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rule win_iisniff_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" 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 = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { 2bc2 51 8d942410010000 52 8b8e84000000 89442418 8b4608 } // n = 7, score = 200 // 2bc2 | sub eax, edx // 51 | push ecx // 8d942410010000 | lea edx, [esp + 0x110] // 52 | push edx // 8b8e84000000 | mov ecx, dword ptr [esi + 0x84] // 89442418 | mov dword ptr [esp + 0x18], eax // 8b4608 | mov eax, dword ptr [esi + 8] $sequence_1 = { 85f6 7fe6 0fb675d3 ebb2 55 } // n = 5, score = 200 // 85f6 | test esi, esi // 7fe6 | jg 0xffffffe8 // 0fb675d3 | movzx esi, byte ptr [ebp - 0x2d] // ebb2 | jmp 0xffffffb4 // 55 | push ebp $sequence_2 = { 83c404 8b442420 c78424c40000000f000000 c78424c000000000000000 c68424b000000000 8b4804 } // n = 6, score = 200 // 83c404 | add esp, 4 // 8b442420 | mov eax, dword ptr [esp + 0x20] // c78424c40000000f000000 | mov dword ptr [esp + 0xc4], 0xf // c78424c000000000000000 | mov dword ptr [esp + 0xc0], 0 // c68424b000000000 | mov byte ptr [esp + 0xb0], 0 // 8b4804 | mov ecx, dword ptr [eax + 4] $sequence_3 = { eb05 1bc0 83d8ff 85c0 0f851e020000 56 e8???????? } // n = 7, score = 200 // eb05 | jmp 7 // 1bc0 | sbb eax, eax // 83d8ff | sbb eax, -1 // 85c0 | test eax, eax // 0f851e020000 | jne 0x224 // 56 | push esi // e8???????? | $sequence_4 = { e8???????? eb02 33db 8b44240c 6a20 56 895e24 } // n = 7, score = 200 // e8???????? | // eb02 | jmp 4 // 33db | xor ebx, ebx // 8b44240c | mov eax, dword ptr [esp + 0xc] // 6a20 | push 0x20 // 56 | push esi // 895e24 | mov dword ptr [esi + 0x24], ebx $sequence_5 = { 50 ffd1 85c0 7413 } // n = 4, score = 200 // 50 | push eax // ffd1 | call ecx // 85c0 | test eax, eax // 7413 | je 0x15 $sequence_6 = { 0f840a010000 6aff 56 8b750c } // n = 4, score = 200 // 0f840a010000 | je 0x110 // 6aff | push -1 // 56 | push esi // 8b750c | mov esi, dword ptr [ebp + 0xc] $sequence_7 = { 8bcb 8974242c 89742430 89742454 ff503c } // n = 5, score = 200 // 8bcb | mov ecx, ebx // 8974242c | mov dword ptr [esp + 0x2c], esi // 89742430 | mov dword ptr [esp + 0x30], esi // 89742454 | mov dword ptr [esp + 0x54], esi // ff503c | call dword ptr [eax + 0x3c] $sequence_8 = { e9???????? 56 8bf0 83c65c 8bce e8???????? 56 } // n = 7, score = 200 // e9???????? | // 56 | push esi // 8bf0 | mov esi, eax // 83c65c | add esi, 0x5c // 8bce | mov ecx, esi // e8???????? | // 56 | push esi $sequence_9 = { e9???????? 8b07 8d4c241c 51 8d4c243c } // n = 5, score = 200 // e9???????? | // 8b07 | mov eax, dword ptr [edi] // 8d4c241c | lea ecx, [esp + 0x1c] // 51 | push ecx // 8d4c243c | lea ecx, [esp + 0x3c] $sequence_10 = { 39bc24bc000000 7307 8d8424a8000000 8b8e84000000 6a01 8d542410 52 } // n = 7, score = 200 // 39bc24bc000000 | cmp dword ptr [esp + 0xbc], edi // 7307 | jae 9 // 8d8424a8000000 | lea eax, [esp + 0xa8] // 8b8e84000000 | mov ecx, dword ptr [esi + 0x84] // 6a01 | push 1 // 8d542410 | lea edx, [esp + 0x10] // 52 | push edx $sequence_11 = { 6a03 68000000c0 68???????? ff15???????? 6a02 } // n = 5, score = 200 // 6a03 | push 3 // 68000000c0 | push 0xc0000000 // 68???????? | // ff15???????? | // 6a02 | push 2 $sequence_12 = { 33cc e8???????? 8be5 5d c20800 ff742418 } // n = 6, score = 200 // 33cc | xor ecx, esp // e8???????? | // 8be5 | mov esp, ebp // 5d | pop ebp // c20800 | ret 8 // ff742418 | push dword ptr [esp + 0x18] $sequence_13 = { 8b5608 8944240c 6a01 8d442410 } // n = 4, score = 200 // 8b5608 | mov edx, dword ptr [esi + 8] // 8944240c | mov dword ptr [esp + 0xc], eax // 6a01 | push 1 // 8d442410 | lea eax, [esp + 0x10] $sequence_14 = { 8b10 56 56 ff742420 8bc8 56 } // n = 6, score = 200 // 8b10 | mov edx, dword ptr [eax] // 56 | push esi // 56 | push esi // ff742420 | push dword ptr [esp + 0x20] // 8bc8 | mov ecx, eax // 56 | push esi condition: 7 of them and filesize < 1441792 }
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