Vulnerabilities / Threats

7/28/2017
05:30 PM
Connect Directly
Twitter
LinkedIn
RSS
E-Mail
50%
50%

Wannacry Inspires Worm-like Module in Trickbot

The malware is being primarily distributed via email spam in the form of spoofed invoices from an international financial services com, says Flashpoint.

The relative success that the authors of the WannaCry and NotPetya ransomware samples had in distributing their malware using a worm-like propagation method appears to be inspiring others to follow the same tack.

Security vendor Flashpoint this week reported discovering a new version of the Trickbot banking Trojan featuring a worm propagation module. The malware is being primarily distributed via email spam in the form of spoofed invoices from an international financial services company.

Once the malware infects a system it is designed to spread locally on the network via Server Message Block (SMB) shares. The new propagation module is rigged to scan an infected domain for vulnerable servers and computers via the NetServerEnum Windows API and Lightweight Directory Access Protocol (LDAP) enumeration.

So far, there has been no evidence of the modified version of Trickbot actually spreading via SMB shares. This suggests that the malware authors have not fully implemented the capability yet, Flashpoint security researcher Vitali Kremez, wrote in a blog this week.

According to Kremez, it is likely that the malware authors are testing how to equip Trickbot for lateral movement within a local area network with the goal of infecting more computers and co-opting them into a botnet.

News of the new worm-like module in Trickbot comes just days after Flashpoint warned that Trickbot, for the first time, was being used to target and infect customers of U.S. banks and financial institutions. Though Trickbot has been around since mid-2016 it has only targeted victims outside the U.S.

But since around the middle of July a new Trickbot spam campaign powered by the notorious Necurs botnet has begun targeting users in the US, United Kingdom, New Zealand, Canada, Denmark and several other countries.

The Necurs botnet is one of the world's largest botnets with up to one million infected Necurs bots being active at any time. The botnet has been around for several years and has been used to deliver a wide variety of malware. Recently it was tweaked to add a new component that allows it to be used for launching denial of service attacks.

Since July 17, there have been at least three Necurs botnet-powered spam waves that included Trickbot as the final payload, Flashpoint said.  The initial spam wave contained a spam email with a malicious Windows Script File attachment that purported to be from an Australian telecommunications company. More recent spam mails have evolved and involve spam emails with malicious macro-laden documents as attachments.

Related content:

 

Jai Vijayan is a seasoned technology reporter with over 20 years of experience in IT trade journalism. He was most recently a Senior Editor at Computerworld, where he covered information security and data privacy issues for the publication. Over the course of his 20-year ... View Full Bio

Comment  | 
Print  | 
More Insights
Comments
Oldest First  |  Newest First  |  Threaded View
More Than Half of Users Reuse Passwords
Curtis Franklin Jr., Senior Editor at Dark Reading,  5/24/2018
Is Threat Intelligence Garbage?
Chris McDaniels, Chief Information Security Officer of Mosaic451,  5/23/2018
Register for Dark Reading Newsletters
White Papers
Video
Cartoon Contest
Write a Caption, Win a Starbucks Card! Click Here
Latest Comment: This comment is waiting for review by our moderators.
Current Issue
Flash Poll
[Strategic Security Report] Navigating the Threat Intelligence Maze
[Strategic Security Report] Navigating the Threat Intelligence Maze
Most enterprises are using threat intel services, but many are still figuring out how to use the data they're collecting. In this Dark Reading survey we give you a look at what they're doing today - and where they hope to go.
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2018-11506
PUBLISHED: 2018-05-28
The sr_do_ioctl function in drivers/scsi/sr_ioctl.c in the Linux kernel through 4.16.12 allows local users to cause a denial of service (stack-based buffer overflow) or possibly have unspecified other impact because sense buffers have different sizes at the CDROM layer and the SCSI layer.
CVE-2018-11507
PUBLISHED: 2018-05-28
An issue was discovered in Free Lossless Image Format (FLIF) 0.3. An attacker can trigger a long loop in image_load_pnm in image/image-pnm.cpp.
CVE-2018-11505
PUBLISHED: 2018-05-26
The Werewolf Online application 0.8.8 for Android allows attackers to discover the Firebase token by reading logcat output.
CVE-2018-6409
PUBLISHED: 2018-05-26
An issue was discovered in Appnitro MachForm before 4.2.3. The module in charge of serving stored files gets the path from the database. Modifying the name of the file to serve on the corresponding ap_form table leads to a path traversal vulnerability via the download.php q parameter.
CVE-2018-6410
PUBLISHED: 2018-05-26
An issue was discovered in Appnitro MachForm before 4.2.3. There is a download.php SQL injection via the q parameter.