2013-12-05_tcpflow-and-BE-update

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We hypothesized that binary network data structures werepresent on non-volatile media.“Binary network data structures” includes:• Network packets• Memory structures associated with network connectionsWe know that binary data are present in RAM.CPUAre they present on storage?Mechanisms:• Swap files• Hibernation files• Binary data structures stored in files.RAMDisk/FlashPC or Phone53
Are low-level binary network data structures persisted tostorage?Approach: use bulk_extractor to find the packets.e.g.:We created scan_net.• Searches for—BPF “pcap” packet headers—IPv4 & IPv6 packets—Ethernet headers—Windows Socket Structuresstruct ip {u_int ip_v:4, /* version */ip_hl:4; /* header length */u_char ip_tos; /* type of service */u_short ip_len; /* total length */u_short ip_id; /* identification */u_short ip_off; /* fragment offset field */u_char ip_ttl; /* time to live */u_char ip_p; /* protocol */u_short ip_sum; /* checksum */struct in_addr ip_src,ip_dst; /* source <strong>and</strong> dest address */}Ran with bulk_extractor• Processed 1817 disk images• Recorded found IP addressesin feature files.R. Beverly, S. Garfinkel, G. Cardwell (NPS) Network Carvinginputscan_netIP addresses54
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TCPBEflowTCP analysis with tcpflow;
Page 3 and 4:
tcpflow is a command-line tool for
Page 6 and 7: tcpflow turns each side of the TCP
Page 14 and 15: tcpflow automatically bins connecti
Page 16 and 17: eport.xml is a DFXML file that reco
Page 18 and 19: tags generated by tcpflow match fiw
Page 20 and 21: Harassment atNITROBAState Universit
Page 22 and 23: To find out what's going on,Nitroba
Page 24 and 25: How to solve this problem:NITROBASt
Page 26 and 27: Slides omitted
Page 28 and 29: tcpflow addresses important “real
Page 30 and 31: 26tcpflow makes transcripts from ea
Page 32 and 33: 28tcpflow makes transcripts with mi
Page 34 and 35: 30tcpflow will detect and split gig
Page 36 and 37: tcpflow 1.4 uses the bulk_extractor
Page 38 and 39: SSL decryption issuesOptions for de
Page 40 and 41: The actual cipher suites used when
Page 42 and 43: 808023One-page visualization of pac
Page 44 and 45: Radiotap information available at T
Page 46 and 47: 802.11 link-layer information avail
Page 48 and 49: plot_wifi_aps.py will transform thi
Page 50 and 51: BEbulk_extractorimprovements
Page 53 and 54: zip.txt — potential zipfile heade
Page 55: Beverly, Robert, Simson Garfinkel a
Page 59 and 60: Hibernation decompression found eve
Page 61 and 62: BE 1.3 put MAC addresses in ether.t
Page 63 and 64: ip_histogram.txt removes random noi
Page 65 and 66: pcap files are a common file format
Page 67 and 68: We find a lot of packets on disks!A
Page 69 and 70: The big picture:using low-probabili
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2013-12-05_tcpflow-and-BE-update

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