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rule win_whiskerspy_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.whiskerspy." 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.whiskerspy" malpedia_rule_date = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { 33ff 8b06 8bcf d3e8 } // n = 4, score = 300 // 33ff | xor edi, edi // 8b06 | mov eax, dword ptr [esi] // 8bcf | mov ecx, edi // d3e8 | shr eax, cl $sequence_1 = { 72e8 488d4ddc ff15???????? 488bc8 } // n = 4, score = 200 // 72e8 | inc esp // 488d4ddc | movzx ecx, word ptr [ebp - 0xe] // ff15???????? | // 488bc8 | inc esp $sequence_2 = { 72e8 488d442440 4889bd40020000 4533c9 } // n = 4, score = 200 // 72e8 | movzx ecx, word ptr [ebp - 6] // 488d442440 | movzx edx, word ptr [ebp - 8] // 4889bd40020000 | jb 0xffffffea // 4533c9 | movzx eax, word ptr [ebp - 4] $sequence_3 = { 72e4 488d95ec000000 488d8d20030000 ff15???????? } // n = 4, score = 200 // 72e4 | mov ecx, edi // 488d95ec000000 | jb 0xffffffe6 // 488d8d20030000 | dec eax // ff15???????? | $sequence_4 = { 72e8 488d5548 498bcc e8???????? } // n = 4, score = 200 // 72e8 | xor ecx, ecx // 488d5548 | dec eax // 498bcc | mov dword ptr [ebp + 0x238], eax // e8???????? | $sequence_5 = { 72e8 0fb745fc 0fb74dfa 0fb755f8 } // n = 4, score = 200 // 72e8 | dec eax // 0fb745fc | lea ecx, [ebp + 0x320] // 0fb74dfa | mov byte ptr [ebp + 0x9b], 0x7f // 0fb755f8 | jb 0xfffffffb $sequence_6 = { 72e8 488d557f 488bcf e8???????? } // n = 4, score = 200 // 72e8 | lea eax, [esp + 0x40] // 488d557f | dec eax // 488bcf | mov dword ptr [ebp + 0x240], edi // e8???????? | $sequence_7 = { 72e4 488d95c2000000 488d8dc0030000 ff15???????? } // n = 4, score = 200 // 72e4 | jb 0xffffffe6 // 488d95c2000000 | dec eax // 488d8dc0030000 | lea edx, [ebp + 0xc2] // ff15???????? | $sequence_8 = { 0110 eb23 8b4508 8b11 } // n = 4, score = 100 // 0110 | xor ecx, ecx // eb23 | dec eax // 8b4508 | mov dword ptr [ebp + 0x238], eax // 8b11 | jb 0xffffffea $sequence_9 = { 0110 8b4508 eb25 8b01 ff501c 0fb7c8 b8ffff0000 } // n = 7, score = 100 // 0110 | xor ecx, ecx // 8b4508 | jb 0xffffffea // eb25 | dec eax // 8b01 | lea eax, [esp + 0x40] // ff501c | dec eax // 0fb7c8 | mov dword ptr [ebp + 0x240], edi // b8ffff0000 | inc ebp $sequence_10 = { 0144241c 2bd8 83c410 8bd3 } // n = 4, score = 100 // 0144241c | mov edx, 0xec0e4e8e // 2bd8 | dec eax // 83c410 | mov edi, eax // 8bd3 | jb 0xffffffea $sequence_11 = { 0130 8b7510 83794c00 8bd3 } // n = 4, score = 100 // 0130 | mov dword ptr [ebp + 0x238], eax // 8b7510 | inc ebp // 83794c00 | xor eax, eax // 8bd3 | mov dword ptr [esp + 0x50], edi $sequence_12 = { 015508 85ff 0f8f6cffffff 7c08 } // n = 4, score = 100 // 015508 | jb 0xffffffea // 85ff | dec eax // 0f8f6cffffff | lea edx, [ebp + 0x48] // 7c08 | dec ecx $sequence_13 = { 015dd0 eb09 51 8d4dcc } // n = 4, score = 100 // 015dd0 | dec eax // eb09 | mov ecx, edi // 51 | dec ecx // 8d4dcc | mov ecx, ebp $sequence_14 = { 015de8 eb09 50 8d4de4 } // n = 4, score = 100 // 015de8 | mov ecx, esp // eb09 | jb 0xffffffea // 50 | dec eax // 8d4de4 | lea edx, [ebp - 0x3c] condition: 7 of them and filesize < 591872 }
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