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PE_VIRUX.A-2

January 28, 2013
 ALIASES:

TrojanDownloader:Win32/Renos.DZ (Microsoft); Generic Dropper.cx (McAfee); W32.Virut.CF (Symantec); Packed.Win32.Krap.ae (Kaspersky); Virus.Win32.Virut.ce (v) (Sunbelt); Win32/Virut (AVG)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 OVERALL RISK RATING:
 REPORTED INFECTION:

  • Threat Type: File infector

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This file infector arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

  TECHNICAL DETAILS

File Size:

115,204 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

28 Jan 2013

Arrival Details

This file infector arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This file infector drops the following copies of itself into the affected system:

  • {malware path and file name}.exe

Autostart Technique

This file infector adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Cognac = "{malware path and file name}.exe"

Other System Modifications

This file infector adds the following registry keys:

HKEY_CURRENT_USER\Software\Cognac

HKEY_CURRENT_USER\Software\XML

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Cognac
d00000002 = "1cdfda4"

HKEY_CURRENT_USER\Software\Cognac
d00000003 = "ca74847"

HKEY_CURRENT_USER\Software\Cognac
d00000006 = "1"

HKEY_CURRENT_USER\Software\Cognac
s00000002 = "xC7aKZ+O6wyPlq1krRM4sG7m2LFGsYtHjHOagBf10Uk/n4gL8s8xs9LeD5KQVh3/j+XFa0mnvQ=="

HKEY_CURRENT_USER\Software\Cognac
d00000006 = "2"

HKEY_CURRENT_USER\Software\Cognac
d00000006 = "3"

HKEY_CURRENT_USER\Software\Cognac
d00000006 = "4"

HKEY_CURRENT_USER\Software\Cognac
d00000006 = "5"

HKEY_CURRENT_USER\Software\Cognac
d00000006 = "6"

HKEY_CURRENT_USER\Software\Cognac
d00000006 = "7"

HKEY_CURRENT_USER\Software\Cognac
d00000006 = "8"

HKEY_CURRENT_USER\Software\Cognac
d00000006 = "9"

HKEY_CURRENT_USER\Software\Cognac
d00000006 = "a"

HKEY_CURRENT_USER\Software\Cognac
d00000006 = "b"

HKEY_CURRENT_USER\Software\Cognac
d00000006 = "c"

HKEY_CURRENT_USER\Software\Cognac
d00000006 = "d"

HKEY_CURRENT_USER\Software\Cognac
d00000006 = "e"

HKEY_CURRENT_USER\Software\Cognac
d00000006 = "f"

Other Details

This file infector connects to the following possibly malicious URL:

  • http://{BLOCKED}repository.com/resolution.php
  • http://{BLOCKED}repository.com/borders.php

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.300

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Restart in Safe Mode

[ Learn More ]

Step 3

Delete this registry key

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_CURRENT_USER\Software
    • Cognac
  • In HKEY_CURRENT_USER\Software
    • XML

Step 4

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • Cognac = "{malware path and file name}.exe"
  • In HKEY_CURRENT_USER\Software\Cognac
    • d00000002 = "1cdfda4"
  • In HKEY_CURRENT_USER\Software\Cognac
    • d00000003 = "ca74847"
  • In HKEY_CURRENT_USER\Software\Cognac
    • d00000006 = "1"
  • In HKEY_CURRENT_USER\Software\Cognac
    • s00000002 = "xC7aKZ+O6wyPlq1krRM4sG7m2LFGsYtHjHOagBf10Uk/n4gL8s8xs9LeD5KQVh3/j+XFa0mnvQ=="
  • In HKEY_CURRENT_USER\Software\Cognac
    • d00000006 = "2"
  • In HKEY_CURRENT_USER\Software\Cognac
    • d00000006 = "3"
  • In HKEY_CURRENT_USER\Software\Cognac
    • d00000006 = "4"
  • In HKEY_CURRENT_USER\Software\Cognac
    • d00000006 = "5"
  • In HKEY_CURRENT_USER\Software\Cognac
    • d00000006 = "6"
  • In HKEY_CURRENT_USER\Software\Cognac
    • d00000006 = "7"
  • In HKEY_CURRENT_USER\Software\Cognac
    • d00000006 = "8"
  • In HKEY_CURRENT_USER\Software\Cognac
    • d00000006 = "9"
  • In HKEY_CURRENT_USER\Software\Cognac
    • d00000006 = "a"
  • In HKEY_CURRENT_USER\Software\Cognac
    • d00000006 = "b"
  • In HKEY_CURRENT_USER\Software\Cognac
    • d00000006 = "c"
  • In HKEY_CURRENT_USER\Software\Cognac
    • d00000006 = "d"
  • In HKEY_CURRENT_USER\Software\Cognac
    • d00000006 = "e"
  • In HKEY_CURRENT_USER\Software\Cognac
    • d00000006 = "f"

Step 5

Restart in normal mode and scan your computer with your Trend Micro product for files detected as PE_VIRUX.A-2. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.


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