文章作者：skyXnet
信息来源：看雪论坛
% 超强灰鸽子vip2005检测器 % 检测原理简单分析
http://skyxnet.blogdriver.com/skyxnet/1013647.html
前言，新款的灰鸽子总给人无处不在的感觉, 自己就曾在朋友主机中碰到多次,每次只能手工判断并清除.在看到此款检测器时，作了少许测试。效果很不错， 就产生了想了解她是如何工作的！^_^
先来看看系统未感染 灰鸽子 时的执行情况=>>>
00459E2B 68 10A24500 push 超强灰鸽.0045A210
; ASCII "GPigeon5_Shared"
00459E30 6A 00 push 0
00459E32 6A 04 push 4
00459E34 E8 E3C3FAFF call <jmp.&kernel32.OpenFileMappingA>
00459E39 A3 ACDC4500 mov dword ptr ds:[45DCAC],eax
; Eax=0 表示无可操作句柄
00459E3E 833D ACDC4500 0>cmp dword ptr ds:[45DCAC],0
00459E45 0F84 70030000 je 超强灰鸽.0045A1BB ; jump
OpenFileMappingA()函数执行后的堆栈情况：
0012F5E4 00000004 |Access = FILE_MAP_READ
0012F5E8 00000000 |InheritHandle = FALSE
0012F5EC 0045A210 \MappingName = "GPigeon5_Shared"
0045A1BB 8B83 FC020000 mov eax,dword ptr ds:[ebx+2FC] ;跳到此处
0045A1C1 8B80 20020000 mov eax,dword ptr ds:[eax+220]
0045A1C7 BA C8A34500 mov edx,超强灰鸽.0045A3C8
; 没有检测到 灰鸽子 Vip 2005 服务端
0045A1CC 8B08 mov ecx,dword ptr ds:[eax]
; ecx=0x427c4c ASCII "4AA"
0045A1CE FF51 38 call dword ptr ds:[ecx+38] ; Retn eax=0
0045A1D1 833D ACDC4500 0>cmp dword ptr ds:[45DCAC],0
0045A1D8 74 0B je short 超强灰鸽.0045A1E5 ; Jump
0045A1DA A1 ACDC4500 mov eax,dword ptr ds:[45DCAC]
0045A1DF 50 push eax
0045A1E0 E8 F7BDFAFF call <jmp.&kernel32.CloseHandle>
0045A1E5 33C0 xor eax,eax
0045A1E7 5A pop edx
0045A1E8 59 pop ecx
0045A1E9 59 pop ecx
0045A1EA 64:8910 mov dword ptr fs:[eax],edx
0045A1ED 68 07A24500 push 超强灰鸽.0045A207
0045A1F2 8D45 B8 lea eax,dword ptr ss:[ebp-48]
0045A1F5 BA 12000000 mov edx,12
0045A1FA E8 F99CFAFF call 超强灰鸽.00403EF8
0045A1FF C3 retn ;retn to 0x45a207
剩下的是一些返回后的处理...
这里可以看到,检测系统是否存在 "灰鸽子 Vip 2005 服务端" 是通过 OpenFileMappingA()打开一个现成的文件映射对象,如存在则返回成功打开的句柄,否则退出往下的检测清除程序段,用C简单可描述成：
hMap = OpenFileMapping(FILE_MAP_READ,FALSE,"GPigeon5_Shared");
if (hMap == NULL)
{
"没有检测到 灰鸽子 Vip 2005 服务端!"
}
此时, 程序编辑中出来提示信息:"没有检测到 灰鸽子 Vip 2005 服务端!"
接着进入 灰鸽子 感染系统后 的检测及清除代码的分析...
同样地, 程序照常中断在此处=>>
00459E2B 68 10A24500 push 超强灰鸽.0045A210
; ASCII "GPigeon5_Shared"
00459E30 6A 00 push 0
00459E32 6A 04 push 4
00459E34 E8 E3C3FAFF call <jmp.&kernel32.OpenFileMappingA>
00459E39 A3 ACDC4500 mov dword ptr ds:[45DCAC],eax
; 如果检测到：eax=0xcc 0xb4 0xd8 句柄值，如无：eax=0
00459E3E 833D ACDC4500 00 cmp dword ptr ds:[45DCAC],0
00459E45 0F84 70030000 je 超强灰鸽.0045A1BB ; not jump
00459E4B 8B83 FC020000 mov eax,dword ptr ds:[ebx+2FC] ; eax=01023f24
00459E51 8B80 20020000 mov eax,dword ptr ds:[eax+220] ; eax=01024208
00459E57 BA 28A24500 mov edx,超强灰鸽.0045A228
; edx=0x45a228 => 检测到 灰鸽子 Vip 2005 0105 服务端存在
00459E5C 8B08 mov ecx,dword ptr ds:[eax]
; ecx=0x427c4c ; ASCII "4AA"
00459E5E FF51 38 call dword ptr ds:[ecx+38]
; 编辑框中显示检测到的字符
00459E61 6A 00 push 0
00459E63 6A 00 push 0
00459E65 6A 00 push 0
00459E67 6A 04 push 4
00459E69 A1 ACDC4500 mov eax,dword ptr ds:[45DCAC]
; eax=0xcc \\0xb4 \\0xd8,句柄值
00459E6E 50 push eax
; 将此句柄值压入堆栈,供下一函数用
00459E6F E8 98C3FAFF call <jmp.&kernel32.MapViewOfFile> ;映射文件名
; Retn EAX=01330000=》ASCII "一大串数字"
00459E74 8BF0 mov esi,eax
堆栈值：
eax=01310000, (ASCII "5F7E8111692AAA7694C721CB5300D7072A14D8CE7138EA0903AEAA23D8907C6072109D983725466507924E2237B9AF5BFBA7FC98060E8E620FE692E8DA4EE8D963D6241181D3988E9A13550DC7AF1E816F8FB154967BA939DDF9F6AC6F9B225CBDBDADFF3410875CA95DC8BA5C46BBC9A79DDA0F)
esi=00429028 (超强灰鸽.00429028)
??? 不知道是什么数据来的 ??? 检验码？
00459E76 85F6 test esi,esi
00459E78 74 62 je short 超强灰鸽.00459EDC ; NoT jUMP
00459E7A 8D45 F4 lea eax,dword ptr ss:[ebp-C]
; EAX=0X12F640
00459E7D 8BD6 mov edx,esi
; 将那串字符串传入EDX中
00459E7F E8 48A2FAFF call 超强灰鸽.004040CC ; ECX=00,EDX=00
00459E84 B2 01 mov dl,1 ; edx=0x1
00459E86 A1 70954500 mov eax,dword ptr ds:[459570]
00459E8B E8 48F7FFFF call 超强灰鸽.004595D8
00459E90 8BF0 mov esi,eax
00459E92 8B45 F4 mov eax,dword ptr ss:[ebp-C] ;
将那串字符串再入传入
00459E95 E8 FAA4FAFF call 超强灰鸽.00404394
00459E9A 8BD0 mov edx,eax
00459E9C 8D45 EC lea eax,dword ptr ss:[ebp-14]
00459E9F E8 28A2FAFF call 超强灰鸽.004040CC
00459EA4 8B45 EC mov eax,dword ptr ss:[ebp-14]
; EAX=01024398,ASCII"特征串"
00459EA7 8D4D F0 lea ecx,dword ptr ss:[ebp-10]
00459EAA BA 5CA24500 mov edx,超强灰鸽.0045A25C
; edx=0x45a25c ASCII "20050101"
00459EAF E8 A0F5FFFF call 超强灰鸽.00459454
00459EB4 8B55 F0 mov edx,dword ptr ss:[ebp-10]
00459EB7 8BC6 mov eax,esi
00459EB9 E8 FEF7FFFF call 超强灰鸽.004596BC
00459EBE 8D4D F8 lea ecx,dword ptr ss:[ebp-8]
00459EC1 33D2 xor edx,edx
00459EC3 8BC6 mov eax,esi
00459EC5 E8 9AF8FFFF call 超强灰鸽.00459764
00459ECA 8BC6 mov eax,esi
00459ECC E8 0792FAFF call 超强灰鸽.004030D8
00459ED1 A1 ACDC4500 mov eax,dword ptr ds:[45DCAC]
00459ED6 50 push eax
; EAX=0XCC,句柄
00459ED7 E8 00C1FAFF call <jmp.&kernel32.CloseHandle>
; 关闭操作的句柄
00459EDC 8D45 E8 lea eax,dword ptr ss:[ebp-18]
00459EDF 8B4D F8 mov ecx,dword ptr ss:[ebp-8]
; ECX=010252F0=ASCII "83034" ,VIP 用户名
00459EE2 BA 70A24500 mov edx,超强灰鸽.0045A270
00459EE7 E8 F4A2FAFF call 超强灰鸽.004041E0
00459EEC 8B55 E8 mov edx,dword ptr ss:[ebp-18]
; 传入编辑框中=》Vip用户名：83034
00459EEF 8B83 FC020000 mov eax,dword ptr ds:[ebx+2FC]
00459EF5 8B80 20020000 mov eax,dword ptr ds:[eax+220]
00459EFB 8B08 mov ecx,dword ptr ds:[eax]
00459EFD FF51 38 call dword ptr ds:[ecx+38]
00459F00 E8 37FCFFFF call 超强灰鸽.00459B3C
; 该函数检测是否存在隐藏模块,返回eax=0x1 表示检测到隐藏模块
00459F05 84C0 test al,al
00459F07 0F84 96020000 je 超强灰鸽.0045A1A3 ; not jump
00459F0D E8 E6FAFFFF call 超强灰鸽.004599F8
; 打开令牌环，设置系统调试权限
00459F12 E8 61FCFFFF call 超强灰鸽.00459B78
; 检测隐藏模块,映射出具体的文件名
00459F17 8B83 FC020000 mov eax,dword ptr ds:[ebx+2FC]
00459F1D 8B80 20020000 mov eax,dword ptr ds:[eax+220]
00459F23 BA 84A24500 mov edx,超强灰鸽.0045A284
00459F28 8B08 mov ecx,dword ptr ds:[eax]
00459F2A FF51 38 call dword ptr ds:[ecx+38]
; 该函数处理一些消息
00459F2D A1 C8DC4500 mov eax,dword ptr ds:[45DCC8]
00459F32 33D2 xor edx,edx
00459F34 52 push edx
00459F35 50 push eax
00459F36 8D45 E0 lea eax,dword ptr ss:[ebp-20]
00459F39 E8 EAE1FAFF call 超强灰鸽.00408128
; 获取隐藏进程ID ?
00459F3E 8B4D E0 mov ecx,dword ptr ss:[ebp-20]
; ecx=00ee546c ascii "916"\\1804
00459F41 8D45 E4 lea eax,dword ptr ss:[ebp-1C]
00459F44 BA B4A24500 mov edx,超强灰鸽.0045A2B4
00459F49 E8 92A2FAFF call 超强灰鸽.004041E0
00459F4E 8B55 E4 mov edx,dword ptr ss:[ebp-1C]
00459F51 8B83 FC020000 mov eax,dword ptr ds:[ebx+2FC]
00459F57 8B80 20020000 mov eax,dword ptr ds:[eax+220]
00459F5D 8B08 mov ecx,dword ptr ds:[eax]
00459F5F FF51 38 call dword ptr ds:[ecx+38]
; 隐藏的进程ID：1804
00459F62 8D45 DC lea eax,dword ptr ss:[ebp-24]
00459F65 8B0D B8DC4500 mov ecx,dword ptr ds:[45DCB8]
00459F6B BA CCA24500 mov edx,超强灰鸽.0045A2CC
00459F70 E8 6BA2FAFF call 超强灰鸽.004041E0
00459F75 8B55 DC mov edx,dword ptr ss:[ebp-24]
00459F78 8B83 FC020000 mov eax,dword ptr ds:[ebx+2FC]
00459F7E 8B80 20020000 mov eax,dword ptr ds:[eax+220]
00459F84 8B08 mov ecx,dword ptr ds:[eax]
00459F86 FF51 38 call dword ptr ds:[ecx+38]
; 安装文件名： LWVVKL_
00459F89 8D45 D8 lea eax,dword ptr ss:[ebp-28]
00459F8C 8B0D BCDC4500 mov ecx,dword ptr ds:[45DCBC]
00459F92 BA E4A24500 mov edx,超强灰鸽.0045A2E4
00459F97 E8 44A2FAFF call 超强灰鸽.004041E0
00459F9C 8B55 D8 mov edx,dword ptr ss:[ebp-28]
00459F9F 8B83 FC020000 mov eax,dword ptr ds:[ebx+2FC]
00459FA5 8B80 20020000 mov eax,dword ptr ds:[eax+220]
00459FAB 8B08 mov ecx,dword ptr ds:[eax]
00459FAD FF51 38 call dword ptr ds:[ecx+38]
; 主DLL文件名： 3WVVK+3
00459FB0 8D45 D4 lea eax,dword ptr ss:[ebp-2C]
00459FB3 E8 94FDFFFF call 超强灰鸽.00459D4C
; GetWindowsDirectoryA()
00459FB8 FF75 D4 push dword ptr ss:[ebp-2C]
; SS:[0012F620]=00EE54E4 ASCII "D:\WINDOWS\"
00459FBB 8D45 D0 lea eax,dword ptr ss:[ebp-30]
00459FBE 50 push eax
00459FBF A1 B8DC4500 mov eax,dword ptr ds:[45DCB8]
00459FC4 E8 CBA1FAFF call 超强灰鸽.00404194
00459FC9 8BC8 mov ecx,eax
00459FCB 83E9 04 sub ecx,4
00459FCE BA 01000000 mov edx,1
00459FD3 A1 B8DC4500 mov eax,dword ptr ds:[45DCB8]
; LWVVKL_
00459FD8 E8 17A4FAFF call 超强灰鸽.004043F4
00459FDD FF75 D0 push dword ptr ss:[ebp-30]
; ASCII "LWVV"
00459FE0 68 FCA24500 push 超强灰鸽.0045A2FC
; ASCII "_Hook.DLL"
00459FE5 8D45 FC lea eax,dword ptr ss:[ebp-4]
00459FE8 BA 03000000 mov edx,3
; 3个字符串连接数
00459FED E8 62A2FAFF call 超强灰鸽.00404254
; 将三个字符串连接起来ASCII "D:\WINDOWS\LWVV_Hook.DLL"
00459FF2 8B45 FC mov eax,dword ptr ss:[ebp-4]
; EAX=00459FF2 SS:[0012F648]=00EE5510,ASCII "D:\WINDOWS\LWVV_Hook.DLL"
00459FF5 E8 9AA1FAFF call 超强灰鸽.00404194
; EAX=0X18=24 => ASCII "D:\WINDOWS\LWVV_Hook.DLL" 字符长度数
00459FFA 8BD0 mov edx,eax
00459FFC 85D2 test edx,edx
00459FFE 7E 18 jle short 超强灰鸽.0045A018
0045A000 BE 01000000 mov esi,1
0045A005 B8 CCDC4500 mov eax,超强灰鸽.0045DCCC
; ASCII "D:\WINDOWS\LWVV_Hook.DLL"
0045A00A 8B4D FC mov ecx,dword ptr ss:[ebp-4]
0045A00D 8A4C31 FF mov cl,byte ptr ds:[ecx+esi-1]
0045A011 8808 mov byte ptr ds:[eax],cl
0045A013 46 inc esi
0045A014 40 inc eax
0045A015 4A dec edx
0045A016 ^ 75 F2 jnz short 超强灰鸽.0045A00A
0045A018 E8 47C1FAFF call <jmp.&kernel32.GetVersion>
0045A01D A9 00000080 test eax,80000000
0045A022 74 13 je short 超强灰鸽.0045A037 ; JUMP
0045A024 68 581B0000 push 1B58
0045A029 68 CCDC4500 push 超强灰鸽.0045DCCC
; ASCII "D:\WINDOWS\LWVV_Hook.DLL"
0045A02E 6A FD push -3
0045A030 E8 97E6FFFF call 超强灰鸽.004586CC
0045A035 EB 2B jmp short 超强灰鸽.0045A062
0045A037 8B45 FC mov eax,dword ptr ss:[ebp-4]
0045A03A E8 55A1FAFF call 超强灰鸽.00404194
0045A03F 8BC8 mov ecx,eax
0045A041 03C9 add ecx,ecx
0045A043 41 inc ecx
0045A044 BA D4DD4500 mov edx,超强灰鸽.0045DDD4
; UNICODE "D:\WINDOWS\LWVV_Hook.DLL"
0045A049 8B45 FC mov eax,dword ptr ss:[ebp-4]
0045A04C E8 1FACFAFF call 超强灰鸽.00404C70
; MultiByteToWideChar()
0045A051 68 581B0000 push 1B58
0045A056 68 D4DD4500 push 超强灰鸽.0045DDD4
; UNICODE "D:\WINDOWS\LWVV_Hook.DLL"
0045A05B 6A FD push -3
0045A05D E8 96E6FFFF call 超强灰鸽.004586F8
0045A062 8B83 FC020000 mov eax,dword ptr ds:[ebx+2FC]
0045A068 8B80 20020000 mov eax,dword ptr ds:[eax+220]
0045A06E BA 10A34500 mov edx,超强灰鸽.0045A310
0045A073 8B08 mov ecx,dword ptr ds:[eax]
0045A075 FF51 38 call dword ptr ds:[ecx+38]
0045A078 6A 00 push 0
0045A07A 68 30A34500 push 超强灰鸽.0045A330
; ASCII "TGVIP_MainForm"
0045A07F E8 78C5FAFF call <jmp.&user32.FindWindowA>
;查找隐藏进程窗口
0045A084 8BF0 mov esi,eax
0045A086 85F6 test esi,esi
0045A088 74 61 je short 超强灰鸽.0045A0EB
0045A08A 8B83 FC020000 mov eax,dword ptr ds:[ebx+2FC]
0045A090 8B80 20020000 mov eax,dword ptr ds:[eax+220]
0045A096 BA 48A34500 mov edx,超强灰鸽.0045A348
0045A09B 8B08 mov ecx,dword ptr ds:[eax]
0045A09D FF51 38 call dword ptr ds:[ecx+38]
0045A0A0 6A 64 push 64
0045A0A2 E8 8128FBFF call <jmp.&kernel32.Sleep>
0045A0A7 6A 00 push 0
0045A0A9 6A 00 push 0
0045A0AB 68 00340000 push 3400
0045A0B0 56 push esi
0045A0B1 E8 86C7FAFF call <jmp.&user32.PostMessageA>
0045A0B6 6A 64 push 64
0045A0B8 E8 6B28FBFF call <jmp.&kernel32.Sleep>
0045A0BD 6A 00 push 0
0045A0BF 6A 00 push 0
0045A0C1 68 00340000 push 3400
0045A0C6 56 push esi
0045A0C7 E8 70C7FAFF call <jmp.&user32.PostMessageA>
0045A0CC 6A 64 push 64
0045A0CE E8 5528FBFF call <jmp.&kernel32.Sleep>
0045A0D3 6A 00 push 0
0045A0D5 6A 00 push 0
0045A0D7 68 00340000 push 3400
0045A0DC 56 push esi
0045A0DD E8 5AC7FAFF call <jmp.&user32.PostMessageA>
0045A0E2 6A 64 push 64
0045A0E4 E8 3F28FBFF call <jmp.&kernel32.Sleep>
0045A0E9 EB 16 jmp short 超强灰鸽.0045A101
0045A0EB 8B83 FC020000 mov eax,dword ptr ds:[ebx+2FC]
0045A0F1 8B80 20020000 mov eax,dword ptr ds:[eax+220]
0045A0F7 BA 7CA34500 mov edx,超强灰鸽.0045A37C
0045A0FC 8B08 mov ecx,dword ptr ds:[eax]
0045A0FE FF51 38 call dword ptr ds:[ecx+38]
0045A101 8D45 CC lea eax,dword ptr ss:[ebp-34]
0045A104 E8 43FCFFFF call 超强灰鸽.00459D4C
0045A109 8D45 CC lea eax,dword ptr ss:[ebp-34]
0045A10C 8B15 B8DC4500 mov edx,dword ptr ds:[45DCB8]
0045A112 E8 85A0FAFF call 超强灰鸽.0040419C
0045A117 8B45 CC mov eax,dword ptr ss:[ebp-34]
0045A11A 33D2 xor edx,edx
0045A11C E8 9BE3FAFF call 超强灰鸽.004084BC
0045A121 8D45 C4 lea eax,dword ptr ss:[ebp-3C]
0045A124 E8 23FCFFFF call 超强灰鸽.00459D4C
; 取消所要处理文件的属性
0045A129 8D45 C4 lea eax,dword ptr ss:[ebp-3C]
0045A12C 8B15 B8DC4500 mov edx,dword ptr ds:[45DCB8]
0045A132 E8 65A0FAFF call 超强灰鸽.0040419C
0045A137 8B45 C4 mov eax,dword ptr ss:[ebp-3C]
0045A13A E8 55A2FAFF call 超强灰鸽.00404394
0045A13F 8BD0 mov edx,eax
0045A141 8D45 C8 lea eax,dword ptr ss:[ebp-38]
0045A144 E8 839FFAFF call 超强灰鸽.004040CC
0045A149 8B45 C8 mov eax,dword ptr ss:[ebp-38]
0045A14C E8 93E3FAFF call 超强灰鸽.004084E4
; 删除病毒文件
0045A151 8D45 C0 lea eax,dword ptr ss:[ebp-40]
0045A154 E8 F3FBFFFF call 超强灰鸽.00459D4C
; 获取WINDOWS目录
0045A159 8D45 C0 lea eax,dword ptr ss:[ebp-40]
0045A15C 8B15 BCDC4500 mov edx,dword ptr ds:[45DCBC]
0045A162 E8 35A0FAFF call 超强灰鸽.0040419C
0045A167 8B45 C0 mov eax,dword ptr ss:[ebp-40]
0045A16A 33D2 xor edx,edx
0045A16C E8 4BE3FAFF call 超强灰鸽.004084BC
; 取消文件的属性
0045A171 8D45 B8 lea eax,dword ptr ss:[ebp-48]
0045A174 E8 D3FBFFFF call 超强灰鸽.00459D4C
0045A179 8D45 B8 lea eax,dword ptr ss:[ebp-48]
0045A17C 8B15 BCDC4500 mov edx,dword ptr ds:[45DCBC]
0045A182 E8 15A0FAFF call 超强灰鸽.0040419C
0045A187 8B45 B8 mov eax,dword ptr ss:[ebp-48]
0045A18A E8 05A2FAFF call 超强灰鸽.00404394
0045A18F 8BD0 mov edx,eax
0045A191 8D45 BC lea eax,dword ptr ss:[ebp-44]
0045A194 E8 339FFAFF call 超强灰鸽.004040CC
0045A199 8B45 BC mov eax,dword ptr ss:[ebp-44]
0045A19C E8 43E3FAFF call 超强灰鸽.004084E4
; 删除病毒体
0045A1A1 EB 42 jmp short 超强灰鸽.0045A1E5
0045A1A3 8B83 FC020000 mov eax,dword ptr ds:[ebx+2FC]
0045A1A9 8B80 20020000 mov eax,dword ptr ds:[eax+220]
0045A1AF BA A4A34500 mov edx,超强灰鸽.0045A3A4
0045A1B4 8B08 mov ecx,dword ptr ds:[eax]
0045A1B6 FF51 38 call dword ptr ds:[ecx+38]
0045A1B9 EB 2A jmp short 超强灰鸽.0045A1E5
处理完毕啦。。。。
0045A1E5 33C0 xor eax,eax
0045A1E7 5A pop edx
0045A1E8 59 pop ecx
0045A1E9 59 pop ecx
0045A1EA 64:8910 mov dword ptr fs:[eax],edx
0045A1ED 68 07A24500 push 超强灰鸽.0045A207
0045A1F2 8D45 B8 lea eax,dword ptr ss:[ebp-48]
0045A1F5 BA 12000000 mov edx,12
0045A1FA E8 F99CFAFF call 超强灰鸽.00403EF8
0045A1FF C3 retn
总结:
该检测器通过OpenFileMappingA()函数检测指定的映射对象是否存在作判断,如存在,获取VIP用户名,继续检测隐藏的进程模块,获取其进程ID,映像出具体文件名(继而作相应的文件完整路径的组合),进行权限提升(打开令牌环,设置系统调试权限),PostMessageA()发送消息关闭隐藏进程主窗口,处理服务进程,取消病毒文件的所有属性(系统,隐藏,只读),最后删除病毒体!!!
检测器代码采用Borland Delphi编写,看这些反汇编代码总会碰到层层调用这一现象,在这些主要CALL的注释中,其实其内部的调用还有很多较详细的代码调用,限于篇幅,就不一一列举了.
此外, 由于本人能力的有限,错误及遗漏在所难免! 或许检测器原理并没有这么简单,还请检测器程序的编写作者或其他高手作出指点. 万分感谢!
