Our Phishing Defense Center identified and responded to attacks leveraging a relatively new Microsoft Office vulnerability during the past few weeks. Last week, the PDC observed threat actors exploiting CVE 2017-0199 to deliver the Smoke Loader malware downloader which in turn was used to deliver the Zeus Panda botnet malware. These emails claim to deliver an invoice for an “outstanding balance” and trick the recipient to opening the attached file. In one instance, we have also seen the malicious attachment being delivered via URL.
The Zyklon HTTP Botnet malware is a tool that is readily accessible to threat actors in online criminal marketplaces and has been observed in use for various criminal activities. Among its features is the ability to log the keystrokes typed by a victim as well as to collect other private or sensitive information, and one of the most notable uses for Zyklon has been as a downloader and delivery tool for the Cerber encryption ransomware. Over a dozen unique campaigns to deliver this malware have been identified and reported by PhishMe Intelligence and it represents one of the most rapidly-growing constituents on the threat landscape. Each time the Zyklon malware is identified, it has followed a relatively-straightforward and mainstream method for infecting victims. With only one exception, Zyklon has been delivered using Microsoft Word documents with hostile macro scripting used to deliver the botnet malware payload.
Leesburg, Virginia – June 16, 2017 – PhishMe® (cofense.staging.wpengine.com), the leading provider of human-focused phishing defense solutions, today announced that CEO and co-founder Rohyt Belani received the EY Entrepreneur Of The Year® 2017 Award in the Security category in the Mid-Atlantic region. The award recognizes entrepreneurs who are excelling in areas such as innovation, financial performance and personal commitment to their businesses and communities. Rohyt Belani was selected by an independent panel of judges, and the award was presented at a special gala event at the Ritz-Carlton, Tysons Corner in McLean, Virginia on June 15, 2017.
Leesburg, VA – June 16, 2017 – PhishMe Inc., the leading provider of human-phishing defense solutions, announced today that it has filed a second patent infringement lawsuit against Wombat Security Technologies, Inc. (“Wombat”) in the United States District Court for the District of Delaware. PhishMe’s complaint alleges that Wombat infringes PhishMe’s U.S. Patent Nos. 9,591,017 (the ’017 Patent) and 9,674,221 (the ’221 Patent). A copy of the complaint is available here. PhishMe previously initiated a patent infringement lawsuit against Wombat in 2016. In that lawsuit, which remains pending, PhishMe asserts that Wombat infringes U.S. Patent No. 9,398,038 (the ’038 Patent). In both lawsuits, PhishMe alleges that Wombat’s ThreatSim, PhishAlarm, and PhishAlarm Analyzer solutions illegally use PhishMe’s patented technology.
Phishing scams masquerading as PayPal are unfortunately commonplace. Most recently, the PhishMe Triage™ Managed Phishing Defense Center noticed a handful of campaigns using a new tactic for advanced PayPal credential phishing. The phishing website looks very authentic compared to off-the-shelf crimeware phishing kits, but also levels-up by asking for a photo of the victim holding their ID and credit card, presumably to create cryptocurrency accounts to launder money stolen from victims.
The TrickBot financial crimes and botnet malware has seen mild usage since its introduction in late 2016. While it is able to emulate many of the features that made the Dyre trojan so successful, many aspects of its deployment left it rough around the edges. Examples of this roughness like persistence via a scheduled Windows task named “Bot” limited this malware’s evasion and anti-forensic capabilities. Furthermore, previous deliveries leveraged relatively simplistic techniques such as relying on executables in archives attached to phishing emails securing new infections. However, with some very minor refinements to both the malware resident and delivery processes, threat actors have evidenced a renewed drive to explore the possibilities this malware tool has to offer. The exploration of malware technologies and delivery processes are both trends that have been previously addressed in PhishMe® reporting and, as threat actors continue to turn to commoditized delivery methods, will continue to evolve.
TrickBot is a robust financial crimes and botnet trojan that shares a number of characteristics with the infamous Dyre banking trojan. Despite sharing similar functionality, TrickBot is an approximation of Dyre, not an exact copy. While this extends to the theft of online banking credentials, this botnet tool is flexible enough to provide threat actors with the ability to adapt and customize their intrusion based on information collected about machines infected by TrickBot.
One of the most tenacious and recurring delivery methodologies featured within the current threat landscape is the combination of PDF documents with an embedded Microsoft Word document. This document in turn contains macro scripting used to download and deobfuscate an XOR-ciphered executable payload. A number of current top-tier malware varieties have been deployed using this methodology. Criminals delivering the Jaff encryption ransomware and before it the Locky encryption ransomware both harnessed this technique as have the Dridex threat actors. This technique is popular because it provides some advantages over using a PDF or Word document with macros alone. The first and most obvious is the appearance it presents to its recipients. While awareness of Word documents with macros has proliferated in recent years due to its prolific use in phishing attacks, by adding just one step, unprepared users can be convinced to engage with the infection method.
Figure 1 – PDF reader requests permission to extract and open a Word document as seen with Jaff, Locky, and Dridex
This technique has now been employed as a means of delivering the TrickBot malware along with a renewed use of standalone Office documents with macro scripting. The phishing emails delivering these infection utilities featured no message content, no narrative, and in some cases, no subject line. This employs a different social engineering technique that, rather than relying on persuasive argumentation, appeals to the recipient’s curiosity.
|Attachment Filename||MD5 Hash|
Figure 2 – Example indicators from campaigns using this attack method
However, this renewed threat actor utilization also brings a very subtle refinement to the overall polish of the TrickBot deployment intended to improve its rate of successful infection as well as its likelihood to persist undetected on infected endpoints. The TrickBot malware relies on a Windows Task to ensure its persistence within infected environments. This task is defined by an XML file written to disk after TrickBot is initially run. Early examples of this persistence task were named “Bot” and would show up as such during audits of system tasks. However, this most recent iteration of task from “Bot” to the much less obvious “services update”. While this refinement may seem insignificant, it portends a much more serious approach on the part of the threat actor. One of these two filenames would look entirely out of place within an infected environment while the latter would be more reasonable–perhaps reasonable enough to escape detection.
Figure 3 – An excerpt from the “services update” Windows task
This renewed interest and exploration into distribution of the TrickBot malware comes with a handful of refinements in delivery and persistence. By harnessing a successful distribution methodology and refining their persistence mechanism, criminals using TrickBot are attempting to take their success using this botnet malware to another level. The challenge for security professionals is to develop a comprehensive defense against these improvements. The best approach is to combine tactical observations and atomic indicators with a strategic view of threat actors’ goals. Ultimately, defenders should not focus on just one attack vector or malware tool, but instead should anticipate the strategy threat actors use to accomplish their mission. In many cases, this mission is predicated upon the success of phishing emails.
Understanding how attackers craft and deploy these emails allows an organization to prepare and empower the email users within their organization. These users can then engage critically with those messages and, when a suspicious email is detected, report it to the security and incident responders defending the enterprise. These internal reports can then be compared to and combined with external sources to help network defenders overcome threats at a tactical level and apply those tactics as part of a greater strategy to overcome any phishing threat.
Learn about emerging trends and evolving threats in phishing malware with PhishMe’s Q1 Malware report, click here to download.
PhishMe Simulator and PhishMe Reporter Recognised
LONDON, UK – 13th June 2017 – PhishMe® Inc., the leader in human phishing defence solutions, is pleased to announce that PhishMe SimulatorÔ and PhishMe Reporter® were recognised by a panel representing the audience of SC Media, as the winning solutions in the Best Professional Training or Certification Programme category at the 2017 SC Awards Europe. The announcement was made Tuesday, 6th June at the awards presentation held at Old Billingsgate, London.
Beginning today, we’re offering a complimentary, computer-based training module covering the European Union’s recent General Data Protection Regulation (GDPR) as part of our PhishMe CBFree™ package to help support companies throughout the UK and Europe that are required to comply.