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TROJ_DLOADER.LHY

October 09, 2012
 ALIASES:

TrojanDownloader:Win32/Busky (Microsoft); Downloader-AXI (McAfee); Trojan.Packed.14 (Symantec); PAK:UPX, Trojan.Win32.Obfuscated.ev (Kaspersky)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

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.

  TECHNICAL DETAILS

File Size:

15,872 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

08 Oct 2012

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.

Other System Modifications

This Trojan deletes the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\AdwareDisableKey3

HKEY_LOCAL_MACHINE\SOFTWARE\AdwareDisableKey4

HKEY_CURRENT_USER\SOFTWARE\AdwareDisableKey3

HKEY_CURRENT_USER\SOFTWARE\AdwareDisableKey4

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.200

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Scan your computer with your Trend Micro product to delete files detected as TROJ_DLOADER.LHY. 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.

Step 3

Restore these deleted registry keys/values from backup

*Note: Only Microsoft-related keys/values will be restored. If the malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.

  • In HKEY_LOCAL_MACHINE\SOFTWARE
    • AdwareDisableKey3
  • In HKEY_LOCAL_MACHINE\SOFTWARE
    • AdwareDisableKey4
  • In HKEY_CURRENT_USER\SOFTWARE
    • AdwareDisableKey3
  • In HKEY_CURRENT_USER\SOFTWARE
    • AdwareDisableKey4


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