ctf-forensics

DevOps & Security

CTF 数字取证与信号分析技术。当挑战提供磁盘镜像(.dd/.E01)、内存 dump(.raw/.vmem)、网络抓包(.pcap/.pcapng)、隐写图片/音频、Windows 事件日志(.evtx)时使用。覆盖 Volatility 内存分析、Wireshark 流量还原、binwalk 隐写提取、文件系统恢复等取证全链路

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CTF 数字取证

深入参考

以下参考资料按需加载，根据识别出的具体方向选择对应文件：

磁盘/内存取证（Volatility/VM/VMDK/分区恢复/勒索软件） → references/disk-and-memory.md
磁盘恢复（LUKS/BTRFS/XFS/RAID5/反雕刻） → references/disk-recovery.md
Windows 取证（注册表/SAM/事件日志/WMI/Amcache） → references/windows.md
Linux/应用取证（Docker/Git/浏览器/KeePass） → references/linux-forensics.md
网络取证基础（tcpdump/TLS解密/SMB3/USB音频） → references/network.md
高级网络取证（时序编码/NTLMv2/TCP隐蔽通道/DNS隐写） → references/network-advanced.md
通用隐写术（PDF/SVG/PNG/文件叠加/终端图形） → references/steganography.md
图像隐写术（JPEG DQT/BMP位平面/F5检测/调色板） → references/stego-image.md
高级隐写术（FFT/DTMF/音频/视频帧/JPEG XL） → references/stego-advanced.md
高级隐写术2（视频帧累积/反转音频/多层PNG/EXIF链） → references/stego-advanced-2.md
高级磁盘取证（删除分区恢复/ZFS/LVM Thin/APFS快照） → references/disk-advanced.md
外设捕获分析（USB HID鼠标绘图/键盘捕获解码/蓝牙） → references/peripheral-capture.md
硬件信号（VGA/HDMI/DisplayPort/功率侧信道/键盘声学） → references/signals-and-hardware.md
3D 打印取证（PrusaSlicer/G-code/QOIF） → references/3d-printing.md

分类决策树

拿到取证题？
├─ 文件分析
│  ├─ file/exiftool/binwalk → 识别格式与嵌入文件
│  ├─ 图片 → steghide/zsteg/stegsolve → [references/stego-image.md](references/stego-image.md)
│  ├─ 音频 → 频谱图/DTMF/SSTV → [references/stego-advanced.md](references/stego-advanced.md)
│  └─ PDF → 元数据/隐藏文本/多层 → [references/steganography.md](references/steganography.md)
├─ 磁盘/内存镜像
│  ├─ .dd/.img → mount -o loop,ro → fls/photorec
│  ├─ .ova/.vmdk → tar xf → 7z 提取
│  ├─ 内存 → Volatility3 (pslist/filescan/dumpfiles)
│  └─ RAID/ZFS/BTRFS → [references/disk-recovery.md](references/disk-recovery.md)
├─ 网络流量 (.pcap)
│  ├─ HTTP → tshark --export-objects
│  ├─ TLS → SSLKEYLOGFILE / 弱RSA密钥
│  ├─ SMB → 密钥解密 / NTLMv2 提取
│  └─ DNS → 隐蔽通道 / 尾字节编码
├─ Windows 事件日志 → [references/windows.md](references/windows.md)
├─ 硬件信号 → [references/signals-and-hardware.md](references/signals-and-hardware.md)
└─ 区块链 → mempool.space API / 剥离链追踪

快速启动命令

# 文件分析
file suspicious && exiftool suspicious && binwalk suspicious
strings -n 8 suspicious | grep -iE "flag|ctf"

# 磁盘取证
sudo mount -o loop,ro image.dd /mnt/evidence
fls -r image.dd && photorec image.dd

# 内存取证 (Volatility 3)
vol3 -f memory.dmp windows.pslist
vol3 -f memory.dmp windows.filescan
vol3 -f memory.dmp windows.dumpfiles --physaddr ADDR

# 网络流量
tshark -r capture.pcap -Y "http" --export-objects http,/tmp/out

隐写速查

格式	工具	说明
JPEG	steghide / F5 检测	DQT表/DCT系数比
PNG/BMP	zsteg / stegsolve	位平面/调色板/LSB
音频	multimon-ng / sox	DTMF/频谱/反转
视频	帧累积/逐帧差分	闪烁隐藏QR
PDF	exiftool + binwalk	元数据/注释/EOF后数据

Windows 关键事件 ID

ID	含义
1102	审计日志清除
4720	用户创建
4781	账户重命名
21 (TSLocal)	RDP 登录成功

Windows 事件日志

EVTX 分析关注时间戳（TimeCreated / SystemTime）排序关键事件