PE_CAOLYWA.B
W32/Cowya.b (McAfee); W32.Mumawow!gen (Symantec); Worm.Win32.Otwycal.d (Kaspersky); Trojan.Win32.Packer.Upack0.3.9 (ep) (Sunbelt); Win32/PEPatch.X (AVG)
Windows 2000, Windows XP, Windows Server 2003
![](/vinfo/imgFiles/legend.jpg)
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
834,560 bytes
EXE
No
18 Jun 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 deletes the following files:
- %Windows%\Tasks\0x01xx8p.exe
(Note: %Windows% is the Windows folder, which is usually C:\Windows.)
It adds the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\Data\
Config
Dropping Routine
This file infector drops the following files:
- %Windows%\windows.ext
- %System Root%\zzz.sys
- %Windows%\Tasks\explorer.ext
(Note: %Windows% is the Windows folder, which is usually C:\Windows.. %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)
This report is generated via an automated analysis system.
SOLUTION
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
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_LOCAL_MACHINE\SOFTWARE\Data
- Config
Step 3
Search and delete these components
- %Windows%\windows.ext
- %System Root%\zzz.sys
- %Windows%\Tasks\explorer.ext
Step 4
Scan your computer with your Trend Micro product to clean files detected as PE_CAOLYWA.B. 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.
Step 5
Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.
- %Windows%\Tasks\0x01xx8p.exe
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