ALIASES:

Trojan:Win32/WebToos.A (Microsoft); [00020228.EXE]:RDN/Generic BackDoor!zb, [00010628.EXE]:NTRootKit-K (McAfee); Rootkit.Win32.Agent.eguv (Kaspersky); Troj/RKPort-Fam (Sophos); Trojan.Win32.Generic!BT (Sunbelt); Trojan horse Downloader.Generic13.CNZL.dropper (AVG)

 PLATFORM:

Windows

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

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: 1,315,840 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 06 Dec 2014

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 creates the following folders:

  • %Program Files%\DbSecuritySpt

(Note: %Program Files% is the Program Files folder, where it usually is C:\Program Files on all Windows operating system versions; C:\Program Files (x86) for 32-bit applications running on Windows 64-bit operating systems.)

Dropping Routine

This backdoor drops the following files:

  • %Program Files%\DbSecuritySpt\DbSecuritySpt.exe
  • %Program Files%\DbSecuritySpt\svch0st.exe
  • %Program Files%\DbSecuritySpt\SESDKDummy.dll

(Note: %Program Files% is the Program Files folder, where it usually is C:\Program Files on all Windows operating system versions; C:\Program Files (x86) for 32-bit applications running on Windows 64-bit operating systems.)

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine: 9.700

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

Search and delete these components

[ Learn More ]
There may be some components 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.
  • %Program Files%\DbSecuritySpt\DbSecuritySpt.exe
  • %Program Files%\DbSecuritySpt\svch0st.exe
  • %Program Files%\DbSecuritySpt\SESDKDummy.dll

Step 3

Search and delete this folder

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %Program Files%\DbSecuritySpt

Step 4

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