PE_AZERO.A-O
TrojanDownloader:Win32/VB (Microsoft); Downloader-CGI (McAfee); W32.SillyFDC (Symantec); Trojan-Downloader.Win32.Tolsty.a, Trojan-Downloader.Win32.VB.hdm (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Virus:W32/Varp.gen!A (FSecure)
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Trojan
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This Trojan 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
Arrival Details
This Trojan 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 Trojan creates the following folders:
- %User Profile%\Applications Data
- %User Profile%\Applications Data\Microsoft
- %User Profile%\Applications Data\Media Player
- %User Profile%\Applications Data\Office
- %User Profile%\Applications Data\Word
- %User Profile%\Applications Data\Excel
- %User Profile%\Applications Data\Windows
(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)
Dropping Routine
This Trojan drops the following files:
- %System%\maxtrox.txt
- %Desktop%.ini
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.. %Desktop% is the current user's desktop, which is usually C:\Documents and Settings\{User Name}\Desktop on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\Desktop on Windows Vista and 7.)
This report is generated via an automated analysis system.
SOLUTION
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
Search and delete these components
- %System%\maxtrox.txt
- %Desktop%.ini
Step 3
Search and delete these folders
- %User Profile%\Applications Data
- %User Profile%\Applications Data\Microsoft
- %User Profile%\Applications Data\Media Player
- %User Profile%\Applications Data\Office
- %User Profile%\Applications Data\Word
- %User Profile%\Applications Data\Excel
- %User Profile%\Applications Data\Windows
Step 4
Scan your computer with your Trend Micro product to delete files detected as PE_AZERO.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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