WORM_PHORPIEX.CII
Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Worm
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This worm arrives via removable drives. It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
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
142,336 bytes
EXE
05 Dec 2013
Arrival Details
This worm arrives via removable drives.
It 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 worm adds the following folders:
- %Application Data%\Microsoft-Driver-1-25-8784-4125-7572
- {Removable Drive}:\{random numbers}
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.)
It drops the following copies of itself into the affected system and executes them:
- %Application Data%\Microsoft-Driver-1-25-8784-4125-7572\winsvc.exe
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.)
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
Microsoft® NSVTCR Driver = "%Application Data%\Microsoft-Driver-1-25-8784-4125-7572\winsvc.exe"
Other System Modifications
This worm creates the following registry entry(ies) to bypass Windows Firewall:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
%Application Data%\Microsoft-Driver-1-25-8784-4125-7572\winsvc.exe = "%Application Data%\Microsoft-Driver-1-25-8784-4125-7572\winsvc.exe:*:Enabled:Microsoft® NSVTCR Driver"
Propagation
This worm drops the following copy(ies) of itself in all removable drives:
- {Removable Drive}:\wincdrs32.exe
- {Removable Drive}:\{random numbers}\{Folder Names}.exe
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:
[autorun]
icon=%SystemRoot%\system32\SHELL32.dll,4
action=Open folder to view files
shellexecute=wincdrs32.exe
UseAutoPlay=1
NOTES:
This worm creates .LNK (shortcut) files pointing to the copy of WORM_PHORPIEX.CII named {Removable Drive}:\{random numbers}\{Folder Names}.exe.
{Folder Names} are the folder names found at the root of the removable drive, if there are any.
It then sets the attribute of the said folders to Hidden.