WORM_EMBEDDED.GM

This worm arrives by connecting affected removable drives to a system. 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.

Arrival Details

This worm arrives by connecting affected removable drives to a system.

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:

• %System%\csrcs.exe

(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)

It drops the following files:

• %System Root%\khq
• %System%\autorun.inf
• %System%\cftm.exe
• %User Temp%\suicide.bat

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.. %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.)

Autostart Technique

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer\Run
csrcs = "%System%\csrcs.exe"

It modifies the following registry entries to ensure it automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
Shell = "Explorer.exe csrcs.exe"

(Note: The default value data of the said registry entry is Explorer.exe.)

Other System Modifications

This worm adds the following registry entries as part of its installation routine:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings
GlobalUserOffline = "0"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
DRM\amty
ilop = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
DRM\amty
fix = ""

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
DRM\amty
exp1 = "{hex values}"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
DRM\amty
dreg = "{hex values}"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
DRM\amty
eggol = "0"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
DRM\amty
regexp = "{numbers}"

It adds the following registry keys as part of its installation routine:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
DRM\amty

It modifies the following registry entries to hide files with Hidden attributes:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
Hidden = "2"

(Note: The default value data of the said registry entry is 1.)

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
SuperHidden = "0"

(Note: The default value data of the said registry entry is 1.)

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
ShowSuperHidden = "0"

(Note: The default value data of the said registry entry is 1.)

Propagation

This worm drops the following copy(ies) of itself in all removable drives:

• {random}.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:

;{garbage}
[AutoRun]
;{garbage}
open={random}.exe
;{garbage}
shell\open\Command={random}.exe
;{garbage}
shell\open\Default=1
;{garbage}
shell\explore\Command={random}.exe
;{garbage}

Other Details

This worm connects to the following URL(s) to get the affected system's IP address:

• http://www.whatismyip.com

It connects to the following possibly malicious URL:

• http://{BLOCKED}.dip.jp:6854/pro.gif
• http://{BLOCKED}.19.236:7358/xDIUYSDFIGU876SXCGHSD54G6SD.php
• http://{BLOCKED}.19.238:4600/xDIUYSDFIGU876SXCGHSD54G6SD.php
• http://{BLOCKED}.19.238:5400/527914L17MQ17YV8420ENMWXGVPZ/Q(995).da
• http://{BLOCKED}.19.236:88/xxxxxFD65456DF4Y9876554DFH34DF654H64RY897.php
• http://{BLOCKED}.19.238:5300/xxxxxFD65456DF4Y9876554DFH34DF654H64RY897.php
• http://{BLOCKED}.19.237:5200/536314S17IY17XX8613NWFRNASRS/Q(999).da