TROJ_RENOS.SMK3
TrojanDownloader:Win32/Renos.PG (Microsoft); Downloader-CEW.ak (McAfee); Trojan.Gen.2 (Symantec); PAK:UPX (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan.Generic.5710356 (FSecure)
Windows 2000, Windows XP, Windows Server 2003
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
162,304 bytes
EXE
No
10 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 copies of itself into the affected system:
- {malware path and file name}.exe
- %Windows%\Vxazaa.exe
(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)
Other System Modifications
This Trojan adds the following registry keys:
HKEY_CURRENT_USER\Software\VXEG3ZNNE5
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
Zones\_CHAR(0x03)_
It adds the following registry entries:
HKEY_CURRENT_USER\Software\VXEG3ZNNE5
VlyE5 = 1
HKEY_CURRENT_USER\Software\VXEG3ZNNE5
VlyN = 1cc9d22
HKEY_CURRENT_USER\Software\VXEG3ZNNE5
VlyE = 87ca421
Dropping Routine
This Trojan drops the following files:
- %Windows%\Tasks\{35DC3473-A719-4d14-B7C1-FD326CA84A0C}.job
(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_CURRENT_USER\Software
- VXEG3ZNNE5
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones
- _CHAR(0x03)_
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\VXEG3ZNNE5
- VlyE5=1
- In HKEY_CURRENT_USER\Software\VXEG3ZNNE5
- VlyN=1cc9d22
- In HKEY_CURRENT_USER\Software\VXEG3ZNNE5
- VlyE=87ca421
Step 4
Search and delete this file
Step 5
Scan your computer with your Trend Micro product to delete files detected as TROJ_RENOS.SMK3. 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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