Flashback Malware Authors Using Twitter to Talk to Infected Machines

I just upgraded my gfs flashplayer last week ... What are the chances that it's this Trojan ?? How can I check?

Go to your /Users/yourusername/Library/ folder and look to see if you find any of these files:
~/.MacOSX/environment.plist
~/Library/LaunchAgents/com.apple.SystemUI.plist
~/Library/Preferences/perflib
~/Library/Preferences/Preferences.dylib
~/Library/Logs/swlog
If you don't have any of these files, you're not infected.

Your Library folders are hidden by default in Lion. To get to your /Library or /Users/yourusername/Library (also known as the ~/Library) folders in Lion, Launch Finder and click Go > Go to Folder and type: /Library or ~/Library

Here's how to avoid any question:

With my flash player I'm careful. I never click on a pop-up when it tells me it's out of date.

I go to Adobe's site and update there.

This is very important:

To repeat: the vendor has provided no actual evidence that such messages are happening.

In fact, while I may have missed it, I've seen no corroborating evidence supporting the recent reports coming from Intego. I haven't seen any other security firm confirming the presence of these variations, or the variation that supposedly installs itself without user intervention, as they also claim. Until such claims are proven by other companies, I'll continue to find Intego's claims suspicious, at best.

Generally speaking, these reports by security firms are little more than thinly veiled attempts to scare users into buying their security software, which you don't need. However, such reports can be useful reminders for users to continue to practice safe computing.
[LIST=1]
* Make sure your built-in Mac firewall is enabled in System Preferences > Security > Firewall


* Uncheck "Open "safe" files after downloading" in Safari > Preferences > General


* Uncheck "Enable Java" in Safari > Preferences > Security. Leave this unchecked until you visit a trusted site that requires Java, then re-enable only for your visit to that site. (This is not to be confused with JavaScript, which you should leave enabled.)


* Check your DNS settings by reading this (https://guides.macrumors.com/Mac_Virus/Malware_FAQ#Why_am_I_being_redirected_to_other_sites.3F).


* Be careful to only install software from trusted, reputable sites. Never install pirated software. If you're not sure about an app, ask in this forum before installing.


* Never let someone else have physical access to install anything on your Mac.


* Always keep your Mac and application software updated. Use Software Update for your Mac software. For other software, it's safer to get updates from the developer's site or from the menu item "Check for updates", rather than installing from any notification window that pops up while you're surfing the web.

That's all you need to do to keep your Mac completely free of any virus, trojan, spyware, keylogger, or other malware.

You don't need any 3rd party antivirus app to keep your Mac malware-free. Macs are not immune to malware, but no true viruses exist in the wild that can run on Mac OS X, and there never have been any since it was released over 10 years ago. You cannot infect your Mac simply by visiting a website, unzipping a file, opening an email attachment or joining a network. The only malware in the wild that can affect Mac OS X is a handful of trojans, which cannot infect your Mac unless you actively install them, and they can be easily avoided with some basic education, common sense and care in what software you install. Also, Mac OS X Snow Leopard and Lion have anti-malware protection (http://support.apple.com/kb/ht4651) built in, further reducing the need for 3rd party antivirus apps.
Mac Virus/Malware FAQ (https://guides.macrumors.com/Mac_Virus/Malware_FAQ)

The claim is interesting, but a quick search on Twitter doesn't show that #pepbyfadxeoa is actually being used by any program for anything. If the vendor's claim is true, they should be able to tell us a prior hashtag which shows actual nefarious activity.

We are still suffering from Adobe's lax attitudes for security around their products. All of the "Get Flash Player" and "Get Adobe PDF Reader" links that Adobe encouraged in the past have helped foster a lackadaisical attitude towards the clear risk of installing a trojan horse on machines. I will be happy as Flash on the WWW continues to fade into the sunset.

I think this uses twitter even if you don't use it personally, they are just using the open nature of the site as a means to communicate with the malware.

Bingo. If the trojan is actually using twitter as a conduit, it's probably using accounts that were embedded in the trojan. Blocking those would require the blocking of connections to twitter servers with something like Little Snitch (http://www.obdev.at/products/littlesnitch/index.html)
or outbound blocks in your network's firewall.

To repeat: the vendor has provided no actual evidence that such messages are happening. I see no evidence with todays hashtag.

One other note: the Twitter stream is a real cesspool these days. As far as I can tell, Twitter does nothing to automatically remove the 'bot accounts that send out Amazon Associates link-spam. They're also doing nothing to automatically censor accounts that send @mentions that spam the "adult" dating sites. Doesn't Twitter have any friends in the Valley who could help them keep the toxic pollution out of their stream?

Much like life, if you hang around in bars, you can come down with diseases.

So if you don't hang around in bars, you won't catch any diseases???

I'm always suspicious of anti-virus firms who seem to know very specific details of viruses/malware/trojans.

I'm even more suspicious when the claimed evidence doesn't pan out. To alter the slogan from that famous Wendy's commercial (https://www.youtube.com/watch?v=Ug75diEyiA0):

Where's the tweets? :D

I'm always suspicious of anti-virus firms who seem to know very specific details of viruses/malware/trojans.

Word, bro. And what about those pesky "doctors" who seem to know all about illnesses and bacteria and whatnot? Damned scientists!
(Fricking magnets, how do they work?)

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Then you can send a message to the hacker how dumb he was. With the same amount of work he had put into this malware he could have created an app and probably made some money.

You mean he has no bussiness plan for this?

Nasty!!

(I'm breaking my arm patting myself on the back for my non-involement with social media.)

I do feel bad for the majority of the world who does use social media...this is really lousy.

Much crap on social media, but a tremendous amount of good in places where free expression is only possible through Twitter, etc. It's a powerful tool for many in the world, and any sympathy I might have for certain hackers is totally absent in situations like this.

Well, don't over pad yourself. The infection doesn't come from Twitter, but from a fake Adobe Flash Installer. Twitter is only one of the many ways hackers use to communicate with the hacked Macs.