7MS #474: Password Cracking in the Cloud - Part 3
7 Minute Security30 Juni 2021

7MS #474: Password Cracking in the Cloud - Part 3

Hey friends! Today we're dusting off an old mini-series about password cracking in the cloud (check out part 1 and part 2) and sharing some awesome info on building a monster of a cracking rig in AWS!

One reason we haven't talked about password cracking in the cloud in a while is because back in winter of 2019 I built baby's first password cracking. Unfortunately, this week, Hashy (the name I gave to the rig) is overheating, and GPUs are impossible to find, so what's a pentester to do?

Well, in today's episode I talk about this article from Sevnx which walks you through building a virtual password-cracking beast in the cloud. The article (complemented by a sweet video) will get you running in short order.

WARNING: running this instance is super expensive (the author warns the instance would cost ~$9k/month if you left it run continuously).

The steps are pretty straightforward, but between reboots I found that hashcat acted all wonky. Luckily, the article addresses that with this great tip:

Pro tip: Save the Cuda download somewhere. If you ever turn your cracker off and get errors running hashcat when you turn it back on, re-run the install line. We think AWS sometimes refreshes the drivers or something and hashcat doesn't like it very much.

If you need help installing one of my fave tools, hatecrack check out my password cracking in the cloud gist. Also, our buddy Joe pointed me towards a utility called duplicut to help de-dupe large password-cracking wordlists.

Once the AWS instance is setup, what kind of stats do we get out of this demon? Here's the result of hashcat -b:

Hashmode: 0 - MD5 Speed.#1.........: 55936.1 MH/s (47.79ms) @ Accel:32 Loops:1024 Thr:1024 Vec:8 Speed.#2.........: 55771.4 MH/s (47.94ms) @ Accel:32 Loops:1024 Thr:1024 Vec:8 Speed.#3.........: 55827.0 MH/s (47.88ms) @ Accel:32 Loops:1024 Thr:1024 Vec:8 Speed.#4.........: 55957.7 MH/s (47.78ms) @ Accel:32 Loops:1024 Thr:1024 Vec:8 Speed.#*.........: 223.5 GH/s Hashmode: 100 - SHA1 Speed.#1.........: 17830.1 MH/s (75.08ms) @ Accel:16 Loops:1024 Thr:1024 Vec:1 Speed.#2.........: 17774.0 MH/s (75.21ms) @ Accel:16 Loops:1024 Thr:1024 Vec:1 Speed.#3.........: 17780.9 MH/s (75.26ms) @ Accel:16 Loops:1024 Thr:1024 Vec:1 Speed.#4.........: 17795.6 MH/s (75.22ms) @ Accel:16 Loops:1024 Thr:1024 Vec:1 Speed.#*.........: 71180.6 MH/s Hashmode: 1400 - SHA2-256 Speed.#1.........: 7709.9 MH/s (86.84ms) @ Accel:8 Loops:1024 Thr:1024 Vec:1 Speed.#2.........: 7718.3 MH/s (86.75ms) @ Accel:8 Loops:1024 Thr:1024 Vec:1 Speed.#3.........: 7710.4 MH/s (86.75ms) @ Accel:8 Loops:1024 Thr:1024 Vec:1 Speed.#4.........: 7694.4 MH/s (87.02ms) @ Accel:8 Loops:1024 Thr:1024 Vec:1 Speed.#*.........: 30833.0 MH/s Hashmode: 1700 - SHA2-512 Speed.#1.........: 2399.8 MH/s (69.70ms) @ Accel:8 Loops:256 Thr:1024 Vec:1 Speed.#2.........: 2401.1 MH/s (69.68ms) @ Accel:8 Loops:256 Thr:1024 Vec:1 Speed.#3.........: 2397.3 MH/s (69.78ms) @ Accel:8 Loops:256 Thr:1024 Vec:1 Speed.#4.........: 2400.3 MH/s (69.70ms) @ Accel:8 Loops:256 Thr:1024 Vec:1 Speed.#*.........: 9598.5 MH/s Hashmode: 22000 - WPA-PBKDF2-PMKID+EAPOL (Iterations: 4095) Speed.#1.........: 866.5 kH/s (94.23ms) @ Accel:16 Loops:256 Thr:1024 Vec:1 Speed.#2.........: 866.7 kH/s (94.21ms) @ Accel:16 Loops:256 Thr:1024 Vec:1 Speed.#3.........: 865.6 kH/s (94.30ms) @ Accel:16 Loops:256 Thr:1024 Vec:1 Speed.#4.........: 866.7 kH/s (94.20ms) @ Accel:16 Loops:256 Thr:1024 Vec:1 Speed.#*.........: 3465.5 kH/s Hashmode: 1000 - NTLM Speed.#1.........: 102.2 GH/s (26.05ms) @ Accel:32 Loops:1024 Thr:1024 Vec:8 Speed.#2.........: 102.3 GH/s (26.05ms) @ Accel:32 Loops:1024 Thr:1024 Vec:8 Speed.#3.........: 102.2 GH/s (26.07ms) @ Accel:32 Loops:1024 Thr:1024 Vec:8 Speed.#4.........: 102.3 GH/s (26.04ms) @ Accel:32 Loops:1024 Thr:1024 Vec:8 Speed.#*.........: 409.0 GH/s Hashmode: 3000 - LM Speed.#1.........: 41104.7 MH/s (64.74ms) @ Accel:512 Loops:1024 Thr:64 Vec:1 Speed.#2.........: 40216.5 MH/s (66.11ms) @ Accel:512 Loops:1024 Thr:64 Vec:1 Speed.#3.........: 40507.3 MH/s (65.89ms) @ Accel:512 Loops:1024 Thr:64 Vec:1 Speed.#4.........: 39181.4 MH/s (68.13ms) @ Accel:512 Loops:1024 Thr:64 Vec:1 Speed.#*.........: 161.0 GH/s Hashmode: 5500 - NetNTLMv1 / NetNTLMv1+ESS Speed.#1.........: 55861.0 MH/s (47.87ms) @ Accel:32 Loops:1024 Thr:1024 Vec:2 Speed.#2.........: 55864.3 MH/s (47.87ms) @ Accel:32 Loops:1024 Thr:1024 Vec:2 Speed.#3.........: 55519.4 MH/s (47.98ms) @ Accel:32 Loops:1024 Thr:1024 Vec:2 Speed.#4.........: 55826.6 MH/s (47.89ms) @ Accel:32 Loops:1024 Thr:1024 Vec:2 Speed.#*.........: 223.1 GH/s Hashmode: 5600 - NetNTLMv2 Speed.#1.........: 3968.0 MH/s (84.37ms) @ Accel:4 Loops:1024 Thr:1024 Vec:1 Speed.#2.........: 3968.1 MH/s (84.38ms) @ Accel:4 Loops:1024 Thr:1024 Vec:1 Speed.#3.........: 3965.6 MH/s (84.38ms) @ Accel:4 Loops:1024 Thr:1024 Vec:1 Speed.#4.........: 3967.8 MH/s (84.37ms) @ Accel:4 Loops:1024 Thr:1024 Vec:1 Speed.#*.........: 15869.5 MH/s Hashmode: 1500 - descrypt, DES (Unix), Traditional DES Speed.#1.........: 1752.8 MH/s (95.32ms) @ Accel:32 Loops:1024 Thr:64 Vec:1 Speed.#2.........: 1729.3 MH/s (96.65ms) @ Accel:32 Loops:1024 Thr:64 Vec:1 Speed.#3.........: 1749.5 MH/s (95.53ms) @ Accel:32 Loops:1024 Thr:64 Vec:1 Speed.#4.........: 1740.6 MH/s (96.01ms) @ Accel:32 Loops:1024 Thr:64 Vec:1 Speed.#*.........: 6972.3 MH/s Hashmode: 500 - md5crypt, MD5 (Unix), Cisco-IOS $1$ (MD5) (Iterations: 1000) Speed.#1.........: 24882.8 kH/s (50.59ms) @ Accel:16 Loops:1000 Thr:1024 Vec:1 Speed.#2.........: 24828.0 kH/s (50.60ms) @ Accel:16 Loops:1000 Thr:1024 Vec:1 Speed.#3.........: 24865.7 kH/s (50.60ms) @ Accel:16 Loops:1000 Thr:1024 Vec:1 Speed.#4.........: 24849.6 kH/s (50.59ms) @ Accel:16 Loops:1000 Thr:1024 Vec:1 Speed.#*.........: 99426.0 kH/s Hashmode: 3200 - bcrypt $2*$, Blowfish (Unix) (Iterations: 32) Speed.#1.........: 69071 H/s (54.00ms) @ Accel:4 Loops:16 Thr:24 Vec:1 Speed.#2.........: 68818 H/s (54.25ms) @ Accel:4 Loops:16 Thr:24 Vec:1 Speed.#3.........: 68926 H/s (54.13ms) @ Accel:4 Loops:16 Thr:24 Vec:1 Speed.#4.........: 69013 H/s (54.04ms) @ Accel:4 Loops:16 Thr:24 Vec:1 Speed.#*.........: 275.8 kH/s Hashmode: 1800 - sha512crypt $6$, SHA512 (Unix) (Iterations: 5000) Speed.#1.........: 386.4 kH/s (84.04ms) @ Accel:8 Loops:256 Thr:1024 Vec:1 Speed.#2.........: 377.9 kH/s (85.68ms) @ Accel:8 Loops:256 Thr:1024 Vec:1 Speed.#3.........: 372.3 kH/s (86.76ms) @ Accel:8 Loops:256 Thr:1024 Vec:1 Speed.#4.........: 382.7 kH/s (84.51ms) @ Accel:8 Loops:256 Thr:1024 Vec:1 Speed.#*.........: 1519.3 kH/s Hashmode: 7500 - Kerberos 5, etype 23, AS-REQ Pre-Auth Speed.#1.........: 1177.0 MH/s (71.08ms) @ Accel:256 Loops:128 Thr:32 Vec:1 Speed.#2.........: 1175.4 MH/s (71.17ms) @ Accel:256 Loops:128 Thr:32 Vec:1 Speed.#3.........: 1171.5 MH/s (71.28ms) @ Accel:256 Loops:128 Thr:32 Vec:1 Speed.#4.........: 1177.4 MH/s (71.05ms) @ Accel:256 Loops:128 Thr:32 Vec:1 Speed.#*.........: 4701.3 MH/s Hashmode: 13100 - Kerberos 5, etype 23, TGS-REP Speed.#1.........: 1068.5 MH/s (78.29ms) @ Accel:32 Loops:1024 Thr:32 Vec:1 Speed.#2.........: 1069.4 MH/s (78.25ms) @ Accel:32 Loops:1024 Thr:32 Vec:1 Speed.#3.........: 1068.4 MH/s (78.32ms) @ Accel:32 Loops:1024 Thr:32 Vec:1 Speed.#4.........: 1068.6 MH/s (78.29ms) @ Accel:32 Loops:1024 Thr:32 Vec:1 Speed.#*.........: 4275.0 MH/s Hashmode: 15300 - DPAPI masterkey file v1 (Iterations: 23999) Speed.#1.........: 148.5 kH/s (93.95ms) @ Accel:8 Loops:512 Thr:1024 Vec:1 Speed.#2.........: 148.4 kH/s (93.99ms) @ Accel:8 Loops:512 Thr:1024 Vec:1 Speed.#3.........: 148.5 kH/s (93.96ms) @ Accel:8 Loops:512 Thr:1024 Vec:1 Speed.#4.........: 148.4 kH/s (93.95ms) @ Accel:8 Loops:512 Thr:1024 Vec:1 Speed.#*.........: 593.8 kH/s Hashmode: 15900 - DPAPI masterkey file v2 (Iterations: 12899) Speed.#1.........: 80610 H/s (80.47ms) @ Accel:4 Loops:256 Thr:1024 Vec:1 Speed.#2.........: 80606 H/s (80.47ms) @ Accel:4 Loops:256 Thr:1024 Vec:1 Speed.#3.........: 80596 H/s (80.48ms) @ Accel:4 Loops:256 Thr:1024 Vec:1 Speed.#4.........: 80378 H/s (80.46ms) @ Accel:4 Loops:256 Thr:1024 Vec:1 Speed.#*.........: 322.2 kH/s Hashmode: 7100 - macOS v10.8+ (PBKDF2-SHA512) (Iterations: 1023) Speed.#1.........: 1002.4 kH/s (78.60ms) @ Accel:32 Loops:31 Thr:1024 Vec:1 Speed.#2.........: 1002.4 kH/s (78.60ms) @ Accel:32 Loops:31 Thr:1024 Vec:1 Speed.#3.........: 1002.1 kH/s (78.62ms) @ Accel:32 Loops:31 Thr:1024 Vec:1 Speed.#4.........: 1002.7 kH/s (78.58ms) @ Accel:32 Loops:31 Thr:1024 Vec:1 Speed.#*.........: 4009.6 kH/s Hashmode: 11600 - 7-Zip (Iterations: 16384) Speed.#1.........: 897.6 kH/s (82.05ms) @ Accel:4 Loops:4096 Thr:1024 Vec:1 Speed.#2.........: 896.4 kH/s (82.09ms) @ Accel:4 Loops:4096 Thr:1024 Vec:1 Speed.#3.........: 893.3 kH/s (83.60ms) @ Accel:4 Loops:4096 Thr:1024 Vec:1 Speed.#4.........: 912.4 kH/s (81.95ms) @ Accel:4 Loops:4096 Thr:1024 Vec:1 Speed.#*.........: 3599.7 kH/s Hashmode: 12500 - RAR3-hp (Iterations: 262144) Speed.#1.........: 116.6 kH/s (60.91ms) @ Accel:16 Loops:16384 Thr:128 Vec:1 Speed.#2.........: 111.4 kH/s (63.61ms) @ Accel:16 Loops:16384 Thr:128 Vec:1 Speed.#3.........: 111.6 kH/s (63.63ms) @ Accel:16 Loops:16384 Thr:128 Vec:1 Speed.#4.........: 115.0 kH/s (61.81ms) @ Accel:16 Loops:16384 Thr:128 Vec:1 Speed.#*.........: 454.7 kH/s Hashmode: 13000 - RAR5 (Iterations: 32799) Speed.#1.........: 93248 H/s (54.69ms) @ Accel:16 Loops:128 Thr:1024 Vec:1 Speed.#2.........: 93202 H/s (54.72ms) @ Accel:16 Loops:128 Thr:1024 Vec:1 Speed.#3.........: 93009 H/s (54.70ms) @ Accel:16 Loops:128 Thr:1024 Vec:1 Speed.#4.........: 93241 H/s (54.69ms) @ Accel:16 Loops:128 Thr:1024 Vec:1 Speed.#*.........: 372.7 kH/s Hashmode: 6211 - TrueCrypt RIPEMD160 + XTS 512 bit (Iterations: 1999) Speed.#1.........: 672.2 kH/s (55.34ms) @ Accel:16 Loops:64 Thr:1024 Vec:1 Speed.#2.........: 672.1 kH/s (55.34ms) @ Accel:16 Loops:64 Thr:1024 Vec:1 Speed.#3.........: 671.4 kH/s (55.34ms) @ Accel:16 Loops:64 Thr:1024 Vec:1 Speed.#4.........: 672.2 kH/s (55.34ms) @ Accel:16 Loops:64 Thr:1024 Vec:1 Speed.#*.........: 2687.9 kH/s Hashmode: 13400 - KeePass 1 (AES/Twofish) and KeePass 2 (AES) (Iterations: 24569) Speed.#1.........: 111.2 kH/s (122.52ms) @ Accel:32 Loops:128 Thr:1024 Vec:1 Speed.#2.........: 111.1 kH/s (122.55ms) @ Accel:32 Loops:128 Thr:1024 Vec:1 Speed.#3.........: 111.2 kH/s (122.58ms) @ Accel:32 Loops:128 Thr:1024 Vec:1 Speed.#4.........: 111.2 kH/s (122.52ms) @ Accel:32 Loops:128 Thr:1024 Vec:1 Speed.#*.........: 444.7 kH/s Hashmode: 6800 - LastPass + LastPass sniffed (Iterations: 499) Speed.#1.........: 5944.3 kH/s (35.66ms) @ Accel:8 Loops:249 Thr:1024 Vec:1 Speed.#2.........: 5942.0 kH/s (35.66ms) @ Accel:8 Loops:249 Thr:1024 Vec:1 Speed.#3.........: 5939.0 kH/s (35.67ms) @ Accel:8 Loops:249 Thr:1024 Vec:1 Speed.#4.........: 5943.8 kH/s (35.66ms) @ Accel:8 Loops:249 Thr:1024 Vec:1 Speed.#*.........: 23769.0 kH/s Hashmode: 11300 - Bitcoin/Litecoin wallet.dat (Iterations: 200459) Speed.#1.........: 11370 H/s (73.48ms) @ Accel:2 Loops:1024 Thr:1024 Vec:1 Speed.#2.........: 11355 H/s (73.50ms) @ Accel:2 Loops:1024 Thr:1024 Vec:1 Speed.#3.........: 11369 H/s (73.49ms) @ Accel:2 Loops:1024 Thr:1024 Vec:1 Speed.#4.........: 11370 H/s (73.49ms) @ Accel:2 Loops:1024 Thr:1024 Vec:1 Speed.#*.........: 45464 H/s

For a real world example, I had ~1,500 NTLM hashes to crack that I ran through some of the hatecrack methodology, and here's how the instance performed:

  • 100 LM hashes discovered, all cracked in 7 minutes (heh, 7 minutes :-)
  • Ran hatecrack's quick crackw ith no rules: done in 7 minutes, cracked 108 accounts
  • Quick crack against one rule to rule them all: ran in 25 minutes, got got 271 new passwords
  • Ran extensive hatecrack methodology, it ran for a little over 2 hours and got 88 new passwords.

All said and done, about 1/3 of the passwords cracked in about 3 hours. Not bad!

Don't forget, the second you're done with your cracking efforts, SHUT THE BOX DOWN! Otherwise you're in for a sour surprise come AWS billing day :-(

On a few personal notes:

  • Last Comic Standing was the show I couldn't think of during the episode :-)

  • After a toxic non-toxic foam pit incident a few years ago, my family and I had another injury this weekend with a rented waterslide - the fun ended in a concussion!

Avsnitt(688)

7MS #151: Friday Infosec News and Links Roundup

7MS #151: Friday Infosec News and Links Roundup

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7MS #150: OFF-TOPIC-Bone Tomahawk / Goodnight Mommy / Comedy Loves Misery

7MS #150: OFF-TOPIC-Bone Tomahawk / Goodnight Mommy / Comedy Loves Misery

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7MS #149: Securing Your Life - Part 3

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7MS #148: OFF-TOPIC - Apple Watch Review

7MS #148: OFF-TOPIC - Apple Watch Review

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7MS #147: DIY Hosted Mutillidae

7MS #147: DIY Hosted Mutillidae

In this episode I talk about how to build a cheap hosted Mutillidae server to safely hack away on while keeping other Internet prowlers out. Here are the basic commands to run to lock down the Digital Ocean droplet's iptables firewall: *Flush existing rules* **sudo iptables -F** *Allow all concurrent connections* **sudo iptables -A INPUT -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT** *Allow specific IPs/hosts to access port 80* **sudo iptables -A INPUT -p tcp -s F.Q.D.N --dport 80 -m conntrack --ctstate NEW,ESTABLISHED -j ACCEPT** *Allow specific IPs/hosts to access port 22* **sudo iptables -A INPUT -p tcp -s F.Q.D.N --dport 22 -m conntrack --ctstate NEW,ESTABLISHED -j ACCEPT** *Block all other traffic:* **sudo iptables -P INPUT DROP** *Provide the VPS loopback access:* **sudo iptables -I INPUT 1 -i lo -j ACCEPT** *Install iptables-persistent to ensure rules survive a reboot:* **sudo apt-get install iptables-persistent** *Start iptables-persistent service* **sudo service iptables-persistent start** *If you make iptables changes after this and they don't seem to stick, do this:* **sudo iptables-save > /etc/iptables/rules.v4** See this Digital Ocean article for more information.

26 Jan 20168min

7MS #146: Friday Infosec News and Links Roundup

7MS #146: Friday Infosec News and Links Roundup

Here are some of my favorite stories and links for this week! If you missed last week's BURN IT ALL! Webcast, it's now online as a Youtube video. There is still time to register for the Real World Web Penetration Testing Webinar. It's(Thursday, January 28 @ 1 p.m. CST) and $25 (cheap!) Trustwave is in big trouble after failing to find hackers under their noses. Their noses mustreally hurt because Mandiant was quick to point out the work done by Trustwave was "woefully inadequate." I'm scared of IoT stuff. Why? Oh, I don't know, because what happens when your Nest fails and leaves your buttcheeks freezing cold?!?!? Or what if hackers steal your doorbell, and thus your wifi password and pwn your network? Thankfully, OWASP now now has a top 10 for IoT stuff too. A researcher found some clever ways to abuse Lastpass with an exploit called Lostpass. Lastpassresponded with a security change wherein a Lastpass authentication from a new device requires approval via email. A new Sysinternals tool helps figure out if you have shady, unsigned files in c:\windows\system32. Oh, and for sure upgrade all your iThings ASAP. Apple patched some ugly security holes.

23 Jan 201610min

7MS #145: OFF-TOPIC - Sicario and The Walk

7MS #145: OFF-TOPIC - Sicario and The Walk

In today's off-topic episode I review two movies: Sicario and The Walk.

21 Jan 20167min

7MS #144: Shoulder-Surfing with Seasoned Pentesters

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18 Jan 20167min

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