DDOS_BENERGY.A

March 29, 2014
 ALIASES:

Mal/ZAccess-CK (Sophos) ,Trojan horse Generic_r.DPY (AVG) ,W32/Kryptik.BWMB!tr (Fortinet) ,Trojan.Win32.Alureon (Ikarus) ,Trojan-Spy.Win32.Zbot.rrxn (Kaspersky) ,Backdoor:Win32/Phdet.S (Microsoft) ,PWS-Zbot-FBDC!364327C5B05C (McAfee) ,a variant of Win32/Kryptik.BWMB trojan (Eset) ,Trojan.Win32.Generic!BT (Sunbelt)

 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:
 INFORMATION EXPOSURE:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It also has rootkit capabilities, which enables it to hide its processes and files from the user.

It performs denial of service (DoS) attacks on affected systems using specific flooding method(s).

It connects to certain websites to send and receive information.

  TECHNICAL DETAILS

File Size:

189,440 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

24 Mar 2014

Payload:

Launches DoS/DDoS attacks

Arrival Details

This Trojan 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 Trojan drops the following file(s)/component(s):

  • %System%\drivers\str.sys

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)

It drops the following component file(s):

  • %System%\Drivers\nethost.sys - detected as RTKT_BENERGY.A

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)

It drops the following copies of itself into the affected system:

  • %System%\nethost.exe

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)

Rootkit Capabilities

This Trojan also has rootkit capabilities, which enables it to hide its processes and files from the user.

Denial of Service (DoS) Attack

This Trojan performs denial of service (DoS) attacks on affected systems using the following flooding method(s):

  • TCP, UDP, ICMP and HTTP Traffic

Information Theft

This Trojan s configuration file contains the following information:

  • HTTP Key
  • Sleep Frequency
  • Target DNS/Ip
  • Protocols

Other Details

This Trojan connects to the following website to send and receive information:

  • http://{BLOCKED}asto.{BLOCKED}r.ru/getcfg.php
  • http://{BLOCKED}o.{BLOCKED}r.ru/ya/getcfg.php
  • http://{BLOCKED}asto.{BLOCKED}r.ru/ya/getcfg.php

  SOLUTION

Minimum Scan Engine:

9.700

FIRST VSAPI PATTERN FILE:

10.684.07

FIRST VSAPI PATTERN DATE:

24 Mar 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

Remove the malware/grayware file dropped/downloaded by DDOS_BENERGY.A

     
    • RTKT_BENERGY.A

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

Search and delete these files

[ Learn More ]
There may be some files 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.
  • %System%\drivers\str.sys

Step 5

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