Overview

overview

10

Static

static

10

8b4b233e87...91.exe

windows7_x64

10

8b4b233e87...91.exe

windows10-2004_x64

10

Analysis

  • max time kernel
    4294180s
  • max time network
    122s
  • platform
    windows7_x64
  • resource
    win7-20220223-en
  • submitted
    05-03-2022 22:05

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General

  • Target

    8b4b233e87c61c8698e086b376da640c9ab2ecd71c58b1f6a2eceb60b7e1a691.exe

  • Size

    500KB

  • MD5

    dc82cd73d0738cfe2e49c499c2fa631e

  • SHA1

    81d1497490ee1ae20b2c87dff48cee31cdc4466f

  • SHA256

    8b4b233e87c61c8698e086b376da640c9ab2ecd71c58b1f6a2eceb60b7e1a691

  • SHA512

    6f67d86d4edb2ca0a31b2f206de7d1f6783124f30fedd527a2edf25efe6d885a5e64c8981dfbb91ab75dfa7213bc91465884ffb56747bb373911311c1c66f57d

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 18 IoCs

    Ransomware generally changes the extension on encrypted files.

    ransomware
  • Deletes itself 1 IoCs
  • 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 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Suspicious use of WriteProcessMemory 7 IoCs
  • System policy modification 1 TTPs 2 IoCs
    evasion

Processes

  • C:\Users\Admin\AppData\Local\Temp\8b4b233e87c61c8698e086b376da640c9ab2ecd71c58b1f6a2eceb60b7e1a691.exe
    "C:\Users\Admin\AppData\Local\Temp\8b4b233e87c61c8698e086b376da640c9ab2ecd71c58b1f6a2eceb60b7e1a691.exe"
    1⤵
    • Modifies extensions of user files
    • Drops file in Program Files directory
    • Drops file in Windows directory
    • Suspicious use of WriteProcessMemory
    • System policy modification
    PID:1100
    • C:\Windows\SysWOW64\cmd.exe
      cmd /c ""C:\Users\Admin\AppData\Local\Temp\update.bat" "
      2⤵
      • Deletes itself
      PID:1920

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

1
T1012

System Information Discovery

1
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

    328e5a4ddab70e2acca55d330c1dfce8

    SHA1

    944ef0483c863aa6804635d248e2a80d0a7d0bf4

    SHA256

    f32bfb8ae65d9b88519d86750a192cae83de68cbb5dcc5a1d788cb1390ae0845

    SHA512

    6f1e75b34488a870751ebda52638c98b7ae3a0d55f3a9ededa96702e06da3448eaf3cfe074b093e678cb45379253222c1ed954012f0e62a067763a5f51ab2706

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  • memory/1100-54-0x0000000075BE1000-0x0000000075BE3000-memory.dmp
    Filesize

    8KB

    Download