TROJ_DLOADR.AOI
Downloader (Symantec)
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Trojan
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
Downloaded from the Internet
This Trojan accesses certain websites to report infection and to get instructions on its download routines.
As per current analysis, the malware attempts to download certain files.
This Trojan may be downloaded by other malware/grayware from remote sites.
TECHNICAL DETAILS
49,664 bytes
EXE
Yes
23 Apr 2012
Downloads files
Arrival Details
This Trojan may be downloaded by the following malware/grayware from remote sites:
- TROJ_ARTIEF.AOI
It may be downloaded from the following remote sites:
- http://www.{BLOCKED}lue.net/sv//cache/yltyWwH.exe
Installation
This Trojan drops the following copies of itself into the affected system:
- %System Root%\Documents and Settings\All Users\Local Settings\Temp\msdubmna.com
It adds the following processes:
- wuauclt.exe
It injects itself into the following processes as part of its memory residency routine:
- wuauclt.exe
Autostart Technique
This Trojan adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer\Run
55011 = %System Root%\Documents and Settings\All Users\Local Settings\Temp\msdubmna.com
NOTES:
This Trojan accesses the following websites to report infection and to get instructions on its download routines:
- http://{BLOCKED}sadhasiodo.com/blog/image.php
- http://{BLOCKED}lililili.com/blog/image.php
- http://{BLOCKED}jadsdaskld.net/blog/image.php
As per current analysis, the malware attempts to download the following files:
- http://{BLOCKED}ing.net/images/flash.dll - corrupted archive
- http://{BLOCKED}ing.net/images/xaxa.txt - corrupted archive
- http://{BLOCKED}ing.net/images/java_blog.exe - detected as TSPY_ZBOT.CJKA
It then executes the downloaded file. As a result, malicious routines of the downloaded file are exhibited on the affected system.
SOLUTION
9.200
8.933.01
23 Apr 2012
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 malware/grayware files that dropped/downloaded TROJ_DLOADR.AOI
-
TROJ_ARTIEF.AOI
Step 3
Restart in Safe Mode
Step 4
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\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\Run
- 55011 = %System Root%\Documents and Settings\All Users\Local Settings\Temp\msdubmna.com
- 55011 = %System Root%\Documents and Settings\All Users\Local Settings\Temp\msdubmna.com
Step 5
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_DLOADR.AOI. 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.
Did this description help? Tell us how we did.