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PE_VALLA.A

October 07, 2013
 ALIASES:

Virus:Win32/Valla.2048 (Microsoft); W32/Valla.a (McAfee); W32.Valla.2048 (Symantec); Virus.Win32.Xorala (Kaspersky); Valla.a (v) (Sunbelt); Win32/Valla.2048 (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:

121,856 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

07 May 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.

Other System Modifications

This file infector adds the following registry keys:

HKEY_CURRENT_USER\Software\Microsoft\
winmine

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
winmine
Difficulty = "0"

HKEY_CURRENT_USER\Software\Microsoft\
winmine
Height = "9"

HKEY_CURRENT_USER\Software\Microsoft\
winmine
Width = "9"

HKEY_CURRENT_USER\Software\Microsoft\
winmine
Mines = "a"

HKEY_CURRENT_USER\Software\Microsoft\
winmine
Mark = "1"

HKEY_CURRENT_USER\Software\Microsoft\
winmine
AlreadyPlayed = "1"

HKEY_CURRENT_USER\Software\Microsoft\
winmine
Color = "1"

HKEY_CURRENT_USER\Software\Microsoft\
winmine
Sound = "0"

HKEY_CURRENT_USER\Software\Microsoft\
winmine
Xpos = "5"

HKEY_CURRENT_USER\Software\Microsoft\
winmine
Ypos = "5"

HKEY_CURRENT_USER\Software\Microsoft\
winmine
Time1 = "3e7"

HKEY_CURRENT_USER\Software\Microsoft\
winmine
Time2 = "3e7"

HKEY_CURRENT_USER\Software\Microsoft\
winmine
Time3 = "3e7"

HKEY_CURRENT_USER\Software\Microsoft\
winmine
Name1 = "Anonymous"

HKEY_CURRENT_USER\Software\Microsoft\
winmine
Name2 = "Anonymous"

HKEY_CURRENT_USER\Software\Microsoft\
winmine
Name3 = "Anonymous"

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

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\Microsoft
    • winmine

Step 3

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\winmine
    • Difficulty = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\winmine
    • Height = "9"
  • In HKEY_CURRENT_USER\Software\Microsoft\winmine
    • Width = "9"
  • In HKEY_CURRENT_USER\Software\Microsoft\winmine
    • Mines = "a"
  • In HKEY_CURRENT_USER\Software\Microsoft\winmine
    • Mark = "1"
  • In HKEY_CURRENT_USER\Software\Microsoft\winmine
    • AlreadyPlayed = "1"
  • In HKEY_CURRENT_USER\Software\Microsoft\winmine
    • Color = "1"
  • In HKEY_CURRENT_USER\Software\Microsoft\winmine
    • Sound = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\winmine
    • Xpos = "5"
  • In HKEY_CURRENT_USER\Software\Microsoft\winmine
    • Ypos = "5"
  • In HKEY_CURRENT_USER\Software\Microsoft\winmine
    • Time1 = "3e7"
  • In HKEY_CURRENT_USER\Software\Microsoft\winmine
    • Time2 = "3e7"
  • In HKEY_CURRENT_USER\Software\Microsoft\winmine
    • Time3 = "3e7"
  • In HKEY_CURRENT_USER\Software\Microsoft\winmine
    • Name1 = "Anonymous"
  • In HKEY_CURRENT_USER\Software\Microsoft\winmine
    • Name2 = "Anonymous"
  • In HKEY_CURRENT_USER\Software\Microsoft\winmine
    • Name3 = "Anonymous"

Step 4

Scan your computer with your Trend Micro product to clean files detected as PE_VALLA.A. 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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