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Double Duty: Dridex Banking Malware Delivered with RMS RAT

July 8, 2019 by Max Gannon in Threat Intelligence

Cofense IntelligenceTM analyzes millions of emails and malware samples each day to alert organizations to emerging phishing threats. Thanks to our expansive view of the threat landscape, we recently were able to discover and investigate a campaign impersonating eFax that appeared to have an attached Microsoft Word document. The attachment was a .zip archive which contained a .xls Microsoft Excel spreadsheet. This spreadsheet included an Office macro which, when enabled, was used to download and execute two malicious executables: samples of Dridex and Remote Manipulator System Remote Access Tool (RMS RAT). What’s notable: By delivering a banking trojan and a...

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Houdini Worm Transformed in New Phishing Attack

June 14, 2019 by Cofense in Threat IntelligencePhishing Defense CenterSEG MissesSymantec

By Nick Guarino and Aaron Riley The Cofense Phishing Defense Center™ (PDC)  and Cofense Intelligence™ have identified a new variant of Houdini Worm targeting commercial banking customers with campaigns containing either URLs, .zip, or .mht files. This new variant is named WSH Remote Access Tool (RAT) by the malware’s author and was released on June 2, 2019. Within five days, WSH RAT was observed being actively distributed via phishing. Figure 1 shows an example message from this campaign.

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Cofense Report: 90% of Verified Phish Found in Environments Using Email Gateways

June 10, 2019 by Cofense in Cyber Incident ResponseSEG Misses

By Kaustubh Jagtap Our recently released 2019 Phishing Threat and Malware Review highlights how perimeter protection technologies can’t stop all advanced phishing threats. Email gateways are a critical first line of defense, but as attackers have continued to innovate gateways haven’t kept up.  The CofenseTM report also underscores the importance of human intelligence to identify these advanced attacks once they make it past gateways. Trained users can effectively detect and report advanced phishing to allow SOC teams to accelerate incident response. Credential Phish Are the Most Common Threat 90% of verified phishing emails were found in environments using email gateways....

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The Zombie Phish Is Back with a Vengeance

June 4, 2019 by Milo Salvia in Phishing Defense CenterSEG MissesSymantec

Keep a close on your inboxes—the Zombie Phish is back and it’s hitting hard. Last October, on the eve of Halloween, the CofenseTM Phishing Defense CenterTM reported on a new phishing threat dubbed the Zombie Phish. This phish spreads much like a traditional worm. Once a mailbox’s credentials have been compromised, the bot will reply to long-dead emails (hence, Zombie) in the inbox of the infected account, sending a generic phishing email intended to harvest more victims for the Zombie hoard.

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New Phishing Attacks Use PDF Docs to Slither Past the Gateway

May 30, 2019 by Cofense in Cyber Incident ResponseMimecastSEG Misses

By Deron Dasilva and Milo Salvia Last week, the CofenseTM Phishing Defense CenterTM saw a new barrage of phishing attacks hiding in legitimate PDF documents, a ruse to bypass the email gateway and reach a victim’s mailbox. The attacks masquerade as a trusted entity, duping victims into opening what appears to be a trusted link, which in turn leads to a fake Microsoft login page. Once there, victims are tricked into providing their corporate login credentials.

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Patch or Pass? CVE-2017-11882 Is a Security Conundrum

May 29, 2019 by Max Gannon in Threat Intelligence

CISO Summary Since the latter part of 2018, threat actors have increasingly exploited two Microsoft vulnerabilities: CVE-2017-11882 and CVE-2018-0802. The first of these is especially popular. Cofense IntelligenceTM has seen it surge ahead of Microsoft macros as a favorite malware delivery method. CVE-2017-11882 is an older vulnerability that in fact has a patch. However, it presents a conundrum for security teams that haven’t addressed the problem. They can choose to skip the patching, live with the risks, and keep on using the legacy program. Or they can update, patch, and lose the application entirely to gain much better security. In...

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Fake Swiss Tax Administration Office Emails Deliver Retefe Banking Trojan

October 25, 2017 by Marcel Feller in Phishing Defense CenterMalware AnalysisPhishing

PhishMe®’s Phishing Defence Centre has observed multiple emails with a subject line that includes a reference to tax declarations in Switzerland (Original subject in German: “Fragen zu der Einkommensteuerklaerung”) as shown in Figure 1. The sender pretends to be a tax officer working for the tax administration (Eidgenoessische Steuerverwaltung ESTV) and is asking the victim to open the attached file to answer questions about the tax declaration.

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New Strain of Locky with a “Deadly” Twist

October 19, 2017 by Cofense in Phishing Defense CenterCyber Incident ResponseMalware Analysis

With it being flu season, no one wants to hear that a new strain of the flu has been discovered. Just as network defenders will not be excited that Locky ransomware has evolved yet again. This time however, threat actors decided to add a darker theme to code.  

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Malicious Chrome Extension Targets Users in Brazil

October 17, 2017 by Cofense in Phishing Defense CenterMalware AnalysisPhishing

Our Phishing Defense Center recently detected a significant increase in the number of emails with malware designed  exclusively to target users in Brazil.

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Heads Up: This Netflix Phish Targets Business Email, Not Just Home Accounts

October 10, 2017 by Cofense in Phishing Defense CenterMalware AnalysisPhishing

PhishMe® analyzes phishing attacks intended for corporate email all the time—phishing for corporate email credentials, malware delivery, etc. However, we also analyze phishing for consumer service credentials—think online shopping or Netflix—since it is also a part of the threat landscape.

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NanoCore Variant Delivered Through UUE Files

September 8, 2017 by Marcel Feller in Phishing Defense CenterMalware AnalysisPhishing

Over the past few weeks, our Phishing Defense Center has observed several emails with malicious PDF attachments that prompt the user to download a .UUE file from Dropbox. UUE files (Unix to Unix Encoding) are files encoded with uuencode, a program that converts binary files to text format for easy transfer while still allowing for the files to be easily opened using Winzip or similar un-archiving applications. When file extensions are not displayed in Windows, the downloaded file looks like any other compressed file (as shown in Figure 1), which makes it harder to spot that this file is indeed...

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Threat Actor Employs Hawkeye Malware with Multiple Infection Vectors

July 24, 2017 by Cofense in Phishing Defense CenterInternet Security AwarenessMalware Analysis

On July 13, 2017, the Phishing Defense Center reviewed a phishing campaign delivering Hawkeye, a stealthy keylogger, disguised as a quote from the Pakistani government’s employee housing society. Although actually a portable executable file [1], once downloaded, it masquerades its icon as a PDF. 

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Threat Actors Leverage CVE 2017-0199 to Deliver Zeus Panda via Smoke Loader

June 22, 2017 by Cofense in Malware AnalysisPhishingPhishing Defense Center

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.

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SMILE – New PayPal Phish Has Victims Sending Them a Selfie

June 15, 2017 by Cofense in Phishing Defense CenterMalware AnalysisPhishing

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.

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New Phishing Emails Deliver Malicious .ISO Files to Evade Detection

May 26, 2017 by Cofense in Malware AnalysisPhishingPhishing Defense Center

On May 22, 2017, PhishMe® received several emails with .ISO images as attachments via the Phishing Defense Center. ISO images are typically used as an archive format for the content of an optical disk and are often utilized as the installers for operating system. However, in this case, a threat actor leveraged this archive format as a means to deliver malware content to the recipients of their phishing email. Analysis of the attachments showed that this archive format was abused to deliver malicious AutoIT scripts hidden within a PE file that appears to be a Microsoft Office Document file, which...

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FBI Announces That BEC Scam Losses Continue to Skyrocket, as Losses Exceed $3.1B

May 19, 2017 by Cofense in Phishing Defense CenterMalware AnalysisPhishing

Financial losses from business email compromise (BEC) scams skyrocketed by 2,370% between January 2015 and December 2016, according to an FBI public service announcement released Thursday. The alarming statistic represents a sharp increase from the agency’s previous announcement, serving as a warning to users to stay vigilant in recognizing the threat.  

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