New Malware Backdoors Microsoft Exchange Servers Worldwide

Share post:

Hackers are using newly detected malware to backdoor Microsoft Exchange servers of government and military organizations from Europe, the Middle East, Asia, and Africa.

The malware, named SessionManager by Kaspersky researchers, who first detected it in early 2022, is a malicious native-code module for the tech giant’s Internet Information Services (IIS) web server software.

It has been used in the wild without being detected since at least March 2021, right after the start of last year’s notorious wave of ProxyLogon attacks.

“The SessionManager backdoor enables threat actors to keep persistent, update-resistant and rather stealth access to the IT infrastructure of a targeted organization,” Kaspersky said on Thursday.

Session Manager has the following features:

  • dropping and managing arbitrary files on compromised servers
  • remote command execution on backdoored devices
  • connecting to endpoints within the victim’s local network and controlling the network traffic

Moreover, Kaspersky in April 2022 found that many of the malware samples detected earlier were still deployed on 34 servers of 24 organizations as late as June 2022.

After deployment, the malicious IIS module enables the attackers to harvest credentials from system memory, obtain information from the victims’ network and infected devices, and deliver more payloads.

According to victimology and the use of an HTTP server-type backdoor variant called OwlProxy, Kaspersky security experts believe the SessionManager IIS backdoor was leveraged in these attacks by the Gelsemium group as part of a global espionage operation.

The Gelsemium APT gang gained infamy for targeting governments, electronics manufacturers, and universities from East Asia and the Middle East and mostly operating under the radar.

For more information, read the original story in Bleepingcomputer.

SUBSCRIBE NOW

Related articles

Security research team claims to have helped avert a major supply chain attack

JFrog Security Research team continuously scans public repositories such as Docker Hub, NPM, and PyPI to identify malicious...

Phishing attacks on state and local governments surge by 360%

Phishing attacks targeting state and local governments have surged by 360% between May 2023 and May 2024, according...

What is Ticketmaster saying to its customers?

Here's the letter that has been sent out out to Ticketmaster clients that a reader sent to me....

Cyber Security Today, July 8, 2024 – New ransomware group discovered, and summer podcast break starts

A new ransomware group is discovered. Welcome to Cyber Security Today. It's Monday July 8th, 2024. I'm Howard Solomon,...

Become a member

New, Relevant Tech Stories. Our article selection is done by industry professionals. Our writers summarize them to give you the key takeaways