TROJ_EXPLOYT.XLT

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users. 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 does not have any propagation routine.

It does not have any backdoor routine.

It takes advantage of software vulnerabilities to allow a remote user or malware/grayware to download files. As of this writing, the said sites are inaccessible.

Arrival Details

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

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

Propagation

This Trojan does not have any propagation routine.

Backdoor Routine

This Trojan does not have any backdoor routine.

Download Routine

This Trojan connects to the following website(s) to download and execute a malicious file:

• http://{BLOCKED}hemes.com/flash.exe

It takes advantage of the following software vulnerabilities to allow a remote user or malware/grayware to download files:

• Adobe Reader And Acrobat Integer wraparound vulnerability (CVE-2013-2729)

It saves the files it downloads using the following names:

• %Temporary Internet Files%\Flash.exe

(Note: %Temporary Internet Files% is the Temporary Internet Files folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temporary Internet Files on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Microsoft\Windows\Temporary Internet Files on Windows Vista and 7.)

As of this writing, the said sites are inaccessible.

NOTES:

For OS versions in 6.0 and above (Windows Vista and above):

This malware will perform the malicious routines mentioned above if it is running under the following versions of Adobe Reader:

• 9.303
• 9.304
• 9.4
• 9.401
• 9.402
• 9.403
• 9.404
• 9.405
• 9.406
• 9.407
• 9.5
• 9.501
• 9.502
• 9.503
• 9.504
• 10.101
• 10.102
• 10.103
• 10.104
• 10.105
• 10.106
• 11
• 11.001

For OS versions below 6.0 (Windows Server 2003 R2 and below):

This malware will perform an infinite loop causing the affected Adobe Reader to hang/freeze.