Preface: The APT organization provides a hard-to-detect malware to attack other hostile campus.
Synopsis: The evasion technique found recently by security expert team is that APT 29 exploit the design weakness of detection machanism. They do a re-engineering to covert a zip file to JPEG. “This technique works because JPEG files are parsed from the beginning of the file and some Zip implementations parse Zip files from the end of the file (since the index is located there) without looking at the signature in the front,” the researchers explain.
Perhaps APT 28 and 29 using different evasion technique aim to delivery the malicious resources to landing. Whereby, the final executor is the power shell.
So called Zebrocy. Its function is mainly Downloader. The evasion effect is better than the technique use by APT 29. After running, it will perform a persistence operation and pop up an error message box to confuse the user. When it is started with specific parameters, a screenshot will be taken. Through the timer callback function, send data to the remote server and wait for the subsequent payload to be downloaded.
Should you disable PowerShell? No, minimize the risks with PowerShell Constrained Language mode.
Enabling Constrained Language mode ^ PS C:\Users\xxxx> $ExecutionContext.SessionState.LanguageMode = “ConstrainedLanguage”
This could be configured in registry HKLM\System\CurrentControlSet\Control\SESSION MANAGER\Environment__PSLockdownPolicy .
Running PS as Admin you can simple remove this property Remove-ItemProperty -path “HKLM:\SYSTEM\CurrentControlSet\Control\Session Manager\Environment\” -name __PSLockdownPolicy
Recommended article: PSLockDownPolicy and PowerShell Constrained Language Mode – https://docs.microsoft.com/en-us/archive/blogs/kfalde/pslockdownpolicy-and-powershell-constrained-language-mode
Preface: The Cybersecurity and Infrastructure Security Agency (CISA) and the Federal Bureau of Investigation (FBI) have identified a malware variant—referred to as BLINDINGCAN—used by North Korean actors.
Techincal details: Perhaps the official report already provide the details. In short, the key point is that APT group exploit the Microsoft Word vulnerability (CVE-2017-0199). As such, APT attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. The report described that malware will download [.]dll file from C&C server. The aim is to replace the local workstation iconcache[.]dll. Replace the iconcache[.]dll require privileges access right. So the specifics attack is targeting the machine which do not have patch installed. If it is successful. The unpack iconcache[.]dll will be transformed a variant of Hidden Cobra RAT.
Reference: Perhaps you have doubt that why do the cyber security organization aware the cyber attack in earlier phase. Does it a conspricy? They do a sniffing of your traffic? Or doing surveillance? No. they have several ways to protect the internet world. For example, relies on DNS Sink Hole activity record in service provider side, cyber crime activities reporting by computer users. Or, through alerts issued by law enforcement agencies, alerting of special types of cyber attacks from hostile entities.
Remedy: To prevent attacks, the agency recommends that US organizations update any Linux system to a version running kernel version 3.7 or later, “in order to take full advantage of kernel signing enforcement,” a security feature that would prevent APT28 hackers from installing Drovorub’s rootkit.
Reference: On older versions of Linux, two buffers allocated next to each other on the heap could result in the first buffer overwriting the second buffer’s metadata. By setting the in-use bit to zero of the second buffer and setting the length to a small negative value which allows null bytes to be copied, when the program calls free() on the first buffer it will attempt to merge these two buffers into a single buffer.
Impact: Heap overflows to gain arbitrary code execution.
Preface: In 2017, Honeypot detected that malware spread a new payload targeting 60001 TCP port. The ultimate goal is the JAWS Web Server & MVPower DVR. It turns out that there will be a Shell Command Execution vulnerability. Security expert has doubt on IoT device especially DVR which make use of TCP 60001 port.
Observation: There is an unknown malware ultimate goal to spread the remote access Trojan to IT world. Even though the authority Virus Total shows that only one vendor can correctly detect and isolate this malware (see attached picture). What’s going on?
Since there are many versions of Media Feature Pack nowadays. The fact is that the Media Feature Pack version that corresponds to your Windows OS build. So a lot of time the installer won’t copy ml.dll in place. As a result cyber criminal relies above matter to do a distribution a free copy of crafted ml.dll file on Internet for download.
After the loader has finished decrypting “svchost.dll”, the loader now has a decrypted version of Taidoor, which is a DLL. The loader then uses the API calls GetProcessHeap, GetProcAddress, and LoadLibrary to load the following DLLs, KERNEL32.dll, ADVAPI32.dll, and WS2_32.dll, which Taidoor will utilize.
Advises: – Maintain up-to-date antivirus signatures and engines. – Keep operating system patches up-to-date. – Scan all software downloaded from the Internet prior to executing.
Preface: It looks that who have vaccine of COVID-19 will be grant the dominance of the world.
Reference: DVC APIs will help you to implement modules on the server and client side of a Remote Desktop Services connection that communicate with each other.A remote code execution vulnerability exists in Remote Desktop Services. When an unauthenticated attacker connects to the target system using RDP and sends specially crafted requests,…… (CVE-2019-1182)
Description: Perhaps my research does not clearly reflect the actual status of the current malicious goal. However every people is looking for vaccine. My personal interest bring my attention to a malware so called “SOREFANG”. It looks that a vendor became a victim of this case. It was because attacker or APT group do a re-engineering their VPN software. As a matter of fact, their company footprint a large in China. The details of my observation and research are written down on attached diagram. For those who is interested. Please refer attached diagram for reference.
Highlight: Vendor announcement : The only vulnerable servers are the Sangfor servers running firmware versions M6.1 and M6.3R1. The statement revealed that other servers are clean and are not affected by the zero-day used by attacker.
Preface: Australia’s government and institutions are being targeted by ongoing sophisticated state-based cyber hacks, Prime Minister Scott Morrison says. Mr Morrison did not name specific cases but said it had spanned “government, industry, political organizations, education, health, essential service providers and operators of other critical infrastructure”. 19th June 2020
Technical details: Long story short. The nick name of this attack ‘Copy-Paste Compromises. It is derived from the cyber attacker heavy use of proof of concept exploit code, web shells and other tools copied almost identically from open source. For more details, please refer below link to download the report.
Attack highlights: Web shells are difficult to detect as they are easily modified by attackers and often employ encryption, encoding, and obfuscation. When a potential web shell is detected, administrators should validate the file’s origin and authenticity.
Recommendation: In normal circumstances, firewall locked down rule (deny any source to any destination) is hard to do the analytic through eyeball. But the attack vector designated to Australia. In order to avoid cyber attack in your firm. So firewall administrator should check their SIEM see whether it can find out the hints. If no such facility installed, Perhaps export the web server log see whether you can find out the attack activities details.
Preface: Baxter US, Caterpillar, Digi International, Hewlett Packard Enterprise, Intel, Rockwell Automation, Schneider Electric and Trek are impact by this vulnerability. There are more vendor which do not know the actual status.
Vulnerability details: An attacker from outside the network taking control over a device within the network, if internet facing. There are more ways to exploit this vulnerability, please refer below link for reference.
Root causes: The attacker exploit of the IP protocol flexibility. That is the incoming IPv4 fragments over an IP-in-IP tunnel. As we know, IPv4 found early than Internet services. At that period of time the most serious incident is merely virus infection to local machine. Machine to Machine communication will be make use of serial cable or Novell network. In short, it is a simple architecture. But the attacker can be exploit the design weakness engaging the cyber attack to digital world.
Preface: Universal Plug and Play (UPnP) is a set of networking protocols that permits networked devices, such as personal computers, printers, Internet gateways, Wi-Fi …
Review historical event: Mirai is an IoT botnet that was designed to exploit vulnerabilities in IoT devices for use in large-scale DDoS attacks.In September 2016, the Mirai malware launched a DDoS attack. A massive attack causes the domain registration services provider (Dyn) interrupted the services in October 2016.
Design weakness on universal plug and play: The Open Connectivity Foundation UPnP specification before 2020-04-17 does not forbid the acceptance of a subscription request with a delivery URL on a different network segment than the fully qualified event-subscription URL, aka the CallStranger issue.
Concerns by security expert: The attacker can send a specially crafted HTTP SUBSCRIBE request to the vulnerable devices. Meanwhile, An it could utilize this vulnerability to conduct a DDoS attack. For more details, please refer offical articles in the following url – https://www.kb.cert.org/vuls/id/339275
Preface: It is impossible to rely on small group of expert to track malicious activities on the Internet. In fact, it needs strong financial support. This is reality, maybe this is a long-running game.
Background: US Homeland Security issue an evaluation article on hostile country malware and phishing attacks motion. Perhaps you may ask? Can it be relies on SIEM do this monitoring. My opinion is that we should say thanks to DNS Sinkhole.A website that hosts malware can either attempt to trick users into downloading a malicious program, or execute a drive-by download: a download of a malicious piece of software that is automatically triggered when the webpage loads. But it require DNS lookup service. By using the DNS sinkhole technique it is also possible to deny access to any of malicious C&C websites. Besides, the queries will be written down to DNS Sinkhole record.
Security focus of specifics malware: COPPERHEDGE, is described as a Remote Access Tool (RAT). TAINTEDSCRIBE is a trojan that acts as a full-featured beaconing implant with command modules and designed to disguise as Microsoft’s Narrator. PEBBLEDASH is yet another trojan acting like a full-featured beaconing implant and used by hacking groups “to download, upload, delete, and execute files; enable Windows CLI access; create and terminate processes; and perform target system enumeration.”