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Virtual data rooms and sensitive deals

Acquisition, fundraising, audit: how to spot the fake links, fake transfers and fake contacts that target a data room.

In 30 seconds

Where it happens
In an invitation email, a transfer request or a message from a supposed lawyer or executive, around a deal that is not public.
What the attacker wants
To steal credentials to get into the sharing space, to obtain information or to trigger a transfer.
The reflex
Check every unusual invitation or request through a second channel that you choose yourself, without using the contact details given in the message.
If it's already done
Warn the people in charge of security right away and change the passwords concerned.

What it is

A sensitive deal (an acquisition, a fundraising round, a legal audit) requires sharing confidential documents with people outside the company: a buyer, investors, lawyers, auditors. The documents are often placed in a virtual data room, an online space where each person is invited and where access to each item is set.

The sources cited here do not describe data rooms themselves. They describe the phishing, impersonation and transfer-fraud techniques that target any sharing space. This page draws from them what concerns an employee involved in a confidential deal, without claiming anything about how a particular platform works.

Straight answers

Why does a sensitive deal attract scammers?

Because it brings together people who do not always know each other, urgent messages and money. MITRE describes spearphishing as a manipulation message sent to a specific individual, company or industry1. The attacker can pose as a trusted source1. A deal under way provides a ready-made pretext.

Can an invitation link be fake?

Yes. According to MITRE, the fake site can be a clone of a legitimate login portal, or look like it and carry an address that reuses elements of the real one2. The message is often accompanied by several seemingly urgent follow-ups2. The goal is to collect credentials or other usable information2.

Is a message from a colleague necessarily safe?

No. When an internal account is compromised, the attacker uses it to trap other people in the same organization, often by impersonating an identity3. MITRE also lists internal messaging tools, such as Microsoft Teams, among the channels used3. It notes that this type of attack is hard to prevent with technical controls, since it abuses normal functions3.

Can you be asked for a transfer connected to the deal?

Yes. In CEO fraud or business email compromise, the attacker imitates a trusted entity, then the victim sends money to an account the attacker controls4. MITRE specifies that these incidents can have several victims: the compromised accounts and the one that loses the money4.

1How it works1 min

Social engineering, according to CISA, consists of obtaining information about an organization through human contact. The attacker can present as a new employee, a repairperson or a researcher, and even supply false credentials5. If the attacker does not get enough from one person, they contact another in the same organization and rely on what the first one said to seem credible5.

Applied to a confidential deal, this gives two scenarios. In the first, a fake invitation message leads to an imitated login page. The credentials entered are then used to get into the victim's accounts. In the second, the attacker inserts themselves into the exchanges, takes on the identity of a lawyer or an executive and asks for a document, a piece of information or a payment.

2What you do2 min
  • Check the identity of each new invitee or contact by a means other than the message received. CISA recommends reaching the person another way, for example by calling if you have their number6. It also asks that you not use the contact details on a website linked to the request, and instead use those from earlier exchanges5.
  • Do not click the link in a suspicious message. Cybermalveillance.gouv.fr advises hovering over the link without clicking to see the real address, or using a bookmark you created yourself7. The address shown in the browser must match the expected site exactly, because a single character can change7.
  • Do not share information about the organization, its structure or its networks until you are certain the person is entitled to receive it5.
  • Do not reply to a message asking for sensitive information by email: CISA advises against giving it through that channel and against following the links received5.
  • Turn on multifactor authentication when it exists: it stops a third party from getting into an account with the password alone6.
  • Report unusual requests. CISA states that the report button is usually near the sender's address6.

The sources cited here cover neither watermarking, nor per-folder permissions, nor the access log of a data room: the team that administers the platform is the only one able to answer on these points.

3Pitfalls2 min

Urgency and pressure

CISA lists among the common signs urgent or emotional language that announces serious consequences if there is no immediate reply6. It also cites requests for personal or financial information and incorrect addresses or links6. A signing deadline is not a reason to skip a check.

Messages without mistakes

CISA notes that poor spelling was long a clue, but that some emails now have perfect grammar in the age of artificial intelligence. The other signs must therefore be looked for6.

The almost exact address

Attackers use an address close to that of a known company, changing or omitting a few characters5. A link whose displayed text does not match the destination on hover may be forged5. Shortened addresses hide the real destination5.

The imitated login window

MITRE describes a so-called "browser-in-the-browser" attack: a fake pop-up window with an imitated address bar, which displays a legitimate-looking address and bypasses the usual address check2. MITRE also describes trapped consent: a malicious OAuth 2.0 authorization request which, once accepted, gives an application rights over the account1. A stolen token makes it possible to act on the user's behalf1.

The message to the wrong recipient

The sources cited here do not cover wrong-recipient mistakes, which stem from inattention rather than attack. The reflex of rereading the address before sending does not appear in them; this page therefore sticks to what is sourced: check the identity of those to whom you send material.

4If you have already clicked or replied1 min

CISA asks that any possible disclosure of sensitive information be reported without delay to the competent people in the organization, including network administrators, so that they can watch for abnormal activity5. Revealed passwords must be changed without delay, along with those of other accounts where the same password was used5. Cybermalveillance.gouv.fr adds that evidence should be kept, in particular the phishing message received7.

In the case of a fraudulent debit or payment details that were given out, the same source asks that you contact your bank to block the payment method (stop payment)7. It also mentions filing a complaint7. On the British side, the NCSC explains that it can investigate scam addresses and websites and have them removed, and that reporting a message is free and takes a minute8.

Fact sheet

Identifier
CP-364
Wing
5. Office life and reflexes
Brain skill
Foiling Scams (handle_scams)
Brain reflex
cr-083
Diagram
G5 · Employee Decision Tree
Languages
de, en, fr
Sources
8 sources checked on 3 November 2026
Sources8 sources
  1. MITRE ATT&CK, “Phishing: Spearphishing Link, Sub-technique T1566.002 - Enterprise | MITRE ATT&CK®”. https://attack.mitre.org/techniques/T1566/002/ (accessed 3 November 2026)
  2. MITRE ATT&CK, “Phishing for Information: Spearphishing Link, Sub-technique T1598.003 - Enterprise | MITRE ATT&CK®”. https://attack.mitre.org/techniques/T1598/003/ (accessed 3 November 2026)
  3. MITRE ATT&CK, “Internal Spearphishing, Technique T1534 - Enterprise | MITRE ATT&CK®”. https://attack.mitre.org/techniques/T1534/ (accessed 3 November 2026)
  4. MITRE ATT&CK, “Financial Theft, Technique T1657 - Enterprise | MITRE ATT&CK®”. https://attack.mitre.org/techniques/T1657/ (accessed 3 November 2026)
  5. CISA, “Avoiding Social Engineering and Phishing Attacks | CISA”, 1 February 2021. https://www.cisa.gov/news-events/news/avoiding-social-engineering-and-phishing-attacks (accessed 3 November 2026)
  6. CISA, “Recognize and Report Phishing | CISA”. https://www.cisa.gov/secure-our-world/recognize-and-report-phishing (accessed 3 November 2026)
  7. Cybermalveillance.gouv.fr, “Que faire en cas de phishing ou hameçonnage ? - Assistance aux victimes de cybermalveillance”, 10 January 2020. https://www.cybermalveillance.gouv.fr/tous-nos-contenus/fiches-reflexes/hameconnage-phishing (accessed 3 November 2026)
  8. NCSC (UK), “Phishing scams: how to spot and report them”, 26 November 2021. https://www.ncsc.gov.uk/collection/phishing-scams (accessed 3 November 2026)

Cite this article

Brain, “Virtual data rooms and sensitive deals”, Cyberpedia, 2026. https://startbrain.io/cyberpedia/en/articles/virtual-data-rooms-deal-confidentiality/

BibTeX 
@misc{brain_cp364_en_2026,
  author = {Brain},
  title = {Virtual data rooms and sensitive deals},
  year = {2026},
  howpublished = {Cyberpedia},
  url = {https://startbrain.io/cyberpedia/en/articles/virtual-data-rooms-deal-confidentiality/},
  note = {CC BY 4.0}
}
CC BY 4.0 licence