There is no description at this point.
rule win_iisniff_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" version = "1" description = "Detects win.iisniff." info = "autogenerated rule brought to you by yara-signator" tool = "yara-signator v0.6.0" signator_config = "callsandjumps;datarefs;binvalue" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.iisniff" malpedia_rule_date = "20220405" malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a" malpedia_version = "20220411" malpedia_license = "CC BY-SA 4.0" malpedia_sharing = "TLP:WHITE" /* DISCLAIMER * The strings used in this rule have been automatically selected from the * disassembly of memory dumps and unpacked files, using YARA-Signator. * The code and documentation is published here: * https://github.com/fxb-cocacoding/yara-signator * As Malpedia is used as data source, please note that for a given * number of families, only single samples are documented. * This likely impacts the degree of generalization these rules will offer. * Take the described generation method also into consideration when you * apply the rules in your use cases and assign them confidence levels. */ strings: $sequence_0 = { 50 8d842494000000 64a300000000 80bc24a400000000 } // n = 4, score = 200 // 50 | push eax // 8d842494000000 | lea eax, dword ptr [esp + 0x94] // 64a300000000 | mov dword ptr fs:[0], eax // 80bc24a400000000 | cmp byte ptr [esp + 0xa4], 0 $sequence_1 = { 51 e8???????? 33ff 57 bb0f000000 } // n = 5, score = 200 // 51 | push ecx // e8???????? | // 33ff | xor edi, edi // 57 | push edi // bb0f000000 | mov ebx, 0xf $sequence_2 = { ebba 8b474c 85c0 7504 8bc6 } // n = 5, score = 200 // ebba | jmp 0xffffffbc // 8b474c | mov eax, dword ptr [edi + 0x4c] // 85c0 | test eax, eax // 7504 | jne 6 // 8bc6 | mov eax, esi $sequence_3 = { 6a03 68000000c0 68???????? ff15???????? 6a02 } // n = 5, score = 200 // 6a03 | push 3 // 68000000c0 | push 0xc0000000 // 68???????? | // ff15???????? | // 6a02 | push 2 $sequence_4 = { 8d460c 8b4f68 50 51 e8???????? 83c408 } // n = 6, score = 200 // 8d460c | lea eax, dword ptr [esi + 0xc] // 8b4f68 | mov ecx, dword ptr [edi + 0x68] // 50 | push eax // 51 | push ecx // e8???????? | // 83c408 | add esp, 8 $sequence_5 = { 3bc6 89442414 0f8d96000000 8d8424dc000000 } // n = 4, score = 200 // 3bc6 | cmp eax, esi // 89442414 | mov dword ptr [esp + 0x14], eax // 0f8d96000000 | jge 0x9c // 8d8424dc000000 | lea eax, dword ptr [esp + 0xdc] $sequence_6 = { 8b4c2414 8bc2 8bd6 e8???????? 85c0 } // n = 5, score = 200 // 8b4c2414 | mov ecx, dword ptr [esp + 0x14] // 8bc2 | mov eax, edx // 8bd6 | mov edx, esi // e8???????? | // 85c0 | test eax, eax $sequence_7 = { 8b742414 3b7014 7505 e8???????? } // n = 4, score = 200 // 8b742414 | mov esi, dword ptr [esp + 0x14] // 3b7014 | cmp esi, dword ptr [eax + 0x14] // 7505 | jne 7 // e8???????? | $sequence_8 = { 807de800 7507 be04000000 eb69 c645fc01 8b0f } // n = 6, score = 200 // 807de800 | cmp byte ptr [ebp - 0x18], 0 // 7507 | jne 9 // be04000000 | mov esi, 4 // eb69 | jmp 0x6b // c645fc01 | mov byte ptr [ebp - 4], 1 // 8b0f | mov ecx, dword ptr [edi] $sequence_9 = { 8365fc00 837d1000 57 8bf9 7e5f } // n = 5, score = 200 // 8365fc00 | and dword ptr [ebp - 4], 0 // 837d1000 | cmp dword ptr [ebp + 0x10], 0 // 57 | push edi // 8bf9 | mov edi, ecx // 7e5f | jle 0x61 $sequence_10 = { ff5010 8b38 6a01 56 89442420 } // n = 5, score = 200 // ff5010 | call dword ptr [eax + 0x10] // 8b38 | mov edi, dword ptr [eax] // 6a01 | push 1 // 56 | push esi // 89442420 | mov dword ptr [esp + 0x20], eax $sequence_11 = { 50 8d442470 64a300000000 8b5d08 83ceff } // n = 5, score = 200 // 50 | push eax // 8d442470 | lea eax, dword ptr [esp + 0x70] // 64a300000000 | mov dword ptr fs:[0], eax // 8b5d08 | mov ebx, dword ptr [ebp + 8] // 83ceff | or esi, 0xffffffff $sequence_12 = { 8b54240c 52 e8???????? 8b4f08 8b9780000000 83c404 8bd8 } // n = 7, score = 200 // 8b54240c | mov edx, dword ptr [esp + 0xc] // 52 | push edx // e8???????? | // 8b4f08 | mov ecx, dword ptr [edi + 8] // 8b9780000000 | mov edx, dword ptr [edi + 0x80] // 83c404 | add esp, 4 // 8bd8 | mov ebx, eax $sequence_13 = { e8???????? 8b07 8b4004 03c7 395808 0f9445e8 33f6 } // n = 7, score = 200 // e8???????? | // 8b07 | mov eax, dword ptr [edi] // 8b4004 | mov eax, dword ptr [eax + 4] // 03c7 | add eax, edi // 395808 | cmp dword ptr [eax + 8], ebx // 0f9445e8 | sete byte ptr [ebp - 0x18] // 33f6 | xor esi, esi $sequence_14 = { e8???????? 3b3d???????? 7428 8b4704 8b0f 8908 } // n = 6, score = 200 // e8???????? | // 3b3d???????? | // 7428 | je 0x2a // 8b4704 | mov eax, dword ptr [edi + 4] // 8b0f | mov ecx, dword ptr [edi] // 8908 | mov dword ptr [eax], ecx condition: 7 of them and filesize < 1441792 }
If your designated proposal does not fit in any other category, feel free to write a free-text in the comment field below.
Please propose all changes regarding references on the Malpedia library page
Your suggestion will be reviewed before being published. Thank you for contributing!
YYYY-MM-DD
YYYY-MM
YYYY