Yotam Gottesman, Security Researcher, enSilo

Yotam Gottesman, Security Researcher, enSilo

Unpacking junkie. A knack for reverse engineering only to re-engineer later. Ping me.

Command Injection/Elevation – Environment Variables Revisited

Vulnerabilities, Windows, code injection, elevation, command injection, UAC, variables, enSilo Breaking Malware

Windows environment variables can be used to run commands and can also be used to bypass UAC, allowing an attacker with limited privileges to take complete control of the system. This code leverages a rather unusual scenario within Windows OS.

This is a continuation of our research as described in a previous post: Elastic Boundaries – Elevating

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Adding UAC Bypass to the Attacker’s Tool Set

Research, Windows, Malware, UAC, enSilo Corporate and Product

Recently enSilo researchers, as part of our ongoing quest for endpoint protection, revealed a new way that attackers can bypass Microsoft’s User Access Control (UAC) mechanisms.

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Elastic Boundaries – Elevating privileges by environment variables expansion

Vulnerabilities, Windows, code injection, bypass UAC, elevation, environment variable, path redirect, UAC, variable expansion, enSilo Breaking Malware

Even though any process is provided with variables from its environment, they are often overlooked by users, developers and sometimes even the OS itself.

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Furtim: The Ultra-Cautious Malware

Research, Windows, Malware, Furtim, enSilo Corporate and Product

Furtim is the latest stealthy malware, found in the wild, and its discovery is credited to @hFireF0X. (We wrote more about Furtim malware here.)

Clearly, Furtim’s developers were more interested in keeping their malware hidden from security’s prying eyes than hitting more targets. With stealth a key component, we code-named this downloader

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Analyzing Furtim: Malware that Avoids Mass-Infection

Windows, Malware, Furtim, enSilo Breaking Malware


Recently we came across a new malware strain, first discovered by @hFireF0X, and at point of discovery, it was not detected by any of the 56 anti-virus programs tested by VirusTotal service. (We wrote more about Furtim malware here.)

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ArdBot: An Inside Look into Malware in the Making

Research, Windows, ArdBot, enSilo Corporate and Product

Crediting R136a1 who published malware samples a few days ago on a forum, we found these samples under development. We quickly went ahead and analyzed one, allowing us a unique view into malware at such an early development stage.

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ArdBot: A Malware Under Construction

Windows, Malware, ArdBot, enSilo Breaking Malware

Recently we came across a new sample of the ArdBot malware, appearing on kernelmode, credited to R136a1. We wrote more about ArdBot here.

A research of this sample showed a malware strain that is not yet ready for production use and provided an interesting peek inside a malware’s development process.

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A Technical Breakdown of ModPOS

Windows XP, Windows, Web Malware, POS malware, Malware, ModPOS, enSilo Breaking Malware

ModPOS is the latest in the string of POS malware that’s making the news. As its family name implies, this malware is intent on one: stealing credit card information.

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Moker, Part 2: Capabilities

Windows, Web Malware, Malware, APT, Moker, RAT, enSilo Breaking Malware

A few days ago, we published a blog entry on an advanced malware called Moker, and discussed the different challenges that Moker placed to avoid detection and anti-dissection, as part of enSilo’s continuing improvement of our endpoint security software.

Now that we have the stripped down malware sample, it’s time to analyze the actual malware.

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Moker: A new APT discovered within a sensitive network

Research, Windows, Malware, APT, Moker, RAT, enSilo Corporate and Product

Recently, enSilo found an Advanced Persistent Threat (APT) residing in a sensitive network of a customer. This APT appears to be a Remote Access Trojan (RAT) that is capable of taking complete control of the victim’s computer. To date, this APT is unknown and does not appear in VirusTotal. Moker was the file description that the malware author

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