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DIDCTF 应急响应流量日志分析部分

news 2026/5/6 21:00:04

DIDCTF-电子数据取证综合平台

linux-basic-command

网站日志分析
用goaccess工具
assets/DIDCTF 应急响应流量日志分析部分/file-20260505175415310.png

ire7-windows-log

筛选一下就出来了
assets/DIDCTF 应急响应流量日志分析部分/file-20260506204153128.png

wireshark0

telnet流量
assets/DIDCTF 应急响应流量日志分析部分/file-20260506183552210.png

wireshark0.5

http.request.method=="POST"找login位置
assets/DIDCTF 应急响应流量日志分析部分/file-20260506185330908.png

wireshark1

最后一个post流执行了压缩命令，密码是Adm1n!
assets/DIDCTF 应急响应流量日志分析部分/file-20260506192150964.png
另外我们可以分离出下载的压缩包

打开文件就可以获得key

wireshark2

让ai写了个icmp解析器

import tkinter as tk
from tkinter import ttk, filedialog, messagebox
import re
from datetime import datetimetry:from scapy.all import rdpcap, IP, IPv6, ICMP, ICMPv6EchoRequest, ICMPv6EchoReply, Raw
except ImportError:messagebox.showerror("缺少依赖", "请先安装 scapy：pip install scapy")raisedef printable_ascii(data: bytes) -> str:return ''.join(chr(b) if 32 <= b <= 126 else '.' for b in data)def extract_strings(data: bytes, min_len=4):text = printable_ascii(data)return re.findall(r"[ -~]{" + str(min_len) + r",}", text)def hex_dump(data: bytes, width=16):lines = []for i in range(0, len(data), width):chunk = data[i:i + width]hex_part = " ".join(f"{b:02x}" for b in chunk)ascii_part = printable_ascii(chunk)lines.append(f"{i:08x}  {hex_part:<{width * 3}}  {ascii_part}")return "\n".join(lines)class ICMPParserApp:def __init__(self, root):self.root = rootself.root.title("ICMP 流量解析器")self.root.geometry("1200x720")self.packets = []self.icmp_records = []self.build_ui()def build_ui(self):top_frame = ttk.Frame(self.root)top_frame.pack(fill=tk.X, padx=8, pady=6)ttk.Button(top_frame, text="打开 PCAP/PCAPNG", command=self.open_file).pack(side=tk.LEFT, padx=4)ttk.Button(top_frame, text="搜索 key/flag", command=self.search_sensitive).pack(side=tk.LEFT, padx=4)ttk.Button(top_frame, text="提取所有可见字符串", command=self.show_all_strings).pack(side=tk.LEFT, padx=4)ttk.Button(top_frame, text="拼接 Echo Request 首字符", command=self.rebuild_first_chars).pack(side=tk.LEFT, padx=4)ttk.Button(top_frame, text="清空", command=self.clear).pack(side=tk.LEFT, padx=4)self.status_var = tk.StringVar(value="请打开一个流量包")ttk.Label(top_frame, textvariable=self.status_var).pack(side=tk.RIGHT, padx=8)main_pane = ttk.PanedWindow(self.root, orient=tk.VERTICAL)main_pane.pack(fill=tk.BOTH, expand=True, padx=8, pady=6)table_frame = ttk.Frame(main_pane)main_pane.add(table_frame, weight=2)columns = ("no", "time", "src", "dst", "proto", "type", "code", "len", "ascii")self.tree = ttk.Treeview(table_frame, columns=columns, show="headings")headers = {"no": "序号","time": "时间","src": "源地址","dst": "目的地址","proto": "协议","type": "Type","code": "Code","len": "数据长度","ascii": "Data ASCII 预览"}widths = {"no": 60,"time": 160,"src": 150,"dst": 150,"proto": 80,"type": 80,"code": 80,"len": 80,"ascii": 420}for col in columns:self.tree.heading(col, text=headers[col])self.tree.column(col, width=widths[col], anchor=tk.W)self.tree.pack(side=tk.LEFT, fill=tk.BOTH, expand=True)scrollbar = ttk.Scrollbar(table_frame, orient=tk.VERTICAL, command=self.tree.yview)scrollbar.pack(side=tk.RIGHT, fill=tk.Y)self.tree.configure(yscrollcommand=scrollbar.set)self.tree.bind("<<TreeviewSelect>>", self.on_packet_select)detail_frame = ttk.Frame(main_pane)main_pane.add(detail_frame, weight=3)detail_label = ttk.Label(detail_frame, text="数据区详情：Hex + ASCII")detail_label.pack(anchor=tk.W)self.text = tk.Text(detail_frame, wrap=tk.NONE, font=("Consolas", 11))self.text.pack(fill=tk.BOTH, expand=True)x_scroll = ttk.Scrollbar(detail_frame, orient=tk.HORIZONTAL, command=self.text.xview)x_scroll.pack(fill=tk.X)self.text.configure(xscrollcommand=x_scroll.set)def open_file(self):file_path = filedialog.askopenfilename(title="选择流量包",filetypes=[("PCAP files", "*.pcap *.pcapng"),("All files", "*.*")])if not file_path:returntry:self.clear()self.status_var.set("正在解析，请稍等...")self.packets = rdpcap(file_path)self.parse_icmp_packets()self.status_var.set(f"已加载：{file_path}，共发现 {len(self.icmp_records)} 个 ICMP/ICMPv6 包")if not self.icmp_records:messagebox.showinfo("提示", "没有发现 ICMP/ICMPv6 数据包")except Exception as e:messagebox.showerror("解析失败", str(e))self.status_var.set("解析失败")def parse_icmp_packets(self):for index, pkt in enumerate(self.packets, start=1):record = Noneif IP in pkt and ICMP in pkt:ip = pkt[IP]icmp = pkt[ICMP]payload = bytes(icmp.payload)record = {"no": index,"time": self.format_time(float(pkt.time)),"src": ip.src,"dst": ip.dst,"proto": "ICMP","type": int(icmp.type),"code": int(icmp.code),"payload": payload,"summary": pkt.summary()}elif IPv6 in pkt and (ICMPv6EchoRequest in pkt or ICMPv6EchoReply in pkt):ip = pkt[IPv6]if ICMPv6EchoRequest in pkt:icmp6 = pkt[ICMPv6EchoRequest]icmp_type = 128else:icmp6 = pkt[ICMPv6EchoReply]icmp_type = 129payload = bytes(icmp6.payload)record = {"no": index,"time": self.format_time(float(pkt.time)),"src": ip.src,"dst": ip.dst,"proto": "ICMPv6","type": icmp_type,"code": 0,"payload": payload,"summary": pkt.summary()}if record:self.icmp_records.append(record)ascii_preview = printable_ascii(record["payload"])if len(ascii_preview) > 80:ascii_preview = ascii_preview[:80] + "..."self.tree.insert("",tk.END,iid=str(len(self.icmp_records) - 1),values=(record["no"],record["time"],record["src"],record["dst"],record["proto"],record["type"],record["code"],len(record["payload"]),ascii_preview))def on_packet_select(self, event=None):selected = self.tree.selection()if not selected:returnidx = int(selected[0])record = self.icmp_records[idx]payload = record["payload"]self.text.delete("1.0", tk.END)info = []info.append(f"原始包序号：{record['no']}")info.append(f"时间：{record['time']}")info.append(f"源地址：{record['src']}")info.append(f"目的地址：{record['dst']}")info.append(f"协议：{record['proto']}")info.append(f"Type/Code：{record['type']}/{record['code']}")info.append(f"Payload 长度：{len(payload)} 字节")info.append(f"摘要：{record['summary']}")info.append("")info.append("ASCII：")info.append(printable_ascii(payload))info.append("")info.append("Hex Dump：")info.append(hex_dump(payload))self.text.insert(tk.END, "\n".join(info))def search_sensitive(self):if not self.icmp_records:messagebox.showinfo("提示", "请先打开流量包")returnkeywords = ["key", "flag", "password", "pass", "secret", "token"]result = []for record in self.icmp_records:data = printable_ascii(record["payload"])lower_data = data.lower()if any(k in lower_data for k in keywords):result.append(f"[包序号 {record['no']}] {record['src']} -> {record['dst']} "f"Type={record['type']} Code={record['code']}\n{data}\n")self.text.delete("1.0", tk.END)if result:self.text.insert(tk.END, "发现疑似敏感内容：\n\n")self.text.insert(tk.END, "\n".join(result))else:self.text.insert(tk.END, "没有直接发现 key/flag/password/secret/token 等关键字。\n")self.text.insert(tk.END, "可以尝试点击“提取所有可见字符串”继续查看。")def show_all_strings(self):if not self.icmp_records:messagebox.showinfo("提示", "请先打开流量包")returnresult = []for record in self.icmp_records:strings = extract_strings(record["payload"], min_len=4)if strings:result.append(f"[包序号 {record['no']}] {record['src']} -> {record['dst']}")for s in strings:result.append(f"  {s}")result.append("")self.text.delete("1.0", tk.END)if result:self.text.insert(tk.END, "\n".join(result))else:self.text.insert(tk.END, "没有提取到长度 >= 4 的可见字符串。")def rebuild_first_chars(self):if not self.icmp_records:messagebox.showinfo("提示", "请先打开流量包")returnchars_all = []chars_request = []for record in self.icmp_records:payload = record["payload"]if not payload:continuefirst_char = chr(payload[0]) if 32 <= payload[0] <= 126 else "."chars_all.append(first_char)if record["proto"] == "ICMP" and record["type"] == 8:chars_request.append(first_char)if record["proto"] == "ICMPv6" and record["type"] == 128:chars_request.append(first_char)self.text.delete("1.0", tk.END)self.text.insert(tk.END, "所有 ICMP/ICMPv6 Payload 首字符拼接：\n")self.text.insert(tk.END, "".join(chars_all))self.text.insert(tk.END, "\n\nEcho Request Payload 首字符拼接：\n")self.text.insert(tk.END, "".join(chars_request))def clear(self):self.packets = []self.icmp_records = []for item in self.tree.get_children():self.tree.delete(item)self.text.delete("1.0", tk.END)self.status_var.set("已清空")@staticmethoddef format_time(ts):try:return datetime.fromtimestamp(ts).strftime("%Y-%m-%d %H:%M:%S")except Exception:return str(ts)if __name__ == "__main__":root = tk.Tk()app = ICMPParserApp(root)root.mainloop()

assets/DIDCTF 应急响应流量日志分析部分/file-20260506202546489.png
一共执行三次命令，第三次就显示key1了