Earlier this month, the administrator of the cybercrime discussion board Breached acquired a cease-and-desist letter from a cybersecurity agency. The missive alleged that an public sale on the location for information stolen from 10 million prospects of Mexico’s second-largest financial institution was pretend information and harming the financial institution’s fame. The administrator responded to this empty risk by buying the stolen banking information and leaking it on the discussion board for everybody to obtain.
On August 3, 2022, somebody utilizing the alias “Holistic-K1ller” posted on Breached a thread promoting information allegedly stolen from Grupo Financiero Banorte, Mexico’s second-biggest monetary establishment by total loans. Holistic-K1ller mentioned the database included the complete names, addresses, telephone numbers, Mexican tax IDs (RFC), e-mail addresses and balances on greater than 10 million residents.
There was no cause to imagine Holistic-K1ller had fabricated their breach declare. This identification has been extremely energetic on Breached and its predecessor RaidForums for greater than two years, largely promoting databases from hacked Mexican entities. Final month, they offered buyer info on 36 million prospects of the Mexican telephone firm Telcel; in March, they offered 33,000 pictures of Mexican IDs — with the entrance image and a selfie of every citizen. That very same month, additionally they offered information on 1.4 million prospects of Mexican lending platform Yotepresto.
However this historical past was both neglected or ignored by Group-IB, the Singapore-based cybersecurity agency apparently employed by Banorte to assist reply to the information breach.
“The Group-IB crew has found a useful resource containing a fraudulent submit providing to purchase Grupo Financiero Banorte’s leaked databases,” reads a letter the Breach administrator mentioned they acquired from Group-IB. “We ask you to take away this submit containing Banorte information. Thanks in your cooperation and immediate consideration to this pressing matter.”
The administrator of Breached is “Pompompurin,” the identical particular person who alerted this creator in November 2021 to a evident safety gap in a U.S. Justice Division web site that was used to spoof security alerts from the FBI. In a submit to Breached on Aug. 8, Pompompurin mentioned they purchased the Banorte database from Hacker-K1ller’s gross sales thread as a result of Group-IB was sending emails complaining about it.
“In addition they tried to submit DMCA’s towards the web site,” Pompompurin wrote, referring to authorized takedown requests underneath the Digital Millennium Copyright Act. “Be certain that to inform Banorte that now they should fear concerning the information being leaked as a substitute of simply being offered.”
Banorte didn’t reply to requests for remark. Nor did Group-IB. However in a short written assertion picked up on Twitter, Banorte mentioned there was no breach involving their infrastructure, and the information being offered is previous.
“There was no violation of our platforms and technological infrastructure,” Banorte mentioned. “The set of data referred to is inaccurate and outdated, and doesn’t put our customers and prospects in danger.”
That assertion could also be one hundred pc true. Nonetheless, it’s tough to consider a greater instance of how not to do breach response. Banorte shrugging off this incident as a nothingburger is baffling: Whereas it’s virtually actually true that the financial institution steadiness info within the Banorte leak is now outdated, the remainder of the knowledge (tax IDs, telephone numbers, e-mail addresses) is tougher to alter.
“Is there one particular person from our group that suppose sending stop and desist letter to a hackers discussion board operator is a good suggestion?,” asked Ohad Zaidenberg, founding father of CTI League, a volunteer emergency response group that emerged in 2020 to help fight COVID-19 related scams. “Who does it? As an alternative of serving to, they pushed the group from the hill.”
Kurt Seifried, director of IT for the CloudSecurityAlliance, was equally perplexed by the response to the Banorte breach.
“If the information wasn’t actual….did the financial institution suppose a stop and desist would consequence within the itemizing being eliminated?” Seifried wondered on Twitter. “I imply, isn’t promoting breach information a worse crime often than slander or libel? What was their thought course of?”
A extra typical response when a big financial institution suspects a breach is to method the vendor privately by way of an middleman to establish if the knowledge is legitimate and what it may cost to take it off the market. Whereas it could appear odd to count on cybercriminals to make good on their claims to promote stolen information to just one get together, eradicating offered stolen objects from stock is a reasonably fundamental operate of just about all cybercriminal markets at this time (aside from maybe websites that site visitors in stolen identification information).
At a minimal, negotiating or just partaking with a knowledge vendor can purchase the sufferer group further time and clues with which to research the declare and ideally notify affected events of a breach earlier than the stolen information winds up on-line.
It’s true that a lot of hacked databases put up on the market on the cybercrime underground are offered solely after a small subset of in-the-know thieves have harvested all of the low-hanging fruit in the data — e.g., entry to cryptocurrency accounts or person credentials which can be recycled throughout a number of web sites. And it’s actually not unparalleled for cybercriminals to return on their phrase and re-sell or leak info that they’ve offered beforehand.
However corporations within the throes of responding to an information safety incident do themselves and prospects no favors after they underestimate their adversaries, or attempt to intimidate cybercrooks with authorized or different threats. Such responses typically accomplish nothing, besides unnecessarily upping the stakes for everybody concerned whereas displaying a harmful naiveté about how the cybercrime underground works.