John Shier

John Shier

John Shier is a Field CTO at Sophos. John is a popular presenter at security events, and is well-known for the clarity of his advice, even on the most complex security topics. John doesn't just talk the talk: he also gives hands-on technical support and product education to Sophos partners and customers.

Content by John Shier

It takes two: The 2025 Sophos Active Adversary Report

Security Operations

Threat Research

active adversary

Active Adversary Report

Compromised Credentials

detection

dwell time

featured

impact

incident response

LOLBIN

MFA

Monitoring

RDP

Remote Ransomware

root cause

It takes two: The 2025 Sophos Active Adversary Report

April 2, 2025

Active Adversary Report

Security Operations

Threat Research

active adversary

Active Adversary Report

featured

incident response

IR

LoLBINs

MDR

RDP

Security Operations

threat research

アクティブアドバーサリー

アクティブアドバーサリーレポート

インシデント対応

内部からの攻撃：ソフォスによるアクティブアドバーサリレポート

December 12, 2024

hourglass on laptop

Threat Research

active adversary

Active Adversary Report

Case Study

featured

incident response

RDP

Sophos X-Ops

It’s Oh So Quiet (?): The Sophos Active Adversary Report for 1H 2024

April 3, 2024

Threat Research

active adversary

Active Adversary Report

dwell time

featured

incident response

LoLBINs

MDR

practitioners

tools

The song remains the same: The 2023 Active Adversary Report for Security Practitioners

November 14, 2023

Time keeps on slippin’ slippin’ slippin’: The 2023 Active Adversary Report for Tech Leaders

Threat Research

active adversary

Active Adversary Report

Active Directory

attribution

detection

dwell time

featured

incident response

MFA

MTR

RDP

Sophos X-Ops

Time keeps on slippin’ slippin’ slippin’: The 2023 Active Adversary Report for Tech Leaders

August 23, 2023

Everything Everywhere All At Once: The 2023 Active Adversary Report for Business Leaders

Threat Research

active adversary

Active Adversary Report

CoinMiner

Conti

data breach

exfiltration

extortion

featured

incident response

loader

Lockbit

Ransomware

Sophos X-Ops

Web shells

Everything Everywhere All At Once: The 2023 Active Adversary Report for Business Leaders

April 25, 2023

shells-snails-sepia-markings-lines-snail-1610167-pxhere.com

Threat Research

active adversary

Active Adversary Report

cve-2021-31207

cve-2021-34473

cve-2021-34523

featured

ProxyLogon

ProxyShell

Security Operations

Sophos X-Ops

Web shells

Active Adversary Playbook 2022 Insights: Web Shells

June 22, 2022

sophos-news-banner-4-may-01 (1)

Security Operations

Threat Research

active adversary

Active Adversary Report

Artifacts

Attack Tools

cobalt strike

Cryptomining

cyberattacks

cyberthreats

dwell time

Exploit

featured

initial access broker

malware delivery system

MITRE

ProxyLogon

ProxyShell

Ransomware

ransomware as a service

Sophos Rapid Response

vulnerability

The Active Adversary Playbook 2022

June 7, 2022

gas pipeline hacker ransom attack

Security Operations

Colonial Pipeline

MFA

Ransomware

Security

vpn

What IT security teams can learn from the Colonial Pipeline ransomware attack

June 28, 2021