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TROJ_SRIZBI.BY

October 08, 2012
 Analysis by: Christopher Daniel So
 ALIASES:

Trojan:Win32/Ragterneb.A (Microsoft), Trojan.Srizbi (Symantec), Trojan.Win32.Vilsel.awxc (Kaspersky), Mal/Ratti-A (Sophos)

 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 adds certain registry entries to disable the Task Manager. This action prevents users from terminating the malware process, which can usually be done via the Task Manager.

  TECHNICAL DETAILS

File Size:

139,264 bytes

File Type:

PE

Memory Resident:

Yes

Initial Samples Received Date:

28 Dec 2010

Installation

This Trojan drops the following files:

  • %Current Folder%\userid.dat

Autostart Technique

This Trojan adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
mscj = "{malware path and file name}"

Other System Modifications

This Trojan adds the following registry entries to disable the Task Manager:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
System
DisableTaskMgr = 1

Download Routine

This Trojan accesses the following websites to download files:

  • http://1.images.{BLOCKED}ost1.com/tps/thumbs/{random folder 1}/{random folder 2}/{random characters}.jpg
  • http://{BLOCKED}6.{BLOCKED}0.167.37/{BLOCKED}ovideo.com/{random characters}.jpg
  • http://{BLOCKED}9.{BLOCKED}5.10.99/st/thumbs/{random folder name}/{random characters}.jpg
  • http://{BLOCKED}4.{BLOCKED}6.167.150/nitro/teens/{random characters}.jpg
  • http://{BLOCKED}4.{BLOCKED}6.167.152/nitro/mix/{random characters}.jpg
  • http://{BLOCKED}4.{BLOCKED}6.167.152/nitro/teens/{random characters}.jpg
  • http://{BLOCKED}4.{BLOCKED}6.167.154/nitro/mix/{random characters}.jpg
  • http://{BLOCKED}4.{BLOCKED}6.167.156/nitro/mix/{random characters}.jpg
  • http://8.images.{BLOCKED}ost1.com/tps/thumbs/008/240x180/{random characters}.jpg
  • http://9.images.{BLOCKED}st1.com/tps/thumbs/009/240x180/{random characters}.jpg
  • http://{BLOCKED}9.{BLOCKED}2.165.53/nitro/teens/{random characters}.jpg
  • http://{BLOCKED}xclips.com/ftt2/check.php?{random characters}
  • http://{BLOCKED}xclips.com/ftt2/toplists/img/{random characters}.jpg
  • http://{BLOCKED}-vids.com/ban/{random characters}.gif
  • http://{BLOCKED}ro-{BLOCKED}ising.com/datanew/thumbs/{random folder}/{random characters}.jpg
  • http://{BLOCKED}xshow.com/{random characters}
  • http://{BLOCKED}orn.com/streamrotator/thumbs/c/{random characters}.jpg
  • http://i.{BLOCKED}36.com/sr/thumbs/{random folder}/{random characters}.jpg
  • http://{BLOCKED}2.vidz.com/thumbs/{random characters}.jpg
  • http://img.{BLOCKED}xshow.com/newgalls/th3/{random characters}.jpg
  • http://img.{BLOCKED}xshow.com/th1/{random characters}.jpg
  • http://img.{BLOCKED}rn-video.com/A/{random characters}.jpg
  • http://img1.{BLOCKED}xclips.com/st/thumbs/{random folder}/{random characters}.jpg
  • http://{BLOCKED}00.{BLOCKED}s.com/videos/thumbslll/{random characters}.jpg
  • http://{BLOCKED}2.{BLOCKED}xclips.com/st/thumbs/{random folder}/{random characters}.jpg
  • http://{BLOCKED}oo.com/thumb/{random characters}.jpg
  • http://{BLOCKED}sgall.com/images/{random characters}.jpg
  • http://{BLOCKED}sgall.com/newcj/out.php
  • http://{BLOCKED}sgall.com/{random characters}.jpg
  • http://{BLOCKED}vies.com/cj_out.php?{random characters}
  • http://{BLOCKED}vies.com/thumb/{random characters}
  • http://{BLOCKED}bmovies.net//cgi-bin/at3/out.cgi?{random characters}
  • http://{BLOCKED}bmovies.net/streamrotator/out.php?{random characters}
  • http://{BLOCKED}bmovies.net/streamrotator/thumbs/{random folder}/{random characters}.jpg
  • http://{BLOCKED}teronline.in/?aid=244&si=726050&rd=20101229095920&{random characters}
  • http://s10.{BLOCKED}ts.com/js9.js
  • http://s4.{BLOCKED}ts.com/stats/0.php?312801&@f16&@g1&@h1&@i1&@j1293588537640&@k0&@l1&@mTeens%20Juice%20Movies%20Udated%20Daily&@n0&@o1000&@q0&@r0&@s0&@ten-us&@u1123&@vhttp%3A%2F%2Fwww.{BLOCKED}juice.com%2Findex1.shtml&@w
  • http://s4.{BLOCKED}ts.com/stats/e.php?312801&@Ab&@R30852&@w
  • http://{BLOCKED}ic.{BLOCKED}os.com/{random characters}
  • http://{BLOCKED}eteenies.com/cgi-bin/at3/out.cgi?id=164&l=toplist2&880&trade=http://zoo-sex-porn.com/
  • http://{BLOCKED}eteenies.com/st/stt.php?aid=244&from=cnhjb3VudGVyb25saW5lLmlu&32075
  • http://{BLOCKED}ealthy-place.com/tds/in.cgi?9
  • http://{BLOCKED}ro.biz/{random characters}
  • http://{BLOCKED}unts.com/cgi-bin/at3/out.cgi?{random characters}
  • http://{BLOCKED}unts.com/st/stt.php?{random characters}
  • http://{BLOCKED}ma.com/cgi-bin/at3/out.cgi?{random characters}
  • http://{BLOCKED}ma.com/st/stt.php?{random characters}
  • http://{BLOCKED}-design.net/ts/in.cgi?asfalt
  • http://video.{BLOCKED}vs.com/video678880/0/video_store_incident
  • http://www.{BLOCKED}eo.com/seo.php?username=Lelik
  • http://www.{BLOCKED}36.com/{random characters}
  • http://www.{BLOCKED}esex.com/{random characters}
  • http://www.{BLOCKED}-vids.com/ban/{random characters}.gif
  • http://www.{BLOCKED}hthot.com/images/{random characters}.gif
  • http://www.{BLOCKED}nthumbs.com/buttons/new-button-4.gif
  • http://www.{BLOCKED}sex365.com/galleries/dog/7fw/{random characters}.jpg
  • http://www.{BLOCKED}movs.com/out.php?urls=http://video.milfmovs.com/video678880/0/video_store_incident
  • http://www.{BLOCKED}nvids.com/niches/{random characters}.php
  • http://www.{BLOCKED}ovideo.com/{random characters}
  • http://www.{BLOCKED}ktubes.com/{random characters}
  • http://www.{BLOCKED}avids.com/images/{random characters}.jpg
  • http://www.{BLOCKED}vids.com/streamrotator/thumbs/a/{random characters}.jpg
  • http://www.{BLOCKED}wn.com/65/nua.php
  • http://www.{BLOCKED}ill.com/{random characters}
  • http://www.{BLOCKED}ice.com/{random characters}
  • http://www.{BLOCKED}older.com/in/in.php?agent1510
  • http://www.{BLOCKED}be.tv/wtf/{random characters}.jpg
  • http://www.{BLOCKED}vs.com/{random characters}
  • http://{BLOCKED}yhole.com/{random characters}
  • http://{BLOCKED}tic.com/ydd/images/{random characters}.jpg
  • http://{BLOCKED}-video.com/free/{random characters}/index.html
  • http://{BLOCKED}orn.com/cj_out.php?thumb={random characters}.jpg&url=http://galls.forbiddenmovs.in/{random characters}.html
  • http://{BLOCKED}orn.com/thumb/{random characters}.jpg
  • http://{BLOCKED}ils.com/images/{random characters}.gif

  SOLUTION

Minimum Scan Engine:

8.900

VSAPI PATTERN File:

7.732.04

VSAPI PATTERN Date:

28 Dec 2010

VSAPI PATTERN Date:

12/28/2010 12:00:00 AM

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 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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • mscj={malware path and file name}
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System
    • DisableTaskMgr=1

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. %Current Folder%\userid.dat

Step 5

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