WORM_PALEVO.ASB

This worm may arrive via MSN Messenger.

It does not continue with its routine if the if the malware file name is C:\file.exe or C:\sample.exe or if the user name is CurrentUser.

It is capable of propagating via MSN Messenger by sending messages containing a link where a copy of itself may be downloaded.

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 copies of itself in all removable drives. It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.

It opens random ports. It executes commands from a remote malicious user, effectively compromising the affected system. It connects to a website to send and receive information.

However, as of this writing, the said sites are inaccessible.

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 drops the following copies of itself into the affected system:

• %User Profile%\Application Data\{random filename}.exe

(Note: %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.)

It injects itself into the following processes as part of its memory residency routine:

• explorer.exe

Autostart Technique

This worm adds the following registry entries to enable its automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
Taskman = "%User Profile%\Application Data\{random filename}.exe"

Propagation

This worm drops copies of itself in all removable drives.

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 characters}
[autorun
{garbage characters}
open=sond/Mircr0dll.exe
{garbage characters}
:call
{garbage characters}
icon=%SystemRoot%\system32\SHELL32.dll,4
{garbage characters}
:cmp
{garbage characters}
action=Open folder to view files using Windows Explorer
{garbage characters}
shell\\open\\command=sond/Mircr0dll.exe
{garbage characters}
:jmp5
{garbage characters}
shell\\explore\command=sond/Mircr0dll.exe
{garbage characters}
useautoplay=1
{garbage characters}

Backdoor Routine

This worm opens a random port to allow a remote user to connect to the affected system. Once a successful connection is established, the remote user executes commands on the affected system.

It executes the following commands from a remote malicious user:

• Launch TCP or UDP flood
• Download and execute files from the internet
• Visit websites

It connects to the following websites to send and receive information:

• {BLOCKED}i.panadool400.com
• {BLOCKED}i.xylocomod.com
• {BLOCKED}p.xylocomod.com
• {BLOCKED}p.xylocomoda.com
• {BLOCKED}p.xylocomods.com
• www.{BLOCKED}1.com
• www.{BLOCKED}2.com
• www.{BLOCKED}3.com
• www.{BLOCKED}4.com
• www.{BLOCKED}5.com

Other Details

However, as of this writing, the said sites are inaccessible.

NOTES:

It may arrive via MSN Messenger.

It does not continue with its routine if the if the malware file name is C:\file.exe or C:\sample.exe or if the user name is CurrentUser.

It is capable of propagating via MSN Messenger by sending messages containing a link where a copy of itself may be downloaded.