WORM_BAGLE.SMA

September 06, 2013
 ALIASES:

TrojanDownloader:Win32/Bagle.ACB (Microsoft); Generic Downloader.x!fhn (McAfee); Trojan Horse (Symantec); Trojan-Downloader.Win32.Bagle.dyy (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan.Generic.3013129 (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:

842,244 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

04 Nov 2011

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:

  • %Program Files%\Messenger\msmsgs.exe

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)

It creates the following folders:

  • %User Profile%\Application Data\drivers
  • %User Profile%\downld\

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)

Other System Modifications

This worm adds the following registry keys:

HKEY_CURRENT_USER\Software\Local AppWizard-Generated Applications

hkey_current_user\software\local appwizard-generated applications\
{malware file name}

hkey_current_user\software\local appwizard-generated applications\
{malware file name}\recent file list

hkey_current_user\software\local appwizard-generated applications\
{malware file name}\settings

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\Security Center\Svc

HKEY_CURRENT_USER\Software\bisoft

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\Security Center\Svc
EnableLUA = "16"

HKEY_CURRENT_USER\Software\bisoft
frstrunn = "1"

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.200

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

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
    • Local AppWizard-Generated Applications
  • In hkey_current_user\software\local appwizard-generated applications
    • {malware file name}
  • In hkey_current_user\software\local appwizard-generated applications\{malware file name}
    • recent file list
  • In hkey_current_user\software\local appwizard-generated applications\{malware file name}
    • settings
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Security Center
    • Svc
  • In HKEY_CURRENT_USER\Software
    • bisoft

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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Security Center\Svc
    • EnableLUA = "16"
  • In HKEY_CURRENT_USER\Software\bisoft
    • frstrunn = "1"

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.
  • %User Profile%\Application Data\drivers
  • %User Profile%\downld\

Step 5

Scan your computer with your Trend Micro product to delete files detected as WORM_BAGLE.SMA. 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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