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Aliases: Backdoor:MSIL/Bladabindi (Microsoft); Trojan.MSIL.Zapchast.cqev (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan horse Packed_c.CDKB (AVG)
Malware type: Backdoor
Destructive: No
Platform: Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
Encrypted: Yes
In the wild: Yes


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

This malware is involved in a socially-engineered attack tailored to take advantage of the upcoming FIFA 2014 World Cup in Brazil. As it exhibits backdoor routines, users affected by this malware may find the security of their systems compromised.

To get a one-glance comprehensive view of the behavior of this Backdoor, refer to the Threat Diagram shown below.

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 executes commands from a remote malicious user, effectively compromising the affected system.

Technical Details

File size: 232,448 bytes
File type: EXE
Memory resident: Yes
Initial samples received date: 07 May 2014
Payload: Compromises system security, Steals information, Connects to URLs/IPs

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.


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

  • %User Temp%\pls.exe

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

It adds the following mutexes to ensure that only one of its copies runs at any one time:

  • f3ef1d36b8ed15fcea19675640dc1fb9

Autostart Technique

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

f3ef1d36b8ed15fcea19675640dc1fb9 = ""%User Temp%\pls.exe" .."

f3ef1d36b8ed15fcea19675640dc1fb9 = ""%User Temp%\pls.exe" .."

Other System Modifications

This backdoor adds the following registry entries:


It creates the following registry entry(ies) to bypass Windows Firewall:

%User Temp%\pls.exe = "%User Temp%\pls.exe:*:Enabled:pls.exe"

Backdoor Routine

This backdoor executes the following commands from a remote malicious user:

  • Download and execute files
  • Compress files for uploading
  • Load plugins
  • Ping
  • Registry management
  • Perform remote shell
  • Restart
  • Capture screenshots
  • Unistall itself
  • Update itself
  • Terminate itself

It connects to the following URL(s) to send and receive commands from a remote malicious user:


Information Theft

This backdoor gathers the following data:

  • Computer name
  • User name
  • OS version
  • Date of installation
  • Window title of open application


Minimum scan engine: 9.700
First VSAPI Pattern File: 10.780.02
First VSAPI Pattern Release Date: 07 May 2014
VSAPI OPR Pattern Version: 10.781.00
VSAPI OPR Pattern Release Date: 08 May 2014

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

Scan your computer with your Trend Micro product and note files detected as BKDR_BLADABIN.AB

Step 3

Terminate a process file/s detected as BKDR_BLADABIN.AB

[ 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 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\Environment
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • f3ef1d36b8ed15fcea19675640dc1fb9 = ""%User Temp%\pls.exe" .."
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • f3ef1d36b8ed15fcea19675640dc1fb9 = ""%User Temp%\pls.exe" .."
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
    • %User Temp%\pls.exe = "%User Temp%\pls.exe:*:Enabled:pls.exe"

Step 5

Scan your computer with your Trend Micro product to delete files detected as BKDR_BLADABIN.AB. 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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Analysis By: Automation
Modified By: Rika Joi Gregorio

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