Content

BackDoor-DIY

Type
Trojan
SubType
Remote Access
Discovery Date
07/31/2006
Length
varies
Minimum DAT
4818 (07/31/2006)
Updated DAT
5715 (08/20/2009)
Minimum Engine
5.1.00
Description Added
07/31/2006
Description Modified
06/07/2007 8:50 PM (PT)
Risk Assessment
Corporate User
Low
Home User
Low

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Characteristics

Upon execution, the trojan drops itself to the following file:

  • %SystemDir%Flashy.exe
  • %UserProfile%\Start Menu\Programs\Startup\systemID.pif

It modifies the following registry keys:

  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    "Flashy Bot" = %SystemDir%Flashy.exe
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
     "Hidden" = 2
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
    "HideFileExt" = 1
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer
    "NoFolderOptions" = 1
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System
    "DisableTaskMgr" = 1
    "DisableRegistryTools" = 1

The trojan creates the mutex named "||Flashy||" to ensure only one instance is running. It runs the telnet service by running the following command.

  • "net start telnet"

It also runs the following command.

  • "user adminitdHator hacked"

 

Symptoms

  • Presence of the files mentioned.
  • Presence of the registry key mentioned:
  • Unexpected port open on the victim machine: (telnet service: tcp/23)

    • Method of Infection

    Some variants can copy themselves to the following drives.

    • D:
    • E:
    • F:
    • G:
    • H:
    • I:
    • J:

    Removal

    All Users:
    Use current engine and DAT files for detection and removal.

    Modifications made to the system Registry and/or INI files for the purposes of hooking system startup, will be successfully removed if cleaning with the recommended engine and DAT combination (or higher).

    Additional Windows ME/XP removal considerations

    Variants

    Variants

      N/A

    All Information

    Overview -

    This trojan is a remote access trojan. There are several variants of this trojan, and the specific actions taken are decided by the hacker who uses this trojan. The description is a general guide. Newer variant requires the latest DATs for detection.

    Aliases

    • Backdoor:Win32/Glupzy.A (Microsoft)
    • Trj/Flashy.A (Panda)
    • Troj/Glupzy-A (Sophos)
    • Trojan.Win32.Disabler.i (Kaspersky)
    • Win32/Glupzy.A (CA)
    • WORM_FLASHY.B (Trend Micro)

    Characteristics

    Characteristics -

    Upon execution, the trojan drops itself to the following file:

    • %SystemDir%Flashy.exe
    • %UserProfile%\Start Menu\Programs\Startup\systemID.pif

    It modifies the following registry keys:

    • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
      "Flashy Bot" = %SystemDir%Flashy.exe
    • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
       "Hidden" = 2
    • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
      "HideFileExt" = 1
    • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer
      "NoFolderOptions" = 1
    • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System
      "DisableTaskMgr" = 1
      "DisableRegistryTools" = 1

    The trojan creates the mutex named "||Flashy||" to ensure only one instance is running. It runs the telnet service by running the following command.

    • "net start telnet"

    It also runs the following command.

    • "user adminitdHator hacked"

     

    Symptoms

    Symptoms -

  • Presence of the files mentioned.
  • Presence of the registry key mentioned:
  • Unexpected port open on the victim machine: (telnet service: tcp/23)

    • Method of Infection

    Method of Infection -

    Some variants can copy themselves to the following drives.

    • D:
    • E:
    • F:
    • G:
    • H:
    • I:
    • J:

    Removal -

    Removal -

    All Users:
    Use current engine and DAT files for detection and removal.

    Modifications made to the system Registry and/or INI files for the purposes of hooking system startup, will be successfully removed if cleaning with the recommended engine and DAT combination (or higher).

    Additional Windows ME/XP removal considerations

    Variants

    Variants -

      N/A