etresoft wrote:
iCloud data also lives on your machine or device. If you have sneaky apps or malicious software, your contacts could be harvested locally. There is no proof that Apple's iCloud servers were hacks. There is proof that both sneaky apps and malicious software exist.
Yes, it is very true that sneaky apps and malicious software do exist, and that was the first thing I considered when I learned that my account had been used to send spam, as it did not seem likely that someone had gained access to my account through guessing or brute force. So, I thought "uh oh, I picked up a keylogging piece of malware." However, this seems highly unlikely to be the case for several reasons.
1) In addition to using a firewall and being extremly careful with how I use my technology (I worked in IT providing, among other things, network security consulting for a number of years, so I learned a few things about staying safe online), I run security software on my computer. It is always running in the background, and I have it scheduled to also do an entire system scan once a week. I do also regularly check what processes are running, and everything is as it should be. Although malware does exist that can escape the notice of even the best security software, I feel confident that my computer is not compromised.
2) I never use icloud.com, have never used my @me email address on any device, and do not allow my web browser to retain log-in data for any website. Thus, even if I did have a keylogging piece of malware on my computer, it would not have had the opportunity to grab my iCloud password. Furthermore, I used a unique password for my iCloud account, so a malicious program could not have harvested a password for a seperate account that I use more often and applied it to iCloud.
3) There are a small group of users who report identical behavior in this thread, however I doubt that this represents everyone who has been compromised. Indeed, when I worked in IT, had we seen a pattern of even this size emerge in terms of nefarious network behavior, we wouldn't have paniced or assumed that we had been compromised, but we would have flagged the issue for further review, which is what I would like Apple to do, just to be safe.
This is why I want people with this issue to call Apple and let them know if their account has been hijacked. Yes, there are many possible explanations for what has happened, and iCloud servers being compromised is only one possible scenario. As users, we are not able to determine for sure what has happened, but letting Apple know about the problem at least ensures that if a pattern does emerge suggestive of nefarious activity, they can detect and counter it.