63 lines
2.0 KiB
Markdown
63 lines
2.0 KiB
Markdown
# Wireshark
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## Information about Pcap Files
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Get information about a given PCAP file in the following way.
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```sh
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capinfos example.pcap
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```
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Show verbose package information and bytes inside the package.
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```sh
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tshark -r example.pcapng -V -x
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```
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Autostop `-a` and ringbuffer `-b` arguments may be set to stop or split files
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at defined duration `duration:10`, sizes `filesize:100`, and count of files
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`files:5`.
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## Extracting USB Keystrokes
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Data between USB devices and the host can be filtered via tshark in order to
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display just the payload, e.g. keystrokes in the following way
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```sh
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tshark -r keystrokes.pcapng -Y "usb.transfer_type==0x01 and frame.len==35 and! (usb.capdata == 00:00:00:00:00:00:00:00)" -T fields -e usbhid.data > output.txt
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```
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A lookup table is needed to [convert the USBHID data to ASCII values](https://gist.github.com/ImAnEnabler/091a9e1ee2d6a0805408e009e2f4a2b5)
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```sh
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python keystrokedecoder.py output.txt
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```
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## Extracting Payload sent in DNS Request
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Search for the DNS requests containing the specific top level domain.
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```sh
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tshark -r capture.pcapng -Y 'dns && ip.dst==167.71.211.113 && (dns contains xyz)' -T fields -e dns.qry.name | awk -F '.' '{print $1}' | uniq > dns.out
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```
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## NTLMv2 hash Reconstruction via SMBv2
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Session setup of SMBv2 leaves enough information to reconstruct the NTLMv2 hash.
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Take a look at the second and third packets of the initialization, namely
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`Session Setup Response, Error: STATUS_MORE_PROCESSING_REQUIRED, NTLMSSP_CHALLENGE`
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and `Session Setup Request, NTLMSSP_AUTH, User: <DOMAIN\USERNAME>`.
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The scheme of an NTLMv2 hash is the following.
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```
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[User name]::[Domain name]:[NTLM Server Challenge]:[NTProofStr]:[Rest of NTLMv2 Response]
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```
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The `NTLM Server Challenge` can be found inside the `Security Blob` of the
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request from the server.
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`User name`, `Domain name` and `NTLMv2 Response` can be found inside the
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`Security Blob` inside the response sent by the client. `NTProofStr` is the
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first part of the `NTLM Response`. Set a `:` between `NTProofStr` and the rest
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of the `NTLMv2 Response`.
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