TROJ_INJECT.AMR

October 09, 2012
 Analysis by: Sabrina Lei Sioting
 Modified by: Erika Bianca Mendoza
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

This Trojan is a component of another malware that exports functions to be able to perform its malicious routines.

It may also be installed by its main component as a service to automatically execute on startup.

It is capable of logging the user activities on the affected system.

It also has a function that is capable of connecting to a URL via HTTP POST.

This Trojan arrives as a file that exports the functions of other malware/grayware. It may be dropped by other malware.

It may be injected into processes running in memory.

  TECHNICAL DETAILS

File Size:

131,584 bytes

File Type:

DLL

Initial Samples Received Date:

15 Apr 2011

Payload:

Connects to URLs/Ips

Arrival Details

This Trojan arrives as a file that exports the functions of other malware/grayware.

It may be dropped by other malware.

Installation

This Trojan may be injected into processes running in memory.

Other System Modifications

This Trojan adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
SS

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
SS\PROXY

NOTES:

Other Details

This file is a component of another malware that exports functions to be able to perform its malicious routines. It may also be installed by its main component as a service to automatically execute on startup. It is capable of logging the user activities on the affected system. It is recorded in the following file:

  • %Application Data%\SSK.LOG

This file also has a function that is capable of connecting to the following URL via HTTP POST:

  • {BLOCKED}work-sec.net/update?id={value}

  SOLUTION

Minimum Scan Engine:

8.900

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Restart in Safe Mode

[ Learn More ]

Step 3

Delete this registry key

[ 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\Classes
    • SS

Step 4

Search and delete this file

[ Learn More ]
There may be some component 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. %Application Data%\SSK.LOG

Step 5

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