Cursing in login credentials can help keep the bad guys out, but not when the rest of your security is BS

Welcome back to PWNED, in which offers cautionary tales from folks who’ve left their doors wide open to attackers and lived to tell the tale. This week’s misadventure involves unpatched older machines and a password that was supposed to send a message to crims.

Our story comes courtesy once again of leading red teamer and pen tester Dahvid Schloss of Suzu Labs.

A client asked Schloss to visit a factory and check the servers there for security holes. The company had been hacked six months prior, made some adjustments, and wanted to make sure that they were bulletproof now.

Schloss' mission, which he chose to accept, was to get domain admin rights.

Schloss drove over to the factory where he noticed a number of Windows 7 servers were connected to the CNC milling machines, even though Windows 10 was by then Microsoft's supported desktop OS. This was to be expected, as companies with proprietary software often use legacy OSes for fear of breaking apps.

At first, Schloss had a hard time breaking in because most of the servers were not connected to the domain. So there was no point in his running the EternalBlue zero-day that would have let him in.

“So I've been looking through these and most of them had been disconnected from the domain, so it's the right move,” he said. “Like, yeah, you could run EternalBlue on the network, but you really weren't going to be able to get anywhere with it, cuz you get on the device and what you find: you dump LSASS [the Windows Local Security Authority Subsystem Service], you’re like ‘All right, there’s local admin creds, but the local admin creds on those devices were different from the local admin creds on the majority of workstations.”

Finally, Schloss went onto one of the servers that was connected to milling machines and found that it was connected to the network and on the domain. It was vulnerable to EternalBlue and he went and dumped LSASS and found a pair of creds from WDigest, one of which looked like an admin account.

But Schloss thought that it must not be a legitimate admin account when he read the password : “heyhackergof***yourself,” but written in leet speak [].

The resulting string was a strong password, but Schloss assumed that the admins were playing a game with him and left this credential there for him to find. Schloss assumed it wouldn't work and sat on it for a week.

During a briefing he had with the IT crew, he presented his findings and then asked who set up the admin account with this funny password. 

“You could see everyone kind of looking at the senior manager of IT like ‘that was you, wasn’t it,’” Schloss explained. “He’s kind of got this face. I’m like ‘oh shit, like what?’ Turns out that ‘heyhackergof***yourself’ was the actual password for his admin account."

On Monday, Schloss tried the username and password combo and, lo and behold, it gave him complete control of the entire network. He was then able to get access to other passwords and many of them were also insults directed at potential hackers. 

Schloss understood that the team was still angry about a breach they had suffered six months prior and, should they be breached again, wanted to give the finger to the hacker who did it. Unfortunately, their system was still vulnerable because of the outdated machine that was hooked up to the domain and he was able to gain control.

Indeed, “hackergof***yourself” in leet speak isn’t a terrible password, just an embarrassing one if it's exposed. ®