Worm.Win32.Opasoft.a (a.k.a. Brasil)
WARNING: AS FAR AS WE KNOW NO ANTI VIRUS SCANNER HAS YET BEEN UPDATED TO STOP THIS VERSION.
Opasoft.a, also known as "Brazil".is a new variant of the "Opasoft" worm.
The differences are:
1. The original "Opasoft.a" worm is not compressed. The "Brasil"
variant is encrypted by the "PCPEC" PE EXE
file encryption utility and then compressed by
the "UPX" PE EXE files compression tool.
2. The text strings are patched. For example, the following strings are replaced:
"ScrSvr", "ScrSin" -> "Brasil"
"ScrSout" -> "Brasil!"
"scrupd" -> "puta!!"
"www.opasoft.com" -> www.n3t.com.br
As a result the "Brasil" modification behaves a bit differently, however the spreading and backdoor routines are exactly the same as with the original worm variant.
Installation
The Opasoft.a worm installs itself to the Windows directory under
the name "brasil.exe" or "brasil.pif"
(depending on the "Brasil" patch variant) and registers this file
in the auto-run registry key:
HKLM\Software\Microsoft\Windows\CurrentVersion\Run Brasil = %worm name%
Spreading
While infecting remote computers the Opasoft.a worm uploads itself under the "brasil.exe" or "brasil.pif" name, and writes a corresponding string to a remote WIN.INI file.
Backdoor
The backdoor routine goes to the www.n3t.com.br WEB-site and performs the following actions:
it downloads and executes its new version (if there is one) from
this site
it downloads and processes script files placed at this site
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