BKDR_NETWIRED.JZ

July 11, 2015
 ALIASES:

Backdoor:Win32/NetWiredRC.C (Microsoft); RDN/Generic BackDoor!bdp (McAfee); Trojan.Gen.2 (Symantec); Trojan-Spy.Win32.Recam.vzw (Kaspersky); Troj/Agent-ANTL (Sophos); Trojan.Win32.Generic!BT (Sunbelt); Trojan horse MSIL8.AFBV (AVG)

 PLATFORM:

Windows

 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:

854,920 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

11 Jul 2015

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.

Autostart Technique

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
ProLogs = "%User Profile%\Microsoft\HKRUN.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{77MIM72O-1777-WTX0-5X7E-L5N3254Q5N46}
StubPath = "%User Profile%\Microsoft\HKRUN.exe "

Other System Modifications

This backdoor adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{77MIM72O-1777-WTX0-5X7E-L5N3254Q5N46}

Dropping Routine

This backdoor drops the following files:

  • %User Profile%\Microsoft\HKRUN.exe
  • %User Profile%\Microsoft\.Identifier

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)

Other Details

This backdoor connects to the following possibly malicious URL:

  • {BLOCKED}33.82
  • {BLOCKED}.148.181
  • {BLOCKED}.208.108
  • {BLOCKED}2.162.99
  • {BLOCKED}3.226.153

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.750

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

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\SOFTWARE\Microsoft\Active Setup\Installed Components
    • {77MIM72O-1777-WTX0-5X7E-L5N3254Q5N46}

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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • ProLogs = "%User Profile%\Microsoft\HKRUN.exe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components\{77MIM72O-1777-WTX0-5X7E-L5N3254Q5N46}
    • StubPath = "%User Profile%\Microsoft\HKRUN.exe "

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.
  • %User Profile%\Microsoft\HKRUN.exe
  • %User Profile%\Microsoft\.Identifier

Step 6

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