TROJ_UPATRE.HJ

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 executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

It deletes the initially executed copy of itself.

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.

Installation

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

• %User Temp%\nlibzar.exe

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

It drops the following files:

• %User Temp%\bwtBBCB.tmp

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

Download Routine

This Trojan accesses the following websites to download files:

• http://{BLOCKED}rosonline.net/wp-includes/css/mandoc1.pdf
• http://{BLOCKED}mis.com/mandoc1.pdf
• http://{BLOCKED}mis.com/cgi-sys/suspendedpage.cgi

It saves the files it downloads using the following names:

• %Windows%\{random}.exe

(Note: %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)

It then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

Other Details

This Trojan connects to the following URL(s) to get the affected system's IP address:

• http://checkip.dyndns.org

It deletes the initially executed copy of itself

NOTES:

It also accesses the following URL before download:

• {BLOCKED}1.{BLOCKED}5.141.87:13895/0704uk11/{COMPUTER NAME}/0/{OS VERSION}/0/{ENCRYPTED IP}
• {BLOCKED}1.{BLOCKED}5.141.87:13895/0704uk11/{COMPUTER NAME}/41/2/{ServicePack}/0/{ENCRYPTED IP}