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TSPY_ZLADER.A

March 14, 2014
 Analysis by: Sabrina Lei Sioting
 ALIASES:

Win32/Injector.AVKY (Eset), Trojan.Win32.Inject (Ikarus), Trojan.Win32.Inject.hgar (Kaspersky), Trojan:Win32/Stoberox.B (Microsoft), Troj/Wonton-P (Sophos),

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Spyware

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware

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 commands from a remote malicious user, effectively compromising the affected system.

  TECHNICAL DETAILS

File Size:

141,312 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

10 Mar 2014

Payload:

Connects to URLs/IPs, Collects system information

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:

  • {installation folder}\{random}\{random}.{random}

It adds the following processes:

  • explorer.exe

It injects codes into the following process(es):

  • explorer.exe

Autostart Technique

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows NT\CurrentVersion\Windows
Run = "{installation folder}\{random}\{random}.{random}"

Other System Modifications

This spyware creates the following registry entry(ies) to bypass Windows Firewall:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\GloballyOpenPorts\
List
{port}:TCP = "{port}:TCP:*:Enabled:Remote Assistance Remote"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\GloballyOpenPorts\
List
{port}:TCP = "{port}:TCP:*:Enabled:Remote Assistance Local"

Backdoor Routine

This spyware executes the following commands from a remote malicious user:

  • Download other files

Information Theft

This spyware gathers the following data:

  • Computer Name
  • Volume Serial Number
  • OS version
  • IP address

Stolen Information

This spyware sends the gathered information via HTTP POST to the following URL:

  • http://{BLOCKED}info.cc/common/man.php

NOTES:

The {installation folder} could be any of the following:

  • %Application Data%
  • %AppDataLocal%
  • %User Profile%\My Documents

The created folder is the same as the filename of the dropped copy.

The extention of the dropped copy could be any of the following:

  • .pif
  • .com
  • .exe

  SOLUTION

Minimum Scan Engine:

9.700

FIRST VSAPI PATTERN FILE:

10.660.08

FIRST VSAPI PATTERN DATE:

12 Mar 2014

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 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 NT\CurrentVersion\Windows
    • Run = "{installation folder}\{random}\{random}.{random}"
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\GloballyOpenPorts\List
    • {port}:TCP = "{port}:TCP:*:Enabled:Remote Assistance Remote"
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\GloballyOpenPorts\List
    • {port}:TCP = "{port}:TCP:*:Enabled:Remote Assistance Local"

Step 4

Scan your computer with your Trend Micro product to delete files detected as TSPY_ZLADER.A. 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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