This vulnerability allows remote malicious users to execute arbitrary code on affected installations of Microsoft Exchange Server. Although authentication is required to exploit this vulnerability, the existing authentication mechanism can be bypassed. The specific flaw exists within the Powershell service. The issue results from the lack of proper validation of a access token prior to executing the Exchange PowerShell command. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of SYSTEM.
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Exbyte is the latest tool developed by ransomware attackers to expedite data theft from victims.
Posted: 21 Oct, 20228 Min ReadThreat Intelligence SubscribeFollowtwitterlinkedinExbyte: BlackByte Ransomware Attackers Deploy New Exfiltration ToolExbyte is the latest tool developed by ransomware attackers to expedite data theft from victims.Symantec’s Threat Hunter Team has discovered that at least one affiliate of the BlackByte ransomware (Ransom.Blackbyte) operation has begun using a custom data exfiltration tool during their attacks. The malware (...
Latest tools, tactics, and procedures being used by the Hive, Conti, and AvosLocker ransomware operations.
Posted: 28 Apr, 20228 Min ReadThreat Intelligence SubscribeFollowtwitterlinkedinRansomware: How Attackers are Breaching Corporate NetworksLatest tools, tactics, and procedures being used by the Hive, Conti, and AvosLocker ransomware operations.Targeted ransomware attacks continue to be one of the most critical cyber risks facing organizations of all sizes. The tactics used by ransomware attackers are continually evolving, but by identifying the most freq...
Introduction Knowledge is our best weapon in the fight against cybercrime. An understanding of how various gangs operate and what tools they use helps build competent defenses and investigate incidents. This report takes a close look at the history of the Cuba group, and their attack tactics, techniques and procedures. We hope this article will help you to stay one step ahead of threats like this one. Cuba ransomware gang Cuba data leak site The group’s offensives first got on our radar in lat...
Summary At the end of September, GTSC reported an attack on critical infrastructure that took place in August. During the investigation, experts found that two 0-day vulnerabilities in Microsoft Exchange Server were used in the attack. The first one, later identified as CVE-2022-41040, is a server-side request forgery (SSRF) vulnerability that allows an authenticated attacker to remotely trigger the next vulnerability – CVE-2022-41082. The second vulnerability, in turn, allows remote code exec...
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In brief If your Git operations start failing on Friday, August 13 with GitHub, it may well be because you're still using password authentication – and you need to change that. In December, the source-code-hosting giant warned it will end password-based authentication for Git pushes and the like. From 1600 UTC (1700 BST, 0900 PST) on Friday, that shutdown will come into effect. As such, you'll need to use authentication tokens to complete your Git operations with GitHub. "As previously announc...
Four flaws already being abused in the wild to compromise victims
Microsoft released an XL-sized bundle of security fixes for its products for this month's Patch Tuesday, and other vendors are close behind in issuing updates. The Windows goliath's batch for July has 117 patches, 13 for what's said to be critical bugs, 103 important, and one moderate. Normally, we'd encourage you to install these updates, testing them as appropriate prior to deployment, before miscreants develop exploits for them. However, four of these holes are already being exploited in the ...
Topics Security Off-Prem On-Prem Software Offbeat Vendor Voice Vendor Voice Resources Malicious cyber actors go after 2021's biggest misses, spend less time on the classics
Security flaws in Log4j, Microsoft Exchange, and Atlassian's workspace collaboration software were among the bugs most frequently exploited by "malicious cyber actors" in 2021 , according to a joint advisory by the Five Eyes nations' cybersecurity and law enforcement agencies. It's worth noting that 11 of the 15 flaws on the list were disclosed in 2021, as previous years' lists often found miscreants exploiting the older vulns for which patches had been available for years. Of course, the US Cyb...
Get our weekly newsletter Threat actor exploited known vulnerabilities in the Microsoft software to compromise multiple systems
An affiliate of the aggressive Hive ransomware group is exploiting known vulnerabilities in Microsoft Exchange servers to encrypt and exfiltrate data and threaten to publicly disclose the information if the ransom isn't paid. In a recent attack on an unnamed organization, the Hive affiliate rapidly compromised multiple devices and file servers by exploiting the ProxyShell vulnerabilities in Exchange servers, encrypting the data within 72 hours of the start of the attack, threat hunters with data...
Topics Security Off-Prem On-Prem Software Offbeat Vendor Voice Vendor Voice Resources Now that's sticker shock
Internet snoops has been caught concealing spyware in an old Windows logo in an attack on governments in the Middle East. The Witchetty gang used steganography to stash backdoor Windows malware, dubbed Backdoor.Stegmap, in the bitmap image. "Although rarely used by attackers, if successfully executed, steganography can be leveraged to disguise malicious code in seemingly innocuous-looking image files," researchers at Symantec's Threat Hunter Team wrote this week. "Disguising the payload in this ...
Topics Security Off-Prem On-Prem Software Offbeat Vendor Voice Vendor Voice Resources Now that's sticker shock
Internet snoops have been caught concealing spyware in an old Windows logo in an attack on governments in the Middle East. The Witchetty gang used steganography to stash backdoor Windows malware – dubbed Backdoor.Stegmap – in the bitmap image. "Although rarely used by attackers, if successfully executed, steganography can be leveraged to disguise malicious code in seemingly innocuous-looking image files," researchers at Symantec's Threat Hunter Team wrote this week. "Disguising the payload i...
Topics Security Off-Prem On-Prem Software Offbeat Vendor Voice Vendor Voice Resources Worok uses mix of publicly available tools, custom malware to steal info, gang active since 2020
A cyberespionage group has targeted government agencies and big-name corporations throughout Asia since at least 2020, using the notorious ProxyShell vulnerabilities in Microsoft Exchange to gain initial access. According to ESET, the crew it has dubbed as Worok may be associated with TA428, a similar group thought to be backed by China, that has been around since 2019. Threat intelligence researchers with the cybersecurity software vendor saw activity from a range of advanced persistent threat ...
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