PE_QUERVAR.A-O
Windows 2000, Windows XP, Windows Server 2003
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Threat Type: File infector
Destructiveness: No
Encrypted: Yes
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.
It prepends its codes to target files.
TECHNICAL DETAILS
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:
- %Application Data%\Microsoft\{random}.exe
- %Windows%\xpsp2res.dll
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Windows\Profiles\{user name}\Application Data on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Application Data on Windows NT, and C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003.. %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)
It drops the following non-malicious file:
- {Malware Path}\{random}.docx
File Infection
This file infector infects the following file types:
- .doc
- .docx
- .exe
It prepends its codes to target files.
Process Termination
This file infector terminates the following processes if found running in the affected system's memory:
- taskmgr.exe
NOTES:
This file infector avoids infecting files located in all logical drives that are labeled as the following:
- CDROM drives
- Unknown drives
If the file to be infected has the file extension .doc or .docx, it saves the infected file as {original file name of infected}xcod.scr. It then deletes the original copy of the infected file. Infected files are detected as PE_QUERVAR.A.
SOLUTION
Step 1
For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.
Step 3
Scan your computer with your Trend Micro product and note files detected as PE_QUERVAR.A-O
Step 4
Search and delete the file detected as PE_QUERVAR.A-O
Step 5
Scan your computer with your Trend Micro product to delete files detected as PE_QUERVAR.A-O. 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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