TSPY_ZBOT.YUYADR

June 05, 2015

Analysis by: Ryan Gardo

PLATFORM:

Windows

OVERALL RISK RATING:

DAMAGE POTENTIAL:

DISTRIBUTION POTENTIAL:

REPORTED INFECTION:

INFORMATION EXPOSURE:

Threat Type: Spyware
Destructiveness: No
Encrypted:
In the wild: Yes

OVERVIEW

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

TECHNICAL DETAILS

File Size:

311,296 bytes

File Type:

EXE

Initial Samples Received Date:

04 Jun 2015

Arrival Details

This spyware 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 spyware adds the following folders:

%Application Data%\{Random Folder1}
%Application Data%\{Random Folder2}
%Application Data%\{Random Folder3}

(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming 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 copies of itself into the affected system:

%Application Data%\{Random Folder1}\{Random Filename}.exe

It drops the following files:

%Application Data%\{Random Folder2}\{Random Filename1}.{Random Extension Name1}
%Application Data%\{Random Folder3}\{Random Filename2}.{Random Extension Name2}

Autostart Technique

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{Random Value} = “{Application Data}\{Random Folder1}\{Random Filename}.exe”

Other System Modifications

This spyware adds the following registry keys:

HKEY_CURRENT_USER\Software\Microsoft\
{Random key}
{Random Value1} = “{Encrypted Config}”

HKEY_CURRENT_USER\Software\Microsoft\
{Random key}
{Random Value2} = “{Random Hex values}”

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Privacy
CleanCookies = "0"

It modifies the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
Zones\0
1609 = "0"