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WORM_EBOOM.AC

October 09, 2012
 Analysis by: Cris Nowell Pantanilla
 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

Infection Channel:

Downloaded from the Internet, Propagates via social networking sites


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:

195,072 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

11 May 2012

Payload:

Connects to URLs/IPs

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 injects codes into the following process(es):

  • IEXPLORE
  • chrome
  • firefox
  • iexplore
  • opera

Download Routine

This worm accesses the following websites to download files:

  • http://www.{BLOCKED}arding.com/4721605860.txt

NOTES:

This worm terminates and deletes itself when the following conditions are met:

  • If file name contains any of the following string:
    • malware
    • sample
    • sand-box
    • sandbox
    • test
    • virus
  • If computer name of the affected system is any of the following:
    • DELL-D3E62F7E26
    • HOME-OFF-D5F0AC
    • KAKAPROU-6405DA
    • MAKKK
    • Malekal
    • VMG-CLIENT
  • If user names found on the affected system are any of the following:
    • DELL-D3E62F7E26
    • HOME-OFF-D5F0AC
    • KAKAPROU-6405DA
    • klasnich
    • Mak
    • Malekal
    • VMG-CLIENT

This worm enumerates entries from the following registry and check for the following virtual environment:

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum
VMware
VBox
Virtual
QEMU

It checks if it running in a virtual environment by checking if any of the following files are running in memory:

  • cports.exe
  • dumpcap.exe
  • filemon.exe
  • procdump.exe
  • procexp.exe
  • procmon.exe
  • regmon.exe
  • regshot.exe
  • sbiectrl.exe
  • squid.exe
  • syssafe.exe
  • tcpview
  • vbox
  • vmsrvc
  • vmware
  • wireshark.exe

It also checks if opened windows or classes contain any of the following:

  • CurrPorts*
  • Microsoft Network Monitor 3.3
  • Process Monitor - Sysinternals: www.sysinternals.com
  • PROCEXPL
  • Regshot 1.8.2
  • SmartSniff
  • TCPViewClass
  • The Wireshark Network Analyzer

It also checks if the following files exist:

  • %Program Files%\Ethereal\ethereal.html
  • %Program Files%\Microsoft Network Monitor 3\netmon.exe
  • %Program Files%\WinPcap\rpcapd.exe
  • %Program Files%\WireShark\rawshark.exe

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

This worm monitors users' browsing activities such as message posting, deleting posted messages and private messages sent on the following websites:

  • Facebook
  • Meebo
  • MySpace
  • Twitter
  • WordPress

It may spread by posting messages in the aforementioned sites. The messages posted may contain a URL that leads to its copy.

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

8.988.02

FIRST VSAPI PATTERN DATE:

11 May 2012

VSAPI OPR PATTERN File:

8.989.00

VSAPI OPR PATTERN Date:

11 May 2012

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

Scan your computer with your Trend Micro product and note files detected as WORM_EBOOM.AC

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

Search and delete the file detected as WORM_EBOOM.AC

[ Learn More ]

Step 5

Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_EBOOM.AC. 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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