WORM_ROPIAN.A
Windows 2000, Windows XP, Windows Server 2003

Threat Type: Worm
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
This worm arrives as a component bundled with malware/grayware packages. It may be unknowingly downloaded by a user while visiting malicious websites.
It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.
TECHNICAL DETAILS
61448 bytes
DLL
19 Apr 2011
Arrival Details
This worm arrives as a component bundled with malware/grayware packages.
It may be unknowingly downloaded by a user while visiting malicious websites.
Installation
This worm drops the following copies of itself into the affected system:
- %UserTemp%\srv{random}.tmp
It drops the following non-malicious files:
- %UserTemp%\srv{random}.ini
Autostart Technique
This worm registers itself as a system service to ensure its automatic execution at every system startup by adding the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\srv{random}
ImagePath = %systemroot%\system32\svchost.exe -k netsvcs
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\srv{random}\parameters
servicedll = %UserTemp%\srv{random}.tmp
It modifies the following registry entries to ensure it automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\SvcHost
netsvcs = srv{random} {default value}
(Note: The default value data of the said registry entry is {default value}.)
Other System Modifications
This worm also creates the following registry entry(ies) as part of its installation routine:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Control\SafeBoot\Minimal\
srv{random}
Default = service
Propagation
This worm drops copies of itself in the following shared folders:
- setup{random numbers}.fon
It drops the following copy(ies) of itself in all removable drives:
- setup{random numbers}.fon
It 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:
{garbage}
[aUToRun]
aCtIOn=oPEn
{garbage}
icON=%WinDiR%\SYstem32\SheLl32.DLL,4
{garbage}
USeaUTOPLaY=1
{garbage}
oPEN=rUNDll32.exE SETuP{random numbers}.fon,{parameters}
{garbage}
sHELL\EXPlOre\cOMmaNd=RUNdLl32.ExE seTUp{random numbers}.Fon,{parameters}
{garbage}
SHELl\OPen\COMmAnD=ruNdlL32.exE SETup{random numbers}.FOn,{parameters}
{garbage}
Other Details
This worm does the following:
- Drops the following malicious shortcut files in all removable drives and shared folders:
- myporno.avi.lnk - LNK_OTORUN.SM
- pornmovs.lnk - LNK_OTORUN.SM
- {malwarename}.lnk - EXPL_CPLNK.SM
- Deletes the %system%\drivers\etc\hosts
SOLUTION
8.900
7.984.12
18 Apr 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_ROPIAN.A
Step 3
Identify and delete files detected as WORM_ROPIAN.A using either the Startup Disk or Recovery Console
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_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
- srv{random}
- srv{random}
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SafeBoot\Minimal
- srv{random}
- srv{random}
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\Windows NT\CurrentVersion\SvcHost
- From: netsvcs = srv{random} {default value}
To: {default value}
- From: netsvcs = srv{random} {default value}
Step 6
Search and delete these files
Step 7
Search and delete AUTORUN.INF files created by WORM_ROPIAN.A that contain these strings
Step 8
Scan your computer with your Trend Micro product to delete files detected as WORM_ROPIAN.A. 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. %System%\drivers\etc\hosts
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