Analysis by: Warren Adam Sto. Tomas
ALIASES:

Trojan-Downloader.Win32.Autohk (Ikarus)

 PLATFORM:

Windows

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

  • Threat Type: Trojan Spy

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

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

This Trojan Spy 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: 878,592 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 17 Feb 2023

Arrival Details

This Trojan Spy 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 Spy adds the following processes:

It creates the following folders:

  • %AppData%\Kaspersky PURE v3.0 (attributes set to Read-Only, System, and Hidden)

Other Details

This Trojan Spy does the following:

  • It opens the following folder:
    • %System Root%\Kaspersky PURE v3.0\Vault
  • It copies the following files if they don't exist in the created folder yet (%AppData%\Kaspersky PURE v3.0) and sets their attributes to Read-Only, System, and Hidden):
    • Files with .exe extension in {Malware Directory}
  • It must be executed as winlogin.exe in order to proceed with the copying of files.

(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 18.262.07
FIRST VSAPI PATTERN DATE: 17 Feb 2023
VSAPI OPR PATTERN File: 18.263.00
VSAPI OPR PATTERN Date: 18 Feb 2023

Step 1

Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 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

Restart in Safe Mode

[ Learn More ]

Step 4

Search and delete these folders

[ 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.  
  • %AppData%\Kaspersky PURE v3.0

Step 5

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TrojanSpy.Win32.FAUXPERSKY.AB. 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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