TROJ_DDOS.SM
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)
Windows 2000, Windows XP, Windows Server 2003
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
41,472 bytes
EXE
No
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
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
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
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
Step 5
Search and delete this file
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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