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Virus.Win32.EXPIRO.JMA

March 01, 2023
 Analysis by: Ricardo III Valdez
 ALIASES:

Win32.Expiro.Gen.7 (BITDEFENDER)

 PLATFORM:

Windows

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

  • Threat Type: Virus

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware


This Virus arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It connects to certain websites to send and receive information.

  TECHNICAL DETAILS

File Size:

1,264,640 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

07 Feb 2023

Payload:

Connects to URLs/IPs, Steals information, Drops files, Displays windows

Arrival Details

This Virus 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 Virus drops the following files:

  • %Application Data%\{Random Hex Values}.bin

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

It adds the following mutexes to ensure that only one of its copies runs at any one time:

  • Global\Multiarch.m0yv-{Random Hex Values}-b
  • Global\Multiarch.m0yv-{Random Hex Values}-inf

File Infection

This Virus infects the following file types:

  • .EXE

It avoids infecting files that contain the following strings in their names:

  • windefend
  • UIODetect
  • svchost
  • TrustedInstaller
  • ntsvcs

Information Theft

This Virus gathers the following data:

  • Username
  • Computer Name
  • OS Information
  • System and User Default Language
  • Processor Architecture

Other Details

This Virus connects to the following website to send and receive information:

  • {BLOCKED}tj.biz
  • {BLOCKED}.{BLOCKED}.106.25
  • {BLOCKED}.{BLOCKED}.126.10
  • {BLOCKED}.{BLOCKED}.235.76
  • {BLOCKED}.{BLOCKED}.218.86
  • {BLOCKED}.{BLOCKED}.161.12
  • {BLOCKED}.{BLOCKED}.228.140
  • {BLOCKED}.{BLOCKED}.74.76
  • {BLOCKED}.{BLOCKED}.98.146
  • {BLOCKED}.{BLOCKED}.13.20
  • {BLOCKED}.{BLOCKED}.35.88
  • {BLOCKED}.{BLOCKED}.13.61
  • {BLOCKED}.{BLOCKED}.184.122
  • {BLOCKED}.{BLOCKED}.184.124
  • {BLOCKED}.{BLOCKED}.189.15
  • {BLOCKED}.{BLOCKED}.203.211
  • {BLOCKED}.{BLOCKED}.203.226
  • {BLOCKED}.{BLOCKED}.76.77
  • {BLOCKED}.{BLOCKED}.76.81
  • {BLOCKED}.{BLOCKED}.152.37
  • {BLOCKED}.{BLOCKED}.152.58

It does the following:

  • It targets executable files that are associated with the system's services and infects them.
  • It starts the infected services to ensure persistence.
  • It appends its malicious codes at the end of the targeted files.
  • It displays the following message box to deceive the user into thinking that it has executed a legitimate Adobe AIR installer:

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

18.274.08

FIRST VSAPI PATTERN DATE:

23 Feb 2023

VSAPI OPR PATTERN File:

18.275.00

VSAPI OPR PATTERN Date:

24 Feb 2023

Step 1

Trend Micro Predictive Machine Learning detects and blocks malware at the first sign of its existence, before it executes on your system. When enabled, your Trend Micro product detects this malware under the following machine learning name:

    • Troj.Win32.TRX.XXPE50FFF066

Step 2

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 3

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 4

Restart in Safe Mode

[ Learn More ]

Step 5

Search and delete this file

[ 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.
  • %Application Data%\{Random Hex Values}.bin

Step 6

Restart in normal mode and scan your computer with your Trend Micro product for files detected as Virus.Win32.EXPIRO.JMA. 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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