Actor(s): Sowbug
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rule win_felismus_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.felismus." 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.felismus" malpedia_rule_date = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 = { 6a00 51 6a02 68???????? } // n = 4, score = 100 // 6a00 | push 0 // 51 | push ecx // 6a02 | push 2 // 68???????? | $sequence_1 = { 8b4c2448 8bd0 d3ea 8b0d???????? d3e0 8bcf 0bd0 } // n = 7, score = 100 // 8b4c2448 | mov ecx, dword ptr [esp + 0x48] // 8bd0 | mov edx, eax // d3ea | shr edx, cl // 8b0d???????? | // d3e0 | shl eax, cl // 8bcf | mov ecx, edi // 0bd0 | or edx, eax $sequence_2 = { 0f8fde030000 6a11 ff15???????? 8bf0 83c404 85f6 0f84f8030000 } // n = 7, score = 100 // 0f8fde030000 | jg 0x3e4 // 6a11 | push 0x11 // ff15???????? | // 8bf0 | mov esi, eax // 83c404 | add esp, 4 // 85f6 | test esi, esi // 0f84f8030000 | je 0x3fe $sequence_3 = { 8bd7 33c9 8a4c3408 8bc1 83e10f c1e804 42 } // n = 7, score = 100 // 8bd7 | mov edx, edi // 33c9 | xor ecx, ecx // 8a4c3408 | mov cl, byte ptr [esp + esi + 8] // 8bc1 | mov eax, ecx // 83e10f | and ecx, 0xf // c1e804 | shr eax, 4 // 42 | inc edx $sequence_4 = { d3e7 0bc7 03c6 8b7c2430 8bca f7d1 0bc8 } // n = 7, score = 100 // d3e7 | shl edi, cl // 0bc7 | or eax, edi // 03c6 | add eax, esi // 8b7c2430 | mov edi, dword ptr [esp + 0x30] // 8bca | mov ecx, edx // f7d1 | not ecx // 0bc8 | or ecx, eax $sequence_5 = { 0bd0 8bc7 03d3 f7d0 23c3 23ca 0bc1 } // n = 7, score = 100 // 0bd0 | or edx, eax // 8bc7 | mov eax, edi // 03d3 | add edx, ebx // f7d0 | not eax // 23c3 | and eax, ebx // 23ca | and ecx, edx // 0bc1 | or eax, ecx $sequence_6 = { 8b4518 83c404 890a 50 56 894a04 894a08 } // n = 7, score = 100 // 8b4518 | mov eax, dword ptr [ebp + 0x18] // 83c404 | add esp, 4 // 890a | mov dword ptr [edx], ecx // 50 | push eax // 56 | push esi // 894a04 | mov dword ptr [edx + 4], ecx // 894a08 | mov dword ptr [edx + 8], ecx $sequence_7 = { 8bd0 894c2450 d3ea 8b0d???????? d3e0 8b4c2428 0bd0 } // n = 7, score = 100 // 8bd0 | mov edx, eax // 894c2450 | mov dword ptr [esp + 0x50], ecx // d3ea | shr edx, cl // 8b0d???????? | // d3e0 | shl eax, cl // 8b4c2428 | mov ecx, dword ptr [esp + 0x28] // 0bd0 | or edx, eax $sequence_8 = { 8b442410 25ff000000 41 83fd02 8a907c520110 8851ff 7d11 } // n = 7, score = 100 // 8b442410 | mov eax, dword ptr [esp + 0x10] // 25ff000000 | and eax, 0xff // 41 | inc ecx // 83fd02 | cmp ebp, 2 // 8a907c520110 | mov dl, byte ptr [eax + 0x1001527c] // 8851ff | mov byte ptr [ecx - 1], dl // 7d11 | jge 0x13 $sequence_9 = { 53 681f010200 53 53 53 8b550c 52 } // n = 7, score = 100 // 53 | push ebx // 681f010200 | push 0x2011f // 53 | push ebx // 53 | push ebx // 53 | push ebx // 8b550c | mov edx, dword ptr [ebp + 0xc] // 52 | push edx condition: 7 of them and filesize < 204800 }
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