Analysis by: Jon Dexter Laurin
ALIASES:

HackTool.MSIL.WebShell.a (Kaspersky); Troj/MSIL-BCD (Sophos); Trojan-Cleaver (NAI); Trojan.Generic.12276383 (BitDefender); W32/TzeeBot.A!tr (Fortinet); MSIL/HackTool.Agent.EN trojan (ESET-NOD32); Trojan dotnet/Hacktool.AJUV (Norman)

 PLATFORM:

Windows

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

  • Threat Type: Hacking Tool

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

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

This hacking tool 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: 10,752 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 15 May 2015
Payload: Displays graphics/image

Arrival Details

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

Other Details

This hacking tool requires the following additional components to properly run:

  • {Grayware Path}\modules\sql.txt
  • {Grayware Path}\modules\main.txt
  • {Grayware Path}\modules\fileman.txt
  • {Grayware Path}\modules\info.txt
  • {Grayware Path}\modules\cmd.txt

NOTES:

Upon execution, it displays the following window:

It may create the following file if the components are present:

  • {Grayware Path}\out.aspx

  SOLUTION

Minimum Scan Engine: 9.750
SSAPI PATTERN File: 1.511.00
SSAPI PATTERN Date: 15 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

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

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.  {Grayware Path}\out.aspx

Step 4

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