TROJ_IRCBOT.CRB

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Arrival Details

This Trojan 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 Trojan drops the following copies of itself into the affected system:

• %User Profile%\AppServices.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.)

Autostart Technique

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
A-1639095458 = "%User Profile%\Application Data\A-1639095458.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\RunOnce
A-1639095458 = "%User Profile%\Application Data\A-1639095458.exe"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
A-1639095458 = "%User Profile%\Application Data\A-1639095458.exe"

Other System Modifications

This Trojan deletes the following files:

• .
• ..
• 58e0ef.mst
• AdobeARM.log
• AdobeSFX.log
• ASPNETSetup_00000.log
• ASPNETSetup_00001.log
• ASPNETSetup_00002.log
• dd_depcheck_NETFX_EXP_35.txt
• dd_dotnetfx35error.txt
• dd_dotnetfx35install.txt
• dd_dotNetFx40_Full_x86_x64_decompression_log.txt
• dd_MSXML6_MSI0686.txt
• dd_netfx20MSI7F16.txt
• dd_netfx20UI7F16.txt
• dd_NET_Framework20_Setup06A7.txt
• dd_NET_Framework30_Setup0775.txt
• dd_NET_Framework35_MSI07B9.txt
• dd_RGB9RAST_x86.msi0683.txt
• dd_vcredistMSI7C21.txt
• dd_vcredistUI7C21.txt
• dd_wcf_CA_smci_20111017_044900_062.txt
• dd_wcf_retCA29BA.txt
• dd_WIC.txt
• dd_XPS.txt
• Microsoft .NET Framework 4 Setup_20111016_234618578-MSI_netfx_Core_x86.msi.txt
• Microsoft .NET Framework 4 Setup_20111016_234618578-MSI_netfx_Extended_x86.msi.txt
• Microsoft .NET Framework 4 Setup_20111016_234618578.html
• Microsoft .NET Framework 4 Setup_4.0.30319
• Microsoft Visual C++ 2010 x86 Redistributable Setup_10.0.30319
• Microsoft Visual C++ 2010 x86 Redistributable Setup_20111020_000954642-MSI_vc_red.msi.txt
• Microsoft Visual C++ 2010 x86 Redistributable Setup_20111020_000954642.html
• temp-1639095458.bat
• uxeventlog.txt
• vminst.log
• vmmsi.log
• WSFF8.tmp
• WSFF9.tmp
• AppServices.exe

Dropping Routine

This Trojan drops the following files:

• %User Startup%\A-1639095458.exe
• %User Profile%\Application Data\A-1639095458.exe

(Note: %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup.. %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.)

This report is generated via an automated analysis system.