Analysis by: Nikko Tamana
ALIASES:

Troj/Small-EVM (Sophos), W32/Agent.PHA (Fortinet), Trojan.Win32.Korlia (Ikarus), Backdoor.Win32.Small.lfp (Kaspersky), Trojan:Win32/Korlia.E (Microsoft)

 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: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

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.

  TECHNICAL DETAILS

File Size: 12,288 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 18 Feb 2013

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):

  • %Windows%\Tasks\err.ini

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

Other Details

This Trojan connects to the following possibly malicious URL:

  • {BLOCKED}c.{BLOCKED}ret.com
  • {BLOCKED}c2013.{BLOCKED}w.us

  SOLUTION

Minimum Scan Engine: 9.300
FIRST VSAPI PATTERN FILE: 9.790.07
FIRST VSAPI PATTERN DATE: 18 Feb 2013
VSAPI OPR PATTERN File: 9.791.00
VSAPI OPR PATTERN Date: 19 Feb 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

Restart in Safe Mode

[ Learn More ]

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.
  • %Windows%\Tasks\err.ini

Step 4

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