TrojanDownloader:Win32/WinShow (Microsoft); BackDoor-BDD (McAfee); Adware.Iefeats (Symantec); PAK:UPX, Trojan.Win32.Agent.bi (Kaspersky); Trojan.Win32.Agent.bi (v) (Sunbelt); Adware.Generic.242591 (FSecure)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 OVER ALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
Low
Medium
High
Critical

  • 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: 11,895 bytes
File type: EXE
Memory resident: No
INITIAL SAMPLES RECEIVED DATE: 09 July 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 adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{629058CD-0897-0154-04D4-3DE1744100AD}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{629058CD-0897-0154-04D4-3DE1744100AD}\LocalServer32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{629058CD-0897-0154-04D4-3DE1744100AD}\Data

It deletes the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
PROTOCOLS\Filter\text/html

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
PROTOCOLS\Filter\text/plain

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

Delete this registry key

[ learnMore ]

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_LOCAL_MACHINE\SOFTWARE\Classes\CLSID
    • {629058CD-0897-0154-04D4-3DE1744100AD}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{629058CD-0897-0154-04D4-3DE1744100AD}
    • LocalServer32
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{629058CD-0897-0154-04D4-3DE1744100AD}
    • Data

Step 3

Scan your computer with your Trend Micro product to delete files detected as TROJ_AGENT.ZII. 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 4

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\Classes\PROTOCOLS\Filter
    • text/html
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\PROTOCOLS\Filter
    • text/plain


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