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VBS_AGENT.EC

October 12, 2012
 ALIASES:

SettingsModifier:Win32/PossibleHostsFileHijack, Scanning damaged file () (Microsoft); [XIAOSLAL.CMD\XXXZZZAASS.EXE]:Generic Del.x!t, [(3).RMVB]:corrupted (McAfee); Trojan.ADH (Symantec); Potentially Infected Hosts File (v), Trojan.Win32.Generic!BT, Trojan.Win32.Generic!BT, Trojan.Win32. (Sunbelt); Gen:Trojan.StartPage.aaW@aaaaa (FSecure)

 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:

2,562,895 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

18 Nov 2011

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 creates the following folders:

  • %Program Files%\aldlslwld
  • %Program Files%\aldlslwld\tubiao

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.)

Other System Modifications

This Trojan adds the following registry keys:

HKEY_CURRENT_USER\Software\WinRAR SFX

It adds the following registry entries:

HKEY_CURRENT_USER\Software\WinRAR SFX
C%%Program Files%aldlslwld%tubiao = "%Program Files%\aldlslwld\tubiao"

Dropping Routine

This Trojan drops the following files:

  • __tmp_rar_sfx_access_check_41875
  • xiaoslal.cmd
  • (1.rmvb
  • (2).rmvb
  • (3).rmvb

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

[ 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
    • WinRAR SFX

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\WinRAR SFX
    • C%%Program Files%aldlslwld%tubiao="%Program Files%\aldlslwld\tubiao"

Step 4

Search and delete these folders

[ 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.
  • %Program Files%\aldlslwld
  • %Program Files%\aldlslwld\tubiao

Step 5

Search and delete these files

[ Learn More ]
There may be some component files 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.
  • __tmp_rar_sfx_access_check_41875
  • xiaoslal.cmd
  • (1.rmvb
  • (2).rmvb
  • (3).rmvb

Step 6

Scan your computer with your Trend Micro product to delete files detected as VBS_AGENT.EC. 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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