TROJ_RENOS.FRS
Microsoft: TrojanDownloader:Win32/Renos.NX ; Sophos: Mal/FakeAV-GX ; Sunbelt: Trojan.Win32.Generic!BT
Windows 2000, Windows XP, Windows Server 2003

Threat Type: Trojan
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
This Trojan may be dropped by other malware. It may be unknowingly downloaded by a user while visiting malicious websites. However, as of this writing, the said sites are inaccessible.
It uses Windows Task Scheduler to create a scheduled task that executes the dropped copy.
TECHNICAL DETAILS
Varies
PE
Yes
23 Dec 2010
Arrival Details
This Trojan may be dropped by other malware.
It may be unknowingly downloaded by a user while visiting malicious websites.
However, as of this writing, the said sites are inaccessible.
Installation
This Trojan drops the following files:
- %Windows%\Tasks\{62C40AA6-4406-467a-A5A5-DFDF1B559B7A}.job - task file to enable automatic execution of its copy
(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)
It drops the following copies of itself into the affected system:
- %Windows%\Cgowua.exe
(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)
It uses Windows Task Scheduler to create a scheduled task that executes the dropped copy.
Other System Modifications
This Trojan adds the following registry keys as part of its installation routine:
HKEY_CURRENT_USER\Software\H308CABBPI
Download Routine
This Trojan accesses the following websites to download files:
- http://{BLOCKED}n.com/1wave.php
Other Details
This Trojan connects to the following URL(s) to check for an Internet connection:
- vkontakte.ru
- soso.com
SOLUTION
8.900
7.721.00
23 Dec 2010
12/23/2010 12:00:00 AM
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_RENOS.FRS
- 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 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. Before you could do this, you must restart in Safe Mode. For instructions on how to do this, you may refer to this page If the preceding step requires you to restart in safe mode, you may proceed to edit the system registry.
- In HKEY_CURRENT_USER\Software
- H308CABBPI
- H308CABBPI
Step 4
Search and delete this file
Step 5
Scan your computer with your Trend Micro product to delete files detected as TROJ_RENOS.FRS. 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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