Actor(s): Sowbug
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rule win_felismus_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" 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 = "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 = { 8bfe 53 8b1d???????? 68???????? 56 f3ab ffd3 } // n = 7, score = 100 // 8bfe | mov edi, esi // 53 | push ebx // 8b1d???????? | // 68???????? | // 56 | push esi // f3ab | rep stosd dword ptr es:[edi], eax // ffd3 | call ebx $sequence_1 = { c744241408000000 7514 8d8c24a8030000 51 e8???????? 83c404 84c0 } // n = 7, score = 100 // c744241408000000 | mov dword ptr [esp + 0x14], 8 // 7514 | jne 0x16 // 8d8c24a8030000 | lea ecx, dword ptr [esp + 0x3a8] // 51 | push ecx // e8???????? | // 83c404 | add esp, 4 // 84c0 | test al, al $sequence_2 = { c60000 6a11 ff15???????? 8bf0 } // n = 4, score = 100 // c60000 | mov byte ptr [eax], 0 // 6a11 | push 0x11 // ff15???????? | // 8bf0 | mov esi, eax $sequence_3 = { 52 ffd6 8b4514 8b35???????? 50 } // n = 5, score = 100 // 52 | push edx // ffd6 | call esi // 8b4514 | mov eax, dword ptr [ebp + 0x14] // 8b35???????? | // 50 | push eax $sequence_4 = { 1bc0 83d8ff 3bc3 7451 bf???????? } // n = 5, score = 100 // 1bc0 | sbb eax, eax // 83d8ff | sbb eax, -1 // 3bc3 | cmp eax, ebx // 7451 | je 0x53 // bf???????? | $sequence_5 = { 66ab aa b9ff000000 33c0 8dbc2415010000 } // n = 5, score = 100 // 66ab | stosw word ptr es:[edi], ax // aa | stosb byte ptr es:[edi], al // b9ff000000 | mov ecx, 0xff // 33c0 | xor eax, eax // 8dbc2415010000 | lea edi, dword ptr [esp + 0x115] $sequence_6 = { f3ab ffd3 68???????? 56 ff15???????? 68ff000000 8bf8 } // n = 7, score = 100 // f3ab | rep stosd dword ptr es:[edi], eax // ffd3 | call ebx // 68???????? | // 56 | push esi // ff15???????? | // 68ff000000 | push 0xff // 8bf8 | mov edi, eax $sequence_7 = { 6888130000 ff15???????? 57 ffd3 8bf0 83c404 85f6 } // n = 7, score = 100 // 6888130000 | push 0x1388 // ff15???????? | // 57 | push edi // ffd3 | call ebx // 8bf0 | mov esi, eax // 83c404 | add esp, 4 // 85f6 | test esi, esi $sequence_8 = { 50 ffd7 6a04 6800100000 6814030000 6a00 56 } // n = 7, score = 100 // 50 | push eax // ffd7 | call edi // 6a04 | push 4 // 6800100000 | push 0x1000 // 6814030000 | push 0x314 // 6a00 | push 0 // 56 | push esi $sequence_9 = { 8d942414010000 68???????? 52 ffd6 8d842414010000 8d8c241c030000 } // n = 6, score = 100 // 8d942414010000 | lea edx, dword ptr [esp + 0x114] // 68???????? | // 52 | push edx // ffd6 | call esi // 8d842414010000 | lea eax, dword ptr [esp + 0x114] // 8d8c241c030000 | lea ecx, dword ptr [esp + 0x31c] condition: 7 of them and filesize < 204800 }
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