasera

To send infected messages, the worm connects to a SMTP server. The worm obtains the name of the SMTP server from the default-system settings.

A victim’s e-mail addresses are obtained from the WAB file (Windows Address Book). The messages also are sent each time to:

jajachistes@topica.com
tavojaja@yahoogroups.com
cartones@egroups.com
pensamientos@egroups.com
huateque@egroups.com
jacastro@geoline.net
forodelphi2000@yahoo.com.ar

The worm sends e-mails immediately upon the first start-up, then in time intervals, depending on its internal time counters.

Payloads and other

The worm finds and deletes all *.INF and *.SYS files on a drive where Windows is installed, and the system is destroyed due to this in most cases.

Starting in September, and the 15th of each month, the virus runs itself with some video effect.

The worm also creates and modifies the following registry keys:

HKEY_LOCAL_MACHINESoftwareScorpionHelp
Mail = Negro
Fack = Rojo

These keys indicate that: 1st key – e-mail messages have already been sent; 2nd key – INI and SYS files have been deleted.

Depending on its internal time counters, the worm also closes all active application windows, opens/closes the CD drive, blinks the Num/Caps/Scroll-lock keys, an displays 500 messages:

Scorpion ya est� aqu� !!!!