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TROJ_DLOADE.BKK

January 02, 2013
 ALIASES:

TrojanDownloader:Win32/Horst.Q (Microsoft); Downloader-BOW (McAfee); Downloader.Trojan (Symantec); Trojan.Win32.Generic!BT (Sunbelt); Trojan.Horst.YF (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.

It disables Task Manager, Registry Editor, and Folder Options.

  TECHNICAL DETAILS

File Size:

81,920 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

31 Dec 2012

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\sessmgr.exe
  • %User Profile%\MICROS~1\rsvp.exe
  • %Windows%\cisvc.exe
  • %Application Data%\MICROS~1\ieudinit.exe

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.. %Windows% is the Windows folder, which is usually C:\Windows.. %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_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\Run

HKEY_USERS\.DEFAULT\Software\
Microsoft\Windows\CurrentVersion\
Policies\Explorer\Run

HKEY_CURRENT_USER\SOFTWARE\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\Run

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer\Run
SessMgr = "%System%\drivers\sessmgr.exe /waitservice"

It modifies the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows NT\CurrentVersion\Windows
load = "%Application Data%\MICROS~1\ieudinit.exe"

It creates the following registry entry(ies) to disable Task Manager, Registry Tools and Folder Options:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\Run
rsvp = "%User Profile%\MICROS~1\rsvp.exe /waitservice"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\Run
Cisvc = "%Windows%\cisvc.exe /waitservice"

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://www.{BLOCKED}us.com/img/gt.cgi?s=4038983573&r=jcab
  • http://www.{BLOCKED}test.com/img/gt.cgi?s=4038983573&r=jcab
  • http://www.{BLOCKED}nus.com/img/gt.cgi?s=4038983573&r=jcab
  • http://www1.{BLOCKED}us.com/img/gt.cgi?s=4038983573&r=jcab
  • http://www1.{BLOCKED}test.com/img/gt.cgi?s=4038983573&r=jcab
  • http://www1.{BLOCKED}nus.com/img/gt.cgi?s=4038983573&r=jcab
  • http://www2.{BLOCKED}us.com/img/gt.cgi?s=4038983573&r=jcab
  • http://www2.{BLOCKED}test.com/img/gt.cgi?s=4038983573&r=jcab
  • http://www2.{BLOCKED}nus.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwsu.{BLOCKED}us.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwcf.{BLOCKED}test.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwlk.{BLOCKED}nus.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwaa.{BLOCKED}us.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwaa.{BLOCKED}test.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwaa.{BLOCKED}nus.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwab.{BLOCKED}us.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwab.{BLOCKED}test.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwab.{BLOCKED}nus.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwac.{BLOCKED}us.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwac.{BLOCKED}test.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwac.{BLOCKED}nus.com/img/gt.cgi?s=4038983573&r=jcab
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  • http://wwwad.{BLOCKED}test.com/img/gt.cgi?s=4038983573&r=jcab
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  • http://wwwae.{BLOCKED}test.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwae.{BLOCKED}nus.com/img/gt.cgi?s=4038983573&r=jcab
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  • http://wwwaf.{BLOCKED}nus.com/img/gt.cgi?s=4038983573&r=jcab
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  • http://wwwah.{BLOCKED}test.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwah.{BLOCKED}nus.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwai.{BLOCKED}us.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwai.{BLOCKED}test.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwai.{BLOCKED}nus.com/img/gt.cgi?s=4038983573&r=jcab
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  • http://wwwaj.{BLOCKED}test.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwaj.{BLOCKED}nus.com/img/gt.cgi?s=4038983573&r=jcab
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  • http://wwwam.{BLOCKED}test.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwam.{BLOCKED}nus.com/img/gt.cgi?s=4038983573&r=jcab
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  • http://wwwao.{BLOCKED}us.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwao.{BLOCKED}test.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwao.{BLOCKED}nus.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwap.{BLOCKED}us.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwap.{BLOCKED}test.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwap.{BLOCKED}nus.com/img/gt.cgi?s=4038983573&r=jcab
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  • http://wwwat.{BLOCKED}test.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwat.{BLOCKED}nus.com/img/gt.cgi?s=4038983573&r=jcab
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  • http://wwwau.{BLOCKED}test.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwau.{BLOCKED}nus.com/img/gt.cgi?s=4038983573&r=jcab
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  • http://wwwav.{BLOCKED}test.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwav.{BLOCKED}nus.com/img/gt.cgi?s=4038983573&r=jcab
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  • http://wwwaw.{BLOCKED}test.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwaw.{BLOCKED}nus.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwax.{BLOCKED}us.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwax.{BLOCKED}test.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwax.{BLOCKED}nus.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwway.{BLOCKED}us.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwway.{BLOCKED}test.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwway.{BLOCKED}nus.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwaz.{BLOCKED}us.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwaz.{BLOCKED}test.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwaz.{BLOCKED}nus.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwba.{BLOCKED}us.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwba.{BLOCKED}test.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwba.{BLOCKED}nus.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbb.{BLOCKED}us.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbb.{BLOCKED}test.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbb.{BLOCKED}nus.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbc.{BLOCKED}us.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbc.{BLOCKED}test.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbc.{BLOCKED}nus.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbd.{BLOCKED}us.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbd.{BLOCKED}test.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbd.{BLOCKED}nus.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbe.{BLOCKED}us.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbe.{BLOCKED}test.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbe.{BLOCKED}nus.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbf.{BLOCKED}us.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbf.{BLOCKED}test.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbf.{BLOCKED}nus.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbg.{BLOCKED}us.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbg.{BLOCKED}test.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbg.{BLOCKED}nus.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbh.{BLOCKED}us.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbh.{BLOCKED}test.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbh.{BLOCKED}nus.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbi.{BLOCKED}us.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbi.{BLOCKED}test.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbi.{BLOCKED}nus.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbj.{BLOCKED}us.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbj.{BLOCKED}test.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbj.{BLOCKED}nus.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbk.{BLOCKED}us.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbk.{BLOCKED}test.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbk.{BLOCKED}nus.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbl.{BLOCKED}us.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbl.{BLOCKED}test.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbl.{BLOCKED}nus.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbm.{BLOCKED}us.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbm.{BLOCKED}test.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbm.{BLOCKED}nus.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbn.{BLOCKED}us.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbn.{BLOCKED}test.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbn.{BLOCKED}nus.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbo.{BLOCKED}us.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbo.{BLOCKED}test.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbo.{BLOCKED}nus.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbp.{BLOCKED}us.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbp.{BLOCKED}test.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbp.{BLOCKED}nus.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbq.{BLOCKED}us.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbq.{BLOCKED}test.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbq.{BLOCKED}nus.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbr.{BLOCKED}us.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbr.{BLOCKED}test.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbr.{BLOCKED}nus.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbs.{BLOCKED}us.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbs.{BLOCKED}test.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbs.{BLOCKED}nus.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbt.{BLOCKED}us.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbt.{BLOCKED}test.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbt.{BLOCKED}nus.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbu.{BLOCKED}us.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbu.{BLOCKED}test.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbu.{BLOCKED}nus.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbv.{BLOCKED}us.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbv.{BLOCKED}test.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbv.{BLOCKED}nus.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbw.{BLOCKED}us.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbw.{BLOCKED}test.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbw.{BLOCKED}nus.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbx.{BLOCKED}us.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbx.{BLOCKED}test.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbx.{BLOCKED}nus.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwby.{BLOCKED}us.com/img/gt.cgi?s=4038983573&r=jcab
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  • http://wwwby.{BLOCKED}nus.com/img/gt.cgi?s=4038983573&r=jcab
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  • http://wwwbz.{BLOCKED}test.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwbz.{BLOCKED}nus.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwca.{BLOCKED}us.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwca.{BLOCKED}test.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwca.{BLOCKED}nus.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwcb.{BLOCKED}us.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwcb.{BLOCKED}test.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwcb.{BLOCKED}nus.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwcc.{BLOCKED}us.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwcc.{BLOCKED}test.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwcc.{BLOCKED}nus.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwcd.{BLOCKED}us.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwcd.{BLOCKED}test.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwcd.{BLOCKED}nus.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwce.{BLOCKED}us.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwce.{BLOCKED}test.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwce.{BLOCKED}nus.com/img/gt.cgi?s=4038983573&r=jcab
  • http://wwwcf.{BLOCKED}us.com/img/gt.cgi?s=4038983573&r=jcab
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  • http://wwwci.{BLOCKED}us.com/img/gt.cgi?s=4038983573&r=jcab
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This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.300

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

Enable Registry Editor, Task Manager, and Folder options

[ Learn More ]
By doing this step, you also enable other applications/programs disabled by this malware/grayware/spyware.

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\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer
    • Run
  • In HKEY_USERS\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer
    • Run
  • In HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer
    • Run

Step 4

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\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\Run
    • SessMgr = "%System%\drivers\sessmgr.exe /waitservice"

Step 5

Restore these modified registry values

[ Learn More ]

Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.

  • In HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Windows
    • load = "%Application Data%\MICROS~1\ieudinit.exe"

Step 6

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