BKDR_AGENT.INZZ


 ALIASES:

RemoteAccess:Win32/GhostRadmin.dll, RemoteAccess:Win32/GhostRadmin (Microsoft); [00073df4.EXE\00073df4.EXE\0008d118.EXE]:RemAdm-RemoteAdmin., [00073df4.EXE\00073df4.EXE\00085e78.EX (McAfee); W32.SillyFDC (Symantec); PAK:ASPack, Backdoor.Win32.RA-based.bp (Kaspersky); Dropped:Backdoor.Generic.68224 (FSecure)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This backdoor 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:

610,304 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

20 Sep 2012

Arrival Details

This backdoor 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 backdoor drops the following copies of itself into the affected system:

  • %System%\myselff.exe

(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)

It creates the following folders:

  • %System%\winuping

(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)

Autostart Technique

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
selfbin = "%System%\myselff.exe"

Other System Modifications

This backdoor adds the following registry keys:

HKEY_LOCAL_MACHINE\SYSTEM\RAdmin

HKEY_LOCAL_MACHINE\SYSTEM\RAdmin\
v2.0

HKEY_LOCAL_MACHINE\SYSTEM\RAdmin\
v2.0\Server

HKEY_LOCAL_MACHINE\SYSTEM\RAdmin\
v2.0\Server\iplist

HKEY_LOCAL_MACHINE\SYSTEM\RAdmin\
v2.0\Server\Parameters

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\RAdmin\
v2.0\Server\Parameters
Port = "{random values}"

HKEY_LOCAL_MACHINE\SYSTEM\RAdmin\
v2.0\Server\Parameters
Timeout = "{random values}"

HKEY_LOCAL_MACHINE\SYSTEM\RAdmin\
v2.0\Server\Parameters
EnableLogFile = "{random values}"

HKEY_LOCAL_MACHINE\SYSTEM\RAdmin\
v2.0\Server\Parameters
LogFilePath = "%System Root%\logfile.txt"

HKEY_LOCAL_MACHINE\SYSTEM\RAdmin\
v2.0\Server\Parameters
FilterIp = "{random values}"

HKEY_LOCAL_MACHINE\SYSTEM\RAdmin\
v2.0\Server\Parameters
DisableTrayIcon = "{random values}"

HKEY_LOCAL_MACHINE\SYSTEM\RAdmin\
v2.0\Server\Parameters
AutoAllow = "{random values}"

HKEY_LOCAL_MACHINE\SYSTEM\RAdmin\
v2.0\Server\Parameters
AskUser = "{random values}"

HKEY_LOCAL_MACHINE\SYSTEM\RAdmin\
v2.0\Server\Parameters
EnableEventLog = "{random values}"

HKEY_LOCAL_MACHINE\SYSTEM\RAdmin\
v2.0\Server\Parameters
NTAuthEnabled = "{random values}"

HKEY_LOCAL_MACHINE\SYSTEM\RAdmin\
v2.0\Server\Parameters
Parameter = "{random values}"

Dropping Routine

This backdoor drops the following files:

  • %System%\instal_r.exe
  • %System%\winuping\AdmDll.dll
  • %System%\winuping\raddrv.dll
  • %System%\winuping\settings.reg
  • %System%\winuping\svchost.exe

(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.200

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

Restart in Safe Mode

[ Learn More ]

Step 3

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_LOCAL_MACHINE\SYSTEM
    • RAdmin
  • In HKEY_LOCAL_MACHINE\SYSTEM\RAdmin
    • v2.0
  • In HKEY_LOCAL_MACHINE\SYSTEM\RAdmin\v2.0
    • Server
  • In HKEY_LOCAL_MACHINE\SYSTEM\RAdmin\v2.0\Server
    • iplist
  • In HKEY_LOCAL_MACHINE\SYSTEM\RAdmin\v2.0\Server
    • Parameters

Step 4

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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • selfbin = "%System%\myselff.exe"
  • In HKEY_LOCAL_MACHINE\SYSTEM\RAdmin\v2.0\Server\Parameters
    • Port = "{random values}"
  • In HKEY_LOCAL_MACHINE\SYSTEM\RAdmin\v2.0\Server\Parameters
    • Timeout = "{random values}"
  • In HKEY_LOCAL_MACHINE\SYSTEM\RAdmin\v2.0\Server\Parameters
    • EnableLogFile = "{random values}"
  • In HKEY_LOCAL_MACHINE\SYSTEM\RAdmin\v2.0\Server\Parameters
    • LogFilePath = "%System Root%\logfile.txt"
  • In HKEY_LOCAL_MACHINE\SYSTEM\RAdmin\v2.0\Server\Parameters
    • FilterIp = "{random values}"
  • In HKEY_LOCAL_MACHINE\SYSTEM\RAdmin\v2.0\Server\Parameters
    • DisableTrayIcon = "{random values}"
  • In HKEY_LOCAL_MACHINE\SYSTEM\RAdmin\v2.0\Server\Parameters
    • AutoAllow = "{random values}"
  • In HKEY_LOCAL_MACHINE\SYSTEM\RAdmin\v2.0\Server\Parameters
    • AskUser = "{random values}"
  • In HKEY_LOCAL_MACHINE\SYSTEM\RAdmin\v2.0\Server\Parameters
    • EnableEventLog = "{random values}"
  • In HKEY_LOCAL_MACHINE\SYSTEM\RAdmin\v2.0\Server\Parameters
    • NTAuthEnabled = "{random values}"
  • In HKEY_LOCAL_MACHINE\SYSTEM\RAdmin\v2.0\Server\Parameters
    • Parameter = "{random values}"

Step 5

Search and delete these files

[ Learn More ]
There may be some component files 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.
  • %System%\instal_r.exe
  • %System%\winuping\AdmDll.dll
  • %System%\winuping\raddrv.dll
  • %System%\winuping\settings.reg
  • %System%\winuping\svchost.exe

Step 6

Search and delete this folder

[ 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%\winuping

Step 7

Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_AGENT.INZZ. 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.