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BKDR_IRCBOT.AAI

March 26, 2013
 Analysis by: Michael Cabel
 Modified by: Adrianne Chester Camat
 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: No

  • 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:

Yes

Initial Samples Received Date:

11 Mar 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
Wincpa or Windongs = "{Malware Path and File Name}"

Backdoor Routine

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

  • {BLOCKED}.{BLOCKED}.249.189:443
  • epic.dildoes.xxx

It joins any of the following IRC channel(s):

  • #test5
  • #test3

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:

  • USERNAME: zwin-{random}
  • PASSWORD: Op Dildos / dildos

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 number}
  • http://rolotech-electronics.comuf.com/speedtest/upload.php?x={random number}

  SOLUTION

Minimum Scan Engine:

9.300

FIRST VSAPI PATTERN FILE:

9.788.08

FIRST VSAPI PATTERN DATE:

09 Mar 2013

VSAPI OPR PATTERN File:

9.789.00

VSAPI OPR PATTERN Date:

10 Mar 2013

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_IRCBOT.AAI

Step 3

Terminate a process file/s detected as BKDR_IRCBOT.AAI

[ 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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • Wincpa = "{Malware Path and File Name}"

Step 5

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