TROJ_REVETON.YZV
W32/Reveton.AJ!tr(Fortinet), Ransom:Win32/Reveton.Y(Microsoft), Trojan-Ransom.Win32.Foreign.kxgk(Kaspersky), Win32/Reveton.AJ trojan(NOD32)
Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
![](/vinfo/imgFiles/legend.jpg)
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
90,624 bytes
DLL
Yes
23 Jun 2014
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:
- %All Users Profile%\Application Data\RUNDLL32.EXE-{random}.txt
(Note: %All Users Profile% is the All Users or Common profile folder, which is C:\Documents and Settings\All Users in Windows 2000, XP, and Server 2003, and C:\ProgramData in Windows Vista and 7.)
Autostart Technique
This Trojan drops the following file(s) in the Windows User Startup folder to enable its automatic execution at every system startup:
- %User Startup%\explorer.lnk
(Note: %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup.)
Other System Modifications
This Trojan adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Multimedia\DrawDib
vga.drv 1276x849x32(BGR 0) = "31,31,31,31"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion
ACID = "U000015"
It modifies the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\winmgmt\Parameters
ServiceDll = "%All Users Profile%\Application Data\{random}\{malware name}"
(Note: The default value data of the said registry entry is "%System%\wbem\WMIsvs.dll" .)
SOLUTION
9.700
10.882.03
24 Jun 2014
10.883.00
24 Jun 2014
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
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_REVETON.YZV. 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.
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\Multimedia\DrawDib
- vga.drv 1276x849x32(BGR 0) = "31,31,31,31"
- vga.drv 1276x849x32(BGR 0) = "31,31,31,31"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion
- ACID = "U000015"
- ACID = "U000015"
Step 4
Restore this modified 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\SYSTEM\ControlSet001\Services\winmgmt\Parameters
- From: ServiceDll = "%All Users Profile%\Application Data\{random}\{malware name}"
To: ServiceDll = "%System%\wbem\WMIsvs.dll"
- From: ServiceDll = "%All Users Profile%\Application Data\{random}\{malware name}"
Step 5
Search and delete these files
- %User Startup%\explorer.lnk
- %All Users Profile%\Application Data\RUNDLL32.EXE-{random}.txt
Step 6
Restart in Safe Mode
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