Fileless Malware Attacks and How To Fight Them! – Disposable mail news

It has been crystal clear over these years with the increase in a number of cyber-attacks of an equally unique kind making it almost impossible for the out-dated or conventional security mechanisms to intercept and fight.

As if a single one-of-a-kind cyber-attack tool wasn’t enough, the threat actors now are laden with polymorphic tactics up their sleeves. Per sources, an entirely new version of a threat could be created every time after infection.

After “polymorphism” became apparent, the vendors as per reports engineered “generic signatures” had numerous variants in them. But the cyber-cons always managed to slip in a new kind.

This is when the malware authors came up with a concept of fileless attacking. They fabricated malware that didn’t need files to infect their targets and yet caused equal damage.

Per sources, the most common fileless attacks use applications, software, or authorized protocol that already exists on the target device. The first step is a user-initiated action, followed by getting access to the target’s device memory which has been infected by now. Here the malicious code is injected via the exploitation of Windows tools like Windows Management Instrumentation and PowerShell.

Per reports, the Modus Operandi of a fileless attack is as follows:
It begins with a spam message which doesn’t look suspicious at all and when the unaware user clicks on the link in it they are redirected to a malicious website.
The website kicks-off the Adobe Flash.
That initiates the PowerShell and Flash employs the command line to send it instructions and this takes place inside the target device’s memory.
The instructions are such that one of them launches a connection with a command and control server and helps download the malicious PowerShell script which ferrets down sensitive data and information only to exfiltrate it later.

Researchers note that as these attacks have absolutely nothing to do with stocking malicious files onto the target’s device, it becomes more difficult for security products to anticipate or perceive any such attack because they are evidently left with nothing to compare the attacks with. The fact that files less malware can hide from view in the legitimate tools and applications makes it all the worse.

Recently lots of fileless attacks surfaced and researchers were elbow deep in analyzing them. According to sources, some well-known corporate names that faced the attacks include, Equifax that had a data breach via a command injection vulnerability, the Union Crypto Trader faced a remote code execution in the memory, the version used was a ‘trojanized’ form a legitimate installer file and the U.S. Democratic National Committee faced two threat actors used a PowerShell backdoor to automatically launch malicious codes.

These attacks are obviously disconcerting and require a different kind of approach for their prediction or prevention. A conventional security system would never be the solution corporates and organizations need to stand against such attacks.

Per sources, the Network Detection and Response (NDR) seem to be a lucrative mechanism for detecting uncommon malicious activities. It doesn’t simply count on signatures but uses a combination of machine learning tactics to fetch out irregular network behaviors. It perceives what is normal in a particular system, then tries to comprehend what isn’t normal and alerts the overseers.

Researchers think an efficient NDR solution takes note of the entire surrounding of a device including what is in the network, cloud deployments, in the IoT sections and not to mention the data storage and email servers.

Per sources, NDR gradually works up to its highest efficiency. Its and its sensors’ deployment takes a considerable amount of time and monitoring. But the final results encompass enhanced productivity, decreased false alerts, and heightened security.


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TrickBot Added New Stealthy Backdoor for High-Value Targets – Disposable mail news

The authors behind the infamous TrickBot malware – a modular banking trojan that targets sensitive financial information and also acts as a dropper for other malware–have developed a stealthy custom backdoor, circulating by the name ‘PowerTrick’, to monitor high-value targets and infiltrate them accordingly.

Statistics demonstrate that TrickBot is one of the top crimeware codes and cyberattack groups in existence currently. Developers behind TrickBot have made frequent upgradations in order to evade detection even fluently, empower its stealth, make it hard to research and let it bypass security configurations on user devices.

PowerTrick has been primarily created as an attempt to keep up with the fast paced era of constantly evolving defense mechanisms by effectively bypassing some of the most sophisticated security controls and highly secured networks of high value. Referencing from the statements given by SentinelLabs security researchers, Vitali Kremez, Joshua Platt and Jason Reaves on Thursday, “The end-goal of the PowerTrick backdoor and its approach is to bypass restrictions and security controls to adapt to the new age of security controls and exploit the most protected and secure air-gapped high-value networks.”

According to the analysis, PowerTrick is configured to carry out commands and send back the results in the Base64 format. It is injected as a follow-up module after the victim’s system has been infected by the TrickBot.

How does it work?

During the examinations, researchers discovered an initial backdoor script being sent out, at times draped as a Powershell task, it goes on to establish contact with command-and-control (C2) server. Once the contact has been successfully established, the authors send their very first command which leads to the downloading of the main PowerTrick backdoor. After the installation of the same, the malware starts executing common backdoor functions, it carries out check-in and then awaits further commands to act upon. Once received, it acts upon these commands and returns the results/errors.

“Once the system and network have been profiled, the actors either stealthily clean up and move on to a different target of choice, or perform lateral movement inside the environment to high-value systems such as financial gateways,” as per the SentinelLab analysis.

“TrickBot has shifted focus to enterprise environments over the years to incorporate many techniques from network profiling, mass data collection, incorporation of lateral traversal exploits,” researchers concluded.

“This focus shift is also prevalent in their incorporation of malware and techniques in their tertiary deliveries that are targeting enterprise environments, it is similar to a company where the focus will shift depending on what generates the best revenue.”


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Convert EXE to BAT Files – 10 minute mail

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exe2powershell is used to convert EXE to BAT files, the previously well known tool for this was exe2bat, this is a version for modern Windows.

exe2powershell - Convert EXE to BAT Files

This will convert any binary file (*.exe) to a BAT file, the resulting BAT file contains only echo commands followed by a PowerShell command to re-create the original binary file.

This kind of tool can be useful during a pen-test when you want to trigger a shell without any upload feature. With echo and PowerShell the auditor is able to upload any binary file to the target system.

This version is modernized from exe2bat to work with current Windows versions as exe2bat had some limitations:

  • Needs debug.exe available on the target computer (16-bit application which was removed in Windows 7 x64 but available in Windows 7 x86)
  • Limits input exe size to 64kB

exe2powershell replaces the need of debug.exe by using a PowerShell command line which is available on all Windows since Windows 7 / 2008 and there is no more limitation in input exe size.

Usage of exe2powershell to Convert EXE to BAT Files

You can download exe2powershell here:

exe2powershell-master.zip

Or read more here.


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