TSPY_ZBOT.YAS

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.

It deletes itself after execution.

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

• %Application Data%\{random folder name}\{random filename 2}.exe-modified copy

(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 adds the following processes:

• {malware path} /AutoIt3ExecuteScript %User Temp%\uvhPjunFq

(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.)

Other System Modifications

This spyware deletes the following files:

• %User Temp%\*.lnk

(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 adds the following registry keys:

HKEY_CURRENT_USER\Software\Microsoft\
{random letters 1}

It adds the following registry entries:

HKEY_USERS\{SID}
"" = "{hex values}"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings
WarnonBadCertRecving = "0"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings
EnableSPDY3_0 = "0"

HKEY_CURRENT_USER\Software\Microsoft\
{random letters 1}
{random letters 2} = ""

Dropping Routine

This spyware drops the following files:

• %User Temp%\uvhPjunFq
• %User Temp%\{temp name}.bat-used for self delete(will also be delete after execution)

(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.)

Other Details

This spyware connects to the following possibly malicious URL:

• {BLOCKED}aepgfiaeirod.ru
• {BLOCKED}ueztuzqe.ru
• {BLOCKED}uaklzwudo.ru
• {BLOCKED}uroowdufa.ru
• {BLOCKED}eodhsheu.ru
• {BLOCKED}gfugfgedr.ru
• {BLOCKED}fhoahifd.ru
• {BLOCKED}gahoehih.ru
• {BLOCKED}daswadeaef.ru
• {BLOCKED}uszemnza.ru
• {BLOCKED}aegzgzegd.su
• {BLOCKED}fzaihfud.su
• {BLOCKED}wuzudhuf.su
• {BLOCKED}zafzgzfe.su
• {BLOCKED}wueifik.su
• {BLOCKED}moacuza.su

It deletes itself after execution.