TROJ_TIMONIST.A


 ALIASES:

TrojanDropper:Win32/VB.FY (Microsoft); [0000f110.EXE\000513d8.EXE]:Generic BackDoor.b, [0000f110.EXE\00052fd8.EXE\00052fd8.EXE]:PWS-Gina.dl (McAfee); Trojan Horse (Symantec); Backdoor.Win32.VB.aol (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan.Muldrop.1197.B (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.

  TECHNICAL DETAILS

File Size:

497,424 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

25 Apr 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.

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\{43C3C9D7-856D-4FF8-97AD-4B38EB6175E0}

Other System Modifications

This Trojan adds the following registry keys:

HKEY_CLASSES_ROOT\B3AEfile

HKEY_CLASSES_ROOT\.B3AE

HKEY_CLASSES_ROOT\B3AEfile\shell\
Open\command

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer\run

HKEY_CLASSES_ROOT\MfcTest.MfcTestObj.1

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
MfcTest.MfcTestObj.1\CLSID

HKEY_CLASSES_ROOT\MfcTest.MfcTestObj

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
MfcTest.MfcTestObj\CLSID

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
MfcTest.MfcTestObj\CurVer

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{43C3C9D7-856D-4FF8-97AD-4B38EB6175E0}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{43C3C9D7-856D-4FF8-97AD-4B38EB6175E0}\ProgID

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{43C3C9D7-856D-4FF8-97AD-4B38EB6175E0}\VersionIndependentProgID

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{43C3C9D7-856D-4FF8-97AD-4B38EB6175E0}\Programmable

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{43C3C9D7-856D-4FF8-97AD-4B38EB6175E0}\InprocServer32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{43C3C9D7-856D-4FF8-97AD-4B38EB6175E0}\TypeLib

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Browser Helper Objects

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{37068257-83A1-4CA8-B88A-D91CF1B7D51D}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{37068257-83A1-4CA8-B88A-D91CF1B7D51D}\1.0

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{37068257-83A1-4CA8-B88A-D91CF1B7D51D}\1.0\
FLAGS

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{37068257-83A1-4CA8-B88A-D91CF1B7D51D}\1.0\
0

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{37068257-83A1-4CA8-B88A-D91CF1B7D51D}\1.0\
0\win32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{37068257-83A1-4CA8-B88A-D91CF1B7D51D}\1.0\
HELPDIR

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{5F0CB20A-E778-43E7-8ED5-F9021C170012}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{5F0CB20A-E778-43E7-8ED5-F9021C170012}\ProxyStubClsid

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{5F0CB20A-E778-43E7-8ED5-F9021C170012}\ProxyStubClsid32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{5F0CB20A-E778-43E7-8ED5-F9021C170012}\TypeLib

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{9340A3FF-7922-4B4F-A789-59495B157A70}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{9340A3FF-7922-4B4F-A789-59495B157A70}\1.0

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{9340A3FF-7922-4B4F-A789-59495B157A70}\1.0\
FLAGS

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{9340A3FF-7922-4B4F-A789-59495B157A70}\1.0\
0

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{9340A3FF-7922-4B4F-A789-59495B157A70}\1.0\
0\win32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{9340A3FF-7922-4B4F-A789-59495B157A70}\1.0\
HELPDIR

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{41AD429E-FAF9-4D45-BDBD-AE08BCCF1B22}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{41AD429E-FAF9-4D45-BDBD-AE08BCCF1B22}\ProxyStubClsid

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{41AD429E-FAF9-4D45-BDBD-AE08BCCF1B22}\ProxyStubClsid32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{41AD429E-FAF9-4D45-BDBD-AE08BCCF1B22}\TypeLib

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{BC2BF882-E694-4787-9897-7511EF59614F}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{BC2BF882-E694-4787-9897-7511EF59614F}\ProxyStubClsid

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{BC2BF882-E694-4787-9897-7511EF59614F}\ProxyStubClsid32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{BC2BF882-E694-4787-9897-7511EF59614F}\TypeLib

HKEY_CLASSES_ROOT\CLSID\{ED54AAAA-2C30-4CE9-9FCF-17028AF006FD}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{ED54AAAA-2C30-4CE9-9FCF-17028AF006FD}\InprocServer32

HKEY_CLASSES_ROOT\Thead.Expcom

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer\run
R050B-DC97-43F0-8E08-F418B9 = "R050B-DC97-43F0-8E08-F418B9.B3AE"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{43C3C9D7-856D-4FF8-97AD-4B38EB6175E0}\InprocServer32
ThreadingModel = "Apartment"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{5F0CB20A-E778-43E7-8ED5-F9021C170012}\TypeLib
Version = "1.0"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{41AD429E-FAF9-4D45-BDBD-AE08BCCF1B22}\TypeLib
Version = "1.0"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{BC2BF882-E694-4787-9897-7511EF59614F}\TypeLib
Version = "1.0"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{ED54AAAA-2C30-4CE9-9FCF-17028AF006FD}
ProgID = "Thead.Expcom"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{ED54AAAA-2C30-4CE9-9FCF-17028AF006FD}\InprocServer32
ThreadingModel = "Apartment"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{ED54AAAA-2C30-4CE9-9FCF-17028AF006FD}
ToolboxBitmap32 = "%System%\USERSENV.DLL, 30000"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{ED54AAAA-2C30-4CE9-9FCF-17028AF006FD}
MiscStatus = "0"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{ED54AAAA-2C30-4CE9-9FCF-17028AF006FD}
MiscStatus\1 = "131473"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{ED54AAAA-2C30-4CE9-9FCF-17028AF006FD}
TypeLib = "{9340A3FF-7922-4B4F-A789-59495B157A70}"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{ED54AAAA-2C30-4CE9-9FCF-17028AF006FD}
VERSION = "1.0"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Thead.Expcom
Clsid = "{ED54AAAA-2C30-4CE9-9FCF-17028AF006FD}"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{41AD429E-FAF9-4D45-BDBD-AE08BCCF1B22}
ProxyStubClsid = "{00020424-0000-0000-C000-000000000046}"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{41AD429E-FAF9-4D45-BDBD-AE08BCCF1B22}
ProxyStubClsid32 = "{00020424-0000-0000-C000-000000000046}"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{BC2BF882-E694-4787-9897-7511EF59614F}
ProxyStubClsid = "{00020420-0000-0000-C000-000000000046}"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{BC2BF882-E694-4787-9897-7511EF59614F}
ProxyStubClsid32 = "{00020420-0000-0000-C000-000000000046}"

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

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

Close all opened browser windows

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_CLASSES_ROOT
    • B3AEfile
  • In HKEY_CLASSES_ROOT
    • .B3AE
  • In HKEY_CLASSES_ROOT\B3AEfile\shell\Open
    • command
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer
    • run
  • In HKEY_CLASSES_ROOT
    • MfcTest.MfcTestObj.1
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\MfcTest.MfcTestObj.1
    • CLSID
  • In HKEY_CLASSES_ROOT
    • MfcTest.MfcTestObj
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\MfcTest.MfcTestObj
    • CLSID
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\MfcTest.MfcTestObj
    • CurVer
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID
    • {43C3C9D7-856D-4FF8-97AD-4B38EB6175E0}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{43C3C9D7-856D-4FF8-97AD-4B38EB6175E0}
    • ProgID
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{43C3C9D7-856D-4FF8-97AD-4B38EB6175E0}
    • VersionIndependentProgID
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{43C3C9D7-856D-4FF8-97AD-4B38EB6175E0}
    • Programmable
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{43C3C9D7-856D-4FF8-97AD-4B38EB6175E0}
    • InprocServer32
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{43C3C9D7-856D-4FF8-97AD-4B38EB6175E0}
    • TypeLib
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer
    • Browser Helper Objects
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib
    • {37068257-83A1-4CA8-B88A-D91CF1B7D51D}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{37068257-83A1-4CA8-B88A-D91CF1B7D51D}
    • 1.0
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{37068257-83A1-4CA8-B88A-D91CF1B7D51D}\1.0
    • FLAGS
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{37068257-83A1-4CA8-B88A-D91CF1B7D51D}\1.0
    • 0
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{37068257-83A1-4CA8-B88A-D91CF1B7D51D}\1.0\0
    • win32
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{37068257-83A1-4CA8-B88A-D91CF1B7D51D}\1.0
    • HELPDIR
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface
    • {5F0CB20A-E778-43E7-8ED5-F9021C170012}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{5F0CB20A-E778-43E7-8ED5-F9021C170012}
    • ProxyStubClsid
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{5F0CB20A-E778-43E7-8ED5-F9021C170012}
    • ProxyStubClsid32
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{5F0CB20A-E778-43E7-8ED5-F9021C170012}
    • TypeLib
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib
    • {9340A3FF-7922-4B4F-A789-59495B157A70}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{9340A3FF-7922-4B4F-A789-59495B157A70}
    • 1.0
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{9340A3FF-7922-4B4F-A789-59495B157A70}\1.0
    • FLAGS
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{9340A3FF-7922-4B4F-A789-59495B157A70}\1.0
    • 0
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{9340A3FF-7922-4B4F-A789-59495B157A70}\1.0\0
    • win32
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{9340A3FF-7922-4B4F-A789-59495B157A70}\1.0
    • HELPDIR
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface
    • {41AD429E-FAF9-4D45-BDBD-AE08BCCF1B22}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{41AD429E-FAF9-4D45-BDBD-AE08BCCF1B22}
    • ProxyStubClsid
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{41AD429E-FAF9-4D45-BDBD-AE08BCCF1B22}
    • ProxyStubClsid32
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{41AD429E-FAF9-4D45-BDBD-AE08BCCF1B22}
    • TypeLib
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface
    • {BC2BF882-E694-4787-9897-7511EF59614F}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{BC2BF882-E694-4787-9897-7511EF59614F}
    • ProxyStubClsid
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{BC2BF882-E694-4787-9897-7511EF59614F}
    • ProxyStubClsid32
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{BC2BF882-E694-4787-9897-7511EF59614F}
    • TypeLib
  • In HKEY_CLASSES_ROOT\CLSID
    • {ED54AAAA-2C30-4CE9-9FCF-17028AF006FD}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{ED54AAAA-2C30-4CE9-9FCF-17028AF006FD}
    • InprocServer32
  • In HKEY_CLASSES_ROOT
    • Thead.Expcom

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
    • R050B-DC97-43F0-8E08-F418B9 = "R050B-DC97-43F0-8E08-F418B9.B3AE"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{43C3C9D7-856D-4FF8-97AD-4B38EB6175E0}\InprocServer32
    • ThreadingModel = "Apartment"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{5F0CB20A-E778-43E7-8ED5-F9021C170012}\TypeLib
    • Version = "1.0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{41AD429E-FAF9-4D45-BDBD-AE08BCCF1B22}\TypeLib
    • Version = "1.0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{BC2BF882-E694-4787-9897-7511EF59614F}\TypeLib
    • Version = "1.0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{ED54AAAA-2C30-4CE9-9FCF-17028AF006FD}
    • ProgID = "Thead.Expcom"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{ED54AAAA-2C30-4CE9-9FCF-17028AF006FD}\InprocServer32
    • ThreadingModel = "Apartment"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{ED54AAAA-2C30-4CE9-9FCF-17028AF006FD}
    • ToolboxBitmap32 = "%System%\USERSENV.DLL, 30000"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{ED54AAAA-2C30-4CE9-9FCF-17028AF006FD}
    • MiscStatus = "0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{ED54AAAA-2C30-4CE9-9FCF-17028AF006FD}
    • MiscStatus\1 = "131473"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{ED54AAAA-2C30-4CE9-9FCF-17028AF006FD}
    • TypeLib = "{9340A3FF-7922-4B4F-A789-59495B157A70}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{ED54AAAA-2C30-4CE9-9FCF-17028AF006FD}
    • VERSION = "1.0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Thead.Expcom
    • Clsid = "{ED54AAAA-2C30-4CE9-9FCF-17028AF006FD}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{41AD429E-FAF9-4D45-BDBD-AE08BCCF1B22}
    • ProxyStubClsid = "{00020424-0000-0000-C000-000000000046}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{41AD429E-FAF9-4D45-BDBD-AE08BCCF1B22}
    • ProxyStubClsid32 = "{00020424-0000-0000-C000-000000000046}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{BC2BF882-E694-4787-9897-7511EF59614F}
    • ProxyStubClsid = "{00020420-0000-0000-C000-000000000046}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{BC2BF882-E694-4787-9897-7511EF59614F}
    • ProxyStubClsid32 = "{00020420-0000-0000-C000-000000000046}"

Step 5

Scan your computer with your Trend Micro product to delete files detected as TROJ_TIMONIST.A. 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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