Tuesday, January 31, 2017

Cisco Coverage for Shamoon 2

Shamoon is a type of destructive malware that has been previously associated with attacks against the Saudi Arabian energy sector we've been tracking since 2012. We've observed that a variant of Shamoon, identified as Shamoon 2, has recently been used against several compromised organizations and institutions. Talos is aware of the recent increase in Shamoon 2 activity and has responded to ensure our customers are protected. Additionally, Talos will continue to monitor for new developments to ensure our customers remain protected.

Propagation

Shamoon 2 has been observed targeting very specific organizations and propagating within a network via network enumeration and the use of stolen credentials. Some of the credentials are organization specific from individuals or shared accounts. Other credentials are the default accounts of products used by the targeted customers.

Monday, January 30, 2017

EyePyramid: An Archaeological Journey

This post authored by Mariano Graziano and Paul Rascagneres

Summary


The last few days a malware sample named EyePyramid has received considerable attention, especially in Italy. The Italian police have arrested two suspects and also published a preliminary report of the investigation. This malware is notable due to the targeting of Italian celebrities and politicians.

We conducted our analysis on one of the first public samples attributed to EyePyramid. Sources in the security community have described this malware campaign as unsophisticated, and the malware samples involved as uninteresting. However Talos was intrigued to determine just how EyePyramid managed to stay hidden under-the-radar for years.

Friday, January 27, 2017

Matryoshka Doll Reconnaissance Framework

This post authored by David Maynor & Paul Rascagneres with the contribution of Alex McDonnell and Matthew Molyett


Overview

Talos has identified a malicious Microsoft Word document with several unusual features and an advanced workflow, performing reconnaissance on the targeted system to avoid sandbox detection and virtual analysis, as well as exploitation from a non-embedded Flash payload. This document targeted NATO members in a campaign during the Christmas and New Year holiday. Due to the file name, Talos researchers assume that the document targeted NATO members governments. This attack is also notable because the payload was swapped out with a large amount of junk data which was designed to create resource issues for some simplistic security devices.

Monday, January 23, 2017

Vulnerability Spotlight - LibBPG Image Decoding Code Execution

Discovered by Cisco Talos

Overview

Talos is disclosing TALOS-2016-0223 / CVE-2016-8710. An exploitable heap write out of bounds vulnerability exists in the decoding of BPG images in libbpg library. A crafted BPG image decoded by libbpg can cause an integer underflow vulnerability causing an out of bounds heap write leading to remote code execution. This vulnerability can be triggered via attempting to decode a crafted BPG image using libbpg.

Details

BPG (Better Portable Graphics) is an image format created in 2014 based on the HECV video compression standard. BPG has been praised for its ability to produce the same quality image as the well known JPEG format, but in a much smaller file size. Talos is disclosing the presence of a remote code execution vulnerability in the libbpg library which is widely used to support the file format. During the decoding of a BPG, in the `restore_tqb_pixels` function, an attacker controlled integer underflow can occur during the calculation of offsets for the `src` and `dst` operands of a `mempcy`. Because of the underflows, the resulting addresses passed to the `memcpy` are outside the bounds of the original heap structures, resulting in an out of bounds write condition. This vulnerability can be used to create a specially crafted BPG image file which results in remote code execution when opened with any application using a vulnerable version of the libbpg library. The full details surrounding the vulnerability are available here.

Friday, January 20, 2017

Vulnerability Spotlight: Adobe Acrobat Reader DC jpeg Decoder Vulnerability

Discovered by Aleksandar Nikolic of Cisco Talos

Overview

Talos is disclosing TALOS-2016-0259 / CVE-2017-2971 an uninitialized memory vulnerability in Adobe Acrobat Reader DC. Adobe Acrobat Reader is one of the largest and well known PDF readers available today. 

This particular vulnerability is associated with the JPEG Decoder functionality embedded in the application. A specially crafted PDF document containing a JPEG can be used to trigger this vulnerability which results in a heap-based buffer overflow which can be leveraged to achieve remote code execution. This issue has been resolved in the most recent patch provided by Adobe. The full details surrounding the vulnerability are available here.

Coverage

The following Snort Rules will detect exploitation attempts. Note that additional rules may be released at a future date and current rules are subject to change pending additional vulnerability information. For the most current rule information, please refer to your FireSIGHT Management Center or Snort.org.

Snort Rule: 41298 - 41305

Wednesday, January 18, 2017

Without Necurs, Locky Struggles

This post authored by Nick Biasini with contributions from Jaeson Schultz

Locky has been a devastating force for the last year in the spam and ransomware landscape. The Locky variant of ransomware has been responsible for huge amounts of spam messages being sent on a daily basis. The main driver behind this traffic is the Necurs botnet. This botnet is responsible for the majority of Locky and Dridex activity. Periodically Necurs goes offline and during these periods we typically see Locky activity decrease drastically. One of these periods is currently ongoing.

The number of active IP addresses on the SpamCop BL illustrates the current lack of Necurs activity

Vulnerability Spotlight: Multiple Code Execution Vulnerabilities in Oracle Outside In Technology

These vulnerabilities were discovered by Aleksandar Nikolic of Cisco Talos.

Summary


Oracle's Outside In Technology (OIT) is a set of SDKs that software developers can use to perform various actions against a large number of different file formats. According to the OIT website: "Outside In Technology is a suite of software development kits (SDKs) that provides developers with a comprehensive solution to extract, normalize, scrub, convert and view the contents of 600 unstructured file formats." Talos recently discovered vulnerabilities in the RTF and PDF parsers used by OIT that can be used to achieve arbitrary code execution on affected systems. Specially crafted files that leverage these parsers can be used to create conditions that could be leveraged by an attacker to obtain the ability to execute arbitrary code on affected systems.

Thursday, January 12, 2017

Vulnerability Spotlight: Exploiting the Aerospike Database Server

Vulnerabilities discovered by Talos

Talos is disclosing multiple vulnerabilities discovered in the Aerospike Database Server. These vulnerabilities range from memory disclosure to potential remote code execution. This software is used by various companies that require a high performance NoSQL database. Aerospike fixed these issues in  version 3.11.

The Aerospike Database Server is both a distributed and scalable NoSQL database that is used as a back-end for scalable web applications that need a key-value store. With a focus on performance, it is multi-threaded and retains its indexes entirely in ram with the ability to persist data to a solid-state drive or traditional rotational media. 

TALOS-2016-0264 (CVE-2016-9050) - Aerospike Database Server Client Message Memory Disclosure Vulnerability
TALOS-2016-0266 (CVE-2016-9052) - Aerospike Database Server Index Name Code Execution Vulnerability
TALOS-2016-0268 (CVE-2016-9054) - Aerospike Database Server Set Name Code Execution Vulnerability

Shadow Brokers Malware Coverage

The Shadow Brokers released what appears to be a series of windows rootkit components in a farewell message. The malware released included many Windows malware files that supposedly all trigger as either “equationdrug.generic” or “equationdrug.k”  by the Kaspersky security product.


The files are signed with the same key used previously for Equation Group malware which indicates that these files came from the same threat actor. Talos has convicted these files and will continue to monitor the situation for additional action.

Tuesday, January 10, 2017

Microsoft Patch Tuesday - January 2017

Happy New Year to our readers! Today marks the first Patch Tuesday of 2017 with Microsoft releasing their monthly set of bulletins designed to address security vulnerabilities. This month's release is relatively light with 4 bulletins addressing 3 vulnerabilities. Two bulletins are rated critical and address vulnerabilities in Office and Adobe Flash Player while the other two are rated important and address vulnerabilities Edge and the Local Security Authority Subsystem Service.

Bulletins Rated Critical

Microsoft bulletins MS17-002 and MS17-003 are rated critical.

MS17-002 addresses CVE-2017-0003, an arbitrary code execution vulnerability in Microsoft Office 2016. Specifically, Microsoft Word 2016 and Microsoft SharePoint Enterprise Server 2016 are affected. This vulnerability manifests in the way Office handles objects in memory. Exploitation of this flaw is achievable if, for example, a user opens a specifically crafted Word document received via email or downloaded from a site hosting a specifically crafted document.

Friday, January 6, 2017

Cisco Coverage for 'GRIZZLY STEPPE'

Over the past several weeks, there have been ongoing discussions regarding cyber attacks that have occurred against several political, governmental, and private sector entities in the United States. These discussions have revolved around allegations that these cyber attacks were designed to interfere with the 2016 U.S. Federal Elections as well as identifying who is responsible for these high-profile compromises. On December 29, 2016, the United States Department of Homeland Security (DHS) and Federal Bureau of Investigation (FBI) released a joint analysis report detailing some of the tools and infrastructure used by adversaries to compromise these institutions. The DHS-FBI joint report is referring to this activity as GRIZZLY STEPPE. Talos is aware of these discussions and reports of malicious activity associated with GRIZZLY STEPPE and has responded to ensure our customers are protected.

Coverage for GRIZZLY STEPPE is available through Cisco's security products, services, and open source technologies. The IP addresses listed in the DHS-FBI report have also been evaluated and applicable ones blacklisted. Note that Talos will continue to monitor for new developments to ensure our customers remain protected.