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PE_CAOLYWA.E

October 23, 2013
 Modified by: Mark Joseph Manahan
 ALIASES:

Virus:Win32/Otwycal.A (Microsoft), W32/Cowya.a (McAfee), W32.Wowinzi.A (Symantec)

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 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:

Varies

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

08 Apr 2009

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 and executes the following files:

  • %Windows%\windows.ext - PE_CAOLYWA.*-O

(Note: %Windows% is the Windows folder, which is usually C:\Windows.)

File Infection

This is the Trend Micro detection for files infected by:

  • PE_CAOLYWA.*-O

  SOLUTION

Minimum Scan Engine:

9.300

VSAPI OPR PATTERN File:

5.955

VSAPI OPR PATTERN Date:

09 Apr 2009

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

Remove the malware/grayware file dropped/downloaded by PE_CAOLYWA.E

     PE_CAOLYWA.*-O

Step 3

Scan your computer with your Trend Micro product to delete files detected as PE_CAOLYWA.E 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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