WORM_SPYBOT.BOW
Windows 2000, Windows XP, Windows Server 2003
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Worm
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This worm arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
It deletes itself after execution.
TECHNICAL DETAILS
Arrival Details
This worm 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.)
Autostart Technique
This worm 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 deletes the following files:
- %System%\$winnt$.inf
- %System%\-1
- %System%\12520437.cpx
- %System%\12520850.cpx
- %System%\6to4svc.dll
- %System%\72104321.exe
- %System%\aaaamon.dll
- %System%\access.cpl
- %System%\acctres.dll
- %System%\accwiz.exe
- %System%\acelpdec.ax
- %System%\acledit.dll
- %System%\aclui.dll
- %System%\activeds.dll
(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 adds the following registry keys:
HKEY_LOCAL_MACHINE\Software\Microsoft\
DRM\amty
HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\policies\
Explorer\Run
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
DRM\amty
ilop = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer\Run
csrcs = "%System%\csrcs.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
DRM\amty
fix1 = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
DRM\amty
exp1 = "{random characters}"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
DRM\amty
dreg = "{random characters}"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
DRM\amty
xdferx = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
DRM\amty
eggol = "0"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
DRM\amty
Fsetsn6DeD = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
DRM\amty
regexp = "0.979354596376429"
Dropping Routine
This worm drops the following files:
- %User Temp%\aut1.tmp
- %User Temp%\adolgzl
- %User Temp%\aut2.tmp
- %User Temp%\bizffqp
- %System%\HpqpPhUnl.exe
- RegShellSM.exe
- %User Temp%\aut3.tmp
- %User Temp%\fldjtfh
- %System%\72104321.exe
(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.. %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.)
Other Details
This worm connects to the following possibly malicious URL:
- http://pgy.{BLOCKED}su.com:4800/po.php
- http://www.{BLOCKED}myip.com/automation/n09230945.asp
- http://pgy.{BLOCKED}su.com:4800/banner.gif
- http://{BLOCKED}7.19.236:4700/f.php
- http://{BLOCKED}7.19.236/re.gif
- http://{BLOCKED}7.19.236:5400/re.gif
- http://{BLOCKED}atebay.org/top/401
- http://{BLOCKED}t.com/torrents/?iht=5&ihs1=2&age=0
- http://{BLOCKED}7.19.236:4700/fruits.htm
It deletes itself after execution.
This report is generated via an automated analysis system.
SOLUTION
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
Identify and delete files detected as WORM_SPYBOT.BOW using either the Startup Disk or Recovery Console
Step 3
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\Software\Microsoft\DRM
- amty
- In HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\policies\Explorer
- Run
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_LOCAL_MACHINE\SOFTWARE\Microsoft\DRM\amty
- ilop = "1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\Run
- csrcs = "%System%\csrcs.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\DRM\amty
- fix1 = "1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\DRM\amty
- exp1 = "{random characters}"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\DRM\amty
- dreg = "{random characters}"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\DRM\amty
- xdferx = "1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\DRM\amty
- eggol = "0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\DRM\amty
- Fsetsn6DeD = "1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\DRM\amty
- regexp = "0.979354596376429"
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\Winlogon
- From: Shell = "Explorer.exe csrcs.exe"
To: Shell = ""Explorer.exe""
- From: Shell = "Explorer.exe csrcs.exe"
Step 6
Search and delete these files
- %User Temp%\aut1.tmp
- %User Temp%\adolgzl
- %User Temp%\aut2.tmp
- %User Temp%\bizffqp
- %System%\HpqpPhUnl.exe
- RegShellSM.exe
- %User Temp%\aut3.tmp
- %User Temp%\fldjtfh
- %System%\72104321.exe
Step 7
Scan your computer with your Trend Micro product to delete files detected as WORM_SPYBOT.BOW. 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 8
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%\$winnt$.inf
- %System%\-1
- %System%\12520437.cpx
- %System%\12520850.cpx
- %System%\6to4svc.dll
- %System%\72104321.exe
- %System%\aaaamon.dll
- %System%\access.cpl
- %System%\acctres.dll
- %System%\accwiz.exe
- %System%\acelpdec.ax
- %System%\acledit.dll
- %System%\aclui.dll
- %System%\activeds.dll
Did this description help? Tell us how we did.