TROJ_DROP.BB
TrojanDropper:Win32/Silly_P2P.B (Microsoft); W32/Autorun.worm.dq.gen (McAfee); W32.SillyFDC (Symantec); PAK:PE-Crypt.CF, ARC:Embedded, [script.fly]:Worm.Win32.FlyStudio.bf, PAK:[krnln.fnr]:PE-Crypt.CF, PA (Kaspersky); Trojan.Win32.Autorun.dm (v) (Sunbelt); Trojan:W32/Regul.C (FSecure)
Windows 2000, Windows XP, Windows Server 2003
![](/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
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:
- %User Temp%\E_4
(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.)
Other System Modifications
This Trojan deletes the following files:
- %User Profile%\Cookies\index.dat
- %Temporary Internet Files%\Content.IE5\2TPM8950\desktop.ini
- %Temporary Internet Files%\Content.IE5\4H9MXTT9\desktop.ini
- %Temporary Internet Files%\Content.IE5\desktop.ini
- %Temporary Internet Files%\Content.IE5\index.dat
- %Temporary Internet Files%\Content.IE5\SMCZPN4M\desktop.ini
- %Temporary Internet Files%\Content.IE5\X9QQH2D9\desktop.ini
- %Temporary Internet Files%\desktop.ini
- %User Profile%\History.IE5\index.dat
- %User Profile%\MSHist012010121320101220\index.dat
- %User Profile%\MSHist012010122720110103\index.dat
- %User Profile%\MSHist012011010720110108\index.dat
(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)
It deletes the following folders:
- %User Profile%\History.IE5\MSHist012010121320101220
- %User Profile%\History.IE5\MSHist012010122720110103
- %User Profile%\History.IE5\MSHist012011010720110108
- %User Profile%\History\History.IE5
(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)
Dropping Routine
This Trojan drops the following files:
- %User Temp%\E_4\krnln.fnr
- %User Temp%\E_4\shell.fne
- %User Temp%\E_4\eAPI.fne
- %User Temp%\E_4\internet.fne
- %User Temp%\E_4\spec.fne
- %User Temp%\E_4\RegEx.fnr
- %User Temp%\E_4\dp1.fne
- %User Temp%\E_4\com.run
- %System%\XP-542ADE6B.EXE
- %System%\ul.dll
- %System%\og.dll
- %System%\og.EDT
- %User Startup%\¡¡¡¡¡¡.lnk
- %System%\com.run
- %System%\dp1.fne
- %System%\eAPI.fne
- %System%\internet.fne
- %System%\krnln.fnr
- %System%\RegEx.fnr
- %System%\shell.fne
- %System%\spec.fne
(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.. %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.. %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 Details
This Trojan connects to the following possibly malicious URL:
- http://www.{BLOCKED}u.com
- http://hi.{BLOCKED}u.com/siletoyou
- http://hi.{BLOCKED}u.com/ul.htm
This report is generated via an automated analysis system.
SOLUTION
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
Search and delete this folder
Step 3
Search and delete these files
- %User Temp%\E_4\krnln.fnr
- %User Temp%\E_4\shell.fne
- %User Temp%\E_4\eAPI.fne
- %User Temp%\E_4\internet.fne
- %User Temp%\E_4\spec.fne
- %User Temp%\E_4\RegEx.fnr
- %User Temp%\E_4\dp1.fne
- %User Temp%\E_4\com.run
- %System%\XP-542ADE6B.EXE
- %System%\ul.dll
- %System%\og.dll
- %System%\og.EDT
- %User Startup%\¡¡¡¡¡¡.lnk
- %System%\com.run
- %System%\dp1.fne
- %System%\eAPI.fne
- %System%\internet.fne
- %System%\krnln.fnr
- %System%\RegEx.fnr
- %System%\shell.fne
- %System%\spec.fne
Step 4
Scan your computer with your Trend Micro product to delete files detected as TROJ_DROP.BB. 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 5
Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.
- %User Profile%\Cookies\index.dat
- %Temporary Internet Files%\Content.IE5\2TPM8950\desktop.ini
- %Temporary Internet Files%\Content.IE5\4H9MXTT9\desktop.ini
- %Temporary Internet Files%\Content.IE5\desktop.ini
- %Temporary Internet Files%\Content.IE5\index.dat
- %Temporary Internet Files%\Content.IE5\SMCZPN4M\desktop.ini
- %Temporary Internet Files%\Content.IE5\X9QQH2D9\desktop.ini
- %Temporary Internet Files%\desktop.ini
- %User Profile%\History.IE5\index.dat
- %User Profile%\MSHist012010121320101220\index.dat
- %User Profile%\MSHist012010122720110103\index.dat
- %User Profile%\MSHist012011010720110108\index.dat
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