Analysis by: kathleenno
ALIASES:

Trojan.Gen (Symantec); Trojan:Win32/Evadiped.A (Microsoft); BackDoor-EDY.b (Mcafee); Mal/BHO-P (Sophos)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  TECHNICAL DETAILS

File Size: 335,885 bytes
File Type: DLL
Memory Resident: Yes
Initial Samples Received Date: 31 Mar 2011
Payload: Modifies system registry

Autostart Technique

This Trojan adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CLASSES_ROOT\CLSID\{AFD4AD01-58C1-47DB-A404-FBE00A6C5486}\
InprocServer32
(Default) = "{malware path and file name}"

It 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\{AFD4AD01-58C1-47DB-A404-FBE00A6C5486}

Other System Modifications

This Trojan adds the following registry keys as part of its installation routine:

HKEY_CLASSES_ROOT\main.BHO

HKEY_CLASSES_ROOT\main.BHO.1

HKEY_CLASSES_ROOT\AppID\main.DLL

HKEY_CLASSES_ROOT\AppID\{A0E1054B-01EE-4D57-A059-4D99F339709F}

HKEY_CLASSES_ROOT\CLSID\{AFD4AD01-58C1-47DB-A404-FBE00A6C5486}

HKEY_CLASSES_ROOT\Interface\{986A8AC1-AB4D-4F41-9068-4B01C0197867}

HKEY_CLASSES_ROOT\TypeLib\{8E3C68CD-F500-4A2A-8CB9-132BB38C3573}

  SOLUTION

Minimum Scan Engine: 8.900
FIRST VSAPI PATTERN FILE: 7.942.10
FIRST VSAPI PATTERN DATE: 31 Mar 2011

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

Scan your computer with your Trend Micro product and note files detected as TROJ_EVADIPED.E

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

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. Before you could do this, you must restart in Safe Mode. For instructions on how to do this, you may refer to this page If the preceding step requires you to restart in safe mode, you may proceed to edit the system registry.

 
  • In HKEY_CLASSES_ROOT
    • main.BHO
  • In HKEY_CLASSES_ROOT
    • main.BHO.1
  • In HKEY_CLASSES_ROOT\AppID
    • main.DLL
  • In HKEY_CLASSES_ROOT\AppID
    • {A0E1054B-01EE-4D57-A059-4D99F339709F}
  • In HKEY_CLASSES_ROOT\CLSID
    • {AFD4AD01-58C1-47DB-A404-FBE00A6C5486}
  • In HKEY_CLASSES_ROOT\Interface
    • {986A8AC1-AB4D-4F41-9068-4B01C0197867}
  • In HKEY_CLASSES_ROOT\TypeLib
    • {8E3C68CD-F500-4A2A-8CB9-132BB38C3573}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects
    • {AFD4AD01-58C1-47DB-A404-FBE00A6C5486}

Step 5

Search and delete the file detected as TROJ_EVADIPED.E

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden files in the search result.


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