BKDR_BLADABINDI.YYSQQ

July 17, 2017
 ALIASES:

Backdoor:MSIL/Noancooe.C (Microsoft); RDN/Generic.grp (McAfee); Trojan.Nancrat (Symantec); Trojan.MSIL.Agent.fpoy (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan horse SCGeneric2.ABWS (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:

489,984 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

17 Jul 2017

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:

  • %User Profile%\My Documents\app.exe

(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.)

It creates the following folders:

  • %User Profile%\Application Data\6ABCE574-4AFC-42C5-8AB9-5739A84D8A8B
  • %Program Files%\NAT Monitor
  • %User Profile%\6ABCE574-4AFC-42C5-8AB9-5739A84D8A8B\Logs
  • %User Profile%\Logs\Wilbert

(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.. %Program Files% is the Program Files folder, where it usually is C:\Program Files on all Windows operating system versions; C:\Program Files (x86) for 32-bit applications running on Windows 64-bit operating systems.)

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
NAT Monitor = "%Program Files%\NAT Monitor\natmon.exe"

Other System Modifications

This Backdoor deletes the following files:

  • {malware path and file name}:zone.identifier
  • %User Profile%\My Documents\app.exe
  • %User Profile%\My Documents\app.exe:Zone.Identifier
  • %User Profile%\NAT Monitor\natmon.exe
  • %Windows%\Microsoft.NET\Framework\v2.0.50727\RegAsm.exe:Zone.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.. %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)

Dropping Routine

This Backdoor drops the following files:

  • %User Startup%\app.lnk
  • %User Profile%\6ABCE574-4AFC-42C5-8AB9-5739A84D8A8B\run.dat

(Note: %User Startup% is the current user's Startup folder, which is usually C:\Documents and Settings\{user}\Start Menu\Programs\Startup on Windows 2000 and XP, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows Vista, 7, and 8.. %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.)

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.8

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 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
    • NAT Monitor = "%Program Files%\NAT Monitor\natmon.exe"

Step 4

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 Startup%\app.lnk
  • %User Profile%\6ABCE574-4AFC-42C5-8AB9-5739A84D8A8B\run.dat

Step 5

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.
  • %User Profile%\Application Data\6ABCE574-4AFC-42C5-8AB9-5739A84D8A8B
  • %Program Files%\NAT Monitor
  • %User Profile%\6ABCE574-4AFC-42C5-8AB9-5739A84D8A8B\Logs
  • %User Profile%\Logs\Wilbert

Step 6

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

Step 7

Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.

  • {malware path and file name}:zone.identifier
  • %User Profile%\My Documents\app.exe
  • %User Profile%\My Documents\app.exe:Zone.Identifier
  • %User Profile%\NAT Monitor\natmon.exe
  • %Windows%\Microsoft.NET\Framework\v2.0.50727\RegAsm.exe:Zone.Identifier


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