Overview

overview

10

Static

static

10

Ransomware...KB.exe

windows10-ltsc_2021-x64

10

Ransomware...KB.exe

windows10-ltsc_2021-x64

10

Ransomware...KB.exe

windows10-ltsc_2021-x64

10

Ransomware...KB.exe

windows10-ltsc_2021-x64

10

Ransomware...KB.exe

windows10-ltsc_2021-x64

10

Ransomware...KB.exe

windows10-ltsc_2021-x64

10

Ransomware...KB.exe

windows10-ltsc_2021-x64

10

Ransomware...KB.exe

windows10-ltsc_2021-x64

10

Ransomware...KB.exe

windows10-ltsc_2021-x64

10

Ransomware...KB.exe

windows10-ltsc_2021-x64

Ransomware...KB.exe

windows10-ltsc_2021-x64

10

Ransomware...KB.exe

windows10-ltsc_2021-x64

10

Ransomware...KB.exe

windows10-ltsc_2021-x64

10

Ransomware...KB.exe

windows10-ltsc_2021-x64

10

Ransomware...KB.exe

windows10-ltsc_2021-x64

10

Ransomware...KB.exe

windows10-ltsc_2021-x64

7

Ransomware...KB.exe

windows10-ltsc_2021-x64

10

Ransomware...KB.exe

windows10-ltsc_2021-x64

10

Ransomware...KB.exe

windows10-ltsc_2021-x64

9

Ransomware...KB.exe

windows10-ltsc_2021-x64

9

Ransomware...KB.ps1

windows10-ltsc_2021-x64

10

Ransomware...KB.exe

windows10-ltsc_2021-x64

10

Ransomware...KB.exe

windows10-ltsc_2021-x64

10

Ransomware...KB.exe

windows10-ltsc_2021-x64

10

Ransomware...KB.exe

windows10-ltsc_2021-x64

10

Ransomware...KB.exe

windows10-ltsc_2021-x64

10

Ransomware...KB.exe

windows10-ltsc_2021-x64

10

Ransomware...KB.exe

windows10-ltsc_2021-x64

10

Ransomware...KB.exe

windows10-ltsc_2021-x64

10

Ransomware...KB.exe

windows10-ltsc_2021-x64

10

Ransomware...KB.msi

windows10-ltsc_2021-x64

10

Ransomware...KB.exe

windows10-ltsc_2021-x64

10

Resubmissions

30/11/2025, 12:12

251130-pc6htsvpft10

30/11/2025, 12:00

251130-n6lvvahl7110

09/11/2025, 19:58

251109-ypxk5asqhm10

06/11/2025, 21:43

251106-1kxrfatrhp10

03/11/2025, 21:39

251103-1hxzesak9z10

04/10/2025, 20:19

251004-y355es1qy910

09/04/2025, 13:37

250409-qwzeas1rx9

31/03/2025, 05:19

250331-fz687stwdz

31/03/2025, 05:18

250331-fzse2swn13

31/03/2025, 05:18

250331-fzmvkawnz8

Analysis

  • max time kernel
    510s
  • max time network
    526s
  • platform
    windows10-ltsc_2021_x64
  • resource
    win10ltsc2021-20250314-en
  • resource tags

    arch:x64arch:x86image:win10ltsc2021-20250314-enlocale:en-usos:windows10-ltsc_2021-x64system
  • submitted
    31/03/2025, 00:22

Sharing

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Report Analysis Logs

General

  • Target
    RansomwareSamples/Pysa_08_04_2021_500KB.exe
  • Size 500KB
  • Sample250331-apdw1ssjs8
  • SHA256 af99b482eb0b3ff976fa719bf0079da15f62a6c203911655ed93e52ae05c4ac8
  • MD5 SHA1 SHA512 SSDEEP
Score
10/10
mespinozadiscoveryransomwarespywarestealer

Malware Config

Extracted

Path

  • C:\0d722f8ad3ca85efb1571b68b47e\Readme.README

Ransom Note
  • Hi Company, Every byte on any types of your devices was encrypted. Don't try to use backups because it were encrypted too. To get all your data back contact us: [email protected] [email protected] [email protected] Also, be aware that we downloaded files from your servers and in case of non-payment we will be forced to upload them on our website, and if necessary, we will sell them on the darknet. Check out our website, we just posted there new updates for our partners: http://wqmfzni2nvbbpk25.onion/ -------------- FAQ: 1. Q: How can I make sure you don't fooling me? A: You can send us 2 files(max 2mb). 2. Q: What to do to get all data back? A: Don't restart the computer, don't move files and write us. 3. Q: What to tell my boss? A: Protect Your System Amigo.
URLs

  • http://wqmfzni2nvbbpk25.onion/

Signatures

  • Mespinoza Ransomware 2 TTPs

    Also known as Pysa. Ransomware-as-a-servoce which first appeared in 2020.

    ransomwaremespinoza
  • Mespinoza family
    mespinoza
  • Renames multiple (3455) files with added filename extension

    This suggests ransomware activity of encrypting all the files on the system.

    ransomware
  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Reads user/profile data of web browsers 3 TTPs

    Infostealers often target stored browser data, which can include saved credentials etc.

    spywarestealer
  • Drops file in Program Files directory 64 IoCs
  • Drops file in Windows directory 1 IoCs
  • Browser Information Discovery 1 TTPs

    Enumerate browser information.

    discovery
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • System Location Discovery: System Language Discovery 1 TTPs 2 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

    discovery
  • Suspicious use of WriteProcessMemory 3 IoCs
  • System policy modification 1 TTPs 2 IoCs
    defense_evasion

Processes

  • C:\Users\Admin\AppData\Local\Temp\RansomwareSamples\Pysa_08_04_2021_500KB.exe
    "C:\Users\Admin\AppData\Local\Temp\RansomwareSamples\Pysa_08_04_2021_500KB.exe"
    1⤵
    • Checks computer location settings
    • Drops file in Program Files directory
    • Drops file in Windows directory
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    • System policy modification
    PID:6048
    • C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\update.bat" "
      2⤵
      • System Location Discovery: System Language Discovery
      PID:6064

Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        Readme.README
        • Path C:\0d722f8ad3ca85efb1571b68b47e\Readme.README
        • Size 857B
        • SHA256 a6c464e2bf9768e383f164088e770d3e5aad5fb59772cb633fb506295183be6b
        • MD5 SHA1 SHA512
        Submit Download

        update.bat
        • Path C:\Users\Admin\AppData\Local\Temp\update.bat
        • Size 307B
        • SHA256 084b2e6a17b1322cd4932e2482f817f9f8d970762c4f163498d307c977ec72cc
        • MD5 SHA1 SHA512
        Submit Download