Overview

overview

10

Static

static

10

pys_d751f5436518.exe

windows7_x64

10

pys_d751f5436518.exe

windows10-2004_x64

10

Analysis

  • max time kernel
    148s
  • max time network
    138s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-en-20220113
  • submitted
    10-02-2022 18:26

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General

  • Target

    pys_d751f5436518.exe

  • Size

    500KB

  • MD5

    d751f54365181f544f908cc9ae3c91c5

  • SHA1

    51cbc9455b7781cf0529f299631e59016fe52e95

  • SHA256

    af99b482eb0b3ff976fa719bf0079da15f62a6c203911655ed93e52ae05c4ac8

  • SHA512

    04497dcac535c18247b13634db35a3a53369719696e700ff2c45637c616f6932ba22ddad2e3925055c92e5922f38c34f09ce8d87106f894a7a586ad0d41e6d33

Score
10/10
mespinozaransomwarespywarestealer

Malware Config

Signatures

  • Mespinoza Ransomware 2 TTPs

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

    ransomwaremespinoza
  • Modifies extensions of user files 10 IoCs

    Ransomware generally changes the extension on encrypted files.

    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 2 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 9 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of WriteProcessMemory 3 IoCs
  • System policy modification 1 TTPs 2 IoCs
    evasion

Processes

  • C:\Users\Admin\AppData\Local\Temp\pys_d751f5436518.exe
    "C:\Users\Admin\AppData\Local\Temp\pys_d751f5436518.exe"
    1⤵
    • Modifies extensions of user files
    • Checks computer location settings
    • Drops file in Program Files directory
    • Drops file in Windows directory
    • Suspicious use of WriteProcessMemory
    • System policy modification
    PID:4804
    • C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\update.bat" "
      2⤵
        PID:1080
    • C:\Windows\system32\svchost.exe
      C:\Windows\system32\svchost.exe -k netsvcs -p -s wuauserv
      1⤵
      • Drops file in Windows directory
      • Suspicious use of AdjustPrivilegeToken
      PID:2128
    • C:\Windows\winsxs\amd64_microsoft-windows-servicingstack_31bf3856ad364e35_10.0.19041.1220_none_7e21bc567c7ed16b\TiWorker.exe
      C:\Windows\winsxs\amd64_microsoft-windows-servicingstack_31bf3856ad364e35_10.0.19041.1220_none_7e21bc567c7ed16b\TiWorker.exe -Embedding
      1⤵
      • Drops file in Windows directory
      • Suspicious use of AdjustPrivilegeToken
      PID:4572

    Network

    MITRE ATT&CK Matrix ATT&CK v6

    Initial Access

    Execution

    Persistence

    Privilege Escalation

    Defense Evasion

    Modify Registry

    1
    T1112

    Credential Access

    Credentials in Files

    1
    T1081

    Discovery

    Query Registry

    2
    T1012

    System Information Discovery

    2
    T1082

    Lateral Movement

    Collection

    Data from Local System

    1
    T1005

    Exfiltration

    Command and Control

    Impact

    Data Encrypted for Impact

    1
    T1486

    Replay Monitor

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    Downloads

    • C:\Users\Admin\AppData\Local\Temp\update.bat
      MD5

      85a05d7c95deccd4b7ccc516641f00fe

      SHA1

      0b188a926ebb909ad8fd202ea51e5faa27eeba99

      SHA256

      4264caf50de1b6c24044bb5b6d1bff884c72a902f779c509f12578d777aac45d

      SHA512

      a7891dc1e8e2b899f983e82d4bf725476205799946ef2bdaf27670dc3b1b5b25eebc7d16b560c7b3d41664055c5650e11f359592f62a5a84b36ac229f575382b

      Download Submit
    • memory/2128-130-0x0000014C06D60000-0x0000014C06D70000-memory.dmp
      Filesize

      64KB

      Download
    • memory/2128-131-0x0000014C07320000-0x0000014C07330000-memory.dmp
      Filesize

      64KB

      Download
    • memory/2128-132-0x0000014C099C0000-0x0000014C099C4000-memory.dmp
      Filesize

      16KB

      Download