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rule win_pitou_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.pitou." 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.pitou" 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 = { ac 8bda c1e305 03c3 8bda c1eb02 } // n = 6, score = 700 // ac | mov edx, dword ptr [ebp - 0x24] // 8bda | push edx // c1e305 | mov eax, dword ptr [ebp - 0x1c] // 03c3 | mov dword ptr [eax + 8], 0 // 8bda | mov ecx, dword ptr [ebp - 0x1c] // c1eb02 | mov edx, dword ptr [ebp - 0x24] $sequence_1 = { 80f457 8acc 80e103 8aec c0ed03 } // n = 5, score = 700 // 80f457 | push eax // 8acc | call ebx // 80e103 | push edi // 8aec | push 2 // c0ed03 | lea ecx, [ebp - 0x18] $sequence_2 = { ac 8bda c1e305 03c3 } // n = 4, score = 700 // ac | lcall 0x1536:0xed56af10 // 8bda | cmp esi, dword ptr [ebx] // c1e305 | pop edx // 03c3 | pop ss $sequence_3 = { 8bda c1e305 03c3 8bda } // n = 4, score = 700 // 8bda | mov edx, dword ptr [ebp + 0xc] // c1e305 | mov dword ptr [edx + 0x514], eax // 03c3 | cmp eax, ebx // 8bda | jne 0xfffe613c $sequence_4 = { 8acc 80e103 8aec c0ed03 80e507 } // n = 5, score = 700 // 8acc | cmp dword ptr [ebp - 8], 8 // 80e103 | test al, al // 8aec | jne 0xf8be // c0ed03 | and ecx, 0xf0 // 80e507 | cmp cl, 0xe0 $sequence_5 = { c1e305 03c3 8bda c1eb02 03c3 } // n = 5, score = 700 // c1e305 | je 0xffff21f7 // 03c3 | mov dword ptr [esi + 8], 0x110 // 8bda | mov dword ptr [esi], 0 // c1eb02 | mov esi, eax // 03c3 | test esi, esi $sequence_6 = { 80f457 8acc 80e103 8aec } // n = 4, score = 700 // 80f457 | push ss // 8acc | aas // 80e103 | imul dword ptr [ecx - 0x7d] // 8aec | push edi $sequence_7 = { c1e305 03c3 8bda c1eb02 03c3 33d0 } // n = 6, score = 700 // c1e305 | push eax // 03c3 | call edi // 8bda | mov eax, dword ptr [esi + 0x28c] // c1eb02 | mov eax, dword ptr [esi + 0x28c] // 03c3 | test eax, eax // 33d0 | je 0xfffffe8e $sequence_8 = { ac 8bda c1e305 03c3 8bda c1eb02 03c3 } // n = 7, score = 700 // ac | mov dl, byte ptr [edi + eax + 1] // 8bda | inc eax // c1e305 | cmp dl, byte ptr [eax] // 03c3 | mov dl, byte ptr [edi + eax] // 8bda | mov dword ptr [ebp - 0x1c], edi // c1eb02 | cmp dl, byte ptr [eax] // 03c3 | jne 0x11478 $sequence_9 = { c1e305 03c3 8bda c1eb02 } // n = 4, score = 700 // c1e305 | cmp ecx, eax // 03c3 | jb 0x99c5 // 8bda | adc ecx, esi // c1eb02 | cmp ecx, eax condition: 7 of them and filesize < 1106944 }
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