arrow_back
search
close

BKDR_IRCBOT.BCAQ

April 24, 2013
 Analysis by: Anthony Joe Melgarejo
 ALIASES:

Trojan:Win32/Ircbrute (Microsoft), W32.Pilleuz (Symantec), Trojan.PWS.Fareit.U (Bitdefender), W32/Dorkbot.SUP!tr (Fortinet), Trojan-Dropper.Win32.Injector (Ikarus), Win32/Injector.AFKU trojan (ESET)

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: Yes

  • 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.

  TECHNICAL DETAILS

File Size:

Varies

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

24 Apr 2013

Payload:

Compromises system security, 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.

Installation

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

  • evil1loldild0s

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
Windongs = "{Malware Path and File Name}"

Backdoor Routine

This backdoor connects to any of the following IRC server(s):

  • {BLOCKED}n.{BLOCKED}s.cat

It accesses a remote Internet Relay Chat (IRC) server where it receives the following commands from a remote malicious user:

  • (DOWNLOAD) - Downloads and execute arbitrary file
  • (EXEC) - Executes command
  • (GET) - Sends GET floods
  • (HELP) - Print Commands
  • (OPENURL) - Opens a URL using a hidden browser
  • (POST) - Sends POST floods
  • (QUIT) - Terminate itself
  • (SHELL EXEC) - Executes shell command
  • (SPEEDTEST) - check connection speed (rolotech-electronics.comuf.com, speedtest1.hivelocity.net, 68.11.12.242)
  • (STOP EXEC) - Stops a thread
  • (STOP GET) - Stops GET floods
  • (STOP SPEEDTEST) - Stops speedtest
  • (STOP SYN) - Stops a SYN Flood
  • (STOP UDP) - Stops UDP Flooding
  • (SYN) - Sends a SYN Flood
  • (UDP) - Starts UDP Flooding
  • (VERSION) - Print Version

Other Details

This backdoor uses the following credentials when accessing its IRC server:

  • NICK: zwin-{random letters}|{random number}|

NOTES:

It connects to the following sites to perform a speed test:

  • http://speedtest1.hivelocity.net/speedtest/upload.php?x={random value}
  • http://68.11.12.242/speedtest/upload.php?x={random value}
  • http://rolotech-electronics.comuf.com/speedtest/upload.php?x={random value}

  SOLUTION

Minimum Scan Engine:

9.300

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

Identify and terminate files detected as BKDR_IRCBOT.BCAQ

[ Learn More ]
  1. Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
  2. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  3. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

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
    • Windongs = "{Malware Path and File Name}"

Step 4

Scan your computer with your Trend Micro product to delete files detected as BKDR_IRCBOT.BCAQ. 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.