TROJ_MDROPPR.FL
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Trojan
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users. It may be manually installed by a user.
TECHNICAL DETAILS
2,591,077 bytes
EXE
Yes
01 Oct 2012
Arrival Details
This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.
It may be manually installed by a user.
Installation
This Trojan adds the following folders:
- %Program Files%\FlasshPlayer
- %Program Files%\FlasshPlayer\Uninstall
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.)
It drops the following files:
- %Application Data%\{Random Numbers 1}.exe
- %Application Data%\{Random Numbers 2}.exe
- %Application Data%\Microsoft\cssrss.exe
- %Application Data%\RES.exe
- %Program Files%\FlasshPlayer\Uninstall\IRIMG1.JPG
- %Program Files%\FlasshPlayer\Uninstall\IRIMG2.JPG
- %Program Files%\FlasshPlayer\Uninstall\uninstall.dat
- %Program Files%\FlasshPlayer\Uninstall\uninstall.xml
- %Program Files%\FlasshPlayer\lua5.1.dll
- %Program Files%\FlasshPlayer\uninstall.exe
- %User Startup%\lassa52.exe
- %User Temp%\FlasshPlayer Setup Log.txt
- %Windows%\bss.exe
- %Windows%\lassa52.exe
- %Windows%\livs.exe
- %Windows%\reas.exe
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Windows\Profiles\{user name}\Application Data on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Application Data on Windows NT, and C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003.. %Program Files% is the default Program Files folder, usually C:\Program Files.. %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.. %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003.. %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)
Autostart Technique
This Trojan creates the following registry entries to enable automatic execution of dropped component at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Key Name = "%Application Data%\Microsoft\cssrss.exe\Microsoft\cssrss.exe"
Other System Modifications
This Trojan adds the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
FlasshPlayer11.17.01
Other Details
This Trojan connects to the following possibly malicious URL:
- http://{BLOCKED}dreacharounds.info/umhttp/panel/bot.php
SOLUTION
9.200
9.436.04
02 Oct 2012
9.437.00
03 Oct 2012
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
Restart in Safe Mode
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.
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall
- FlasshPlayer11.17.01
- FlasshPlayer11.17.01
Step 4
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\Run
- Key Name = "%Application Data%\Microsoft\cssrss.exe\Microsoft\cssrss.exe"
- Key Name = "%Application Data%\Microsoft\cssrss.exe\Microsoft\cssrss.exe"
Step 5
Search and delete this folder
- %Program Files%\FlasshPlayer
Step 6
Search and delete these files
- %Application Data%\{Random Numbers 1}.exe
- %Application Data%\{Random Numbers 2}.exe
- %Application Data%\Microsoft\cssrss.exe
- %Application Data%\RES.exe
- %User Startup%\lassa52.exe
- %User Temp%\FlasshPlayer Setup Log.txt
- %Windows%\bss.exe
- %Windows%\lassa52.exe
- %Windows%\livs.exe
- %Windows%\reas.exe
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_MDROPPR.FL. 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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