Re: botnets
By: Nightfox to Lesser Keys on Sat Jan 25 2014 04:27 pm
By "prepaid internet card", I suppose that means the user paid for internet service at a cafe, hotel, etc.? I don't know why that alone would be suspicious to you? I've used internet at hotels & cafes before while traveling and I never had any bad intent. And how do you know he was using a prepaid internet card anyway?
Most hotels give away wifi, I haven't been in one that didn't, and never did I have to buy a internet card. This company is shaddy, like the ones in china that sell prepaid internet cards for chinanet. They use the prepaid card, sign on some were, get on their botnet command center, and start hacking away. I have even watched videos of this being done.
Well for starters, the bots attack in groups, one after the other. I did research on the company, and found out that all the company does is sell phone cards and prepaid internet cards, while the guy was on the server looking at user lists and what not, i seen his bots coming in for attacks. There would be no real way a user list could be gotten unless you sign in, finger and other things are disabled. As he was looking at user lists i seen bots coming in hitting specific accounts, like he was looking at the list. After seeing several ssh attempts and the person sign on several times, without creating a name, i started to watch him with the spy feature of synchronet. He was very interested in the user lists, the server information, synchronet version info, and banned ip black lists..He didn't look at anything on the system but those things. The bots started to come in and attack user accounts on my board while he was online, looking at the user list. It was as if he was using the user list and copy/paste right into his bot scripts and trying to brute force. No other way would someone have gotten the user list unless they sign on and have an account. This person was using the guest account. And no other time of the day did bots from brazil try to hack in unless it was just a strange coincidence. Thing is I personally caught him on the server trying to do things in the past under a masked ip...It's the same guy, I can just tell. After banning the ip he telneted in on as guest, and banning the few ranges he hit me with, he was gone. The botnet attacks only occured while he was online, and looking at the user list and other information. Once he seen me and my brother get on the server, he signed off quick! And then he got the ol' BAN.
What would you think if you had the same exact experience? If you seen a guest sign on with a prepaid phone card, and start looking at user lists, as the user was looking at the user lists, you seen a barrage of bots come to your bbs and try to brute force in. It doesn't take a smart person to realize what's going on. Just a bit of intuition, and that only comes with experience.
It could have been a regular user trying to check things out, but with those actions, and the things that happened while he was on, made the person look real bad. I know how bots attack, the come in groups and leave for a bit and come back. Like you say though it could have been someone just looking at the board, but the situation seemed strange and didn't feel right. You are an experienced computer savy kind of guy, would you have banned the prepaid internet card company and the bots ips, or just the bots?
Take it easy:)
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