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IRC_RENAMED.H

June 18, 2013
 ALIASES:

IRC.Backdoor.Trojan (Symantec); Client-IRC.Win32.mIRC.602 (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan horse Generic13.QFH (AVG)

 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:

1,765,888 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

15 Jun 2013

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.

Installation

This Trojan creates the following folders:

  • %System Root%\logs
  • %System Root%\sounds
  • %System Root%\download

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

Other System Modifications

This Trojan adds the following registry keys:

HKEY_CURRENT_USER\Software\mIRC

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
mIRC

HKEY_CLASSES_ROOT\.cha

HKEY_CLASSES_ROOT\.chat

HKEY_CLASSES_ROOT\ChatFile

HKEY_CLASSES_ROOT\ChatFile\DefaultIcon

HKEY_CLASSES_ROOT\ChatFile\Shell\
open\command

HKEY_CLASSES_ROOT\ChatFile\Shell\
open\ddeexec

HKEY_CLASSES_ROOT\ChatFile\Shell\
open\ddeexec\Application

HKEY_CLASSES_ROOT\ChatFile\Shell\
open\ddeexec\ifexec

HKEY_CLASSES_ROOT\ChatFile\Shell\
open\ddeexec\Topic

HKEY_LOCAL_MACHINE\Software\Classes\
irc

HKEY_LOCAL_MACHINE\Software\Classes\
irc\DefaultIcon

HKEY_LOCAL_MACHINE\Software\Classes\
irc\Shell\open\
command

HKEY_LOCAL_MACHINE\Software\Classes\
irc\Shell\open\
ddeexec

HKEY_LOCAL_MACHINE\Software\Classes\
irc\Shell\open\
ddeexec\Application

HKEY_LOCAL_MACHINE\Software\Classes\
irc\Shell\open\
ddeexec\ifexec

HKEY_LOCAL_MACHINE\Software\Classes\
irc\Shell\open\
ddeexec\Topic

HKEY_CURRENT_USER\Software\Microsoft\
Microsoft Agent

It adds the following registry entries:

HKEY_CURRENT_USER\Software\mIRC
DateUsed = "1371184153"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
mIRC
DisplayName = "mIRC"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
mIRC
UninstallString = "{malware path and file name} -uninstall"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
irc
EditFlags = "{random values}"

HKEY_CURRENT_USER\Software\Microsoft\
Microsoft Agent
VoiceEnabled = "1"

HKEY_CURRENT_USER\Software\Microsoft\
Microsoft Agent
UseVoiceTips = "1"

HKEY_CURRENT_USER\Software\Microsoft\
Microsoft Agent
KeyHoldHotKey = "91"

HKEY_CURRENT_USER\Software\Microsoft\
Microsoft Agent
UseBeepSRPrompt = "1"

HKEY_CURRENT_USER\Software\Microsoft\
Microsoft Agent
SRTimerDelay = "7d"

HKEY_CURRENT_USER\Software\Microsoft\
Microsoft Agent
SRModeID = "{random values}"

HKEY_CURRENT_USER\Software\Microsoft\
Microsoft Agent
EnableSpeaking = "1"

HKEY_CURRENT_USER\Software\Microsoft\
Microsoft Agent
UseBalloon = "1"

HKEY_CURRENT_USER\Software\Microsoft\
Microsoft Agent
UseCharacterFont = "1"

HKEY_CURRENT_USER\Software\Microsoft\
Microsoft Agent
UseSoundEffects = "1"

HKEY_CURRENT_USER\Software\Microsoft\
Microsoft Agent
SpeakingSpeed = "5"

HKEY_CURRENT_USER\Software\Microsoft\
Microsoft Agent
PropertySheetX = "f423f"

HKEY_CURRENT_USER\Software\Microsoft\
Microsoft Agent
PropertySheetY = "f423f"

HKEY_CURRENT_USER\Software\Microsoft\
Microsoft Agent
PropertySheetWidth = "0"

HKEY_CURRENT_USER\Software\Microsoft\
Microsoft Agent
PropertySheetHeight = "0"

HKEY_CURRENT_USER\Software\Microsoft\
Microsoft Agent
PropertySheetPage = "0"

HKEY_CURRENT_USER\Software\Microsoft\
Microsoft Agent
CommandsWindowLeft = "ffffffff"

HKEY_CURRENT_USER\Software\Microsoft\
Microsoft Agent
CommandsWindowTop = "ffffffff"

HKEY_CURRENT_USER\Software\Microsoft\
Microsoft Agent
CommandsWindowWidth = "c8"

HKEY_CURRENT_USER\Software\Microsoft\
Microsoft Agent
CommandsWindowHeight = "c8"

HKEY_CURRENT_USER\Software\Microsoft\
Microsoft Agent
CommandsWindowLocationSet = "0"

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.300

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
    • mIRC
  • In HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Uninstall
    • mIRC
  • In HKEY_CLASSES_ROOT
    • .cha
  • In HKEY_CLASSES_ROOT
    • .chat
  • In HKEY_CLASSES_ROOT
    • ChatFile
  • In HKEY_CLASSES_ROOT\ChatFile
    • DefaultIcon
  • In HKEY_CLASSES_ROOT\ChatFile\Shell\open
    • command
  • In HKEY_CLASSES_ROOT\ChatFile\Shell\open
    • ddeexec
  • In HKEY_CLASSES_ROOT\ChatFile\Shell\open\ddeexec
    • Application
  • In HKEY_CLASSES_ROOT\ChatFile\Shell\open\ddeexec
    • ifexec
  • In HKEY_CLASSES_ROOT\ChatFile\Shell\open\ddeexec
    • Topic
  • In HKEY_LOCAL_MACHINE\Software\Classes
    • irc
  • In HKEY_LOCAL_MACHINE\Software\Classes\irc
    • DefaultIcon
  • In HKEY_LOCAL_MACHINE\Software\Classes\irc\Shell\open
    • command
  • In HKEY_LOCAL_MACHINE\Software\Classes\irc\Shell\open
    • ddeexec
  • In HKEY_LOCAL_MACHINE\Software\Classes\irc\Shell\open\ddeexec
    • Application
  • In HKEY_LOCAL_MACHINE\Software\Classes\irc\Shell\open\ddeexec
    • ifexec
  • In HKEY_LOCAL_MACHINE\Software\Classes\irc\Shell\open\ddeexec
    • Topic
  • In HKEY_CURRENT_USER\Software\Microsoft
    • Microsoft Agent

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\mIRC
    • DateUsed = "1371184153"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\mIRC
    • DisplayName = "mIRC"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\mIRC
    • UninstallString = "{malware path and file name} -uninstall"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\irc
    • EditFlags = "{random values}"
  • In HKEY_CURRENT_USER\Software\Microsoft\Microsoft Agent
    • VoiceEnabled = "1"
  • In HKEY_CURRENT_USER\Software\Microsoft\Microsoft Agent
    • UseVoiceTips = "1"
  • In HKEY_CURRENT_USER\Software\Microsoft\Microsoft Agent
    • KeyHoldHotKey = "91"
  • In HKEY_CURRENT_USER\Software\Microsoft\Microsoft Agent
    • UseBeepSRPrompt = "1"
  • In HKEY_CURRENT_USER\Software\Microsoft\Microsoft Agent
    • SRTimerDelay = "7d"
  • In HKEY_CURRENT_USER\Software\Microsoft\Microsoft Agent
    • SRModeID = "{random values}"
  • In HKEY_CURRENT_USER\Software\Microsoft\Microsoft Agent
    • EnableSpeaking = "1"
  • In HKEY_CURRENT_USER\Software\Microsoft\Microsoft Agent
    • UseBalloon = "1"
  • In HKEY_CURRENT_USER\Software\Microsoft\Microsoft Agent
    • UseCharacterFont = "1"
  • In HKEY_CURRENT_USER\Software\Microsoft\Microsoft Agent
    • UseSoundEffects = "1"
  • In HKEY_CURRENT_USER\Software\Microsoft\Microsoft Agent
    • SpeakingSpeed = "5"
  • In HKEY_CURRENT_USER\Software\Microsoft\Microsoft Agent
    • PropertySheetX = "f423f"
  • In HKEY_CURRENT_USER\Software\Microsoft\Microsoft Agent
    • PropertySheetY = "f423f"
  • In HKEY_CURRENT_USER\Software\Microsoft\Microsoft Agent
    • PropertySheetWidth = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Microsoft Agent
    • PropertySheetHeight = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Microsoft Agent
    • PropertySheetPage = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Microsoft Agent
    • CommandsWindowLeft = "ffffffff"
  • In HKEY_CURRENT_USER\Software\Microsoft\Microsoft Agent
    • CommandsWindowTop = "ffffffff"
  • In HKEY_CURRENT_USER\Software\Microsoft\Microsoft Agent
    • CommandsWindowWidth = "c8"
  • In HKEY_CURRENT_USER\Software\Microsoft\Microsoft Agent
    • CommandsWindowHeight = "c8"
  • In HKEY_CURRENT_USER\Software\Microsoft\Microsoft Agent
    • CommandsWindowLocationSet = "0"

Step 4

Search and delete these folders

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %System Root%\logs
  • %System Root%\sounds
  • %System Root%\download

Step 5

Scan your computer with your Trend Micro product to delete files detected as IRC_RENAMED.H. 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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