1 1 00:00:00,240 --> 00:00:02,400 Analyzing network IOCs 2 2 00:00:02,400 --> 00:00:04,500 or indicators of compromise. 3 3 00:00:04,500 --> 00:00:06,840 Now, in this section, we're really going to focus 4 4 00:00:06,840 --> 00:00:08,190 on all of the different ways 5 5 00:00:08,190 --> 00:00:11,220 of identifying bad behavior on a network. 6 6 00:00:11,220 --> 00:00:13,380 Once we find an indicator of compromise, 7 7 00:00:13,380 --> 00:00:15,540 we can then use that to create defenses 8 8 00:00:15,540 --> 00:00:17,550 against these different types of attacks 9 9 00:00:17,550 --> 00:00:20,640 and then we can also use those inside of our threat hunting. 10 10 00:00:20,640 --> 00:00:23,550 Now, there's lots of reasons for using IOCs: 11 11 00:00:23,550 --> 00:00:26,100 we can use it to create defenses or do threat hunting. 12 12 00:00:26,100 --> 00:00:27,660 We can use it for instant response 13 13 00:00:27,660 --> 00:00:30,870 and forensic investigations and lots of other things. 14 14 00:00:30,870 --> 00:00:33,180 Now, while the way we'll use those different IOCs 15 15 00:00:33,180 --> 00:00:34,200 may be very different, 16 16 00:00:34,200 --> 00:00:36,810 the way we learn about these IOCs and gather them 17 17 00:00:36,810 --> 00:00:40,050 and analyze them is going to be very much the same. 18 18 00:00:40,050 --> 00:00:42,480 Now, when we start dealing with network related IOCs, 19 19 00:00:42,480 --> 00:00:44,760 there are lots of different ones out there. 20 20 00:00:44,760 --> 00:00:47,010 For example, what if we start seeing things 21 21 00:00:47,010 --> 00:00:48,840 like port scanning and sweeps? 22 22 00:00:48,840 --> 00:00:50,820 If we see that they may be the indicator 23 23 00:00:50,820 --> 00:00:52,890 that there's an attack coming next. 24 24 00:00:52,890 --> 00:00:55,800 We might identify things like non-standard port usage. 25 25 00:00:55,800 --> 00:00:58,620 For example, maybe I'm seeing SSL being used 26 26 00:00:58,620 --> 00:01:02,040 on some port for web traffic that isn't 443. 27 27 00:01:02,040 --> 00:01:03,780 Well, that would be something that would flag 28 28 00:01:03,780 --> 00:01:05,220 as something I should look for. 29 29 00:01:05,220 --> 00:01:07,080 And if the same attacker uses the same type 30 30 00:01:07,080 --> 00:01:08,610 of ports every single time 31 31 00:01:08,610 --> 00:01:09,990 for the same type of malware, 32 32 00:01:09,990 --> 00:01:13,230 that would be a good indicator or compromise we could use. 33 33 00:01:13,230 --> 00:01:15,690 Maybe we start identifying a covert channel. 34 34 00:01:15,690 --> 00:01:17,190 Like for instance, we start seeing data 35 35 00:01:17,190 --> 00:01:19,170 that's being sent out over a ping packet, 36 36 00:01:19,170 --> 00:01:22,140 because normally, ping packets don't carry data 37 37 00:01:22,140 --> 00:01:23,850 and so that would be something that would be unusual. 38 38 00:01:23,850 --> 00:01:24,960 And if we identify that 39 39 00:01:24,960 --> 00:01:27,270 that might be a sign of a data exfiltration 40 40 00:01:27,270 --> 00:01:30,060 or beaconing or C2 or something like that. 41 41 00:01:30,060 --> 00:01:32,010 Or maybe we start looking around our network 42 42 00:01:32,010 --> 00:01:34,470 and we start seeing devices that we don't recognize. 43 43 00:01:34,470 --> 00:01:36,450 For instance, there's a new wireless access point 44 44 00:01:36,450 --> 00:01:38,100 or a new wireless network out there 45 45 00:01:38,100 --> 00:01:39,720 or there's a new switch. 46 46 00:01:39,720 --> 00:01:41,430 Any of these things could be rogue devices 47 47 00:01:41,430 --> 00:01:42,960 and that could have been something that's an indicator 48 48 00:01:42,960 --> 00:01:44,460 of an insider threat. 49 49 00:01:44,460 --> 00:01:46,890 Now, that insider might have had intention with this 50 50 00:01:46,890 --> 00:01:48,510 or it might have just been something they were doing 51 51 00:01:48,510 --> 00:01:49,620 for convenience. 52 52 00:01:49,620 --> 00:01:51,720 Either way, they're bringing a threat to our network 53 53 00:01:51,720 --> 00:01:53,430 and it's something that we can identify 54 54 00:01:53,430 --> 00:01:55,410 and then relate that back to the intrusion set, 55 55 00:01:55,410 --> 00:01:57,510 in this case, an insider threat. 56 56 00:01:57,510 --> 00:01:59,340 All these things are what we're looking for 57 57 00:01:59,340 --> 00:02:02,550 when we start analyzing networks to identify these IOCs 58 58 00:02:02,550 --> 00:02:04,380 or indicators of compromise. 59 59 00:02:04,380 --> 00:02:06,240 And as we go through the next several lessons 60 60 00:02:06,240 --> 00:02:07,140 in this course, 61 61 00:02:07,140 --> 00:02:09,540 we're going to start talking about individual IOCs 62 62 00:02:09,540 --> 00:02:10,803 and how to identify them.