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WORM_AVKILL.SMM

October 13, 2012
 ALIASES:

Trojan:Win32/Agent (Microsoft); Generic Dropper.oa (McAfee); Trojan Horse (Symantec); Virus.Win32.Lamer.cf (Kaspersky); Worm.Win32.AVKill.smm (v) (Sunbelt); Worm.Generic.102647 (FSecure)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


This worm 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:

834,573 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

19 Jun 2012

Arrival Details

This worm 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 worm drops the following copies of itself into the affected system:

  • %System%\verona\EyeDistorsion.exe
  • a:\setup.exe

(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)

It creates the following folders:

  • %System%\verona

(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)

Other System Modifications

This worm adds the following registry keys:

HKEY_CURRENT_USER\software\verona

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Advanced INF Setup\strLink

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Advanced INF Setup\appTitle

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Advanced INF Setup\proRunNum

It adds the following registry entries:

HKEY_CURRENT_USER\Software\verona
id = "26127164"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Advanced INF Setup
strLink = "011e4c638737380d75c177095db6a828"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Advanced INF Setup
appTitle = "011e4c638737380d75c177095db6a828"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Advanced INF Setup
proRunNum = "1"

Dropping Routine

This worm drops the following files:

  • a:\autorun.inf

Other Details

This worm connects to the following possibly malicious URL:

  • http://{BLOCKED}sitec.org/loader/gate.php?id=26127164

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
    • verona
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Advanced INF Setup
    • strLink
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Advanced INF Setup
    • appTitle
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Advanced INF Setup
    • proRunNum

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\verona
    • id = "26127164"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Advanced INF Setup
    • strLink = "011e4c638737380d75c177095db6a828"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Advanced INF Setup
    • appTitle = "011e4c638737380d75c177095db6a828"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Advanced INF Setup
    • proRunNum = "1"

Step 4

Search and delete this file

[ 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.
  • a:\autorun.inf

Step 5

Search and delete this folder

[ 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.
  • %System%\verona

Step 6

Scan your computer with your Trend Micro product to delete files detected as WORM_AVKILL.SMM. 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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