TROJ_DROPPER.OPU
PWS:Win32/Stealer.M (Microsoft); Trojan.Dropper (Symantec); Trojan.Win32.Buzus.bsuu (Kaspersky); Net-Worm.Win32.Kolab.ehp (v) (Sunbelt); Trojan horse Generic_r.BU (AVG)
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
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 creates the following folders:
- %Application Data%\Microsoft\Beaver's_SMS_Bomber.exe_Url_4wbvbezvv4mjxpvtzn2wk5ilia2x33py
- %Application Data%\Microsoft\Beaver's_SMS_Bomber.exe_Url_4wbvbezvv4mjxpvtzn2wk5ilia2x33py\1.0.0.0
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.)
Other System Modifications
This Trojan modifies the following file(s):
- %Application Data%\GDIPFONTCACHEV1.DAT
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.)
It modifies the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
GDIPlus
FontCachePath = "%Application Data%"
(Note: The default value data of the said registry entry is %User Profile%\Local Settings\Application Data.)
Dropping Routine
This Trojan drops the following files:
- %User Temp%\Beaver's SMS Bomber.exe
- %User Temp%\u16event.html
- %Application Data%\Microsoft\Beaver's_SMS_Bomber.exe_Url_4wbvbezvv4mjxpvtzn2wk5ilia2x33py\1.0.0.0\fs0laefl.tmp
- %Application Data%\Microsoft\Beaver's_SMS_Bomber.exe_Url_4wbvbezvv4mjxpvtzn2wk5ilia2x33py\1.0.0.0\fs0laefl.newcfg
- %Application Data%\Microsoft\Beaver's_SMS_Bomber.exe_Url_4wbvbezvv4mjxpvtzn2wk5ilia2x33py\1.0.0.0\vswhnd6d.tmp
- %Application Data%\Microsoft\Beaver's_SMS_Bomber.exe_Url_4wbvbezvv4mjxpvtzn2wk5ilia2x33py\1.0.0.0\vswhnd6d.newcfg
- %Application Data%\Microsoft\Beaver's_SMS_Bomber.exe_Url_4wbvbezvv4mjxpvtzn2wk5ilia2x33py\1.0.0.0\w-u5nsbm.tmp
- %Application Data%\Microsoft\Beaver's_SMS_Bomber.exe_Url_4wbvbezvv4mjxpvtzn2wk5ilia2x33py\1.0.0.0\w-u5nsbm.newcfg
- %Application Data%\Microsoft\Beaver's_SMS_Bomber.exe_Url_4wbvbezvv4mjxpvtzn2wk5ilia2x33py\1.0.0.0\bguklrof.tmp
- %Application Data%\Microsoft\Beaver's_SMS_Bomber.exe_Url_4wbvbezvv4mjxpvtzn2wk5ilia2x33py\1.0.0.0\bguklrof.newcfg
(Note: %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, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.. %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.)
This report is generated via an automated analysis system.
SOLUTION
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
Restore these modified registry values
Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.
- In HKEY_CURRENT_USER\Software\Microsoft\GDIPlus
- From: FontCachePath = "%Application Data%"
To: FontCachePath = ""%User Profile%\Local Settings\Application Data""
- From: FontCachePath = "%Application Data%"
Step 3
Search and delete these components
- %User Temp%\Beaver's SMS Bomber.exe
- %User Temp%\u16event.html
- %Application Data%\Microsoft\Beaver's_SMS_Bomber.exe_Url_4wbvbezvv4mjxpvtzn2wk5ilia2x33py\1.0.0.0\fs0laefl.tmp
- %Application Data%\Microsoft\Beaver's_SMS_Bomber.exe_Url_4wbvbezvv4mjxpvtzn2wk5ilia2x33py\1.0.0.0\fs0laefl.newcfg
- %Application Data%\Microsoft\Beaver's_SMS_Bomber.exe_Url_4wbvbezvv4mjxpvtzn2wk5ilia2x33py\1.0.0.0\vswhnd6d.tmp
- %Application Data%\Microsoft\Beaver's_SMS_Bomber.exe_Url_4wbvbezvv4mjxpvtzn2wk5ilia2x33py\1.0.0.0\vswhnd6d.newcfg
- %Application Data%\Microsoft\Beaver's_SMS_Bomber.exe_Url_4wbvbezvv4mjxpvtzn2wk5ilia2x33py\1.0.0.0\w-u5nsbm.tmp
- %Application Data%\Microsoft\Beaver's_SMS_Bomber.exe_Url_4wbvbezvv4mjxpvtzn2wk5ilia2x33py\1.0.0.0\w-u5nsbm.newcfg
- %Application Data%\Microsoft\Beaver's_SMS_Bomber.exe_Url_4wbvbezvv4mjxpvtzn2wk5ilia2x33py\1.0.0.0\bguklrof.tmp
- %Application Data%\Microsoft\Beaver's_SMS_Bomber.exe_Url_4wbvbezvv4mjxpvtzn2wk5ilia2x33py\1.0.0.0\bguklrof.newcfg
Step 4
Search and delete these folders
- %Application Data%\Microsoft\Beaver's_SMS_Bomber.exe_Url_4wbvbezvv4mjxpvtzn2wk5ilia2x33py
- %Application Data%\Microsoft\Beaver's_SMS_Bomber.exe_Url_4wbvbezvv4mjxpvtzn2wk5ilia2x33py\1.0.0.0
Step 5
Scan your computer with your Trend Micro product to delete files detected as TROJ_DROPPER.OPU. 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 6
Restore deleted/modified files and/or registry entries from backup
*Note: Only Microsoft-related files/keys/values will be restored. If this malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.
- %Application Data%\GDIPFONTCACHEV1.DAT
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