TROJ_FAKEAV.CBO
Windows 2000, Windows XP, Windows Server 2003
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Trojan
Destructiveness: No
Encrypted: No
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.
It connects to certain URLs. It may do this to remotely inform a malicious user of its installation. It may also do this to download possibly malicious files onto the computer, which puts the computer at a greater risk of infection by other threats.
It deletes the initially executed copy of itself.
TECHNICAL DETAILS
462,848 bytes
EXE
Yes
13 Nov 2011
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 files:
- %System Root%\Documents and Settings\All Users\Application Data\{random folder name}\{random filename}
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)
It drops the following copies of itself into the affected system:
- %System Root%\Documents and Settings\All Users\Application Data\{random folder name}\{random filename}.exe
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)
It creates the following folders:
- %System Root%\Documents and Settings\All Users\Application Data\{random folder name}
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)
Autostart Technique
This Trojan adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\RunOnce
{random filename} = "%System Root%\Documents and Settings\All Users\Application Data\{random folder name}\{random filename}.exe"
Download Routine
This Trojan connects to the following malicious URLs:
- http://{BLOCKED}.{BLOCKED}.174.147/api/stats/install/{random}
Other Details
This Trojan deletes the initially executed copy of itself
SOLUTION
9.200
8.570.07
14 Nov 2011
8.571.00
14 Nov 2011
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
Identify and terminate files detected as TROJ_FAKEAV.CBO
- If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
- If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.
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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnce
- {random filename} = "%System Root%\Documents and Settings\All Users\Application Data\{random folder name}\{random filename}.exe"
- {random filename} = "%System Root%\Documents and Settings\All Users\Application Data\{random folder name}\{random filename}.exe"
Step 4
Search and delete this folder
- %System Root%\Documents and Settings\All Users\Application Data\{random folder name}
Step 5
Scan your computer with your Trend Micro product to delete files detected as TROJ_FAKEAV.CBO. 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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