TROJ_PINCAV.BI


 ALIASES:

TrojanSpy:Win32/Keylogger.FM (Microsoft); Generic VB.i (McAfee); Trojan.Gen (Symantec); Trojan-Dropper.Win32.VB.axcz, Trojan-Dropper.Win32.VB.axcz (Kaspersky); Trojan-Spy.Win32.KeyLogger (Sunbelt); Gen:Trojan.Heur.VP.dm0@aCDDPgcG (FSecure)

 PLATFORM:

Windows 2000, XP, 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:

49,152 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

08 Oct 2011

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.

Other System Modifications

This Trojan adds the following registry keys:

HKEY_CURRENT_USER\Software\VB and VBA Program Settings\
ZSM\ZM

It adds the following registry entries:

HKEY_CURRENT_USER\Software\VB and VBA Program Settings\
ZSM\ZM
SE = "Send"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager\Accounts
AssociatedID = {random values}

HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager
Server ID = 4

HKEY_CURRENT_USER\Software\VB and VBA Program Settings\
ZSM\ZM
SE = "Sendok"

It modifies the following registry entries:

HKEY_CURRENT_USER\Identities
Last Username = "Main Identity"

(Note: The default value data of the said registry entry is Main Identity.)

HKEY_CURRENT_USER\Identities
Last User ID = "{341F68BA-C841-4200-A7B4-3D5CFF202166}"

(Note: The default value data of the said registry entry is {5D1D9894-914A-4AF9-BD82-81F349A83013}.)

HKEY_CURRENT_USER\Identities
Identity Login = 9853

(Note: The default value data of the said registry entry is 98053.)

HKEY_CURRENT_USER\Identities
Identity Ordinal = 2

(Note: The default value data of the said registry entry is 1.)

Dropping Routine

This Trojan drops the following files:

  • %Windows%\Help\services.exe
  • %Windows%\Help\Melt.bat

(Note: %Windows% is the Windows folder, which is usually C:\Windows.)

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

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_CURRENT_USER\Software\VB and VBA Program Settings\ZSM
    • ZM

Step 3

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_CURRENT_USER\Software\VB and VBA Program Settings\ZSM\ZM
    • SE="Send"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager\Accounts
    • AssociatedID={random values}
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager
    • Server ID=4
  • In HKEY_CURRENT_USER\Software\VB and VBA Program Settings\ZSM\ZM
    • SE="Sendok"

Step 4

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_CURRENT_USER\Identities
    • From: Last Username="Main Identity"
      To: Last Username=Main Identity
  • In HKEY_CURRENT_USER\Identities
    • From: Last User ID="{341F68BA-C841-4200-A7B4-3D5CFF202166}"
      To: Last User ID={5D1D9894-914A-4AF9-BD82-81F349A83013}
  • In HKEY_CURRENT_USER\Identities
    • From: Identity Login=9853
      To: Identity Login=98053
  • In HKEY_CURRENT_USER\Identities
    • From: Identity Ordinal=2
      To: Identity Ordinal=1

Step 5

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.
  • %Windows%\Help\services.exe
  • %Windows%\Help\Melt.bat

Step 6

Scan your computer with your Trend Micro product to delete files detected as TROJ_PINCAV.BI. 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.


Did this description help? Tell us how we did.