<< If you can't formulate a realistic threat from this data, how can you possibly re-evalate your security posture in light of it?
You do have a point and it is possible I misunderstood the 'value proposition' from this data set.
From the forum referenced in the article:
"Name / Whatsapp Number - Country Wise "
What I see in that post is name field ( or potentially just a number ) and country field. If I was a person buying it, the main benefit would be "being able to reach a seemingly random ( unless it is separately checked against some other available list/s ) individual in a desired geographic location". As you correctly assessed, by itself it is not a terrible security threat.
<< Can you make a prediction about what bad things will happen to the people whose phone number is in this dump, compared to people whose phone number isn't there?
Yes ( although admittedly, mostly because "bad things" is sufficiently generic to allow for it and I already admitted I think you are right on the security aspect ).
Fraud-wise this is a perfectly sufficient set of information ( current valid numbers likely corresponding with real phone numbers ) as those tend to be number games anyway ( one out of how many answers a spam email type of deal ). In that area, the most common scam lately is grandson scam[1] or romance scam[2]( those having extra benefit of less likely being reported even if others point it out to the victim ). Seniors do seem to use Whatsapp in the old country partially due to price and reliability ( dunno how common it is in US though ) so they fit that target demographic, but that assumes fraudster can reliably identify a victim set of seniors ( or burn existing set with a more generic pitch ). For non-seniors, crypto scams seemed very common lately ( and how many people just click yes, when an invitation pops up ) although recent crash likely made it less desirable.
In other words, I think you are right about not doing anything specific security-wise, but it may be worthwhile talking with your social circle if they use Whatsapp since they may now see an increase in unsolicited calls/messages/invites and benefit from a conversation about about safety online in general.
You do have a point and it is possible I misunderstood the 'value proposition' from this data set.
From the forum referenced in the article:
"Name / Whatsapp Number - Country Wise "
What I see in that post is name field ( or potentially just a number ) and country field. If I was a person buying it, the main benefit would be "being able to reach a seemingly random ( unless it is separately checked against some other available list/s ) individual in a desired geographic location". As you correctly assessed, by itself it is not a terrible security threat.
<< Can you make a prediction about what bad things will happen to the people whose phone number is in this dump, compared to people whose phone number isn't there?
Yes ( although admittedly, mostly because "bad things" is sufficiently generic to allow for it and I already admitted I think you are right on the security aspect ).
Fraud-wise this is a perfectly sufficient set of information ( current valid numbers likely corresponding with real phone numbers ) as those tend to be number games anyway ( one out of how many answers a spam email type of deal ). In that area, the most common scam lately is grandson scam[1] or romance scam[2]( those having extra benefit of less likely being reported even if others point it out to the victim ). Seniors do seem to use Whatsapp in the old country partially due to price and reliability ( dunno how common it is in US though ) so they fit that target demographic, but that assumes fraudster can reliably identify a victim set of seniors ( or burn existing set with a more generic pitch ). For non-seniors, crypto scams seemed very common lately ( and how many people just click yes, when an invitation pops up ) although recent crash likely made it less desirable.
In other words, I think you are right about not doing anything specific security-wise, but it may be worthwhile talking with your social circle if they use Whatsapp since they may now see an increase in unsolicited calls/messages/invites and benefit from a conversation about about safety online in general.
[1]https://www.aarp.org/money/scams-fraud/info-2019/grandparent... [2]https://www.fbi.gov/how-we-can-help-you/safety-resources/sca...