Threat Round Up for Nov 10 - Nov 17

Today, Talos is publishing a glimpse into the most prevalent threats we've observed between November 10 and November 17. As with previous round-ups, this post isn't meant to be an in-depth analysis. Instead, this post will summarize the threats we've observed by highlighting key behavior...

How to solve the Malwarebytes CrackMe: a step-by-step tutorial

The topic of this post is a Malwarebytes CrackMe—an exercise in malware analysis that I recently created. First, the challenge was created to serve internal purposes, but then it was released to the community on Twitter and triggered a lot of positive response. Thanks to all of you who sent in yo...

Using legitimate tools to hide malicious code

The authors of malware use various techniques to circumvent defensive mechanisms and conceal harmful activity. One of them is the practice of hiding malicious code in the context of a trusted process. Typically, malware that uses concealment techniques injects its code into a system process, e.g...

FLOSS - FireEye Labs Obfuscated String Solver (Automatically extract obfuscated strings from malware)

Rather than heavily protecting backdoors with hardcore packers, many malware authors evade heuristic detections by obfuscating only key portions of an executable. Often, these portions are strings and resources used to configure domains, files, and other artifacts of an infection. These key...

NET Debugger & Assembly Editor: dnSpy

dnSpy is a tool to reverse engineer .NET assemblies. It includes a decompiler, a debugger and an assembly editor and more and can be easily extended by writing your own extension. It uses dnlib to read and write assemblies so it can handle obfuscated assemblies eg. malware without crashing...

Using ILSpy to analyze a small adware file

My curiosity was triggered when the telemetry of our heuristic scanner started showing a multitude of reports about a small file called grandfather.exe, so I went out to grab a copy and have a look at it. As you can probably tell from some of the detection names at Virustotal, this is a MSIL...

EternalBlue Exploit Used in Retefe Banking Trojan Campaign

Criminals behind the Retefe banking Trojan have added a new component to their malware that uses the NSA exploit EternalBlue. The update makes Retefe the latest malware family to adopt the SMBv1 attack against a patched Windows vulnerability, and could signal an emerging trend, said researchers a...

DKMC - Malicious Payload Evasion Tool

Don't kill my cat is a tool that generates obfuscated shellcode that is stored inside of polyglot images. The image is 100% valid and also 100% valid shellcode. The idea is to avoid sandbox analysis since it's a simple "legit" image. For now the tool rely on PowerShell the execute the final...

CVE-2017-12840

A kernel driver, namely DLMFENC.sys, bundled with the DESLock+ client application 4.8.16 and earlier contains a locally exploitable heap based buffer overflow in the handling of an IOCTL message of type 0x0FA4204. The vulnerability is present due to the kernel driver failing to allocate sufficien...

CVE-2017-12840

A kernel driver, namely DLMFENC.sys, bundled with the DESLock+ client application 4.8.16 and earlier contains a locally exploitable heap based buffer overflow in the handling of an IOCTL message of type 0x0FA4204. The vulnerability is present due to the kernel driver failing to allocate sufficien...

CVE-2017-12840

CVE-2017-12840 describes a kernel-driver (DLMFENC.sys) included with DESLock+ client v4.8.16 and earlier that suffers a local heap-based buffer overflow when handling IOCTL 0x0FA4204. The vulnerability arises from failing to allocate enough memory for a user-supplied string, which is copied into ...

New multi platform malware/adware spreading via Facebook Messenger

One good thing about having a lot of Facebook friends is that you simply act as a honey pot when your friends click on malicious things. A few days ago I got a message on Facebook from a person I very rarely speak to, and I knew that something fishy was going on. After just a few minutes analyzin...

The Malicious Macro Generator!

PenTestIT RSS Feed I'm sure you remember my older post about the malicious office document generator and the office exploitation toolkit. Just a refresher - Luckystrike is the open source script that helps you create malicious Microsoft Office documents using PowerShell and MicroSploit is an open...

Invoke-CradleCrafter - PowerShell Remote Download Cradle Generator and Obfuscator

Invoke-CradleCrafter is a PowerShell v2.0+ compatible PowerShell remote download cradle generator and obfuscator. Purpose Invoke-CradleCrafter exists to aid Blue Teams and Red Teams in easily exploring, generating and obfuscating PowerShell remote download cradles. In addition, it helps Blue Team...

Threat Round-up for July 28 - August 4

Today, Talos is publishing a glimpse into the most prevalent threats we've observed between July 28 and August 04. As with previous round-ups, this post isn't meant to be an in-depth analysis. Instead, this post will summarize the threats we've observed by highlighting key behavior characteristic...

This Retail Website Considers Password Security Optional

Most gaping security holes are terrible mistakes. But for one major Hong Kong-based online retailer called Strawberrynet, its security shortcomings are a feature. Like many ecommerce sites, registered users have an option for express checkout. What makes beauty-products website Strawberrynet uniq...

Terror Evolved: Exploit Kit Matures

This post is authored by Holger Unterbrink and Emmanuel Tacheau Executive SummaryTalos is monitoring the major Exploit KitsEK on an ongoing basis. While investigating the changes we recently observed in the RIG EK campaigns, we identified another well known candidate: Terror Exploit Kit.Terror EK...

Session Hijacking, Cookie-Stealing WordPress Malware Spotted

Researchers have identified a strain of cookie stealing malware injected into a legitimate JavaScript file, that masquerades as a WordPress core domain. Cesar Anjos, a security analyst at Sucuri, a firm that specializes in WordPress security, came across the malware during an incident response...

PowerShell Payload Stager: PowerStager

PowerShell Payload Stager This script creates an executable stager that downloads a selected powershell payload, loads it into memory and executes it using obfuscated EC methods. The script will also encrypt the stager for dynamic signatures and some additional obfuscation. This enables the actua...

FIN7 Evolution and the Phishing LNK

FIN7 is a financially-motivated threat group that has been associated with malicious operations dating back to late 2015. FIN7 is referred to by many vendors as “Carbanak Group”, although we do not equate all usage of the CARBANAK backdoor with FIN7. FireEye recently observed a FIN7 spear phishin...