TROJ_DROPPER.EJQF
TrojanDropper:Win32/Henbang.A (Microsoft); [00043278.EXE]:AdClicker-HQ, [0002cc78.EXE]:AdClicker-HQ (McAfee); Adware.Henbang (Symantec); Worm.Win32.AutoRun.ibh (Kaspersky); Troj/Agent-INK (Sophos); Worm.Win32.AutoRun (Sunbelt); Adware:W32/Henbang (FSecure); Trojan horse Dropper.Generic.AEJE (AVG)
Windows
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.
TECHNICAL DETAILS
402,944 bytes
EXE
No
06 Dec 2014
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%\web.dat
- %System%\winweb.exe
(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)
Autostart Technique
This Trojan registers itself as a BHO to ensure its automatic execution every time Internet Explorer is used by adding the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Browser Helper Objects\{73EF2588-E4D1-4623-9B45-E0BBD6B65E9C}
Other System Modifications
This Trojan adds the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
AppID\{F6136F5A-4C58-40C7-8DFC-945F5570CB79}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
AppID\ad.DLL
HKEY_CLASSES_ROOT\ad.h.1
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
ad.h.1\CLSID
HKEY_CLASSES_ROOT\ad.h
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
ad.h\CLSID
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
ad.h\CurVer
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{73EF2588-E4D1-4623-9B45-E0BBD6B65E9C}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{73EF2588-E4D1-4623-9B45-E0BBD6B65E9C}\ProgID
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{73EF2588-E4D1-4623-9B45-E0BBD6B65E9C}\VersionIndependentProgID
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{73EF2588-E4D1-4623-9B45-E0BBD6B65E9C}\Programmable
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{73EF2588-E4D1-4623-9B45-E0BBD6B65E9C}\InprocServer32
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{73EF2588-E4D1-4623-9B45-E0BBD6B65E9C}\TypeLib
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{5A0063A5-F6E9-4947-9D1C-9300CE1BB342}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{5A0063A5-F6E9-4947-9D1C-9300CE1BB342}\1.0
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{5A0063A5-F6E9-4947-9D1C-9300CE1BB342}\1.0\
FLAGS
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{5A0063A5-F6E9-4947-9D1C-9300CE1BB342}\1.0\
0
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{5A0063A5-F6E9-4947-9D1C-9300CE1BB342}\1.0\
0\win32
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{5A0063A5-F6E9-4947-9D1C-9300CE1BB342}\1.0\
HELPDIR
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{78D814F1-9774-4F37-B7F9-CD8F88558B53}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{78D814F1-9774-4F37-B7F9-CD8F88558B53}\ProxyStubClsid
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{78D814F1-9774-4F37-B7F9-CD8F88558B53}\ProxyStubClsid32
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{78D814F1-9774-4F37-B7F9-CD8F88558B53}\TypeLib
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
AppID\{DD0AD1D0-6C36-4894-B38E-9E5D3392114D}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
AppID\iconhandle.DLL
HKEY_CLASSES_ROOT\iconhandle.seticon.1
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
iconhandle.seticon.1\CLSID
HKEY_CLASSES_ROOT\iconhandle.seticon
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
iconhandle.seticon\CLSID
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
iconhandle.seticon\CurVer
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{AEFA7E78-CF7E-4550-829F-2C786A0070BF}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{AEFA7E78-CF7E-4550-829F-2C786A0070BF}\ProgID
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{AEFA7E78-CF7E-4550-829F-2C786A0070BF}\VersionIndependentProgID
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{AEFA7E78-CF7E-4550-829F-2C786A0070BF}\Programmable
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{AEFA7E78-CF7E-4550-829F-2C786A0070BF}\InprocServer32
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{AEFA7E78-CF7E-4550-829F-2C786A0070BF}\TypeLib
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
txtfile\shellEx
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
txtfile\shellEx\IconHandler
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{581F1707-4AD0-4B7B-AD6E-057DB8F686F3}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{581F1707-4AD0-4B7B-AD6E-057DB8F686F3}\1.0
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{581F1707-4AD0-4B7B-AD6E-057DB8F686F3}\1.0\
FLAGS
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{581F1707-4AD0-4B7B-AD6E-057DB8F686F3}\1.0\
0
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{581F1707-4AD0-4B7B-AD6E-057DB8F686F3}\1.0\
0\win32
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{581F1707-4AD0-4B7B-AD6E-057DB8F686F3}\1.0\
HELPDIR
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{72397142-9352-4A45-99AD-2EF143072AC0}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{72397142-9352-4A45-99AD-2EF143072AC0}\ProxyStubClsid
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{72397142-9352-4A45-99AD-2EF143072AC0}\ProxyStubClsid32
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{72397142-9352-4A45-99AD-2EF143072AC0}\TypeLib
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
AppID\ad.DLL
AppID = "{F6136F5A-4C58-40C7-8DFC-945F5570CB79}"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{73EF2588-E4D1-4623-9B45-E0BBD6B65E9C}\InprocServer32
ThreadingModel = "Apartment"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{78D814F1-9774-4F37-B7F9-CD8F88558B53}\TypeLib
Version = "1.0"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
AppID\iconhandle.DLL
AppID = "{DD0AD1D0-6C36-4894-B38E-9E5D3392114D}"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{AEFA7E78-CF7E-4550-829F-2C786A0070BF}\InprocServer32
ThreadingModel = "Apartment"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{72397142-9352-4A45-99AD-2EF143072AC0}\TypeLib
Version = "1.0"
Dropping Routine
This Trojan drops the following files:
- %System%\webad.dll
- %System%\iconhandle.dll
(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)
This report is generated via an automated analysis system.
SOLUTION
9.700
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
Close all opened browser windows
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\Classes\AppID
- {F6136F5A-4C58-40C7-8DFC-945F5570CB79}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\AppID
- ad.DLL
- In HKEY_CLASSES_ROOT
- ad.h.1
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\ad.h.1
- CLSID
- In HKEY_CLASSES_ROOT
- ad.h
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\ad.h
- CLSID
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\ad.h
- CurVer
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID
- {73EF2588-E4D1-4623-9B45-E0BBD6B65E9C}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{73EF2588-E4D1-4623-9B45-E0BBD6B65E9C}
- ProgID
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{73EF2588-E4D1-4623-9B45-E0BBD6B65E9C}
- VersionIndependentProgID
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{73EF2588-E4D1-4623-9B45-E0BBD6B65E9C}
- Programmable
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{73EF2588-E4D1-4623-9B45-E0BBD6B65E9C}
- InprocServer32
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{73EF2588-E4D1-4623-9B45-E0BBD6B65E9C}
- TypeLib
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib
- {5A0063A5-F6E9-4947-9D1C-9300CE1BB342}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{5A0063A5-F6E9-4947-9D1C-9300CE1BB342}
- 1.0
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{5A0063A5-F6E9-4947-9D1C-9300CE1BB342}\1.0
- FLAGS
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{5A0063A5-F6E9-4947-9D1C-9300CE1BB342}\1.0
- 0
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{5A0063A5-F6E9-4947-9D1C-9300CE1BB342}\1.0\0
- win32
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{5A0063A5-F6E9-4947-9D1C-9300CE1BB342}\1.0
- HELPDIR
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface
- {78D814F1-9774-4F37-B7F9-CD8F88558B53}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{78D814F1-9774-4F37-B7F9-CD8F88558B53}
- ProxyStubClsid
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{78D814F1-9774-4F37-B7F9-CD8F88558B53}
- ProxyStubClsid32
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{78D814F1-9774-4F37-B7F9-CD8F88558B53}
- TypeLib
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\AppID
- {DD0AD1D0-6C36-4894-B38E-9E5D3392114D}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\AppID
- iconhandle.DLL
- In HKEY_CLASSES_ROOT
- iconhandle.seticon.1
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\iconhandle.seticon.1
- CLSID
- In HKEY_CLASSES_ROOT
- iconhandle.seticon
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\iconhandle.seticon
- CLSID
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\iconhandle.seticon
- CurVer
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID
- {AEFA7E78-CF7E-4550-829F-2C786A0070BF}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{AEFA7E78-CF7E-4550-829F-2C786A0070BF}
- ProgID
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{AEFA7E78-CF7E-4550-829F-2C786A0070BF}
- VersionIndependentProgID
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{AEFA7E78-CF7E-4550-829F-2C786A0070BF}
- Programmable
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{AEFA7E78-CF7E-4550-829F-2C786A0070BF}
- InprocServer32
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{AEFA7E78-CF7E-4550-829F-2C786A0070BF}
- TypeLib
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\txtfile
- shellEx
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\txtfile\shellEx
- IconHandler
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib
- {581F1707-4AD0-4B7B-AD6E-057DB8F686F3}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{581F1707-4AD0-4B7B-AD6E-057DB8F686F3}
- 1.0
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{581F1707-4AD0-4B7B-AD6E-057DB8F686F3}\1.0
- FLAGS
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{581F1707-4AD0-4B7B-AD6E-057DB8F686F3}\1.0
- 0
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{581F1707-4AD0-4B7B-AD6E-057DB8F686F3}\1.0\0
- win32
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{581F1707-4AD0-4B7B-AD6E-057DB8F686F3}\1.0
- HELPDIR
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface
- {72397142-9352-4A45-99AD-2EF143072AC0}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{72397142-9352-4A45-99AD-2EF143072AC0}
- ProxyStubClsid
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{72397142-9352-4A45-99AD-2EF143072AC0}
- ProxyStubClsid32
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{72397142-9352-4A45-99AD-2EF143072AC0}
- TypeLib
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\Classes\AppID\ad.DLL
- AppID = "{F6136F5A-4C58-40C7-8DFC-945F5570CB79}"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{73EF2588-E4D1-4623-9B45-E0BBD6B65E9C}\InprocServer32
- ThreadingModel = "Apartment"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{78D814F1-9774-4F37-B7F9-CD8F88558B53}\TypeLib
- Version = "1.0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\AppID\iconhandle.DLL
- AppID = "{DD0AD1D0-6C36-4894-B38E-9E5D3392114D}"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{AEFA7E78-CF7E-4550-829F-2C786A0070BF}\InprocServer32
- ThreadingModel = "Apartment"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{72397142-9352-4A45-99AD-2EF143072AC0}\TypeLib
- Version = "1.0"
Step 5
Search and delete these components
- %System%\webad.dll
- %System%\iconhandle.dll
Step 6
Scan your computer with your Trend Micro product to delete files detected as TROJ_DROPPER.EJQF. 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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