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TSPY_ZLADER.I

July 08, 2016
 Analysis by: Cris Nowell Pantanilla
 ALIASES:

PWS:Win32/Fareit (Microsoft), Trojan.Win32.Deshacop.cuk (Kaspersky)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet


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

It also has rootkit capabilities, which enables it to hide its processes and files from the user.

However, as of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size:

79,872 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

01 Jul 2016

Payload:

Connects to URLs/IPs, Hides files and processes

Arrival Details

This Trojan 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 Trojan adds the following processes:

  • explorer.exe
  • svchost.exe

It injects codes into the following process(es):

  • explorer.exe
  • svchost.exe

Autostart Technique

This Trojan registers as a system service to ensure its automatic execution at every system startup by adding the following registry keys:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\ftd{5 random numbers}.tmp
Type = 1

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\ftd{5 random numbers}.tmp
Start = 4

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\ftd{5 random numbers}.tmp
ErrorControl = 1

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\ftd{5 random numbers}.tmp
ImagePath = %User Temp%\ftd{5 random numbers}.tmp

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\ftd{5 random numbers}.tmp
DisplayName = "ftd{5 random numbers}.tmp"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\ftd{5 random numbers}.tmp
DeleteFlag = 1

Rootkit Capabilities

This Trojan also has rootkit capabilities, which enables it to hide its processes and files from the user.

Process Termination

This Trojan terminates the following services if found on the affected system:

  • WINDEFEND
  • MPSSVC
  • WSCSVC
  • WUAUSERV

Other Details

This Trojan connects to the following possibly malicious URL:

  • {BLOCKED}othat.com

However, as of this writing, the said sites are inaccessible.

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

12.624.02

FIRST VSAPI PATTERN DATE:

01 Jul 2016

VSAPI OPR PATTERN File:

12.625.00

VSAPI OPR PATTERN Date:

01 Jul 2016

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. Before you could do this, you must restart in Safe Mode. For instructions on how to do this, you may refer to this page If the preceding step requires you to restart in safe mode, you may proceed to edit the system registry.

 
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
    • ftd{5 random numbers}.tmp

Step 4

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