Malware Targeting Pulse Secure Devices

As part of CISA’s ongoing response to Pulse Secure compromises, CISA has analyzed 13 malware samples related to exploited Pulse Secure devices. CISA encourages users and administrators to review the following 13 malware analysis reports MARs for threat actor techniques, tactics, and procedures TT...

A New Critical SolarWinds Zero-Day Vulnerability Under Active Attack

SolarWinds, the Texas-based company that became the epicenter of a massive supply chain attack late last year, has issued patches to contain a remote code execution flaw in its Serv-U managed file transfer service. The fixes, which target Serv-U Managed File Transfer and Serv-U Secure FTP product...

Strategies, tools, and frameworks for building an effective threat intelligence team

How to think about building a threat intelligence program 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...

Strategies, tools, and frameworks for building an effective threat intelligence team

How to think about building a threat intelligence program 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...

Exploitation of Accellion File Transfer Appliance

Summary This joint advisory is the result of a collaborative effort by the cybersecurity authorities of Australia,1 New Zealand,2 Singapore,3 the United Kingdom,4 and the United States.56 These authorities are aware of cyber actors exploiting vulnerabilities in Accellion File Transfer Appliance...

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 they become available. In this blog, we highlight...

Updates to Alert on Pulse Connect Secure

CISA has updated Alert AA21-110A: Exploitation of Pulse Connect Secure Vulnerabilities to include new threat actor techniques, tactics, and procedures TTPs, indicators of compromise IOCs, and updated mitigations. CISA encourages users and administrators to review AA21-110A and the following...

Microsoft Warns of Data Stealing Malware That Pretends to Be Ransomware

Microsoft on Thursday warned of a "massive email campaign" that's pushing a Java-based STRRAT malware to steal confidential data from infected systems while disguising itself as a ransomware infection. "This RAT is infamous for its ransomware-like behavior of appending the file name extension...

Update to CISA-FBI Joint Cybersecurity Advisory on DarkSide Ransomware

CISA and the Federal Bureau of Investigation FBI have updated Joint Cybersecurity Advisory AA21-131A: DarkSide Ransomware: Best Practices for Preventing Disruption from Ransomware Attacks, originally released May 11, 2021. This update provides a downloadable STIX file of indicators of compromise...

CISA Releases Analysis Reports on New FiveHands Ransomware

CISA is aware of a recent, successful cyberattack against an organization using a new ransomware variant, known as FiveHands, that has been used to successfully conduct a cyberattack against an organization. CISA has released AR21-126A: FiveHands Ransomware and MAR-10324784-1.v1: FiveHands...

What’s New in InsightAppSec and tCell: Q1 2021 in Review

2021 is off and running! The big question on the corporate world’s mind is, of course, “What will work life look like at the end of 2021?” With vaccines rolling out around the world, another shift is set to take place around when and where people put in their hours. As offices slowly start to...

How to build a successful application security program

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 Tanya Janca, Founder of We Hack Purple...

Purple Fox Rootkit Can Now Spread Itself to Other Windows Computers

Purple Fox, a Windows malware previously known for infecting machines by using exploit kits and phishing emails, has now added a new technique to its arsenal that gives it worm-like propagation capabilities. The ongoing campaign makes use of a "novel spreading technique via indiscriminate port...

Threat Roundup for March 5 to March 12

Today, Talos is publishing a glimpse into the most prevalent threats we've observed between March 5 and March 12. As with previous roundups, this post isn't meant to be an in-depth analysis. Instead, this post will summarize the threats we've observed by highlighting key behavioral characteristic...

Threat Roundup for February 26 to March 5

Today, Talos is publishing a glimpse into the most prevalent threats we've observed between Feb. 26 and March 5. As with previous roundups, this post isn't meant to be an in-depth analysis. Instead, this post will summarize the threats we've observed by highlighting key behavioral characteristics...

Indiscriminate Exploitation of Microsoft Exchange Servers (CVE-2021-24085)

The following blog post was co-authored by Andrew Christian and Brendan Watters. Beginning Feb. 27, 2021, Rapid7’s Managed Detection and Response MDR team has observed a notable increase in the automated exploitation of vulnerable Microsoft Exchange servers to upload a webshell granting attackers...

Serious vulnerabilities fixed in Microsoft Exchange Server

Vulnerabilities have been fixed in Microsoft Exchange Server. A combination of several vulnerabilities allow a malicious person remotely able to execute arbitrary code under SYSTEM privileges Microsoft states that the vulnerabilities with attribute CVE-2021-26855, CVE-2021-26857, CVE-2021-26858 a...

Threat Roundup for February 19 to February 26

Today, Talos is publishing a glimpse into the most prevalent threats we've observed between Feb. 19 and Feb. 26. As with previous roundups, this post isn't meant to be an in-depth analysis. Instead, this post will summarize the threats we've observed by highlighting key behavioral characteristics...

Microsoft open sources CodeQL queries used to hunt for Solorigate activity

A key aspect of the Solorigate attack is the supply chain compromise that allowed the attacker to modify binaries in SolarWinds’ Orion product. These modified binaries were distributed via previously legitimate update channels and allowed the attacker to remotely perform malicious activities, suc...

Microsoft open sources CodeQL queries used to hunt for Solorigate activity

A key aspect of the Solorigate attack is the supply chain compromise that allowed the attacker to modify binaries in SolarWinds’ Orion product. These modified binaries were distributed via previously legitimate update channels and allowed the attacker to remotely perform malicious activities, suc...