Analysis by: Mohammed Malubay
ALIASES:

N/A;

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

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

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: 4,274 bytes
File Type: BAT
Memory Resident: Yes
Initial Samples Received Date: 14 May 2021
Payload: Connects to URLs/IPs, Downloads files, Drops files

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.

Autostart Technique

This Trojan drops the following file(s) in the Startup Items folder to enable its automatic execution at every system startup:

  • %User Startup%\SystemLogin32Bits89.vbs → used to run SysTray.PS1

(Note: %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows 2003(32-bit), XP and 2000(32-bit), or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit), 10(64-bit).)

Download Routine

This Trojan connects to the following website(s) to download and execute a malicious file:

  • https://{BLOCKED}in.com/raw/Qtdc0Ngd
  • https://{BLOCKED}in.com/raw/xsd2m3nJ
  • https://{BLOCKED}in.com/raw/8AjnXrD3
  • https://{BLOCKED}in.com/raw/7fGvCFwR
  • https://{BLOCKED}in.com/raw/ciSqK9Rp
  • https://{BLOCKED}in.com/raw/US9TVDqH

It saves the files it downloads using the following names:

  • %User Temp%\SysTray.PS1 → detected as Trojan.PS1.ASYNCRAT.A

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 16.722.06
FIRST VSAPI PATTERN DATE: 16 May 2021
VSAPI OPR PATTERN File: 16.723.00
VSAPI OPR PATTERN Date: 17 May 2021

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 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.
  • %User Temp%\SysTray.PS1
  • %User Startup%\SystemLogin32Bits89.vbs

Step 5

Restart in normal mode and scan your computer with your Trend Micro product for files detected as Trojan.BAT.SNIP3.A. 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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