Critical Exchange Server Flaw (CVE-2024-21410) Under Active Exploitation

Microsoft on Wednesday acknowledged that a newly disclosed critical security flaw in Exchange Server has been actively exploited in the wild, a day after it released fixes for the vulnerability as part of its Patch Tuesday updates. Tracked as CVE-2024-21410 (CVSS score: 9.8), the issue has been described as a case of privilege escalation impacting the Exchange Server. "An attacker

Belarusian National Linked to BTC-e Faces 25 Years for $4 Billion Crypto Money Laundering

A 42-year-old Belarusian and Cypriot national with alleged connections to the now-defunct cryptocurrency exchange BTC-e is facing charges related to money laundering and operating an unlicensed money services business. Aliaksandr Klimenka, who was arrested in Latvia on December 21, 2023, was extradited to the U.S. and is currently being held in custody. If convicted, he faces a maximum penalty

Preventing Data Loss: Backup and Recovery Strategies for Exchange Server Administrators

In the current digital landscape, data has emerged as a crucial asset for organizations, akin to currency. It’s the lifeblood of any organization in today's interconnected and digital world. Thus, safeguarding the data is of paramount importance. Its importance is magnified in on-premises Exchange Server environments where vital business communication and emails are stored and managed.  In

Founder of Bitzlato Cryptocurrency Exchange Pleads Guilty in Money-Laundering Scheme

The Russian founder of the now-defunct Bitzlato cryptocurrency exchange has pleaded guilty, nearly 11 months after he was arrested in Miami earlier this year. Anatoly Legkodymov (aka Anatolii Legkodymov, Gandalf, and Tolik), according to the U.S. Justice Department, admitted to operating an unlicensed money-transmitting business that enabled other criminal actors to launder their

N. Korean Hackers 'Mixing' macOS Malware Tactics to Evade Detection

The North Korean threat actors behind macOS malware strains such as RustBucket and KANDYKORN have been observed "mixing and matching" different elements of the two disparate attack chains, leveraging RustBucket droppers to deliver KANDYKORN. The findings come from cybersecurity firm SentinelOne, which also tied a third macOS-specific malware called ObjCShellz to the RustBucket campaign

Turla's New DeliveryCheck Backdoor Breaches Ukrainian Defense Sector

The defense sector in Ukraine and Eastern Europe has been targeted by a novel .NET-based backdoor called DeliveryCheck (aka CAPIBAR or GAMEDAY) that's capable of delivering next-stage payloads. The Microsoft threat intelligence team, in collaboration with the Computer Emergency Response Team of Ukraine (CERT-UA), attributed the attacks to a Russian nation-state actor known as Turla, which is

U.S. Government Agencies' Emails Compromised in China-Backed Cyber Attack

An unnamed Federal Civilian Executive Branch (FCEB) agency in the U.S. detected anomalous email activity in mid-June 2023, leading to Microsoft's discovery of a new China-linked espionage campaign targeting two dozen organizations. The details come from a joint cybersecurity advisory released by the U.S. Cybersecurity and Infrastructure Security Agency (CISA) and Federal Bureau of Investigation

State-Backed Hackers Employ Advanced Methods to Target Middle Eastern and African Governments

Governmental entities in the Middle East and Africa have been at the receiving end of sustained cyber-espionage attacks that leverage never-before-seen and rare credential theft and Exchange email exfiltration techniques. "The main goal of the attacks was to obtain highly confidential and sensitive information, specifically related to politicians, military activities, and ministries of foreign

New PowerExchange Backdoor Used in Iranian Cyber Attack on UAE Government

An unnamed government entity associated with the United Arab Emirates (U.A.E.) was targeted by a likely Iranian threat actor to breach the victim's Microsoft Exchange Server with a "simple yet effective" backdoor dubbed PowerExchange. According to a new report from Fortinet FortiGuard Labs, the intrusion relied on email phishing as an initial access pathway, leading to the execution of a .NET

Microsoft Urges Customers to Secure On-Premises Exchange Servers

Microsoft is urging customers to keep their Exchange servers updated as well as take steps to bolster the environment, such as enabling Windows Extended Protection and configuring certificate-based signing of PowerShell serialization payloads. "Attackers looking to exploit unpatched Exchange servers are not going to go away," the tech giant's Exchange Team said in a post. "There are too many

Bitzlato Crypto Exchange Founder Arrested for Aiding Cybercriminals

The U.S. Department of Justice (DoJ) on Wednesday announced the arrest of Anatoly Legkodymov (aka Gandalf and Tolik), the cofounder of Hong Kong-registered cryptocurrency exchange Bitzlato, for allegedly processing $700 million in illicit funds. The 40-year-old Russian national, who was arrested in Miami, was charged in a U.S. federal court with "conducting a money transmitting business that

Iranian Government Entities Under Attack by New Wave of BackdoorDiplomacy Attacks

The threat actor known as BackdoorDiplomacy has been linked to a new wave of attacks targeting Iranian government entities between July and late December 2022. Palo Alto Networks Unit 42, which is tracking the activity under its constellation-themed moniker Playful Taurus, said it observed the government domains attempting to connect to malware infrastructure previously identified as associated

Ransomware Hackers Using New Way to Bypass MS Exchange ProxyNotShell Mitigations

Threat actors affiliated with a ransomware strain known as Play are leveraging a never-before-seen exploit chain that bypasses blocking rules for ProxyNotShell flaws in Microsoft Exchange Server to achieve remote code execution (RCE) through Outlook Web Access (OWA). "The new exploit method bypasses URL rewrite mitigations for the Autodiscover endpoint," CrowdStrike researchers Brian Pitchford,

Microsoft Issues Improved Mitigations for Unpatched Exchange Server Vulnerabilities

Microsoft on Friday disclosed it has made more improvements to the mitigation method offered as a means to prevent exploitation attempts against the newly disclosed unpatched security flaws in Exchange Server. To that end, the tech giant has revised the blocking rule in IIS Manager from ".*autodiscover\.json.*Powershell.*" to "(?=.*autodiscover\.json)(?=.*powershell)." <!--adsense--> The list of

Mitigation for Exchange Zero-Days Bypassed! Microsoft Issues New Workarounds

Microsoft has updated its mitigation measures for the newly disclosed and actively exploited zero-day flaws in Exchange Server after it was found that they could be trivially bypassed. The two vulnerabilities, tracked as CVE-2022-41040 and CVE-2022-41082, have been codenamed ProxyNotShell due to similarities to another set of flaws called ProxyShell, which the tech giant resolved last year.

ProxyNotShell – the New Proxy Hell?

Nicknamed ProxyNotShell, a new exploit used in the wild takes advantage of the recently published Microsoft Server-Side Request Forgery (SSRF) vulnerability CVE-2022-41040 and a second vulnerability, CVE-2022-41082 that allows Remote Code Execution (RCE) when PowerShell is available to unidentified attackers. Based on ProxyShell, this new zero-day abuse risk leverage a chained attack similar to

State-Sponsored Hackers Likely Exploited MS Exchange 0-Days Against ~10 Organizations

Microsoft on Friday disclosed that a single activity group in August 2022 achieved initial access and breached Exchange servers by chaining the two newly disclosed zero-day flaws in a limited set of attacks aimed at less than 10 organizations globally. "These attacks installed the Chopper web shell to facilitate hands-on-keyboard access, which the attackers used to perform Active Directory

WARNING: New Unpatched Microsoft Exchange Zero-Day Under Active Exploitation

Security researchers are warning of previously undisclosed flaws in fully patched Microsoft Exchange servers being exploited by malicious actors in real-world attacks to achieve remote code execution on affected systems. The advisory comes from Vietnamese cybersecurity company GTSC, which discovered the shortcomings as part of its security monitoring and incident response efforts in August 2022.

Hackers Using Malicious OAuth Apps to Take Over Email Servers

Microsoft on Thursday warned of a consumer-facing attack that made use of rogue OAuth applications deployed on compromised cloud tenants to ultimately seize control of Exchange servers and spread spam. "The threat actor launched credential stuffing attacks against high-risk accounts that didn't have multi-factor authentication (MFA) enabled and leveraged the unsecured administrator accounts to

New 'SessionManager' Backdoor Targeting Microsoft IIS Servers in the Wild

A newly discovered malware has been put to use in the wild at least since March 2021 to backdoor Microsoft Exchange servers belonging to a wide range of entities worldwide, with infections lingering in 20 organizations as of June 2022. Dubbed SessionManager, the malicious tool masquerades as a module for Internet Information Services (IIS), a web server software for Windows systems, after

APT Hackers Targeting Industrial Control Systems with ShadowPad Backdoor

Entities located in Afghanistan, Malaysia, and Pakistan are in the crosshairs of an attack campaign that targets unpatched Microsoft Exchange Servers as an initial access vector to deploy the ShadowPad malware. Russian cybersecurity firm Kaspersky, which first detected the activity in mid-October 2021, attributed it to a previously unknown Chinese-speaking threat actor. Targets include