BKDR_ZEGOST.AEX
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Backdoor
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This backdoor 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
81,408 bytes
EXE
No
15 May 2012
Arrival Details
This backdoor 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 backdoor creates the following folders:
- %Windows%\AAD0081D
(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)
Other System Modifications
This backdoor adds the following registry keys:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Control\MediaResources\msvideo
HKEY_LOCAL_MACHINE\SYSTEM\InfoTime
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\InfoTime
InfoTime = "20120514"
Dropping Routine
This backdoor drops the following files:
- %Windows%\AAD0081D\JH.BAT
(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)
This report is generated via an automated analysis system.
SOLUTION
9.200
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 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\SYSTEM\CurrentControlSet\Control\MediaResources
- msvideo
- In HKEY_LOCAL_MACHINE\SYSTEM
- InfoTime
Step 3
Delete this registry value
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\SYSTEM\InfoTime
- InfoTime = "20120514"
Step 4
Search and delete this file
- %Windows%\AAD0081D\JH.BAT
Step 5
Search and delete this folder
- %Windows%\AAD0081D
Step 6
Scan your computer with your Trend Micro product to delete files detected as BKDR_ZEGOST.AEX. 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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