ACM_DLOADR.BWD
Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
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 drops the following file(s)/component(s):
- c:\crbcdo.log
- %Application Data%\Sogouexplorer\config.xml
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.)
Other System Modifications
This Trojan adds the following registry entries as part of its installation routine:
HKEY_CURRENT_USER\SOFTWARE\Microsoft\
Internet Explorer\Main
Start Page = "http://www.hao123.com/?tn=99182691_hao_pg"
Other Details
This Trojan connects to the following possibly malicious URL:
- http://{BLOCKED}b.{BLOCKED}n.com/errinfo.asp?errs=
- http://www.{BLOCKED}3.com/?tn=99182691_hao_pg
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
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_CURRENT_USER\SOFTWARE\Microsoft\Internet Explorer\Main
- Start Page = "http://www.hao123.com/?tn=99182691_hao_pg"
- Start Page = "http://www.hao123.com/?tn=99182691_hao_pg"
Step 3
Search and delete these files
- c:\crbcdo.log
- %Application Data%\Sogouexplorer\config.xml
Step 4
Scan your computer with your Trend Micro product to delete files detected as ACM_DLOADR.BWD. 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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