BKDR_BOTGOR.SML

June 30, 2013

ALIASES:

Backdoor:Win32/Botgor.B (Microsoft); BackDoor-DSE (McAfee); Trojan.Gen (Symantec); Worm.Win32.Burn.b (Kaspersky); BehavesLike.Win32.Malware.ssc (mx-v) (Sunbelt); Win32.Backdoor.Agent.A (FSecure)

PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

OVERALL RISK RATING:

DAMAGE POTENTIAL:

DISTRIBUTION POTENTIAL:

REPORTED INFECTION:

Threat Type: Backdoor
Destructiveness: No
Encrypted:
In the wild: Yes

OVERVIEW

This backdoor 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:

373,768 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

23 Aug 2012

Arrival Details

This backdoor 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 backdoor drops the following copies of itself into the affected system:

%System%\bot1.exe
%User Temp%\bot2.tmp

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.. %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)

Autostart Technique

This backdoor modifies the following registry entries to ensure it automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
Userinit = "%System%\userinit.exe,%System%\bot1.exe,"

(Note: The default value data of the said registry entry is %Windows%\system32\userinit.exe,.)

Other System Modifications

This backdoor modifies the following file(s):

%System%\calc.exe
%System%\notepad.exe
%System%\mspaint.exe
%System%\sndrec32.exe
%System%\taskmgr.exe
%System%\spider.exe
%System%\sol.exe
%System%\dxdiag.exe
%System%\cleanmgr.exe
%Program Files%\common files\microsoft shared\msinfo\msinfo32.exe
%Program Files%\common files\microsoft shared\speech\sapisvr.exe
%Program Files%\internet explorer\connection wizard\icwconn1.exe
%Program Files%\internet explorer\connection wizard\icwconn2.exe
%Program Files%\internet explorer\connection wizard\icwrmind.exe
%Program Files%\internet explorer\connection wizard\icwtutor.exe
%Program Files%\internet explorer\connection wizard\inetwiz.exe
%Program Files%\internet explorer\connection wizard\isignup.exe
%Program Files%\internet explorer\iedw.exe
%Program Files%\internet explorer\iexplore.exe
%Program Files%\movie maker\moviemk.exe
%Program Files%\msn\msncorefiles\install\msn9components\digcore.exe
%Program Files%\msn\msncorefiles\install\msnsusii.exe
%Program Files%\msn gaming zone\windows\bckgzm.exe
%Program Files%\msn gaming zone\windows\chkrzm.exe
%Program Files%\msn gaming zone\windows\hrtzzm.exe
%Program Files%\msn gaming zone\windows\rvsezm.exe
%Program Files%\msn gaming zone\windows\shvlzm.exe
%Program Files%\msn gaming zone\windows\zclientm.exe
%Program Files%\netmeeting\conf.exe
%Program Files%\outlook express\msimn.exe
%Program Files%\outlook express\oemig50.exe
%Program Files%\outlook express\setup50.exe
%Program Files%\outlook express\wab.exe
%Program Files%\outlook express\wabmig.exe
%Program Files%\windows media player\migrate.exe
%Program Files%\windows media player\setup_wm.exe
%Program Files%\windows media player\wmplayer.exe
%Program Files%\windows nt\accessories\wordpad.exe
%Program Files%\windows nt\pinball\pinball.exe
%Program Files%\windows nt\dialer.exe
%Program Files%\windows nt\hypertrm.exe

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.. %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)

It deletes the following files:

%User Temp%\bot2.tmp
%User Temp%\bot3.tmp
%User Temp%\bot4.tmp
%User Temp%\bot7.tmp
%User Temp%\botA.tmp
%User Temp%\botD.tmp
%User Temp%\bot10.tmp
%User Temp%\bot13.tmp
%User Temp%\bot16.tmp
%User Temp%\bot19.tmp
%User Temp%\bot1C.tmp
%User Temp%\bot1F.tmp
%User Temp%\bot22.tmp
%User Temp%\bot25.tmp
%User Temp%\bot28.tmp
%User Temp%\bot2B.tmp
%User Temp%\bot2E.tmp
%User Temp%\bot31.tmp
%User Temp%\bot34.tmp
%User Temp%\bot37.tmp
%User Temp%\bot3A.tmp
%User Temp%\bot3D.tmp
%User Temp%\bot40.tmp
%User Temp%\bot43.tmp
%User Temp%\bot46.tmp
%User Temp%\bot49.tmp
%User Temp%\bot4C.tmp
%User Temp%\bot4F.tmp
%User Temp%\bot52.tmp
%User Temp%\bot55.tmp
%User Temp%\bot58.tmp
%User Temp%\bot5B.tmp
%User Temp%\bot5E.tmp
%User Temp%\bot61.tmp
%User Temp%\bot64.tmp
%User Temp%\bot67.tmp
%User Temp%\bot6A.tmp
%User Temp%\bot6D.tmp
%User Temp%\bot70.tmp
%User Temp%\bot73.tmp
%User Temp%\bot76.tmp
%User Temp%\bot79.tmp
%User Temp%\bot7C.tmp
%User Temp%\bot7F.tmp
%User Temp%\bot82.tmp

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

It adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\BN1

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\BN1
G = "144FC555-CC77-46A2-A5836DF03B99BC3C"

HKEY_LOCAL_MACHINE\SOFTWARE\BN1
AN = "Microsoft Internet Explorer"

HKEY_LOCAL_MACHINE\SOFTWARE\BN1
UA = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; MRA 4.8 (build 01709))"

Dropping Routine

This backdoor drops the following files:

%Program Files%\winpcap\rpcapd.exe
%Program Files%\winpcap\uninstall.exe
%User Temp%\bot3.tmp
%User Temp%\bot4.tmp
%User Temp%\bot7.tmp
%User Temp%\botA.tmp
%User Temp%\botD.tmp
%User Temp%\bot10.tmp
%User Temp%\bot13.tmp
%User Temp%\bot16.tmp
%User Temp%\bot19.tmp
%User Temp%\bot1C.tmp
%User Temp%\bot1F.tmp
%User Temp%\bot22.tmp
%User Temp%\bot25.tmp
%User Temp%\bot28.tmp
%User Temp%\bot2B.tmp
%User Temp%\bot2E.tmp
%User Temp%\bot31.tmp
%User Temp%\bot34.tmp
%User Temp%\bot37.tmp
%User Temp%\bot3A.tmp
%User Temp%\bot3D.tmp
%User Temp%\bot40.tmp
%User Temp%\bot43.tmp
%User Temp%\bot46.tmp
%User Temp%\bot49.tmp
%User Temp%\bot4C.tmp
%User Temp%\bot4F.tmp
%User Temp%\bot52.tmp
%User Temp%\bot55.tmp
%User Temp%\bot58.tmp
%User Temp%\bot5B.tmp
%User Temp%\bot5E.tmp
%User Temp%\bot61.tmp
%User Temp%\bot64.tmp
%User Temp%\bot67.tmp
%User Temp%\bot6A.tmp
%User Temp%\bot6D.tmp
%User Temp%\bot70.tmp
%User Temp%\bot73.tmp
%User Temp%\bot76.tmp
%User Temp%\bot79.tmp
%User Temp%\bot7C.tmp
%User Temp%\bot7F.tmp
%User Temp%\bot82.tmp

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).. %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)

Other Details

This backdoor connects to the following possibly malicious URL:

http://www.{BLOCKED}b.org/botnet1/bots_controller.php?{random characters}
http://www.{BLOCKED}oft.com

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

Identify and delete files detected as BKDR_BOTGOR.SML using either the Startup Disk or Recovery Console

[ Learn More ]

To identify and delete the malware/grayware file:

• On Windows XP and Server 2003 systems:

Scan your computer with your Trend Micro product and then take note of the names of the malware/grayware files detected.
Click Start>Run. In the Open input box, type secpol.msc and press Enter.
In the left panel, double-click Local Policies>Security Options.
In the right panel, double-click Recovery Console: Allow floppy copy and access to all drives and folders.
Select Enabled and click OK.
Insert the Windows Installation CD into the CD drive, then restart your computer.
When prompted, press any key to boot from the CD.
On the main menu, type r to go to the Recovery Console.
Type the number that corresponds to the drive and directory that contains Windows (usually C:\WINDOWS) and press Enter.
Type the Administrator password and press Enter.
In the input box, type the following then press Enter:
SET AllowAllPaths = TRUE
del "{malware/grayware path and file name}"
Type exit and press Enter to restart the system normally.

• On Windows Vista and 7 systems:

Scan your computer with your Trend Micro product and then take note of the names of the malware/grayware files detected.
Insert your Windows Installation DVD in the DVD drive, then Press the restart button.
When prompted, press any key to boot from the CD.
Depending on your Windows Installation DVD, you might be required to select the installation language. Then on the Install Windows window, choose your language, locale, and keyboard layout or input method. Click Next, then click Repair your computer.
Select Use recovery tools that can help fix problems starting Windows. Select your installation of Windows. Click Next.
If the Startup Repair window appears, click Cancel, Yes, then Finish.
In the System Recovery Options window, click Command Prompt.
In the Command Prompt window, type the following then press Enter:
BootRec.exe /fixmbr
del "{malware/grayware path and file name}"
Type exit and press Enter to close the Command Prompt window.
Click Restart to restart the system normally.

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
- BN1

Step 4

Delete this registry value

[ Learn More ]

In HKEY_LOCAL_MACHINE\SOFTWARE\BN1
- G = "144FC555-CC77-46A2-A5836DF03B99BC3C"

In HKEY_LOCAL_MACHINE\SOFTWARE\BN1
- AN = "Microsoft Internet Explorer"

In HKEY_LOCAL_MACHINE\SOFTWARE\BN1
- UA = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; MRA 4.8 (build 01709))"

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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
- From: Userinit = "%System%\userinit.exe,%System%\bot1.exe,"
  To: Userinit = ""%Windows%\system32\userinit.exe,""

Step 6

Search and delete these components

[ Learn More ]

There may be some components 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.

%Program Files%\winpcap\rpcapd.exe
%Program Files%\winpcap\uninstall.exe
%User Temp%\bot3.tmp
%User Temp%\bot4.tmp
%User Temp%\bot7.tmp
%User Temp%\botA.tmp
%User Temp%\botD.tmp
%User Temp%\bot10.tmp
%User Temp%\bot13.tmp
%User Temp%\bot16.tmp
%User Temp%\bot19.tmp
%User Temp%\bot1C.tmp
%User Temp%\bot1F.tmp
%User Temp%\bot22.tmp
%User Temp%\bot25.tmp
%User Temp%\bot28.tmp
%User Temp%\bot2B.tmp
%User Temp%\bot2E.tmp
%User Temp%\bot31.tmp
%User Temp%\bot34.tmp
%User Temp%\bot37.tmp
%User Temp%\bot3A.tmp
%User Temp%\bot3D.tmp
%User Temp%\bot40.tmp
%User Temp%\bot43.tmp
%User Temp%\bot46.tmp
%User Temp%\bot49.tmp
%User Temp%\bot4C.tmp
%User Temp%\bot4F.tmp
%User Temp%\bot52.tmp
%User Temp%\bot55.tmp
%User Temp%\bot58.tmp
%User Temp%\bot5B.tmp
%User Temp%\bot5E.tmp
%User Temp%\bot61.tmp
%User Temp%\bot64.tmp
%User Temp%\bot67.tmp
%User Temp%\bot6A.tmp
%User Temp%\bot6D.tmp
%User Temp%\bot70.tmp
%User Temp%\bot73.tmp
%User Temp%\bot76.tmp
%User Temp%\bot79.tmp
%User Temp%\bot7C.tmp
%User Temp%\bot7F.tmp
%User Temp%\bot82.tmp

To manually delete a malware/grayware component from an affected system:

• For Windows 2000, Windows XP, and Windows Server 2003:

Right-click Start then click Search....
In the Named input box, type:
%Program Files%\winpcap\rpcapd.exe
%Program Files%\winpcap\uninstall.exe
%User Temp%\bot3.tmp
%User Temp%\bot4.tmp
%User Temp%\bot7.tmp
%User Temp%\botA.tmp
%User Temp%\botD.tmp
%User Temp%\bot10.tmp
%User Temp%\bot13.tmp
%User Temp%\bot16.tmp
%User Temp%\bot19.tmp
%User Temp%\bot1C.tmp
%User Temp%\bot1F.tmp
%User Temp%\bot22.tmp
%User Temp%\bot25.tmp
%User Temp%\bot28.tmp
%User Temp%\bot2B.tmp
%User Temp%\bot2E.tmp
%User Temp%\bot31.tmp
%User Temp%\bot34.tmp
%User Temp%\bot37.tmp
%User Temp%\bot3A.tmp
%User Temp%\bot3D.tmp
%User Temp%\bot40.tmp
%User Temp%\bot43.tmp
%User Temp%\bot46.tmp
%User Temp%\bot49.tmp
%User Temp%\bot4C.tmp
%User Temp%\bot4F.tmp
%User Temp%\bot52.tmp
%User Temp%\bot55.tmp
%User Temp%\bot58.tmp
%User Temp%\bot5B.tmp
%User Temp%\bot5E.tmp
%User Temp%\bot61.tmp
%User Temp%\bot64.tmp
%User Temp%\bot67.tmp
%User Temp%\bot6A.tmp
%User Temp%\bot6D.tmp
%User Temp%\bot70.tmp
%User Temp%\bot73.tmp
%User Temp%\bot76.tmp
%User Temp%\bot79.tmp
%User Temp%\bot7C.tmp
%User Temp%\bot7F.tmp
%User Temp%\bot82.tmp
In the Look In drop-down list, select My Computer then press Enter.
Once located, select the file then press SHIFT+DELETE to delete it.
Repeat the said steps for all files listed.

• For Windows Vista and Windows 7 users:

Click Start>Computer.
In the Search input box, type:
%Program Files%\winpcap\rpcapd.exe
%Program Files%\winpcap\uninstall.exe
%User Temp%\bot3.tmp
%User Temp%\bot4.tmp
%User Temp%\bot7.tmp
%User Temp%\botA.tmp
%User Temp%\botD.tmp
%User Temp%\bot10.tmp
%User Temp%\bot13.tmp
%User Temp%\bot16.tmp
%User Temp%\bot19.tmp
%User Temp%\bot1C.tmp
%User Temp%\bot1F.tmp
%User Temp%\bot22.tmp
%User Temp%\bot25.tmp
%User Temp%\bot28.tmp
%User Temp%\bot2B.tmp
%User Temp%\bot2E.tmp
%User Temp%\bot31.tmp
%User Temp%\bot34.tmp
%User Temp%\bot37.tmp
%User Temp%\bot3A.tmp
%User Temp%\bot3D.tmp
%User Temp%\bot40.tmp
%User Temp%\bot43.tmp
%User Temp%\bot46.tmp
%User Temp%\bot49.tmp
%User Temp%\bot4C.tmp
%User Temp%\bot4F.tmp
%User Temp%\bot52.tmp
%User Temp%\bot55.tmp
%User Temp%\bot58.tmp
%User Temp%\bot5B.tmp
%User Temp%\bot5E.tmp
%User Temp%\bot61.tmp
%User Temp%\bot64.tmp
%User Temp%\bot67.tmp
%User Temp%\bot6A.tmp
%User Temp%\bot6D.tmp
%User Temp%\bot70.tmp
%User Temp%\bot73.tmp
%User Temp%\bot76.tmp
%User Temp%\bot79.tmp
%User Temp%\bot7C.tmp
%User Temp%\bot7F.tmp
%User Temp%\bot82.tmp
Once located, select the file then press SHIFT+DELETE to delete it.
Repeat the said steps for all files listed.
*Note: Read the following Microsoft page if these steps do not work on Windows 7.

Step 7

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

Step 8

Restore deleted/modified files and/or registry entries from backup

*Note: Only Microsoft-related files/keys/values will be restored. If this malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.

%System%\calc.exe
%System%\notepad.exe
%System%\mspaint.exe
%System%\sndrec32.exe
%System%\taskmgr.exe
%System%\spider.exe
%System%\sol.exe
%System%\dxdiag.exe
%System%\cleanmgr.exe
%Program Files%\common files\microsoft shared\msinfo\msinfo32.exe
%Program Files%\common files\microsoft shared\speech\sapisvr.exe
%Program Files%\internet explorer\connection wizard\icwconn1.exe
%Program Files%\internet explorer\connection wizard\icwconn2.exe
%Program Files%\internet explorer\connection wizard\icwrmind.exe
%Program Files%\internet explorer\connection wizard\icwtutor.exe
%Program Files%\internet explorer\connection wizard\inetwiz.exe
%Program Files%\internet explorer\connection wizard\isignup.exe
%Program Files%\internet explorer\iedw.exe
%Program Files%\internet explorer\iexplore.exe
%Program Files%\movie maker\moviemk.exe
%Program Files%\msn\msncorefiles\install\msn9components\digcore.exe
%Program Files%\msn\msncorefiles\install\msnsusii.exe
%Program Files%\msn gaming zone\windows\bckgzm.exe
%Program Files%\msn gaming zone\windows\chkrzm.exe
%Program Files%\msn gaming zone\windows\hrtzzm.exe
%Program Files%\msn gaming zone\windows\rvsezm.exe
%Program Files%\msn gaming zone\windows\shvlzm.exe
%Program Files%\msn gaming zone\windows\zclientm.exe
%Program Files%\netmeeting\conf.exe
%Program Files%\outlook express\msimn.exe
%Program Files%\outlook express\oemig50.exe
%Program Files%\outlook express\setup50.exe
%Program Files%\outlook express\wab.exe
%Program Files%\outlook express\wabmig.exe
%Program Files%\windows media player\migrate.exe
%Program Files%\windows media player\setup_wm.exe
%Program Files%\windows media player\wmplayer.exe
%Program Files%\windows nt\accessories\wordpad.exe
%Program Files%\windows nt\pinball\pinball.exe
%Program Files%\windows nt\dialer.exe
%Program Files%\windows nt\hypertrm.exe

Step 9

Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.

%User Temp%\bot2.tmp
%User Temp%\bot3.tmp
%User Temp%\bot4.tmp
%User Temp%\bot7.tmp
%User Temp%\botA.tmp
%User Temp%\botD.tmp
%User Temp%\bot10.tmp
%User Temp%\bot13.tmp
%User Temp%\bot16.tmp
%User Temp%\bot19.tmp
%User Temp%\bot1C.tmp
%User Temp%\bot1F.tmp
%User Temp%\bot22.tmp
%User Temp%\bot25.tmp
%User Temp%\bot28.tmp
%User Temp%\bot2B.tmp
%User Temp%\bot2E.tmp
%User Temp%\bot31.tmp
%User Temp%\bot34.tmp
%User Temp%\bot37.tmp
%User Temp%\bot3A.tmp
%User Temp%\bot3D.tmp
%User Temp%\bot40.tmp
%User Temp%\bot43.tmp
%User Temp%\bot46.tmp
%User Temp%\bot49.tmp
%User Temp%\bot4C.tmp
%User Temp%\bot4F.tmp
%User Temp%\bot52.tmp
%User Temp%\bot55.tmp
%User Temp%\bot58.tmp
%User Temp%\bot5B.tmp
%User Temp%\bot5E.tmp
%User Temp%\bot61.tmp
%User Temp%\bot64.tmp
%User Temp%\bot67.tmp
%User Temp%\bot6A.tmp
%User Temp%\bot6D.tmp
%User Temp%\bot70.tmp
%User Temp%\bot73.tmp
%User Temp%\bot76.tmp
%User Temp%\bot79.tmp
%User Temp%\bot7C.tmp
%User Temp%\bot7F.tmp
%User Temp%\bot82.tmp

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BKDR_BOTGOR.SML

OVERVIEW

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BKDR_BOTGOR.SML

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