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Diagram showing chain of attacks from the LemonDuck and LemonCat infrastructure, detailing specific attacker behavior common to both and highlight behavior unique to each infra

When coin miners evolve, Part 2: Hunting down LemonDuck and LemonCat attacks

[Note: In this two-part blog series, we expose a modern malware infrastructure and provide guidance for protecting against the wide range of threats it enables. Part 1 covered the evolution of the threat, how it spreads, and how it impacts ... continue reading
Protecting customers from a private-sector offensive actor using 0-day exploits and DevilsTongue malware

Protecting customers from a private-sector offensive actor using 0-day exploits and DevilsTongue malware

The Microsoft Threat Intelligence Center (MSTIC) alongside the Microsoft Security Response Center (MSRC) has uncovered a private-sector offensive actor, or PSOA, that we are calling SOURGUM in possession of now-patched, Windows 0-day exploits (CVE-2021-31979 and CVE-2021-33771). Private-sector offensive actors are ... continue reading
Microsoft discovers threat actor targeting SolarWinds Serv-U software with 0-day exploit

Microsoft discovers threat actor targeting SolarWinds Serv-U software with 0-day exploit

Microsoft has detected a 0-day remote code execution exploit being used to attack SolarWinds Serv-U FTP software in limited and targeted attacks. The Microsoft Threat Intelligence Center (MSTIC) attributes this campaign with high confidence to DEV-0322, a group operating out ... continue reading
Breaking down NOBELIUM’s latest early-stage toolset

Breaking down NOBELIUM’s latest early-stage toolset

As we reported in earlier blog posts, the threat actor NOBELIUM recently intensified an email-based attack that it has been operating and evolving since early 2021. We continue to monitor this active attack and intend to post additional details as ... continue reading
Example Flow of HMTL/ISO infection chain.

New sophisticated email-based attack from NOBELIUM

Microsoft Threat Intelligence Center (MSTIC) has uncovered a wide-scale malicious email campaign operated by NOBELIUM, the threat actor behind the attacks against SolarWinds, the SUNBURST backdoor, TEARDROP malware, GoldMax malware, and other related components. The campaign, initially observed and tracked ... continue reading

Mitigate OT security threats with these best practices

The security community is continuously changing, growing, and learning from each other to better position the world against cyber threats. In the latest Voice of the Community blog series post, Microsoft Product Marketing Manager Natalia Godyla talks with Chris Sistrunk, Technical ... continue reading
Analyzing attacks taking advantage of the Exchange Server vulnerabilities

Analyzing attacks taking advantage of the Exchange Server vulnerabilities

Microsoft continues to monitor and investigate attacks exploiting the recent on-premises Exchange Server vulnerabilities. These attacks are now performed by multiple threat actors ranging from financially motivated cybercriminals to state-sponsored groups. To help customers who are not able to immediately ... continue reading
MEM Home

Attack Surface Reduction Rules – Warn Mode with MEM/M365 Defender

Introduction This is John Barbare and I am a Sr Customer Engineer at Microsoft focusing on all things in the Cybersecurity space. In a previous blog back in July, 2020, I walked through a demo of setting up an Attack ... continue reading
USB2.jpg

MEM – All Things About USB Drive Management and Troubleshooting

Dear IT Pros, Today, we would discuss all things about USB flash drives management including access protection, Bitlocker encryption, AV security, and troubleshooting. Firstly, we should not reinvent the wheel, so we start with Paul Bergson’s excellent Tech blog article ... continue reading
GoldMax, GoldFinder, and Sibot: Analyzing NOBELIUM’s layered persistence

GoldMax, GoldFinder, and Sibot: Analyzing NOBELIUM’s layered persistence

Microsoft continues to work with partners and customers to expand our knowledge of the threat actor behind the nation-state cyberattacks that compromised the supply chain of SolarWinds and impacted multiple other organizations. As we have shared previously, we have observed ... continue reading