TSPY_ZBOT.A
Windows 2000, Windows XP, Windows Server 2003
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.
It executes then deletes itself afterward.
TECHNICAL DETAILS
170343 bytes
EXE
Yes
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%\{random1}\{random}.exe
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.)
It drops the following files:
- %Application Data%\{random2}\{random}.{random}
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.)
It creates the following folders:
- %Application Data%\{random1}
- %Application Data%\{random2}
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.)
It executes then deletes itself afterward.
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} = "%Application Data%\{random}\{random}.exe"
Other System Modifications
This spyware adds the following registry entries as part of its installation routine:
HKEY_CURRENT_USER\Software\Microsoft\
{random}
{random1} = "{hex values}"
HKEY_CURRENT_USER\Software\Microsoft\
{random}
{random2} = "{hex values}"
It creates the following registry entry(ies) to bypass Windows Firewall:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
C:\WINDOWS\explorer.exe = "C:\WINDOWS\explorer.exe:*:Enabled:Windows Explorer"
Other Details
This spyware connects to the following URL(s) to check for an Internet connection:
- www.google.com.ph
It connects to the following possibly malicious URL:
- {BLOCKED}06-g5.free.fr
- {BLOCKED}8.{BLOCKED}9.251.247
- {BLOCKED}e.{BLOCKED}n.free.fr
NOTES:
It may also get stored passwords in the following registry locations:
- HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager\Accounts\Active Directory GC
- HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager\Accounts\Bigfoot
- HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager\Accounts\Verisign
- HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager\Accounts\WhoWhere
All gathered information are then saved and encrypted to the following file, and sent later on to its server:
- %Application Data%\{random2}\{random}.{random}