<div dir="ltr"><div dir="ltr"><div dir="ltr" class="gmail_signature"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><a href="https://www.securityweek.com/attackers-are-landing-email-inboxes-without-need-phish">https://www.securityweek.com/attackers-are-landing-email-inboxes-without-need-phish</a></div><div dir="ltr"><span style="font-family:"trebuchet ms",geneva;font-size:medium"><br></span></div><div dir="ltr"><span style="font-family:"trebuchet ms",geneva;font-size:medium">We’ve all heard the proverb: </span><em style="font-family:"trebuchet ms",geneva;font-size:medium">Give a man a fish and you feed him for a day. Teach a man to fish and you feed him for a lifetime</em><span style="font-family:"trebuchet ms",geneva;font-size:medium">. Well now, threat actors don’t even have to exert the effort to phish to land business email accounts. </span><br></div><div dir="ltr">
<p><span style="font-size:medium"><span style="font-family:"trebuchet ms",geneva">According
to an alert published earlier this year by the FBI, Business Email
Compromise (BEC) and Email Account Compromise (EAC) have<a href="https://www.securityweek.com/bec-scam-losses-top-12-billion-fbi"> caused $12 billion in losses</a>
since October 2013. Traditionally, social engineering and intrusion
techniques have been the most common ways to gain access to business
email accounts and dupe individuals to wire funds to an
attacker-controlled account. These methods play out as follows:</span></span></p>
<p><span style="font-size:medium"><span style="font-family:"trebuchet ms",geneva"><strong>1. Social engineering and email spoofing</strong>:
Attackers will use social engineering to pose as a colleague or
business partner and send fake requests for information or the transfer
of funds. These emails can be quite convincing as the attacker makes a
significant effort to identify an appropriate victim and register a fake
domain, so that at first glance the email appears to belong to a
colleague or supplier. </span></span></p>
<p><span style="font-size:medium"><span style="font-family:"trebuchet ms",geneva"><strong>2. Account takeover</strong>:
Here, attackers use information-stealing malware and key loggers to
gain access to and hijack a corporate email account, which they then use
to make fraudulent requests to colleagues, accounting departments and
suppliers. They can also alter mailbox rules so that the victim’s email
messages are forwarded to the attacker, or emails sent by the attacker
are deleted from the list of sent emails. </span></span></p>
<p><span style="font-size:medium"><span style="font-family:"trebuchet ms",geneva">These
techniques have served threat actors well for quite some time. But now
we are seeing new, more expeditious methods emerge to gain access to
business email accounts. Compromised credentials being offered on
criminal forums, exposed through third-party compromises, or vulnerable
through misconfigured backups and file sharing services, make the
opportunity to profit from BEC easier than ever. Email inboxes are also
being used not just to request wire transfers, but to steal
financially-sensitive information stored within these accounts or to
request information from other employees. With declining barriers to
entry for BEC, and more ways to monetize this type of fraud, we can
expect the losses to continue to rise and perhaps even accelerate in the
near term.</span></span></p>
<p><span style="font-size:medium"><span style="font-family:"trebuchet ms",geneva">Here’s how these alternative methods work:</span></span></p>
<p><span style="font-size:medium"><span style="font-family:"trebuchet ms",geneva"><strong>1. Paying for access</strong>.
It’s common for accounts to be shared and sold across criminal forums,
and the emails of finance departments and CEO/CFOs are no exception.
It’s even possible to outsource this work to online actors who will
acquire company credentials for a percentage of earnings or a set fee
beginning as low as $150.</span></span></p>
<p><span style="font-size:medium"><span style="font-family:"trebuchet ms",geneva"><strong>2. Getting lucky with previously compromised credentials</strong>. As I’ve <a href="https://www.securityweek.com/cyber-risk-mixing-business-pleasure">discussed before</a>,
individuals will often reuse passwords across multiple accounts. In our
research we’ve detected more than 33,000 finance department email
addresses exposed within our own third-party data breach repository 83
percent of which had passwords associated. With many email and password
combinations of finance department email accounts already compromised,
cybercriminals can get lucky.</span></span></p>
<p><span style="font-size:medium"><span style="font-family:"trebuchet ms",geneva"><strong>3. Searching across misconfigured archives and file stores</strong>.
Inboxes, particularly those of finance departments and CEO/CFOs, are
replete with financially-sensitive information such as contract scans,
purchase orders, and payroll and tax documents. This information can be
used for fraud or re-sold on forums and marketplaces. The sad reality is
that there’s no need to go to a dark web market when sensitive <a href="https://www.securityweek.com/picture-now-protect-it">data is available for free on the open web</a>.
Employees and contractors sometimes turn to easy, rather than secure,
ways of archiving their emails. We identified that more than 12.5
million email archive files and 50,000 emails that contained “invoice”,
“payment” or “purchase order” have been exposed due to unauthenticated
or misconfigured file stores.</span></span></p>
<p><span style="font-size:medium"><span style="font-family:"trebuchet ms",geneva">Regardless of the method attackers use to perform a BEC scam, these seven security measures can help to mitigate the risks. </span></span></p>
<p style="padding-left:30px"><span style="font-size:medium"><span style="font-family:"trebuchet ms",geneva">1. Update
your security awareness training content to include the BEC scenario.
This should be a part of new hire training, but you should conduct
ad-hoc training for this scenario now. </span></span></p>
<p style="padding-left:30px"><span style="font-size:medium"><span style="font-family:"trebuchet ms",geneva">2. Build
BEC into your contingency plans, just as you have built ransomware and
destructive malware into your incident response/business continuity
planning.</span></span></p>
<p style="padding-left:30px"><span style="font-size:medium"><span style="font-family:"trebuchet ms",geneva">3. Work
with your wire transfer application vendors to build in manual controls
as well as multiple person authorizations to approve significant wire
transfers.</span></span></p>
<p style="padding-left:30px"><span style="font-size:medium"><span style="font-family:"trebuchet ms",geneva">4. Monitor
for exposed credentials. This is crucial for your finance department
email, but it’s important for all user accounts. Multifactor
authentication will also increase the difficulty for attackers to
perform account takeovers. </span></span></p>
<p style="padding-left:30px"><span style="font-size:medium"><span style="font-family:"trebuchet ms",geneva">5. Conduct
ongoing assessments of your executives’ digital footprints. You can
start with using Google Alerts to track new web content related to them.</span></span></p>
<p style="padding-left:30px"><span style="font-size:medium"><span style="font-family:"trebuchet ms",geneva">6. Prevent
email archives from being publicly exposed. For services like Server
Message Block (SMB), rsync and the File Transfer Protocol (FTP), use a
strong, unique password and disable guest or anonymous access and
firewall the port off from the Internet. If it needs to be on the
Internet or without a password, then make sure you whitelist the IPs
which are expressly permitted to access the resource.</span></span></p>
<p style="padding-left:30px"><span style="font-size:medium"><span style="font-family:"trebuchet ms",geneva">7. Be
aware of the risks of contractors who back up their emails on Network
Attached Storage (NAS) devices. Users should add a password and disable
guest/anonymous access, as well as opt for NAS devices that are secured
by default. Ideally, organizations should provide training on the risks
of using home NAS drives, as well as offer backup solutions so that
contractors and employees don’t feel the need to backup their devices at
home.</span></span></p>
<p><span style="font-size:medium"><span style="font-family:"trebuchet ms",geneva">BEC
is becoming increasingly profitable for threat actors as organizations
are making it easy for adversaries to gain access to the valuable
information that sits within these inboxes. However, with the right
combination of people, processes and technology, organizations can
mitigate the risk.</span></span></p><br clear="all"><div><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><b><span style="font-size:10pt"></span></b><span style="font-size:10pt"></span><span style="font-family:arial,helvetica,sans-serif"></span><br><br></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div>