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rule win_pitou_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" 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 = "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 = { 8a6201 80f457 8acc 80e103 8aec c0ed03 } // n = 6, score = 700 // 8a6201 | mov ecx, dword ptr [ebp + 0xc] // 80f457 | mov eax, dword ptr [ecx + 0x60] // 8acc | push ebx // 80e103 | push esi // 8aec | sub esp, 0x28 // c0ed03 | push ebx $sequence_1 = { 8bda c1e305 03c3 8bda c1eb02 03c3 } // n = 6, score = 700 // 8bda | mov dword ptr [ebp - 8], ebx // c1e305 | mov al, byte ptr [ebx + 0x1f] // 03c3 | test al, al // 8bda | je 0xfffef583 // c1eb02 | dec al // 03c3 | mov byte ptr [ebx + 0x1f], al $sequence_2 = { 8bc2 5e 5a 59 5b } // n = 5, score = 700 // 8bc2 | jbe 0xffff5943 // 5e | push ebx // 5a | push ebx // 59 | mov eax, dword ptr [esi + 8] // 5b | cmp eax, 2 $sequence_3 = { 8a6201 80f457 8acc 80e103 8aec c0ed03 80e507 } // n = 7, score = 700 // 8a6201 | add esp, 0xc // 80f457 | sub esp, 0x44 // 8acc | push ebx // 80e103 | push esi // 8aec | push edi // c0ed03 | mov dword ptr [ebp - 0x18], esp // 80e507 | mov edi, ecx $sequence_4 = { 80e103 8aec c0ed03 80e507 } // n = 4, score = 700 // 80e103 | lcall 0x1f9c:0x3321210 // 8aec | xchg eax, ecx // c0ed03 | sal esp, 0x69 // 80e507 | pop esi $sequence_5 = { 8acc 80e103 8aec c0ed03 } // n = 4, score = 700 // 8acc | jge 0x1d2cb // 80e103 | inc ecx // 8aec | dec eax // c0ed03 | inc ecx $sequence_6 = { 33c0 ac 8bda c1e305 03c3 8bda } // n = 6, score = 700 // 33c0 | add ebx, dword ptr [edx + 0x5f539f16] // ac | adc eax, 0x145a143e // 8bda | push ss // c1e305 | add ebx, dword ptr [edx + 0x175a1417] // 03c3 | add ebx, dword ptr [edx + 0x579f1417] // 8bda | push edi $sequence_7 = { 33c0 ac 8bda c1e305 03c3 } // n = 5, score = 700 // 33c0 | int1 // ac | imul eax, esi, 0xfa5029e8 // 8bda | sbb eax, 0x9c03102a // c1e305 | das // 03c3 | push cs $sequence_8 = { 8bda c1e305 03c3 8bda } // n = 4, score = 700 // 8bda | mov ecx, dword ptr [ebp - 4] // c1e305 | mov ebx, eax // 03c3 | lea eax, [ebp - 4] // 8bda | push eax $sequence_9 = { 80f457 8acc 80e103 8aec c0ed03 80e507 } // n = 6, score = 700 // 80f457 | imul eax, dword ptr [edi], 0x13a91795 // 8acc | push edi // 80e103 | push ebx // 8aec | sub al, 0x32 // c0ed03 | add ebx, dword ptr [edx + 0x1415da16] // 80e507 | movups xmm0, xmmword ptr [ebx] condition: 7 of them and filesize < 1106944 }
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