TSPY_ZBOT.MLJ


 ALIASES:

PWS:Win32/Zbot.gen!AL (Microsoft); PWS-Zbot.gen.aua (McAfee); Trojan-Spy.Win32.Zbot.igxu (Kaspersky)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 OVERALL RISK RATING:
 REPORTED INFECTION:
 SYSTEM IMPACT RATING:
 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:

310,776 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

01 Feb 2013

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 creates the following folders:

  • %User Profile%\Application Data\Gyhuar

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)

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
{58C4EBA0-47A8-AD40-8C85-A85A94978B48} = "%User Profile%\Gyhuar\oqca.exe"

Other System Modifications

This spyware adds the following registry keys:

HKEY_CURRENT_USER\Software\Microsoft\
Inal

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager
Server ID = "4"

HKEY_CURRENT_USER\Software\Microsoft\
Inal
28g6hcdg = "sNR+6W6nyduqvxDQdcUanQ==?_CHAR(0x07)_?"

HKEY_CURRENT_USER\Software\Microsoft\
Inal
243ddcca = "ydQQ6Q==?"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile
DisableNotifications = "1"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\GloballyOpenPorts\
List
27616:UDP = "27616:UDP:*:Enabled:UDP 27616"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile
DisableNotifications = "0"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\GloballyOpenPorts\
List
29261:TCP = "29261:TCP:*:Enabled:TCP 29261"

HKEY_CURRENT_USER\Software\Microsoft\
Inal
7ai4he6 = "{random values}"

HKEY_CURRENT_USER\Software\Microsoft\
Inal
1fdbhg87 = "{random values}"

HKEY_CURRENT_USER\Software\Microsoft\
Inal
2b16d2cf = "{random characters}"

HKEY_CURRENT_USER\Software\Microsoft\
Inal
243ddcca = "yNQQ6Q==Ø_CHAR(0x03)_?ã?ã?ã?? "

Dropping Routine

This spyware drops the following files:

  • %User Profile%\Application Data\Gyhuar
  • %User Profile%\Gyhuar\oqca.exe
  • %Application Data%\zeacfa.usy

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.. %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.)

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.300

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Restart in Safe Mode

[ Learn More ]

Step 3

Delete this registry key

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_CURRENT_USER\Software\Microsoft
    • Inal

Step 4

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • {58C4EBA0-47A8-AD40-8C85-A85A94978B48} = "%User Profile%\Gyhuar\oqca.exe"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager
    • Server ID = "4"
  • In HKEY_CURRENT_USER\Software\Microsoft\Inal
    • 28g6hcdg = "sNR+6W6nyduqvxDQdcUanQ==?_CHAR(0x07)_?"
  • In HKEY_CURRENT_USER\Software\Microsoft\Inal
    • 243ddcca = "ydQQ6Q==?"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile
    • DisableNotifications = "1"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\GloballyOpenPorts\List
    • 27616:UDP = "27616:UDP:*:Enabled:UDP 27616"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile
    • DisableNotifications = "0"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\GloballyOpenPorts\List
    • 29261:TCP = "29261:TCP:*:Enabled:TCP 29261"
  • In HKEY_CURRENT_USER\Software\Microsoft\Inal
    • 7ai4he6 = "{random values}"
  • In HKEY_CURRENT_USER\Software\Microsoft\Inal
    • 1fdbhg87 = "{random values}"
  • In HKEY_CURRENT_USER\Software\Microsoft\Inal
    • 2b16d2cf = "{random characters}"
  • In HKEY_CURRENT_USER\Software\Microsoft\Inal
    • 243ddcca = "yNQQ6Q==Ø_CHAR(0x03)_?ã?ã?ã?? "

Step 5

Search and delete these components

[ Learn More ]
There may be some components that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
  • %User Profile%\Application Data\Gyhuar
  • %User Profile%\Gyhuar\oqca.exe
  • %Application Data%\zeacfa.usy

Step 6

Search and delete this folder

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %User Profile%\Application Data\Gyhuar

Step 7

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TSPY_ZBOT.MLJ. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.


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