TROJ_DDOS.SM


 ALIASES:

Backdoor:Win32/Jukbot.B (Microsoft); Downloader-CFZ (McAfee); Downloader (Symantec); Trojan-DDoS.Win32.Agent.ef (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan.Generic.1726547 (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:

41,472 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

29 Dec 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 drops the following copies of itself into the affected system:

  • %System%\{malware file name}.exe

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)

It creates the following folders:

  • %Application Data%\Microsoft\Internet Explorer

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

Other System Modifications

This Trojan adds the following registry keys:

HKEY_CURRENT_USER\Software\Microsoft\
IEAK

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Storm ddos soft free
Description = "Thank you"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Connection Wizard
ShellNext = "http://www.{BLOCKED}oft.com/isapi/redir.dll?prd=ie&clcid=0x0409&pver=6.0&ar=home"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Connection Wizard
Completed = {random values}

Dropping Routine

This Trojan drops the following files:

  • %System%\Stormser.dll

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)

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\Microsoft
    • IEAK

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\SYSTEM\ControlSet001\Services\Storm ddos soft free
    • Description="Thank you"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Connection Wizard
    • ShellNext="http://www.{BLOCKED}oft.com/isapi/redir.dll?prd=ie&clcid=0x0409&pver=6.0&ar=home"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Connection Wizard
    • Completed={random values}

Step 4

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. %Application Data%\Microsoft\Internet Explorer

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. %System%\Stormser.dll

Step 6

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


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