WORM_IRCBOT.JPA
Windows 2000, XP, Server 2003
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Worm
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
Propagates via removable drives
This worm arrives via removable drives. It may be downloaded by other malware/grayware/spyware from remote sites. It may be unknowingly downloaded by a user while visiting malicious websites.
It adds registry entries to enable its automatic execution at every system startup.
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
136,192 bytes
PE
Yes
27 Oct 2010
Compromises system security
Arrival Details
This worm arrives via removable drives.
It may be downloaded by other malware/grayware/spyware from remote sites.
It may be unknowingly downloaded by a user while visiting malicious websites.
Installation
This worm drops the following component file(s):
- %Application Data%\google_cache{random numbers}.tmp - non-malicious file
- {drive letter}:\ProductInstall\FSA-5916-37591-2352322-634621321-6662355\Desktop.ini - non-malicious file
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Windows\Profiles\{user name}\Application Data on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Application Data on Windows NT, and C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003.)
It drops the following copies of itself into the affected system:
- %Application Data%\lsass.exe
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Windows\Profiles\{user name}\Application Data on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Application Data on Windows NT, and C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003.)
It adds the following mutexes to ensure that only one of its copies runs at any one time:
- MPoNvDde
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
Local Security Authentication Server = %Application Data%\lsass.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
Local Security Authentication Server = %Application Data%\lsass.exe
Propagation
This worm creates the following folders in all removable drives:
- {drive letter}:\ProductInstall
- {drive letter}:\ProductInstall\FSA-5916-37591-2352322-634621321-6662355
It drops the following copy(ies) of itself in all removable drives:
- {drive letter}:\ProductInstall\FSA-5916-37591-2352322-634621321-6662355\Install.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]
open=ProductInstall\FSA-5916-37591-2352322-634621321-6662355\Install.exe
icon=%System%\SHELL32.dll,4
action=Open folder to view files
shell\open\command=ProductInstall\FSA-5916-37591-2352322-634621321-6662355\Install.exe
shell\open\default=1
(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.)
Backdoor Routine
This worm connects to the following URL(s) to send and receive commands from a remote malicious user:
- syn.{BLOCKED}128.info
NOTES:
It executes the following commands from a remote malicious user:
- Update itself
- Remove itself and registry modifications
- Download additional files
- Terminate a process
- Execute a file
SOLUTION
8.900
Step 1
For Windows ME and XP users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.
Step 2
Identify and terminate files detected as WORM_IRCBOT.JPA
- For Windows 98 and ME users, Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
- If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
- If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.
Step 3
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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- Local Security Authentication Server = %Application Data%\lsass.exe
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- Local Security Authentication Server = %Application Data%\lsass.exe
Step 4
Search and delete AUTORUN.INF files created by WORM_IRCBOT.JPA that contain these strings
[AutoRun]
open=ProductInstall\FSA-5916-37591-2352322-634621321-6662355\Install.exe
icon=%System%\SHELL32.dll,4
action=Open folder to view files
shell\open\command=ProductInstall\FSA-5916-37591-2352322-634621321-6662355\Install.exe
shell\open\default=1
Step 5
Search and delete these files
- %Application Data%\google_cache{random numbers}.tmp
Step 6
Search and delete this folder
- {drive letter}:\ProductInstall
- {drive letter}:\ProductInstall\FSA-5916-37591-2352322-634621321-6662355
Step 7
Scan your computer with your Trend Micro product to delete files detected as WORM_IRCBOT.JPA 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.
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