A highly recommended skim from BleepingComputer:
The BlueKeep remote code execution vulnerability in the Windows Remote Desktop Services is currently exploited in the wild. Vulnerable machines exposed to the web are apparently compromised for cryptocurrency mining purposes.

The attempts have been recorded by honeypots that expose only port 3389, specific for remote assistance connections via the Remote Desktop Protocol (RDP).

Attacks are not wormable

Security researcher Kevin Beaumont noticed on Saturday that multiple honeypots in his EternalPot RDP honeypot network started to crash and reboot. They’ve been active for almost half a year and this is the first time they came down. For some reason, the machines in Australia did not crash, the researcher noted in a tweet.

First details about BlueKeep being the cause of these events came from MalwareTech, who investigated the crash dumps from Beaumont’s machines. He said that he “found BlueKeep artifacts in memory and shellcode to drop a Monero Miner.”

According to early analysis from MalwareTech, an initial payload runs an encoded PowerShell command that downloads a second PowerShell script, also encoded. The researcher says that the final payload is a cryptocurrency miner, likely for Monero, currently detected by 25 out of 68 antivirus engines on the VirtusTotal scanning platform.

Talking to BleepingComputer, the researcher said that the malware may not be a worm but it is mass-exploiting the BlueKeep bug. This indicates that the cybercriminals are using a BlueKeep scanner to find vulnerable systems exposed on the web and drop the cryptocurrency miner on them.

In an update, MalwareTech says that analysis of the network traffic does not indicate self-propagation, meaning that the server doing the exploitation gets the target IP addresses from a predefined list.

Update: according to netflow it doesn’t appear to be self propagating, I assume a list of vulnerable IPs are being fed to a server which performs the exploitation.

— MalwareTech (@MalwareTechBlog) November 3, 2019

The first public BlueKeep exploit was added to Metasploit in September but scanners for the bug have been available before that date. MalwareTech’s analysis confirmed that the same code in the Metasploit module is also present in the malware.

It is likely that whoever is behind these attacks is using public resources and did not develop a reliable, wormable threat, as proved by Beaumont’s honeypot crashes.

A combination of cryptocurrency miner and a BlueKeep scanner was reported in July in a piece of malware called Watchbog, which typically focused on vulnerable Linux servers.

At the time, cybersecurity company Intezer said that integrating the scanner module for the RDP vulnerability alongside the Linux exploits “suggests that WatchBog is preparing a list of vulnerable systems to target in the future or to sell to third party vendors for profit.”

MalwareTech told us that the indicators of compromise Intezer provided for Watchbog do not seem to match the malware currently hitting machines vulnerable to BlueKeep.

These assaults generated over 26 million events on Beaumont’s honeypot infrastructure, which makes determining the indicators of compromise a more time consuming task. However, the researcher promised to sort through them for the relevant sequence and provide the data.

Brief BlueKeep history

BlueKeep (CVE-2019-0708) is a serious vulnerability that can allow malware to spread across connected systems without user intervention. Microsoft patched it on May 14, followed by a barrage of alerts about its severity from governments and security companies, some reiterating their concern.

Exploiting this RDP flaw for remote code execution (RCE) is not easy and the most common result of this endeavor is a crash of the target system. Security researchers that created a working exploit kept the details private to delay attackers creating their version and compromise still unpatched systems.

Two private exploit modules were developed in June and July, for Metasploit and CANVAS penetration testing tools. Both were hard to get as the former was private and the latter was delivered to subscribers that paid at least $32,480.

At the enterprise level, the worldwide update rate was 83% in June. However, this statistic did not count consumer machines. This suggests that the cybercriminals are likely hitting consumer computers.

The vulnerability does not affect all versions of Windows operating system. Microsoft’s advisory lists Windows 7, Windows Server 2008 R2, and Windows Server 2008.

Update [11/03/2019]: Article updated with information from MalwareTech’s analysis of the malware on Kryptos Logic blog

General Information

Executive Summary

Microsoft is releasing this security advisory to inform customers that an update to the Microsoft Malware Protection Engine addresses a security vulnerability that was reported to Microsoft. The vulnerability could allow denial of service if the Microsoft Malware Protection Engine scans a specially crafted file. An attacker who successfully exploited this vulnerability could prevent the Microsoft Malware Protection Engine from monitoring affected systems until the specially crafted file is manually removed and the service is restarted.

The Microsoft Malware Protection Engine ships with several Microsoft antimalware products. See the Affected Software section for a list of affected products. Updates to the Microsoft Malware Protection Engine are installed along with the updated malware definitions for the affected products. Administrators of enterprise installations should follow their established internal processes to ensure that the definition and engine updates are approved in their update management software, and that clients consume the updates accordingly.

Typically, no action is required of enterprise administrators or end users to install updates for the Microsoft Malware Protection Engine, because the built-in mechanism for the automatic detection and deployment of updates will apply the update within 48 hours of release. The exact time frame depends on the software used, Internet connection, and infrastructure configuration. Read More…

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Distributed Denial-of-Service attacks of the old already have mitigation steps being practiced by network professionals today. Internet service providers have disabled accepting ICMP echo requests, used ingress filtering for spoofed source address and have limited their opened ports. All of this mitigation affects only the network and transport layer of the OSI protocol stack.Плиты погреба

The techniques described above don’t work against bot threats which use a legitimate way in retrieving Internet resources. It does not spoof its source address, it does not send ICMP packets, and it does jordans for cheap not use ports other than the HTTP port. The attacks usually originate from a Cheap Ray Ban Sunglasses compromised machine with multiple threads or processes that connects to a website simultaneously.

The HTTP port is used by browsers to access a web page and this port sits on the application layer of the OSI protocol stack which does not have any established mitigation steps against DDoS attacks. The application layer is where data have been decapsulated or stripped of its transmission details between machines and protocols.

Mitigation steps against HTTP-based DDoS attack varies between internet service providers (ISPs) and network administrators. The reason behind this is because it is hard to distinguish legitimate traffic from an attack coming from a botnet. The botnet DDoS mimics an event that a flash crowd visitor creates.

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Companies serving DDoS defense also have services which involve packet scrubbing. This uses high performance network appliances and computers to inspect packets content and behavior before forwarding the packets to its destination. It hooks the website IP address and catches all the packets in the event of DDoS and inspects them of how they react to responses sent by the defense. If the connecting host is legitimately accessing the site, the packet is then forwarded to the באשלים hosting server.

In case the website is hosted via a web-hosting provider, the site owner does not Как have any access to the network devices to control and filter traffic. For the site owners on the budget, there have been proposed solutions that can be used by their site developers.

It involved the use of a reverse Turing test, which gives a challenge to the connecting hosts. One example of reverse Turing test is the use of CAPTCHA which contains Zuid-Afrika words or sound that humans can easily understand but not computers. When a source IP address tries to access a URL repeatedly within a short time frame, the challenge routine is triggered. If the machine does not reply or incorrectly answers, an HTTP 503 response (Service Unavailable) is always sent to the source IP address until the DDoS subsides. The Service Unavailable response is the cheapest way to send to a connecting host in terms of bandwidth.

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