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US Turning Up the Heat on North Korea's Cyber Threat Operations
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tdsan
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tdsan,
User Rank: Ninja
9/17/2019 | 7:15:41 PM
Re: Utilize the ISP and other vendors to block countries
Well no, not in this case, if we are blocking all traffic (however, hidden or obscure), there will always be a source and destination (we are blocking everything from their country, dns and all). This can be done at the ISP or onsite, 95% of your traffic from the outside world can be blocked. Now if they use a jump host (but the ISP or Akamai would block that as well), we could alleviate this hacking, but it would have to come from a united front (if we are not doing business with them, then why am I allowing them to constantly check my network).

I am not just looking at your site, but layers of protection at the source all the way to the destination. One thing I must say, even when I blocked countries that were considered bad, the hack attempts went down from 2000+ to 5. Not sure about you, but I can deal with that (my UFW/IPTables is blocking all the rest along with SELinux).

T

 
WN2QU
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WN2QU,
User Rank: Apprentice
9/17/2019 | 10:48:06 AM
Re: Utilize the ISP and other vendors to block countries
Not if they are using tools with Obfuscated Server Lists (OSL's) right? 
tdsan
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tdsan,
User Rank: Ninja
9/16/2019 | 8:51:53 PM
Utilize the ISP and other vendors to block countries
Shouldnt' we block country access where this is part of the sanctions imposed on North Korea. By doing so, we remove access to business in the US, this can be done at the ISP. Akamai has the ability to filter traffic at the source and PaloAlto has the ability to block countries (the entire block). With a little programming, MS Windows can do that as well by using PowerShell or NetSH.
Get-NetFirewallRule | 
Where { ($_.DisplayName -like "$RuleName-#*") -And ($_.Description -like "*Do not edit rule by hand*") } |
Remove-NetFirewallRule

# Don't create the firewall rules again if the -DeleteOnly switch was used.
if ($DeleteOnly) { Exit }

$Ranges = Get-Content $File | Where { ($_.Trim().Length -ne 0) -and ($_ -Match '^[0-9a-f]{1,4}[\.\:]') } $RangeCount = $Ranges.Count # Confirm that the InputFile had at least one IP address or IP range to block. if ($RangeCount -eq 0) { "`nThe InputFile contained no IP addresses to block, quitting...`n" Exit } $MaxRangesPerRule = 2000

I know there are ways to address the problem at the source, but it is dependent on the relationships we are trying to maintain.

T

 


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