WORM_OTORUN.WKJ
[Kaspersky] Worm.Win32.AutoRun.hug; [McAfee] W32/Autorun.worm.zzk; [Microsoft] Worm:Win32/Hilgild!gen.A; [Symantec] W32.SillyFDC
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Worm
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
This worm arrives via removable drives.
It modifies certain registry entries to hide file extensions.
It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.
It executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.
TECHNICAL DETAILS
266,240 bytes
EXE
No
30 Jul 2011
Arrival Details
This worm arrives via removable drives.
It may arrive via network shares.
Installation
This worm drops the following copies of itself into the affected system:
- %system root%\Documents and Settings\All Users\Application Data\wmimgmt.exe
It drops the following non-malicious files:
- %system root%\Documents and Settings\All Users\DRM\Media\8E60A049.db
- %system root%\Documents and Settings\All Users\DRM\Media\line.dat
- %User Temp%\RHFLQB.XML
- %User Temp%\tmp~ghi.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.)
It adds the following possibly malicious files or file components:
- %system%\wuausrv.dll - detected by Trend Micro as BKDR_PROTUX.PI
It creates the following folders:
- %system root%\Documents and Settings\All Users\DRM\Media
It adds the following mutexes to ensure that only one of its copies runs at any one time:
- ProgramLQBMutex
Autostart Technique
This worm adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
wmi32 = "%system root%\Documents and Settings\All Users\Application Data\wmimgmt.exe"
Other System Modifications
This worm modifies the following registry entries to hide files with Hidden attributes:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
ShowSuperHidden = 0
(Note: The default value data of the said registry entry is 1.)
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced\Folder\SuperHidden
UncheckedValue = 0
(Note: The default value data of the said registry entry is 1.)
It modifies the following registry entries to hide file extensions:
HKEY_CLASSES_ROOT\exefile
NeverShowExt = ""
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
exefile
NeverShowExt = ""
Propagation
This worm drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.
The said .INF file contains the following strings:
; for 16-bit app support
[extensions]
[fonts]
[mci extensions]
[Mail]
[files]
MAPI=1
MAPIX=1
MAPIXVER=1.0.0.1
OLEMessaging=1
CMCDLLNAME32=mapi32.dll
CMC=1
[MCI Extensions]
aif=loghours.dll
aiff=ole2.dll
asf=d3dramp.dll
aifc=psnppagn.dll
asx=MPEGVideo2
mpe=usrdtea.dll
mpg=MPEGVideo
mpv2=idq.dll
mpeg=MPEGVideo
snd=atl.dll
wm=mcd32.dll
wma=MP4
wmp=MP3
wmv=MPEG
wmx=MPEGVideo32
251846kfi56s
;{garbage}
[Kasasf0q]iLasdfjKD28Ls33wDm2rq6Jl1EdAf8
;{garbage}
[shellas]dBop1comasdnhsdf=fdsjsdf.exenghsadnetstad.
as=asdfash0fsad asd1safsd9safdasf
;{garbage}
oaeFK1Kajkw6DdDL2f3a31zazi8a135Lwra
Ls33wDm2rq6Jl1EdAf8soae FK1Kajkw6DdDLKAl6sdcO7K
asdfsadfLsafdsfadsdm FKajkw6KAl6sdcO7K
;{garbage}
[autorun]K0qi3adCa19lhsdfjKD2asfd23asdfsdfa
PRINT=PRINT.EXE ASDd98daf897asdj
;{garbage}
Play= Copy pictures to a foler on my computer
shEllEXEcuTe = RECYCLER\wmimgmt.com
;{garbage}
sheLL\oPeN\coMManD =RECYCLER\wmimgmt.com
;{garbage}
shELl\ExpLore\ComMand= RECYCLER\wmimgmt.com
s=asfdsa5dffafdAf8soaeFExpLoreqiLasJ8Z3adC
;{garbage}
Action=Open folder to view files
;{garbage}
Spell=Take no action then print the picture
[drivers]
wave=mmdrv.dll
[driver32]
timer=timer.drv
[mci]
woafont=app936.FON
EGA40WOA.FON=EGA40WOA.FON
[386enh]
EGA51WOA.FON=KBDDSP.FON
Dropping Routine
This worm executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.
NOTES:
The dropped AUTORUN.INF is detected by Trend Micro as Mal_Otorun1.
This worm creates the following folder in all shared folders and removable drives:
- RECYCLER
It drops the following copy of itself in all shared folders and removable drives:
- RECYCLER\wmimgmt.com
It also drops the following non-malicious files in all shared folders and removable drives:
- RECYCLER\8E60A049.db
- RECYCLER\desktop.ini
It searches for folders in all shared folders and removable drives then drops copies of itself as {folder name}.EXE.
It sets the attributes of all the found folders in the shared folders and removable drives to Hidden.
SOLUTION
8.900
8.318.13
30 Jul 2011
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
Remove malware files dropped/downloaded by WORM_OTORUN.WKJ
- BKDR_PROTUX.PI
Step 3
Restart in Safe Mode
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
- wmi32 = "%system root%\Documents and Settings\All Users\Application Data\wmimgmt.exe"
- wmi32 = "%system root%\Documents and Settings\All Users\Application Data\wmimgmt.exe"
- In HKEY_CLASSES_ROOT\exefile
- NeverShowExt = ""
- NeverShowExt = ""
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\exefile
- NeverShowExt = ""
- NeverShowExt = ""
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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
- From: ShowSuperHidden = 0
To: ShowSuperHidden = 1
- From: ShowSuperHidden = 0
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Folder\SuperHidden
- From: UncheckedValue = 0
To: UncheckedValue = 1
- From: UncheckedValue = 0
Step 6
Search and delete these folders
Step 7
Search and delete this file
Step 8
Search and delete AUTORUN.INF files created by WORM_OTORUN.WKJ that contain these strings
Step 9
Scan your computer with your Trend Micro product to delete files detected as WORM_OTORUN.WKJ. 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.
NOTES:
Changing File attributes using ATTRIB command
- Open a command prompt.
- For Windows 2000, Windows XP, and Windows Server 2003 users, click Start>Run. In the Open input box, type CMD then press Enter.
- For Windows Vista and Windows 7 users, click Start, type CMD in the Search input field then press Enter.
- In the CMD console, type the following:
ATTRIB [+R | -R] [+A | -A ] [+S | -S] [+H | -H] [+I | -I] [drive:][path][filename] [/S [/D] [/L]]Where:
+ Sets an attribute.
- Clears an attribute.
R Read-only file attribute.
A Archive file attribute.
S System file attribute.
H Hidden file attribute.
I Not content indexed file attribute.
[drive:][path][filename] Specifies a file or files for attrib to process.
/S Processes matching files in the current folder and all subfolders.
/D Processes folders as well.
/L Work on the attributes of the Symbolic Link versus the target of the Symbolic Link - Repeat Step 2 for folders and files in other drives or directories.
Example:
ATTRIB –H D:\* /S /D
[Remove Hidden Attribute for all files and folders including subfolders in drive D]
This malware is detected and removed by the latest Trend Micro anti-malware engine and pattern. Always keep pattern files and engines up-to-date.
To know more about updating your Trend Micro product’s pattern, please refer to the Trend Micro Support page How do I manually update the virust pattern of my Trend Micro Internet.
Note: The steps apply for specific products indicated in the page.
To actively detect and protect your machine, enable real-time scanning of your Trend Micro anti-malware product. Refer to the following Trend Micro support page to know more about enabling real-time scanning in your Trend Micro product:
- When a computer is compromised, isolate it immediately from the network.
- Turn off file sharing if not needed. If needed, disable anonymous access to shared folders.
- Disable AutoPlay to avoid automatic execution of executable files in removable drives.
- Configure your system to show hidden files and folders and display file extensions.
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