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TROJ_DELFIN.G

October 08, 2012
 Analysis by: Roland Marco Dela Paz
 PLATFORM:

Windows 2000, XP, Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  TECHNICAL DETAILS

File Size:

492,032 bytes

File Type:

PE

Memory Resident:

Yes

Initial Samples Received Date:

07 Aug 2010

Installation

This Trojan adds the following folders:

  • %Application Data%\SystemProc
  • %Program Files%\Mozilla Firefox
  • %Program Files%\Mozilla Firefox\extensions
  • %Program Files%\Mozilla Firefox\extensions\{Firefox CLSID}
  • %Program Files%\Mozilla Firefox\extensions\{Firefox CLSID}\chrome
  • %Program Files%\Mozilla Firefox\extensions\{Firefox CLSID}\chrome\content

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Windows\Profiles\{user name}\Application Data on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Application Data on Windows NT, and C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003.. %Program Files% is the default Program Files folder, usually C:\Program Files.)

Autostart Technique

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer\Run
RTHDBPL = %Application Data%\SystemProc\lsass.exe

It drops the following files:

  • %Application Data%\SystemProc\lsass.exe - copy of itself
  • %Program Files%\Mozilla Firefox\extensions\{Firefox CLSID}\chrome\content\timer.xul - non-malicious component
  • %Program Files%\Mozilla Firefox\extensions\{Firefox CLSID}\install.rdf - non-malicious component
  • %Program Files%\Mozilla Firefox\extensions\{Firefox CLSID}\chrome.manifest - non-malicious component

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Windows\Profiles\{user name}\Application Data on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Application Data on Windows NT, and C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003.. %Program Files% is the default Program Files folder, usually C:\Program Files.)

Other System Modifications

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

HKEY_CURRENT_USER\Identities
Curr version = 25

HKEY_CURRENT_USER\Identities
Last Date = {date}

HKEY_CURRENT_USER\Identities
Inst Date = {date}

HKEY_CURRENT_USER\Identities
Popup count = 0

HKEY_CURRENT_USER\Identities
Popup time = 0

HKEY_CURRENT_USER\Identities
Popup date = 0

HKEY_CURRENT_USER\Identities
KillSelf = ok

HKEY_CURRENT_USER\Identities
First Start = {malware path and filename}

HKEY_CURRENT_USER\Identities
Send Inst = ok

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