BKDR_AGENT.AGUE
Backdoor:Win32/Botgor.B (Microsoft); W32/Botgor (McAfee); Trojan.Gen (Symantec); BehavesLike.Win32.Malware.ssc (mx-v) (Sunbelt)
Windows 2000, Windows XP, Windows Server 2003
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.
It modifies files, disabling programs and applications from properly running.
TECHNICAL DETAILS
924,164 bytes
EXE
Yes
17 Oct 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\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.. %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.)
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 files:
- %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\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.. %Program Files% is the default Program Files folder, usually C:\Program Files.)
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.)
It adds the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\BN1
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\BN1
G = "DAC8E678-EC76-4E1E-A8508309921E8601"
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.. %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.)
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
9.200
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
Identify and delete files detected as BKDR_AGENT.AGUE using either the Startup Disk or Recovery Console
Step 3
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_LOCAL_MACHINE\SOFTWARE
- BN1
Step 4
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\SOFTWARE\BN1
- G = "DAC8E678-EC76-4E1E-A8508309921E8601"
- 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 this modified 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\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
- From: Userinit = "%System%\userinit.exe,%System%\bot1.exe,"
To: Userinit = ""%Windows%\system32\userinit.exe,""
- From: Userinit = "%System%\userinit.exe,%System%\bot1.exe,"
Step 6
Search and delete these 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
Step 7
Scan your computer with your Trend Micro product to delete files detected as BKDR_AGENT.AGUE. 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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