Analysis by: Jennifer Gumban
ALIASES:

Backdoor:MSIL/Bladabindi (Microsoft)

 PLATFORM:

Windows

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel: Downloaded from the Internet, Dropped by other malware

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.

It connects to a website to send and receive information.

It logs a user's keystrokes to steal information.

It gathers information and reports it to its servers.

  TECHNICAL DETAILS

File Size: 416,768 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 28 Aug 2015
Payload: Drops files, Connects to URLs/IPs, Logs keystrokes, Steals information

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 a copy of itself in the following folders using different file names:

  • %User Startup%\6e1d0a9f2198bf2fcb3838391d245aff.exe
  • {Drive Letter}:\! My Picutre.SCR
  • %User Temp%\googel.exe

(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 Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

It terminates the execution of the copy it initially executed and executes the copy it drops instead.

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
{malware file name} = "%User Temp%\googel.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
{malware file name} = "%User Temp%\googel.exe"

Other System Modifications

This Backdoor adds the following registry keys:

HKEY_CURRENT_USER\Software\6e1d0a9f2198bf2fcb3838391d245aff

It adds the following registry entries:

HKEY_CURRENT_USER\Environment
SEE_MASK_NOZONECHECKS = "1"

HKEY_CURRENT_USER\Software\6e1d0a9f2198bf2fcb3838391d245aff
US = "@"

Propagation

This Backdoor drops the following copy of itself in all physical and removable drives:

  • {drive letter}\! My Picutre.SCR

Backdoor Routine

This Backdoor connects to the following websites to send and receive information:

  • moon-k22.{BLOCKED}p.org:1178
  • {BLOCKED}.{BLOCKED}.99.26:1178

Information Theft

This Backdoor logs a user's keystrokes to steal information.

Other Details

This Backdoor does the following:

  • It bypasses firewall via netsh

It gathers the following information and reports it to its servers:

  • Computer name, country and serial number
  • User name
  • Operating system version

  SOLUTION

Minimum Scan Engine: 9.850

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

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Terminate a process file/s detected as BKDR_BLADABINDI.YYSQF

[ Learn More ]

*Note: If the detected file/s is/are not displayed in theWindows Task Manager, continue doing the next steps.

Step 4

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
    • 6e1d0a9f2198bf2fcb3838391d245aff

Step 5

Delete these registry values

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator’s help. You may also check out this Microsoft article first before modifying your computer's registry.

  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • 6e1d0a9f2198bf2fcb3838391d245aff = "%User Temp%\googel.exe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • 6e1d0a9f2198bf2fcb3838391d245aff = "%User Temp%\svchost.exe"
  • In HKEY_CURRENT_USER\Environment
    • SEE_MASK_NOZONECHECKS = "1"

Step 6

Scan your computer with your Trend Micro product to delete files detected as BKDR_BLADABINDI.YYSQF. 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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