Analysis by: Michael Cabel
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • 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.

It performs denial of service (DoS) attacks on affected systems using specific flooding method(s).

  TECHNICAL DETAILS

File Size: 189,440 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 15 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%\drivers\svflooje.exe

(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)

It drops the following non-malicious file:

  • %Windows%\keys.ini

(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)

Autostart Technique

This Trojan registers itself as a system service to ensure its automatic execution at every system startup by adding the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\svflooje
Type = 110

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\svflooje
Start = 2

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\svflooje
ErrorControl = 1

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\svflooje
ImagePath = %System%\drivers\svflooje.exe

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\svflooje
DisplayName = "svflooje"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\svflooje
ObjectName = "LocalSystem"

Denial of Service (DoS) Attack

This Trojan performs denial of service (DoS) attacks on affected systems using the following flooding method(s):

  • HTTP Flood

NOTES:

This Trojan uses the following referrers in performing the Denial-of-Service attack:

  • http://afisha.ru
  • http://altavista.com
  • http://anekdot.ru
  • http://download.ru
  • http://fomenko.ru
  • http://gazeta.ru
  • http://gismeteo.ru
  • http://google.com
  • http://job.ru
  • http://lenta.ru
  • http://lib.ru
  • http://mail.com
  • http://mail.ru
  • http://rambler.ru
  • http://rbc.ru
  • http://referat.ru
  • http://rol.ru
  • http://subscribe.ru
  • http://yahoo.com
  • http://yandex.ru

It also uses the following user-agents in performing the attack:

  • Microsoft Internet Explorer/4.0b1 (Windows 95)
  • Mozilla/1.22 (compatible; MSIE 1.5; Windows NT)
  • Mozilla/1.22 (compatible; MSIE 2.0; Windows 95)
  • Mozilla/2.0 (compatible; MSIE 3.01; Windows 98)
  • Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)
  • Mozilla/4.0 (compatible; MSIE 5.0; Mac_PowerPC) Opera 6.0 [en]
  • Mozilla/4.0 (compatible; MSIE 5.0; SunOS 5.9 sun4u; X11)
  • Mozilla/4.0 (compatible; MSIE 5.0; Windows 2000) Opera 6.03 [en]
  • Mozilla/4.0 (compatible; MSIE 5.17; Mac_PowerPC)
  • Mozilla/4.0 (compatible; MSIE 5.23; Mac_PowerPC)
  • Mozilla/4.0 (compatible; MSIE 5.5; Windows NT 5.0)
  • Mozilla/4.0 (compatible; MSIE 6.0; ; Linux armv5tejl; U) Opera 8.02 [en_US] Maemo browser 0.4.31 N770/SU-18
  • Mozilla/4.0 (compatible; MSIE 6.0; MSN 2.5; Windows 98)
  • Mozilla/4.0 (compatible; MSIE 6.0; Nitro) Opera 8.50 [de]
  • Mozilla/4.0 (compatible; MSIE 6.0; Nitro) Opera 8.50 [en]
  • Mozilla/4.0 (compatible; MSIE 6.0; Nitro) Opera 8.50 [es-es]
  • Mozilla/4.0 (compatible; MSIE 6.0; Nitro) Opera 8.50 [fr]
  • Mozilla/4.0 (compatible; MSIE 6.0; Nitro) Opera 8.50 [it]
  • Mozilla/4.0 (compatible; MSIE 6.0; Nitro) Opera 8.50 [ja]
  • Mozilla/4.0 (compatible; MSIE 6.0; Symbian OS; Nokia 6600/5.27.0; 1657) Opera 8.60 [ru]
  • Mozilla/4.0 (compatible; MSIE 6.0; Symbian OS; Nokia 6600/5.27.0; 1665) Opera 8.60 [ru]
  • Mozilla/4.0 (compatible; MSIE 6.0; Symbian OS; Nokia 6600/5.27.0; 6329) Opera 8.00 [ru]
  • Mozilla/4.0 (compatible; MSIE 6.0; Symbian OS; Nokia 6600/5.27.0; 6936) Opera 8.50 [ru]
  • Mozilla/4.0 (compatible; MSIE 6.0; Symbian OS; Nokia 6600/5.27.0; 9399) Opera 8.65 [ru]
  • Mozilla/4.0 (compatible; MSIE 6.0; Symbian OS; Nokia 6600/5.27.0; 9424) Opera 8.65 [ru]
  • Mozilla/4.0 (compatible; MSIE 6.0; Symbian OS; Nokia 6630/4.03.38; 6937) Opera 8.50 [es]
  • Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; en) Opera 8.50
  • Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)
  • Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.0.3705; .NET CLR 1.1.4322; Media Center PC 4.0; .NET CLR 2.0.50727)
  • Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322)
  • Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727)
  • Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; SV1; .NET CLR 1.1.4322)
  • Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; SV1; Arcor 5.005; .NET CLR 1.0.3705; .NET CLR 1.1.4322)
  • mozilla/4.0 (compatible; msie 7.0; windows nt 5.1; trident/4.0; ...)
  • Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; YPC 3.0.1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)
  • Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0)
  • Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0; WOW64; SLCC1; .NET CLR 2.0.50727; .NET CLR 3.0.04506; .NET CLR 3.5.21022)
  • Mozilla/4.0 (compatible; MSIE 7.0b; Win32)
  • Mozilla/4.0 (compatible; MSIE 7.0b; Windows NT 5.1)
  • Mozilla/4.0 (compatible; MSIE 7.0b; Windows NT 6.0)
  • mozilla/4.0 (compatible; msie 8.0; windows nt 5.1; trident/4.0; ...)
  • Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0; WOW64; SLCC1; .NET CLR 2.0.50727; .NET CLR 3.0.04506; .NET CLR 3.5.21022)
  • Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0; WOW64; Trident/4.0; SLCC1; .NET CLR 2.0.50727; .NET CLR 3.5.21022; .NET CLR 3.5.30729; .NET CLR 3.0.30618)
  • Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0)
  • Mozilla/4.1 (compatible; MSIE 5.0; Symbian OS; Nokia 6600;452) Opera 6.20 [ru]
  • Mozilla/5.0 (Macintosh; U; Intel Mac OS X; en-US; rv:1.8.0.7) Gecko/20060909 Firefox/1.5.0.7
  • Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; en-US; rv:1.7.12) Gecko/20050915 Firefox/1.0.7
  • Mozilla/5.0 (Windows NT 5.1; U; en) Opera 8.50
  • Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.3a) Gecko/20030105 Phoenix/0.5
  • Mozilla/5.0 (Windows; U; Windows NT 5.1; en-GB; rv:1.8.0.1) Gecko/20060111 Firefox/1.5.0.1
  • Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US) AppleWebKit/525.13 (KHTML, like Gecko) Chrome/0.2.149.27 Safari/525.13
  • Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US)
  • Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US) AppleWebKit/525.19 (KHTML, like Gecko) Chrome/0.4.154.25 Safari/525.19
  • Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.6b) Gecko/20031215 Firebird/0.7+
  • Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.10) Gecko/20050716 Firefox/1.0.6
  • Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.0.4) Gecko/20060516 SeaMonkey/1.0.2
  • Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.0.6) Gecko/20060728 SeaMonkey/1.0.4
  • Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.1) Gecko/20061204 Firefox/2.0.0.1
  • Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1) Gecko/20090624 Firefox/3.5
  • Mozilla/5.0 (Windows; U; Windows NT 5.1; nl-NL; rv:1.7.5) Gecko/20041202 Firefox/1.0
  • Mozilla/5.0 (Windows; U; Windows NT 5.1; nl; rv:1.8) Gecko/20051107 Firefox/1.5
  • Mozilla/5.0 (Windows; U; Windows NT 5.1; ru; rv:1.8.1.17) Gecko/20080829 Firefox/2.0.0.17
  • Mozilla/5.0 (Windows; U; Windows NT 5.1; ru; rv:1.8.1.19) Gecko/20081201 Firefox/2.0.0.19
  • Mozilla/5.0 (Windows; U; Windows NT 5.1; ru; rv:1.8.1.20) Gecko/20081217 Firefox/2.0.0.20
  • Mozilla/5.0 (Windows; U; Windows NT 5.1; ru; rv:1.8.1.9) Gecko/20071025 Firefox/2.0.0.9
  • Mozilla/5.0 (Windows; U; Windows NT 5.1; ru; rv:1.9) Gecko/2008052906 Firefox/3.0
  • Mozilla/5.0 (Windows; U; Windows NT 5.1; ru; rv:1.9.0.1) Gecko/2008070208 Firefox/3.0.1
  • Mozilla/5.0 (Windows; U; Windows NT 5.1; ru; rv:1.9.0.2) Gecko/2008091620 Firefox/3.0.2
  • Mozilla/5.0 (Windows; U; Windows NT 5.1; ru; rv:1.9.0.3) Gecko/2008092417 Firefox/3.0.3
  • Mozilla/5.0 (Windows; U; Windows NT 5.1; ru; rv:1.9.0.3) Gecko/2008092417 Firefox/3.0.3 (.NET CLR 3.5.30729)
  • Mozilla/5.0 (Windows; U; Windows NT 5.1; ru; rv:1.9.0.7) Gecko/2009021910 Firefox/3.0.7
  • Mozilla/5.0 (Windows; U; Windows NT 5.2; ru; rv:1.9.0.5) Gecko/2008120122 Firefox/3.0.5
  • Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.8.0.4) Gecko/20060508 Firefox/1.5.0.4
  • Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.0.10) Gecko/2009042316 Firefox/3.0.10
  • Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.1.1) Gecko/20090715 Firefox/3.5.1
  • Mozilla/5.0 (Windows; U; Windows NT 6.0; ru; rv:1.9.0.3) Gecko/2008092417 Firefox/3.0.3
  • Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/525.19 (KHTML, like Gecko) Chrome/1.0.154.65 Safari/525.19
  • Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/532.5 (KHTML, like Gecko) Chrome/4.0.249.89 Safari/532.5
  • Mozilla/5.0 (X11; U; FreeBSD i386; en-US; rv:1.7.8) Gecko/20050609 Firefox/1.0.4
  • Mozilla/5.0 (X11; U; Linux i686 (x86_64); en-US; rv:1.8.1.9) Gecko/20071025 Firefox/2.0.0.9
  • Mozilla/5.0 (X11; U; Linux i686 (x86_64); en-US; rv:1.9a1) Gecko/20061204 GranParadiso/3.0a1
  • Mozilla/5.0 (X11; U; Linux i686; en-US) AppleWebKit/532.9 (KHTML, like Gecko) Chrome/5.0.307.9 Safari/532.9
  • Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.9) Gecko/20050711 Firefox/1.0.5
  • Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.0.2) Gecko/20060308 Firefox/1.5.0.2
  • Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.0.3) Gecko/20060426 Firefox/1.5.0.3
  • Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.0.6) Gecko/20060808 Fedora/1.5.0.6-2.fc5 Firefox/1.5.0.6 pango-text
  • Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.2) Gecko/20070220 Firefox/2.0.0.2
  • Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.2) Gecko/20070221 SUSE/2.0.0.2-6.1 Firefox/2.0.0.2
  • Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.8.1) Gecko/20060601 Firefox/2.0 (Ubuntu-edgy)
  • Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.1) Gecko/20090716 Ubuntu/9.04 (jaunty) Shiretoko/3.5.1
  • Mozilla/5.0 (X11; U; Linux x86_64; ru; rv:1.9.0.2) Gecko/2008092702 Gentoo Firefox/3.0.2
  • Mozilla/5.0 (X11; U; Linux x86_64; ru; rv:1.9.1.1) Gecko/20090730 Gentoo Firefox/3.5.1
  • Opera/10.00 (Windows NT 6.0; U; en) Presto/2.2.0
  • Opera/7.23 (Windows 98; U) [en]
  • Opera/8.0 (X11; Linux i686; U; cs)
  • Opera/8.51 (Windows NT 5.1; U; en)
  • Opera/9.0 (Windows NT 5.1; U; en)
  • Opera/9.00 (Nintendo Wii; U; ; 1309-9; en)
  • Opera/9.00 (Wii; U; ; 1038-58; Wii Shop Channel/1.0; en)
  • Opera/9.01 (X11; Linux i686; U; en)
  • Opera/9.02 (Windows NT 5.1; U; en)
  • Opera/9.10 (Windows NT 5.1; U; en)
  • Opera/9.23 (Windows NT 5.1; U; ru)
  • Opera/9.50 (Windows NT 5.1; U; ru)
  • Opera/9.50 (Windows NT 6.0; U; en)
  • Opera/9.60 (Windows NT 5.1; U; en) Presto/2.1.1
  • Opera/9.80 (Windows NT 5.1; U; en) Presto/2.5.18 Version/10.50
  • Opera/9.80 (Windows NT 5.1; U; ru) Presto/2.2.15 Version/10.20
  • Opera/9.80 (Windows NT 6.1; U; ru) Presto/2.2.15 Version/10.00
  • Opera/9.80 (X11; Linux x86_64; U; en) Presto/2.2.15 Version/10.10

  SOLUTION

Minimum Scan Engine: 9.200
FIRST VSAPI PATTERN FILE: 8.662.01
FIRST VSAPI PATTERN DATE: 23 Dec 2011

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

Restart in Safe Mode

[ Learn More ]

Step 3

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\SYSTEM\CurrentControlSet\Services
    • svflooje

Step 4

Search and delete this file

[ Learn More ]
There may be some component 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. %Windows%\keys.ini

Step 5

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


Did this description help? Tell us how we did.