Re: Win.Trojan.WannaMine

[Phillip Lee <phillile () sourcefire com>]

Yaser,

Thanks for your submission. We will review the rules and get back to you when they're finished. 

Can you send along the pcaps that you have? 

Regards,
Phil Lee
Cisco Talos

> On Feb 19, 2018, at 1:24 PM, Y M via Snort-sigs <snort-sigs () lists snort org> wrote:
>
> Hi,
>
> Below rules are for detecting WannaMine C&C (excluding lateral movement), and file identity detection for PowerShell 
> scripts. Pcap is available.
>
> alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"MALWARE-CNC Win.Trojan.WannaMine outbound connection 
> attempt"; flow:to_server,established; content:"GET"; content:"/api.php?data="; fast_pattern:only; http_uri; 
> content:!"Connection"; http_header; content:!"Accept"; http_header; content:!"Content"; http_header; 
> content:!"Referer"; http_header; metadata:ruleset community, service http; 
> reference:url,www.microsoft.com/en-us/wdsi/threats/malware-encyclopedia-description?Name=Trojan:PowerShell/WannaMine 
> <http://www.microsoft.com/en-us/wdsi/threats/malware-encyclopedia-description?Name=Trojan:PowerShell/WannaMine>; 
> reference:url,https://otx.alienvault.com/pulse/5a7c5b0a6aefb6060f33f280 
> <https://otx.alienvault.com/pulse/5a7c5b0a6aefb6060f33f280>; classtype:trojan-activity; sid:9000032; rev:1;)
>
> alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"MALWARE-CNC Win.Trojan.WannaMine outbound connection 
> attempt"; flow:to_server,established; content:"GET"; content:"/api.php?data="; fast_pattern:only; http_uri; 
> content:"Connection|3A 20|Keep-Alive|0D 0A|"; http_header; content:!"Accept"; http_header; content:!"Content"; 
> http_header; content:!"Referer"; http_header; metadata:ruleset community, service http; 
> reference:url,www.microsoft.com/en-us/wdsi/threats/malware-encyclopedia-description?Name=Trojan:PowerShell/WannaMine 
> <http://www.microsoft.com/en-us/wdsi/threats/malware-encyclopedia-description?Name=Trojan:PowerShell/WannaMine>; 
> reference:url,https://otx.alienvault.com/pulse/5a7c5b0a6aefb6060f33f280 
> <https://otx.alienvault.com/pulse/5a7c5b0a6aefb6060f33f280>; classtype:trojan-activity; sid:9000033; rev:1;)
>
> alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"FILE-IDENTITY Microsoft PowerShell script file download 
> request"; flow:to_server,established; content:"GET"; http_method; content:".ps1"; fast_pattern:only; http_uri; 
> pcre:"/\x2eps1([\?\x5c\x2f]|$)/smiU"; flowbits:set,file.pwsh; flowbits:noalert; metadata:ruleset community, service 
> http; classtype:misc-activity; sid:9000034; rev:1;)
>
> alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"INDICATOR-COMPROMISE potential character manipulation in 
> PowerShell script"; flow:to_client,established; file_data; content:"-split"; nocase; content:"foreach"; nocase; 
> content:"convert"; nocase; content:"char"; nocase; content:"toint"; nocase; content:"tostring"; nocase; 
> content:"set-item"; nocase; flowbits:isset,file.pwsh; metadata:ruleset community, service http; 
> classtype:misc-activity; sid:9000035; rev:1;)
>
> alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"INDICATOR-COMPROMISE potenital character manipulation in 
> PowerShell script"; flow:to_client,established; file_data; content:"foreach"; nocase; content:"convert"; nocase; 
> content:"char"; nocase; content:"toint"; nocase; content:"tostring"; nocase; content:"set-item"; nocase; 
> flowbits:isset,file.pwsh; metadata:ruleset community, service http; classtype:misc-activity; sid:9000036; rev:1;)
>
> alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"FILE-IDENTIFY Microsoft PowerShell script file attachment 
> detected"; flow:to_server,established; content:".ps1"; fast_pattern:only; content:"Content-Disposition: 
> attachment|3B|"; content:"filename="; nocase; pcre:"/filename=[^\n]*\x2eps1/i"; flowbits:set,file.pwsh; 
> flowbits:noalert; metadata:service smtp; classtype:misc-activity; sid:9000037; rev:1;)
>
> Thanks.
> YM
>
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href=" https://snort.org/downloads/#rule-downloads";>emerging threats</a>!