Virus:W32/Expiro.C
Date discovered:22/07/2008
Type:File infector
In the wild:Yes
Reported Infections:Medium to high
Distribution Potential:Low to medium
Damage Potential:Medium
Static file:No
File size:~140.000 Bytes
IVDF version:7.00.05.147 - Tuesday, July 22, 2008

 General Method of propagation:
   • Infects files


Aliases:
   •  Symantec: W32.Kakavex
   •  Mcafee: W32/Expiro
   •  Kaspersky: Virus.Win32.Expiro.l
   •  Sophos: W32/Expiro-D
   •  Eset: Win32/Expiro.H
   •  Bitdefender: Win32.Kakavex.M

Similar detection:
   •  W32/Expirio.A
   •  W32/Expiro.B
   •  W32/Expiro.Q


Platforms / OS:
   • Windows 95
   • Windows 98
   • Windows 98 SE
   • Windows NT
   • Windows ME
   • Windows 2000
   • Windows XP
   • Windows 2003


Side effects:
   • Drops a file
   • Infects files
   • Lowers security settings
   • Steals information

 Files The following files are created:

– Non malicious file:
   • %home%\Local Settings\Application Data\%random character string%.dll

– A file that is for temporary use and it might be deleted afterwards:
   • %infected files%.ivr

 File infection Infector type:

Appender - The virus main code is added at the end of the infected file.
– The following sections are added to the infected file:
   • .data
   • .text
   • .data

Damaging - The files may be improperly infected. This results in infected files that are broken and crash.


Stealth:
 No stealth techinques used. It modifies the OEP (Original Entry Point) of the infected file to point to the virus code.


Self Modification:

Encrypted - The virus code inside the infected file is encrypted.


Method:

This direct-action infector actively searches for files.


Infection length:

Approximately 140.000 Bytes


The following files are infected:

By exact path:
   • *.exe

Files in any of the following directories:
   • %all directories%

 Stealing It tries to steal the following information:
– Windows Product ID
– Email account information obtained from the registry key: HKCU\Software\Microsoft\Internet Account Manager\Accounts

– The password from the following program:
   • INETCOMM Server

 Miscellaneous Mutex:
It creates the following Mutex:
   • kkq-vx_mtx%number%

Description inserted by Daniel Constantin on Thursday, March 4, 2010
Description updated by Daniel Constantin on Thursday, March 4, 2010

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