TROJ_NOSECUR.AE
TrojanProxy:Win32/Banker.O, TrojanProxy:Win32/Banker.O (Microsoft); PWS-Banker!hdq (McAfee); PAK:UPX, ARC:BatToExe, [crash.bat]:Trojan.BAT.Agent.agp, [crash.bat]:Trojan.BAT.Agent.agp, [crash.ba (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt)
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.
It modifies files, disabling programs and applications from properly running.
TECHNICAL DETAILS
24,064 bytes
EXE
Yes
14 Jul 2012
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%\1.tmp
(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.)
Autostart Technique
This Trojan modifies the following registry entries to ensure it automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
Userinit = "%System%\userinit.exe,%User Temp%\ctfmon.exe,"
(Note: The default value data of the said registry entry is %Windows%\system32\userinit.exe,.)
Other System Modifications
This Trojan modifies the following files:
- %System%\WBEM\AutoRecover\88744D2A29102FC88ECF505DD2E984FC.mof
(Note: %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.)
It deletes the following files:
- %User Temp%\1.tmp
(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.)
It adds the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Wbem\WMIC
HKEY_CURRENT_USER\SOFTWARE\Microsoft\
Wbem\WMIC
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Control\Network\NetCfgLockHolder
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
system
EnableLUA = "0"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Internet Settings
DisableSR = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
WBEM\WMIC
mofcompstatus = "0"
HKEY_CURRENT_USER\Software\Microsoft\
Wbem\WMIC
WMICLC = "0"
HKEY_CURRENT_USER\Software\Microsoft\
Wbem\WMIC
mofcompMUIStatus = "0"
HKEY_CURRENT_USER\Software\Microsoft\
Wbem\WMIC
mofcompMUIStatus = "ffffffff"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
WBEM\WMIC
Cli.mof = "127360152460000000"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
WBEM\WMIC
CliEgAliases.mof = "127360152460000000"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
WBEM\WMIC
CliEgAliases.mfl = "127360152460000000"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
WBEM\WMIC
mofcompstatus = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Wbem\WMIC
WMICLC = "49"
It modifies the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
DirectDraw\MostRecentApplication
Name = "iexplore.exe"
(Note: The default value data of the said registry entry is iexplore.exe.)
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
DirectDraw\MostRecentApplication
ID = "4117b81"
(Note: The default value data of the said registry entry is 41107b81.)
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Security Center
AntiVirusDisableNotify = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Security Center
FirewallDisableNotify = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Security Center
UpdatesDisableNotify = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
WBEM\CIMOM
Autorecover MOFs timestamp = "129832750293125000"
(Note: The default value data of the said registry entry is 129689362348742500.)
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
WBEM\CIMOM
Autorecover MOFs = "{random characters}"
(Note: The default value data of the said registry entry is {random values}.)
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
WBEM\CIMOM
Autorecover MOFs timestamp = "129832750497187500"
(Note: The default value data of the said registry entry is 129689362348742500.)
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
WBEM\CIMOM
Autorecover MOFs timestamp = "129832750500781250"
(Note: The default value data of the said registry entry is 129689362348742500.)
Dropping Routine
This Trojan drops the following files:
- %User Temp%.\BRIAN-A09F4DDA9.txt
- %User Temp%\thunb.db
- %User Temp%\tmp2.tmp
- %User Temp%\tmp3.tmp
- %System%\WBEM\AutoRecover\C8463ECBE33BC240263A0B094E46D510.mof
- %User Temp%\tmp4.tmp
- %System%\WBEM\AutoRecover\23BDE61F1F4FACE17E9B0C01F2A1FD9B.mof
(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.)
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
Identify and delete files detected as TROJ_NOSECUR.AE using either the Startup Disk or Recovery Console
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\Wbem\
- WMIC
- In HKEY_CURRENT_USER\SOFTWARE\Microsoft\Wbem\
- WMIC
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Network
- NetCfgLockHolder
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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\system
- EnableLUA = "0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings
- DisableSR = "1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WBEM\WMIC
- mofcompstatus = "0"
- In HKEY_CURRENT_USER\Software\Microsoft\Wbem\WMIC
- WMICLC = "0"
- In HKEY_CURRENT_USER\Software\Microsoft\Wbem\WMIC
- mofcompMUIStatus = "0"
- In HKEY_CURRENT_USER\Software\Microsoft\Wbem\WMIC
- mofcompMUIStatus = "ffffffff"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WBEM\WMIC
- Cli.mof = "127360152460000000"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WBEM\WMIC
- CliEgAliases.mof = "127360152460000000"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WBEM\WMIC
- CliEgAliases.mfl = "127360152460000000"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WBEM\WMIC
- mofcompstatus = "1"
- In HKEY_CURRENT_USER\Software\Microsoft\Wbem\WMIC
- WMICLC = "49"
Step 5
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\SOFTWARE\Microsoft\DirectDraw\MostRecentApplication
- From: Name = "iexplore.exe"
To: Name = ""iexplore.exe""
- From: Name = "iexplore.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\DirectDraw\MostRecentApplication
- From: ID = "4117b81"
To: ID = ""41107b81""
- From: ID = "4117b81"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center
- AntiVirusDisableNotify = "1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center
- FirewallDisableNotify = "1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center
- UpdatesDisableNotify = "1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WBEM\CIMOM
- From: Autorecover MOFs timestamp = "129832750293125000"
To: Autorecover MOFs timestamp = ""129689362348742500""
- From: Autorecover MOFs timestamp = "129832750293125000"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WBEM\CIMOM
- From: Autorecover MOFs = "{random characters}"
To: Autorecover MOFs = ""{random values}""
- From: Autorecover MOFs = "{random characters}"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WBEM\CIMOM
- From: Autorecover MOFs timestamp = "129832750497187500"
To: Autorecover MOFs timestamp = ""129689362348742500""
- From: Autorecover MOFs timestamp = "129832750497187500"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WBEM\CIMOM
- From: Autorecover MOFs timestamp = "129832750500781250"
To: Autorecover MOFs timestamp = ""129689362348742500""
- From: Autorecover MOFs timestamp = "129832750500781250"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
- From: Userinit = "%System%\userinit.exe,%User Temp%\ctfmon.exe,"
To: Userinit = ""%Windows%\system32\userinit.exe,""
- From: Userinit = "%System%\userinit.exe,%User Temp%\ctfmon.exe,"
Step 6
Search and delete these files
- %User Temp%.\BRIAN-A09F4DDA9.txt
- %User Temp%\thunb.db
- %User Temp%\tmp2.tmp
- %User Temp%\tmp3.tmp
- %System%\WBEM\AutoRecover\C8463ECBE33BC240263A0B094E46D510.mof
- %User Temp%\tmp4.tmp
- %System%\WBEM\AutoRecover\23BDE61F1F4FACE17E9B0C01F2A1FD9B.mof
Step 7
Search and delete this folder
- %User Temp%\1.tmp
Step 8
Scan your computer with your Trend Micro product to delete files detected as TROJ_NOSECUR.AE. 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 9
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.
- %System%\WBEM\AutoRecover\88744D2A29102FC88ECF505DD2E984FC.mof
Step 10
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 Temp%\1.tmp
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