TROJ_DROPPER.ZX
TrojanDropper:Win32/Madri.A (Microsoft); [2.nsis\2.nsis]:MultiDropper-ST, [3.nsis]:Generic Dropper!um, [5.nsis\2.nsis]:Generic Dropper.lc, [5 (McAfee); Downloader (Symantec); ARC:NSIS, [small696.exe]:Trojan-Dropper.Win32.Agent.bcdn, [lqbzse.exe]:Trojan-Dropper.Win32.Agent.ba (Kaspersky); Trojan.Win32.Agent.a (fs), TrojanDropper.Win32.Madri.A (v), Trojan.Win32.Generic!BT, Trojan.Win32.Ge (Sunbelt); Trojan.Generic.909324 (FSecure)
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:
- %System Root%\DOCUME~1
- %System Root%\DOCUME~1\Wilbert
- %User Profile%\LOCALS~1
- D:\micsoft
- %User Temp%\Messenger
- %Windows%\messenger
- %System%\JSsetup
- %System%\jssetup
- %Windows%\fdsdf
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %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.. %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.. %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.)
Autostart Technique
This Trojan adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Messenger = "%Windows%\messenger\messenger.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
JSsetup = "%System%\jssetup\JSsetup.exe"
It 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,D:\micsoft\mysoft.exe"
(Note: The default value data of the said registry entry is %Windows%\system32\userinit.exe,.)
Other System Modifications
This Trojan deletes the following files:
- %User Temp%\nsi1.tmp
- %User Temp%\nsr3.tmp
- %User Temp%\359679~1.AQQ
(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\Softfy\
PlugName
HKEY_LOCAL_MACHINE\SOFTWARE\Softfy\
Plug
HKEY_LOCAL_MACHINE\SOFTWARE\Softfy\
PlugDown
HKEY_LOCAL_MACHINE\SOFTWARE\Softfy\
WebIni
HKEY_LOCAL_MACHINE\SOFTWARE\Softfy\
LockPage
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Softfy\
PlugName
LogonName = "fly3988.dll"
HKEY_LOCAL_MACHINE\SOFTWARE\Softfy\
PlugName
LogonMainName = "fly3988.dll"
HKEY_LOCAL_MACHINE\SOFTWARE\Softfy\
Plug
PlugUserName = "fullman"
HKEY_LOCAL_MACHINE\SOFTWARE\Softfy\
Plug
PlugSoftName = "C2"
HKEY_LOCAL_MACHINE\SOFTWARE\Softfy\
Plug
PlugSoftVer = "1.0.1"
HKEY_LOCAL_MACHINE\SOFTWARE\Softfy\
Plug
PlugSendNum = "0"
HKEY_LOCAL_MACHINE\SOFTWARE\Softfy\
Plug
PlugStat = "0"
HKEY_LOCAL_MACHINE\SOFTWARE\Softfy\
Plug
PlugUpdate = "1.9.0"
HKEY_LOCAL_MACHINE\SOFTWARE\Softfy\
Plug
CoreDll = "0"
HKEY_LOCAL_MACHINE\SOFTWARE\Softfy\
PlugDown
PlugOne = "1.0.0"
HKEY_LOCAL_MACHINE\SOFTWARE\Softfy\
PlugDown
PlugTwo = "1.0.0"
HKEY_LOCAL_MACHINE\SOFTWARE\Softfy\
WebIni
WebIniVer = "1.0.0"
HKEY_LOCAL_MACHINE\SOFTWARE\Softfy\
WebIni
WebIniSection = "4"
HKEY_LOCAL_MACHINE\SOFTWARE\Softfy\
WebIni
HitProbaby = "0"
HKEY_LOCAL_MACHINE\SOFTWARE\Softfy\
LockPage
LockPageNum = "0"
HKEY_LOCAL_MACHINE\SOFTWARE\Softfy\
LockPage
NeedLockPage = "0"
HKEY_LOCAL_MACHINE\SOFTWARE\Softfy\
Plug
PlugSendNum = "1"
It modifies the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Control\Session Manager\Environment
Path = "D:\micsoft;%SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem"
(Note: The default value data of the said registry entry is {random values}.)
Dropping Routine
This Trojan drops the following files:
- %User Temp%\nsi2.tmp
- %User Temp%\small696.exe
- %User Temp%\lqbzse.exe
- %User Temp%\svehost.exe
- %User Temp%\llly9.exe
- %User Temp%\selvice.exe
- %User Temp%\syseter.exe
- %User Temp%\Color.exe
- %System%\fly3988.dll
- %System%\dllcache\fly3988.dll
- %System%\mysoft.exe
- afc9fe2f418b00a0.bat
- %Windows%\msapps\hvo7094.nfo
- %User Temp%\4.tmp
- %User Temp%\Messenger\cc.exe
- %User Temp%\Messenger\iexplore.exe
- %User Temp%\Messenger\nvmctray.dll
- %User Temp%\Messenger\nvsys.ini
- %User Temp%\Messenger\setup.exe
- %User Temp%\Messenger\sysmain.dat
- %User Temp%\Messenger\sysvc.dat
- %System%\acbkuu.bat
- %Windows%\messenger\messenger.exe
- %Windows%\security\Messenger.ini
- %System%\dllcache\ipfltdrv.sys.sys
- %System%\drivers\ipfltdrv.sys.txt
- %System%\drivers\osrvwr.log
(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.. %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)
Other Details
This Trojan connects to the following possibly malicious URL:
- http://{BLOCKED}.176.194/sports/image.jpg
- http://www.{BLOCKED}c.net.cn/sports/image.jpg
- http://{BLOCKED}.176.194/nba/image.jpg
- http://{BLOCKED}.176.194/files/image.jpg
- http://www.{BLOCKED}c.net.cn/files/image.jpg
- http://{BLOCKED}.176.194/news/image.jpg
- http://88888888.{BLOCKED}6.org/ExeIni14/Messenger.txt
- http://www.{BLOCKED}nji.cn/ExeIni14/Messenger.txt
- http://888888.{BLOCKED}8.org/Monitor_INI14/Messenger.txt
- http://www.{BLOCKED}qface.com//lin//lin.asp
- http://www.{BLOCKED}n.cn/page/gt.asp?{random characters}
- http://www.{BLOCKED}qface.comhttp://www.baidupn.cn/page/gt.asp?{random characters}
- http://msg.{BLOCKED}5.com/html/downloader_4005.gif
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
Identify and delete files detected as TROJ_DROPPER.ZX 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\Softfy
- PlugName
- In HKEY_LOCAL_MACHINE\SOFTWARE\Softfy
- Plug
- In HKEY_LOCAL_MACHINE\SOFTWARE\Softfy
- PlugDown
- In HKEY_LOCAL_MACHINE\SOFTWARE\Softfy
- WebIni
- In HKEY_LOCAL_MACHINE\SOFTWARE\Softfy
- LockPage
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
- Messenger = "%Windows%\messenger\messenger.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- JSsetup = "%System%\jssetup\JSsetup.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Softfy\PlugName
- LogonName = "fly3988.dll"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Softfy\PlugName
- LogonMainName = "fly3988.dll"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Softfy\Plug
- PlugUserName = "fullman"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Softfy\Plug
- PlugSoftName = "C2"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Softfy\Plug
- PlugSoftVer = "1.0.1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Softfy\Plug
- PlugSendNum = "0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Softfy\Plug
- PlugStat = "0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Softfy\Plug
- PlugUpdate = "1.9.0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Softfy\Plug
- CoreDll = "0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Softfy\PlugDown
- PlugOne = "1.0.0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Softfy\PlugDown
- PlugTwo = "1.0.0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Softfy\WebIni
- WebIniVer = "1.0.0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Softfy\WebIni
- WebIniSection = "4"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Softfy\WebIni
- HitProbaby = "0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Softfy\LockPage
- LockPageNum = "0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Softfy\LockPage
- NeedLockPage = "0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Softfy\Plug
- PlugSendNum = "1"
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\SYSTEM\ControlSet001\Control\Session Manager\Environment
- From: Path = "D:\micsoft;%SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem"
To: Path = ""{random values}""
- From: Path = "D:\micsoft;%SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
- From: Userinit = "%System%\userinit.exe,D:\micsoft\mysoft.exe"
To: Userinit = ""%Windows%\system32\userinit.exe,""
- From: Userinit = "%System%\userinit.exe,D:\micsoft\mysoft.exe"
Step 6
Search and delete these files
- %User Temp%\nsi2.tmp
- %User Temp%\small696.exe
- %User Temp%\lqbzse.exe
- %User Temp%\svehost.exe
- %User Temp%\llly9.exe
- %User Temp%\selvice.exe
- %User Temp%\syseter.exe
- %User Temp%\Color.exe
- %System%\fly3988.dll
- %System%\dllcache\fly3988.dll
- %System%\mysoft.exe
- afc9fe2f418b00a0.bat
- %Windows%\msapps\hvo7094.nfo
- %User Temp%\4.tmp
- %User Temp%\Messenger\cc.exe
- %User Temp%\Messenger\iexplore.exe
- %User Temp%\Messenger\nvmctray.dll
- %User Temp%\Messenger\nvsys.ini
- %User Temp%\Messenger\setup.exe
- %User Temp%\Messenger\sysmain.dat
- %User Temp%\Messenger\sysvc.dat
- %System%\acbkuu.bat
- %Windows%\messenger\messenger.exe
- %Windows%\security\Messenger.ini
- %System%\dllcache\ipfltdrv.sys.sys
- %System%\drivers\ipfltdrv.sys.txt
- %System%\drivers\osrvwr.log
Step 7
Search and delete these folders
- %System Root%\DOCUME~1
- %System Root%\DOCUME~1\Wilbert
- %User Profile%\LOCALS~1
- D:\micsoft
- %User Temp%\Messenger
- %Windows%\messenger
- %System%\JSsetup
- %System%\jssetup
- %Windows%\fdsdf
Step 8
Scan your computer with your Trend Micro product to delete files detected as TROJ_DROPPER.ZX. 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 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%\nsi1.tmp
- %User Temp%\nsr3.tmp
- %User Temp%\359679~1.AQQ
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