Ransom Attacks: To Believe or Not To Believe


Apparently, ransom cyber threats are not only about encrypting files. Over the past week, there has been an exponential increase in DDoS for ransom threats. This is an increasingly popular tactic of extortion and financial gain for hackers and hacktivists alike.

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Background

Apparently, ransom cyber threats are not only about encrypting files. Over the past week, there has been an exponential increase in DDoS for ransom threats. This is an increasingly popular tactic of extortion and financial gain for hackers and hacktivists alike - "if payment isn't received, a cyber-attack will be launched that can result in damaged reputation and lost customers/revenue."

This method was initially introduced by DD4BC and replicated by the Armada Collective in late 2015. Armada accompanied their ransom notes with a short "demo" attack. When the time for payment expired, Armada took down the victims' data centers with traffic volumes typically exceeding 100Gbps.

(Case study - How Swiss email provider Protonmail overcame a sophisticated DDoS ransom attack).

The Armada Collective's attacks were gradual and methodical and achieved high success rates. Consequently, many hacking groups now imitate this modus operandi and spread similar ransom threats while the major groups continue to launch their threats and attacks.

Handling a Ransom Note

Although it is almost impossible to determine whether a ransom note comes from a competent, experienced hacker group or an amateur unit - some units emerged under the guise of a notorious DDoS for ransom group – do not decry a ransom note. While these fake groups send emails nearly identical to real ransom letters, there are a number of indicators to distinguish between the two:

  1. The fake groups often request a different amount of money
  2. "Real" groups prove their competence; fake groups exclude the "demo" attack
  3. These groups do not have official accounts, websites or target lists
  4. When hackers launch a real ransom attack, they normally target many companies under the same industry (see the ProtonMail case study)
  5. Look for suspicious indicators (see figure 5 below)

It is recommended to have several experts examining the ransom letters in order to ascertain its origin.

Delivery Methods

The main delivery method from a DDoS for ransom group is via email. There are exceptions to this rule however. Recently, the group ezBTC Sqaud attempted to run a ransom campaign using a Twitter account to deliver their ransom note. Below are just a few examples an organization could experience when being targeted by a ransom campaign.

Email


Figure 1: DDoS Threat Message by "Reddoor"

Twitter


Figure 2: DDoS Threat Message by "EzBTC" Squad

 

DDoS Threat Messages by "Armada Collective"


Figure 3: Real


Figure 4: Fake


Figure 5: Fake ransom threat by "Lizard Squad" impostors

On April 28th, ransom letters from a group claiming to be Lizard Squad were issued.  These emails came from the domain, lzqsec.com, a domain that was created the same day.

Ransom DDoS Groups

  • DD4BC
  • Armada Collective
  • RedDoor
  • ezBTC Squad
  • Delivery Methods

Targeted Industries

  • Financial
  • E-Commerce
  • Web services
  • Retail

Attack Vectors

Most of these DDoS for ransom groups are running their own network stressers, however some leverage publicly available stressers to conduct their campaigns. When experiencing a DDoS for ransom attack, expect +100Gbps and multi-vector attacks simultaneously. The attack is likely to be persistent and last for days. Attack vectors include floods using the following protocols:

  • SSDP
  • NTP
  • DNS
  • UDP
  • TCP RST
  • TCP SYN
  • SYN Flood
  • SYN ACK
  • SSYN
  • ICMP

Full list of DDoS tools and techniques at Radware's DDoSPedia

Organizations Under Attack Should Consider

  • A security solution that can protect its infrastructure from multi-vector attacks including protection from network and application based DDoS attacks as well as volumetric attacks that can saturate the Internet pipe
  • A hybrid solution that includes on-premise detection and mitigation with cloud-based protection for volumetric attacks. This provides quick detection, immediate mitigation and protects networks from volumetric attacks that aim to saturate the Internet pipe.
  • A solution that provides protection against sophisticated web-based attacks and website intrusions to prevent defacement and information theft.
  • A cyber-security emergency response plan that includes an emergency response team and process in place. Identify areas where help is needed from a third party.
  • Monitor security alerts and examine triggers carefully. Tune existing policies and protections to prevent false positives and allow identification of real threats if and when they occur.

In addition, we recommend inspecting and patching your network often is necessary in order to defend against these types of risks and threats as they evolve.

Under Attack and in Need of Expert Emergency Assistance?

Radware offers a full range of solutions to help networks properly mitigate attacks similar to these. Our attack mitigation solutions provide a set of patented and integrated technologies designed to detect, mitigate and report todays most advanced DDoS attacks and cyber threats. With dedicated hardware, fully managed services and cloud solutions that protect against attacks, Radware can help ensure service availability. To understand how Radware's attack mitigation solutions can better protect your network contact us today.

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