This New Malware Family Using CLFS Log Files to Avoid Detection

Cybersecurity researchers have disclosed details about a new malware family that relies on the Common Log File System CLFS to hide a second-stage payload in registry transaction files in an attempt to evade detection mechanisms. FireEye's Mandiant Advanced Practices team, which made the discovery...

Detecting Embedded Content in OOXML Documents

On Advanced Practices, we are always looking for new ways to find malicious activity and track adversaries over time. Today we’re sharing a technique we use to detect and cluster Microsoft Office documents—specifically those in the Office Open XML OOXML file format. Additionally, we’re releasing ...

Detecting Post-Compromise Threat Activity Using the CHIRP IOC Detection Tool

Summary Updated April 15, 2021: The U.S. Government attributes this activity to the Russian Foreign Intelligence Service SVR. Additional information may be found in astatement from the White House. For more information on SolarWinds-related activity, go to...

Webshells Observed in Post-Compromised Exchange Servers  

CISA has added two new Malware Analysis Reports MARs to Alert AA21-062A: Mitigate Microsoft Exchange Server Vulnerabilities. Each new MAR AR21-084A and AR21-084B identifies a webshell observed in post-compromised Microsoft Exchange Servers. After successful exploiting a Microsoft Exchange Server...

Why master YARA: from routine to extreme threat hunting cases. Follow-up

On 3rd of September, we were hosting our "Experts Talk. Why master YARA: from routine to extreme threat hunting cases", in which several experts from our Global Research and Analysis Team and invited speakers shared their best practices on YARA usage. At the same time, we also presented our new...

IRFuzz - Simple Scanner with Yara Rule

IRFuzz is a simple scanner with yara rules for document archives or any files. Install 1. Prerequisites Linux or OS X Yara: just use the latest release source code, compile and install it or install it via pip install yara-python Yara Rules - You may download yara rules from here or import your...

CB TAU Threat Intelligence Notification: Winnti Malware 4.0

Winnti is a family of malware used by multiple Chinese threat actors like APT41. Carbon Black’s Threat Analysis Unit TAU is providing this technical analysis, YARA rules, IOCs and product rules for the research community. Behavioral Summary Winnti malware is installed manually with stolen...

PEpper - An Open Source Script To Perform Malware Static Analysis On Portable Executable

An open source tool to perform malware static analysis on P ortable E xecutable Installation eva@paradise:$ git clone https://github.com/Th3Hurrican3/PEpper/ eva@paradise:$ cd PEpper eva@paradise:$ pip3 install -r requirements.txt eva@paradise:$ python3 pepper.py ./malwaredir Screenshot...

PasteHunter - Scanning Pastebin With Yara Rules

PasteHunter is a python3 application that is designed to query a collection of sites that host publicly pasted data. For all the pasts it finds it scans the raw contents against a series of Yara rules looking for information that can be used by an organisation or a researcher. For setup...

Python-Iocextract - Advanced Indicator Of Compromise (IOC) Extractor

Advanced Indicator of Compromise IOC extractor. Overview This library extracts URLs, IP addresses, MD5/SHA hashes, email addresses, and YARA rules from text corpora. It includes some encoded and "defanged" IOCs in the output, and optionally decodes/refangs them. The Problem It is common practice...

Project TajMahal – a sophisticated new APT framework

Executive summary 'TajMahal' is a previously unknown and technically sophisticated APT framework discovered by Kaspersky Lab in the autumn of 2018. This full-blown spying framework consists of two packages named 'Tokyo' and 'Yokohama'. It includes backdoors, loaders, orchestrators, C2...

CB TAU Threat Intelligence Notification: Hunting APT28 Downloaders

Recently the Carbon Black Threat Analysis Unit TAU analyzed the APT28 downloaders SedUploader and Zebrocy which has been observed over the previous six months. There have been several good publications regarding the code analysis of SedUploader and Zebrocy already 125679. Therefore, in this artic...

Partner Perspectives: Notes from the Field: Extending Carbon Black Visibility to Undetected Malware

Daniel LaVoie is a Senior Solutions Specialist at ReversingLabs. On a recent customer visit, I asked the company’s Director of Security Operations how ReversingLabs came to be deployed as a part of their SOC tool set. The answer was quite interesting, and one that I wanted to share with our blog...

FindYara - IDA Python Plugin To Scan Binary With Yara Rules

Use this IDA python plugin to scan your binary with yara rules. All the yara rule matches will be listed with their offset so you can quickly hop to them! All credit for this plugin and the code goes to David Berard @p0ly This plugin is copied from David's excellent findcrypt-yara plugin. This...

Mquery - YARA Malware Query Accelerator (Web Frontend)

Ever had trouble searching for particular malware samples? This project is an analyst-friendly web GUI to look through your digital warehouse. mquery can be used to search through terabytes of malware in a blink of an eye: Thanks to the UrsaDB database, queries on large datasets can be extremely...

Collecting & Hunting For IOCs With Gusto and Style: rastrea2r

Ever wanted to turn your AV console into an Incident Response & Threat Hunting machine? Rastrea2r pronounced “rastreador” – hunter- in Spanish is a multi-platform open source tool that allows incident responders and SOC analysts to triage suspect systems and hunt for Indicators of Compromise IOCs...

MalScan - A Simple PE File Heuristics Scanners

MalScan is a simple PE File Heuristics Scanners written in python that you can use to quickly analyze a PE file and find out whether anything suspicious exists. It is a simple tool so doesn't offers much fancy features. You are free to extend it or do whatever you want with it. Things Supported...

Simple IOC and Incident Response Scanner: Loki

LOKI is a free and simple IOC scanner, a complete rewrite of main analysis modules of our full featured APT Scanner THOR. IOC stands for „Indicators of Compromise“. These indicators can be derived from published incident reports, forensic analyses or malware sample collections in your Lab. LOKI...

How public-private partnerships can combat cyber adversaries

For several years now, policymakers and practitioners from governments, CERTs, and the security industry have been speaking about the importance of public-private partnerships as an essential part of combating cyber threats. It is impossible to attend a security conference without a keynote...

IT threat evolution Q3 2017

Targeted attacks and malware campaigns Re-enter the dragon In July, we reported on the recent activities of a targeted attack group called 'Spring Dragon' also known as LotusBlossom, whose activities data back to 2012. Spring Dragon makes extensive use of spear-phishing and watering-hole attacks...