WORM_GAMAURE.SM


 ALIASES:

VirTool:Win32/Obfuscator.AGA (Microsoft); PWS-FAVD!2CDEA2E773C3 (McAfee); W32.Virut.CF (Symantec); Virus.Win32.Virut.ce.6 (v) (Sunbelt); Trojan horse SHeur4.BFTJ (AVG)

 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:

562,176 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

15 May 2013

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:

  • %User Temp%\03.tmp

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

It creates the following folders:

  • %User Temp%\_install_

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

Other System Modifications

This worm deletes the following files:

  • %User Temp%\03.tmp
  • %User Temp%\_INSTA~1\msiexec.exe
  • %User Temp%\09.tmp
  • %User Temp%\0B.tmp
  • %User Temp%\0D.tmp

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

It adds the following registry keys:

HKEY_LOCAL_MACHINE\software\microsoft\
windows\currentversion\Policies\
Explorer\Run

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft
00E35EEE = "{random values}"

HKEY_CURRENT_USER\Software
ImageBase = "{random values}"

HKEY_CURRENT_USER\Software
IMAGE_FILE_HEADER = "{random values}"

HKEY_CURRENT_USER\Software
DOS_STUB = "{random values}"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
ShowSuperHidden = "0"

It modifies the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
Hidden = "2"

(Note: The default value data of the said registry entry is 2.)

Dropping Routine

This worm drops the following files:

  • %User Temp%\_install_\msiexec.exe

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

Other Details

This worm connects to the following possibly malicious URL:

  • http://pe.{BLOCKED}cocklameavindustry.in/kbyolczpmdaqnebrofcspgdtqheurihh
  • http://sc.{BLOCKED}cocklameavindustry.in/tttqnkhocpmgdhrrorroroldhkeelisj
  • http://img.{BLOCKED}cocklameavindustry.in/qnheehebllliiffczzcffcfiijggjgst

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.300

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_LOCAL_MACHINE\software\microsoft\windows\currentversion\Policies\Explorer
    • Run

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
    • 00E35EEE = "{random values}"
  • In HKEY_CURRENT_USER\Software
    • ImageBase = "{random values}"
  • In HKEY_CURRENT_USER\Software
    • IMAGE_FILE_HEADER = "{random values}"
  • In HKEY_CURRENT_USER\Software
    • DOS_STUB = "{random values}"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
    • ShowSuperHidden = "0"

Step 4

Restore these modified registry values

[ Learn More ]

Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.

  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
    • From: Hidden = "2"
      To: Hidden = ""2""

Step 5

Search and delete this file

[ Learn More ]
There may be some 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.
  • %User Temp%\_install_\msiexec.exe

Step 6

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.
  • %User Temp%\_install_

Step 7

Scan your computer with your Trend Micro product to delete files detected as WORM_GAMAURE.SM. 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 8

Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.

  • %User Temp%\03.tmp
  • %User Temp%\_INSTA~1\msiexec.exe
  • %User Temp%\09.tmp
  • %User Temp%\0B.tmp
  • %User Temp%\0D.tmp


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