TROJ_AGENTT.QI

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.

It modifies files, disabling programs and applications from properly running.

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 creates the following folders:

• %User Temp%\$inst
• %Program Files%\Live
• %User Profile%\CryptnetUrlCache\MetaData
• %User Profile%\Microsoft\CryptnetUrlCache
• %User Profile%\CryptnetUrlCache\Content

(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.. %Program Files% is the default Program Files folder, usually C:\Program Files.. %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_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
sys = "%Windows%\wan.exe"

Other System Modifications

This Trojan modifies the following files:

• %Application Data%\GDIPFONTCACHEV1.DAT

(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 deletes the following files:

• %User Temp%\$inst\0.tmp
• %User Temp%\$inst\1.tmp
• %User Temp%\$inst\3.tmp
• %User Temp%\$inst\4.tmp
• %User Temp%\$inst\5.tmp
• %User Temp%\$inst\6.tmp
• %User Temp%\$inst\7.tmp
• %User Temp%\$inst\8.tmp
• %User Temp%\$inst\9.tmp
• %User Temp%\$inst\10.tmp
• %User Temp%\$inst\11.tmp
• %User Temp%\$inst\12.tmp
• %User Temp%\$inst\13.tmp
• %User Temp%\$inst\14.tmp
• %User Temp%\$inst\15.tmp
• %User Temp%\$inst\16.tmp
• %User Temp%\$inst\17.tmp
• %User Temp%\$inst\20.tmp
• %User Temp%\$inst\50.tmp
• %User Temp%\$inst\21.tmp
• %User Temp%\$inst\51.tmp

(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.)

It modifies the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
GDIPlus
FontCachePath = "%Application Data%"

(Note: The default value data of the said registry entry is %User Profile%\Local Settings\Application Data.)

Dropping Routine

This Trojan drops the following files:

• %User Temp%\$inst\2.tmp
• %User Temp%\$inst\temp_0.tmp
• %Windows%\wan.exe
• %User Profile%\Logs\2011-12-30_17-33_7a4-5kjez3mk.log
• %User Profile%\MetaData\7B2238AACCEDC3F1FFE8E7EB5F575EC9
• %User Profile%\Content\7B2238AACCEDC3F1FFE8E7EB5F575EC9
• %User Profile%\MetaData\3130B1871A126520A8C47861EFE3ED4D
• %User Profile%\Content\3130B1871A126520A8C47861EFE3ED4D

(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.. %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.. %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.