TROJ_ROPEST.YZE
Windows
![](/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.
It disables Task Manager, Registry Editor, and Folder Options.
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 Profile%\Windows\dllcache
- %User Profile%\dllcache\drivers
(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)
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
systeminfo = "%User Profile%\dllcache\systeminfo.exe "
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\RunOnce
systeminfo = "%User Profile%\dllcache\systeminfo.exe "
Other System Modifications
This Trojan deletes the following files:
- %User Profile%\dllcache\systeminfo.exe:Zone.Identifier
(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)
It adds the following registry keys:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Windows
HKEY_USERS\S-1-5-21-1645522239-1292428093-682003330-1003\Software\
Microsoft\Windows\CurrentVersion\
RunOnce
HKEY_USERS\.DEFAULT\Software\
Microsoft\Windows\CurrentVersion\
RunOnce
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Control\MediaResources\msvideo
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Windows
UniqueUserHash = "{random values}"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Windows
UserPolicies = "{random values}"
HKEY_CURRENT_USER\Software\Microsoft\
Command Processor
AutoRun = "%User Profile%\dllcache\systeminfo.exe "
It modifies the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
ShowCompColor = "0"
(Note: The default value data of the said registry entry is 1.)
HKEY_CURRENT_USER\Control Panel\Desktop
SCRNSAVE.EXE = "%User Profile%\dllcache\systeminfo.exe "
(Note: The default value data of the said registry entry is %Windows%\system32\logon.scr.)
It creates the following registry entry(ies) to disable Task Manager, Registry Tools and Folder Options:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer
Run = "%User Profile%\dllcache\systeminfo.exe "
Dropping Routine
This Trojan drops the following files:
- %User Profile%\dllcache\systeminfo.exe
- %User Temp%\tmp4.tmp
- %User Temp%\tmpD.tmp
- %User Startup%\systeminfo.lnk
- %User Profile%\dllcache\ntvdm.exe
- %User Profile%\dllcache\rasctrnm.h
- %User Profile%\dllcache\daxctle.ocx
- %User Profile%\dllcache\icaapi.dll
- %User Profile%\dllcache\batt.dll
- %User Profile%\dllcache\browseui.dll
- %User Profile%\dllcache\activeds.tlb
- %User Profile%\dllcache\ieakeng.dll
- %User Profile%\dllcache\alg.exe
- %User Profile%\dllcache\watchdog.sys
- %User Profile%\dllcache\append.exe
- %User Profile%\dllcache\fastopen.exe
- %User Profile%\dllcache\kanji_1.uce
- %User Profile%\dllcache\gpkcsp.dll
- %User Profile%\dllcache\mlang.dat
- %User Profile%\dllcache\racpldlg.dll
- %User Profile%\dllcache\d3dpmesh.dll
- %User Profile%\dllcache\safrcdlg.dll
- %User Profile%\dllcache\verifier.exe
- %User Profile%\dllcache\xcopy.exe
- %User Profile%\dllcache\nscompat.tlb
- %User Profile%\dllcache\homepage.inf
- %User Profile%\dllcache\edit.hlp
- %User Profile%\dllcache\oembios.bin
- %User Profile%\dllcache\taskkill.exe
- %User Profile%\dllcache\kbdfc.dll
- %User Profile%\dllcache\rdchost.dll
- %User Profile%\dllcache\iaspolcy.dll
- %User Profile%\dllcache\perfnw.dll
- %User Profile%\dllcache\tapi.dll
- %User Profile%\dllcache\kb16.com
- %User Profile%\dllcache\mag_hook.dll
- %User Profile%\dllcache\plugin.ocx
- %User Profile%\dllcache\calc.exe
- %User Profile%\dllcache\iasrad.dll
- %User Profile%\dllcache\certcli.dll
- %User Profile%\dllcache\acelpdec.ax
- %User Profile%\dllcache\emptyregdb.dat
- %User Profile%\dllcache\kbdbu.dll
- %User Profile%\dllcache\atmpvcno.dll
- %User Profile%\dllcache\adsnw.dll
- %User Profile%\dllcache\locator.exe
- %User Profile%\dllcache\tapiperf.dll
- %User Profile%\dllcache\tapisrv.dll
- %User Profile%\dllcache\fwcfg.dll
- %User Profile%\dllcache\loadperf.dll
- %User Profile%\dllcache\fdeploy.dll
- %User Profile%\dllcache\langwrbk.dll
- %User Profile%\dllcache\dataclen.dll
- %User Profile%\dllcache\himem.sys
- %User Profile%\dllcache\efsadu.dll
- %User Profile%\dllcache\dmband.dll
- %User Profile%\dllcache\View Channels.scf
- %User Profile%\dllcache\blastcln.exe
- %User Profile%\dllcache\rsvpperf.dll
- %User Profile%\dllcache\fc.exe
- %User Profile%\dllcache\rcimlby.exe
- %User Profile%\dllcache\webcheck.dll
- %User Profile%\dllcache\rasautou.exe
- %User Profile%\dllcache\mrinfo.exe
- %User Profile%\dllcache\userenv.dll
- %User Profile%\dllcache\kbduk.dll
- %User Profile%\dllcache\wiaservc.dll
- %User Profile%\dllcache\jscript.dll
- %User Profile%\dllcache\wiaacmgr.exe
- %User Profile%\dllcache\mdminst.dll
- %User Profile%\dllcache\qappsrv.exe
- %User Profile%\dllcache\ega.cpi
- %User Profile%\dllcache\UIAutomationCore.dll
- %User Profile%\dllcache\oakley.dll
- %User Profile%\dllcache\scriptpw.dll
- %User Profile%\dllcache\rasman.dll
- %User Profile%\dllcache\icwphbk.dll
- %User Profile%\dllcache\fixmapi.exe
- %User Profile%\dllcache\wbcache.deu
- %User Profile%\dllcache\actxprxy.dll
- %User Profile%\dllcache\t2embed.dll
- %User Profile%\dllcache\hnetmon.dll
- %User Profile%\dllcache\drprov.dll
- %User Profile%\dllcache\laprxy.dll
- %User Profile%\dllcache\dbnetlib.dll
- %User Profile%\dllcache\faultrep.dll
- %User Profile%\dllcache\scrobj.dll
- %User Profile%\dllcache\sc.exe
- %User Profile%\dllcache\sbeio.dll
- %User Profile%\dllcache\qedwipes.dll
- %User Profile%\dllcache\browselc.dll
- %User Profile%\dllcache\vbisurf.ax
- %User Profile%\dllcache\wbcache.fra
- %User Profile%\dllcache\unimdm.tsp
- %User Profile%\dllcache\wdmaud.drv
- %User Profile%\dllcache\aaaamon.dll
- %User Profile%\dllcache\xactsrv.dll
- %User Profile%\dllcache\cacls.exe
- %User Profile%\dllcache\basesrv.dll
- %User Profile%\dllcache\odbc16gt.dll
- %User Profile%\dllcache\kbdes.dll
- %User Profile%\dllcache\iasnap.dll
- %User Profile%\dllcache\camocx.dll
- %User Profile%\dllcache\bootvrfy.exe
- %User Profile%\dllcache\lnkstub.exe
- %User Profile%\dllcache\netcfgx.dll
- %User Profile%\dllcache\routetab.dll
- %User Profile%\dllcache\iassdo.dll
- %User Profile%\dllcache\capesnpn.dll
- %User Profile%\dllcache\webvw.dll
- %User Profile%\dllcache\vdmredir.dll
- %User Profile%\dllcache\sigverif.exe
- %User Profile%\dllcache\noise.chs
- %User Profile%\dllcache\usrcntra.dll
- %User Profile%\dllcache\adsldp.dll
- %User Profile%\dllcache\d3d8.dll
- %User Profile%\dllcache\vjoy.dll
- %User Profile%\dllcache\hid.dll
- %User Profile%\dllcache\acledit.dll
- %User Profile%\dllcache\find.exe
- %User Profile%\dllcache\access.cpl
- %User Profile%\dllcache\hlink.dll
- %User Profile%\dllcache\regsvc.dll
- %User Profile%\dllcache\jobexec.dll
- %User Profile%\dllcache\narrator.exe
- %User Profile%\dllcache\w32tm.exe
- %User Profile%\dllcache\blackbox.dll
- %User Profile%\dllcache\proquota.exe
- %User Profile%\dllcache\esentprf.hxx
- %User Profile%\dllcache\xpob2res.dll
- %User Profile%\dllcache\edlin.exe
- %User Profile%\dllcache\kbdca.dll
- %User Profile%\dllcache\datime.dll
- %User Profile%\dllcache\rasauto.dll
Other Details
This Trojan connects to the following possibly malicious URL:
- {BLOCKED}33.197
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
Restart in Safe Mode
Step 3
Enable Registry Editor, Task Manager, and Folder options
Step 4
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_CURRENT_USER\Software\Microsoft\CurrentVersion
- Windows
- In HKEY_USERS\S-1-5-21-1645522239-1292428093-682003330-1003\Software\Microsoft\Windows\CurrentVersion
- RunOnce
- In HKEY_USERS\.DEFAULT\Software\Microsoft\Windows\CurrentVersion
- RunOnce
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\MediaResources
- msvideo
Step 5
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
- systeminfo = "%User Profile%\dllcache\systeminfo.exe "
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnce
- systeminfo = "%User Profile%\dllcache\systeminfo.exe "
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Windows
- UniqueUserHash = "{random values}"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Windows
- UserPolicies = "{random values}"
- In HKEY_CURRENT_USER\Software\Microsoft\Command Processor
- AutoRun = "%User Profile%\dllcache\systeminfo.exe "
Step 6
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\Windows\CurrentVersion\Explorer\Advanced
- From: ShowCompColor = "0"
To: ShowCompColor = ""1""
- From: ShowCompColor = "0"
- In HKEY_CURRENT_USER\Control Panel\Desktop
- From: SCRNSAVE.EXE = "%User Profile%\dllcache\systeminfo.exe "
To: SCRNSAVE.EXE = ""%Windows%\system32\logon.scr""
- From: SCRNSAVE.EXE = "%User Profile%\dllcache\systeminfo.exe "
Step 7
Search and delete these components
- %User Profile%\dllcache\systeminfo.exe
- %User Temp%\tmp4.tmp
- %User Temp%\tmpD.tmp
- %User Startup%\systeminfo.lnk
- %User Profile%\dllcache\ntvdm.exe
- %User Profile%\dllcache\rasctrnm.h
- %User Profile%\dllcache\daxctle.ocx
- %User Profile%\dllcache\icaapi.dll
- %User Profile%\dllcache\batt.dll
- %User Profile%\dllcache\browseui.dll
- %User Profile%\dllcache\activeds.tlb
- %User Profile%\dllcache\ieakeng.dll
- %User Profile%\dllcache\alg.exe
- %User Profile%\dllcache\watchdog.sys
- %User Profile%\dllcache\append.exe
- %User Profile%\dllcache\fastopen.exe
- %User Profile%\dllcache\kanji_1.uce
- %User Profile%\dllcache\gpkcsp.dll
- %User Profile%\dllcache\mlang.dat
- %User Profile%\dllcache\racpldlg.dll
- %User Profile%\dllcache\d3dpmesh.dll
- %User Profile%\dllcache\safrcdlg.dll
- %User Profile%\dllcache\verifier.exe
- %User Profile%\dllcache\xcopy.exe
- %User Profile%\dllcache\nscompat.tlb
- %User Profile%\dllcache\homepage.inf
- %User Profile%\dllcache\edit.hlp
- %User Profile%\dllcache\oembios.bin
- %User Profile%\dllcache\taskkill.exe
- %User Profile%\dllcache\kbdfc.dll
- %User Profile%\dllcache\rdchost.dll
- %User Profile%\dllcache\iaspolcy.dll
- %User Profile%\dllcache\perfnw.dll
- %User Profile%\dllcache\tapi.dll
- %User Profile%\dllcache\kb16.com
- %User Profile%\dllcache\mag_hook.dll
- %User Profile%\dllcache\plugin.ocx
- %User Profile%\dllcache\calc.exe
- %User Profile%\dllcache\iasrad.dll
- %User Profile%\dllcache\certcli.dll
- %User Profile%\dllcache\acelpdec.ax
- %User Profile%\dllcache\emptyregdb.dat
- %User Profile%\dllcache\kbdbu.dll
- %User Profile%\dllcache\atmpvcno.dll
- %User Profile%\dllcache\adsnw.dll
- %User Profile%\dllcache\locator.exe
- %User Profile%\dllcache\tapiperf.dll
- %User Profile%\dllcache\tapisrv.dll
- %User Profile%\dllcache\fwcfg.dll
- %User Profile%\dllcache\loadperf.dll
- %User Profile%\dllcache\fdeploy.dll
- %User Profile%\dllcache\langwrbk.dll
- %User Profile%\dllcache\dataclen.dll
- %User Profile%\dllcache\himem.sys
- %User Profile%\dllcache\efsadu.dll
- %User Profile%\dllcache\dmband.dll
- %User Profile%\dllcache\View Channels.scf
- %User Profile%\dllcache\blastcln.exe
- %User Profile%\dllcache\rsvpperf.dll
- %User Profile%\dllcache\fc.exe
- %User Profile%\dllcache\rcimlby.exe
- %User Profile%\dllcache\webcheck.dll
- %User Profile%\dllcache\rasautou.exe
- %User Profile%\dllcache\mrinfo.exe
- %User Profile%\dllcache\userenv.dll
- %User Profile%\dllcache\kbduk.dll
- %User Profile%\dllcache\wiaservc.dll
- %User Profile%\dllcache\jscript.dll
- %User Profile%\dllcache\wiaacmgr.exe
- %User Profile%\dllcache\mdminst.dll
- %User Profile%\dllcache\qappsrv.exe
- %User Profile%\dllcache\ega.cpi
- %User Profile%\dllcache\UIAutomationCore.dll
- %User Profile%\dllcache\oakley.dll
- %User Profile%\dllcache\scriptpw.dll
- %User Profile%\dllcache\rasman.dll
- %User Profile%\dllcache\icwphbk.dll
- %User Profile%\dllcache\fixmapi.exe
- %User Profile%\dllcache\wbcache.deu
- %User Profile%\dllcache\actxprxy.dll
- %User Profile%\dllcache\t2embed.dll
- %User Profile%\dllcache\hnetmon.dll
- %User Profile%\dllcache\drprov.dll
- %User Profile%\dllcache\laprxy.dll
- %User Profile%\dllcache\dbnetlib.dll
- %User Profile%\dllcache\faultrep.dll
- %User Profile%\dllcache\scrobj.dll
- %User Profile%\dllcache\sc.exe
- %User Profile%\dllcache\sbeio.dll
- %User Profile%\dllcache\qedwipes.dll
- %User Profile%\dllcache\browselc.dll
- %User Profile%\dllcache\vbisurf.ax
- %User Profile%\dllcache\wbcache.fra
- %User Profile%\dllcache\unimdm.tsp
- %User Profile%\dllcache\wdmaud.drv
- %User Profile%\dllcache\aaaamon.dll
- %User Profile%\dllcache\xactsrv.dll
- %User Profile%\dllcache\cacls.exe
- %User Profile%\dllcache\basesrv.dll
- %User Profile%\dllcache\odbc16gt.dll
- %User Profile%\dllcache\kbdes.dll
- %User Profile%\dllcache\iasnap.dll
- %User Profile%\dllcache\camocx.dll
- %User Profile%\dllcache\bootvrfy.exe
- %User Profile%\dllcache\lnkstub.exe
- %User Profile%\dllcache\netcfgx.dll
- %User Profile%\dllcache\routetab.dll
- %User Profile%\dllcache\iassdo.dll
- %User Profile%\dllcache\capesnpn.dll
- %User Profile%\dllcache\webvw.dll
- %User Profile%\dllcache\vdmredir.dll
- %User Profile%\dllcache\sigverif.exe
- %User Profile%\dllcache\noise.chs
- %User Profile%\dllcache\usrcntra.dll
- %User Profile%\dllcache\adsldp.dll
- %User Profile%\dllcache\d3d8.dll
- %User Profile%\dllcache\vjoy.dll
- %User Profile%\dllcache\hid.dll
- %User Profile%\dllcache\acledit.dll
- %User Profile%\dllcache\find.exe
- %User Profile%\dllcache\access.cpl
- %User Profile%\dllcache\hlink.dll
- %User Profile%\dllcache\regsvc.dll
- %User Profile%\dllcache\jobexec.dll
- %User Profile%\dllcache\narrator.exe
- %User Profile%\dllcache\w32tm.exe
- %User Profile%\dllcache\blackbox.dll
- %User Profile%\dllcache\proquota.exe
- %User Profile%\dllcache\esentprf.hxx
- %User Profile%\dllcache\xpob2res.dll
- %User Profile%\dllcache\edlin.exe
- %User Profile%\dllcache\kbdca.dll
- %User Profile%\dllcache\datime.dll
- %User Profile%\dllcache\rasauto.dll
Step 8
Search and delete these folders
- %User Profile%\Windows\dllcache
- %User Profile%\dllcache\drivers
Step 9
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_ROPEST.YZE. 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 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 Profile%\dllcache\systeminfo.exe:Zone.Identifier
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