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rule win_mosaic_regressor_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.mosaic_regressor." 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.mosaic_regressor" 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 = { 6a00 668917 ffd5 6a00 } // n = 4, score = 100 // 6a00 | push 0 // 668917 | mov word ptr [edi], dx // ffd5 | call ebp // 6a00 | push 0 $sequence_1 = { 741f 6a00 8d45f8 50 8d34fd24aa0010 ff36 e8???????? } // n = 7, score = 100 // 741f | je 0x21 // 6a00 | push 0 // 8d45f8 | lea eax, [ebp - 8] // 50 | push eax // 8d34fd24aa0010 | lea esi, [edi*8 + 0x1000aa24] // ff36 | push dword ptr [esi] // e8???????? | $sequence_2 = { 8bff 55 8bec 8b4508 ff34c578a10010 ff15???????? 5d } // n = 7, score = 100 // 8bff | mov edi, edi // 55 | push ebp // 8bec | mov ebp, esp // 8b4508 | mov eax, dword ptr [ebp + 8] // ff34c578a10010 | push dword ptr [eax*8 + 0x1000a178] // ff15???????? | // 5d | pop ebp $sequence_3 = { 897e70 c686c800000043 c6864b01000043 c7466890a30010 6a0d e8???????? 59 } // n = 7, score = 100 // 897e70 | mov dword ptr [esi + 0x70], edi // c686c800000043 | mov byte ptr [esi + 0xc8], 0x43 // c6864b01000043 | mov byte ptr [esi + 0x14b], 0x43 // c7466890a30010 | mov dword ptr [esi + 0x68], 0x1000a390 // 6a0d | push 0xd // e8???????? | // 59 | pop ecx $sequence_4 = { 8b15???????? 89480c 8b0d???????? 895010 894814 } // n = 5, score = 100 // 8b15???????? | // 89480c | mov dword ptr [eax + 0xc], ecx // 8b0d???????? | // 895010 | mov dword ptr [eax + 0x10], edx // 894814 | mov dword ptr [eax + 0x14], ecx $sequence_5 = { 8bec 8b4508 ff34c578a10010 ff15???????? 5d c3 6a0c } // n = 7, score = 100 // 8bec | mov ebp, esp // 8b4508 | mov eax, dword ptr [ebp + 8] // ff34c578a10010 | push dword ptr [eax*8 + 0x1000a178] // ff15???????? | // 5d | pop ebp // c3 | ret // 6a0c | push 0xc $sequence_6 = { 7d10 8a8c181d010000 8888b8a60010 40 ebe6 ff35???????? ff15???????? } // n = 7, score = 100 // 7d10 | jge 0x12 // 8a8c181d010000 | mov cl, byte ptr [eax + ebx + 0x11d] // 8888b8a60010 | mov byte ptr [eax + 0x1000a6b8], cl // 40 | inc eax // ebe6 | jmp 0xffffffe8 // ff35???????? | // ff15???????? | $sequence_7 = { 8bec 8b4508 33c9 3b04cdb0a80010 7413 41 83f92d } // n = 7, score = 100 // 8bec | mov ebp, esp // 8b4508 | mov eax, dword ptr [ebp + 8] // 33c9 | xor ecx, ecx // 3b04cdb0a80010 | cmp eax, dword ptr [ecx*8 + 0x1000a8b0] // 7413 | je 0x15 // 41 | inc ecx // 83f92d | cmp ecx, 0x2d $sequence_8 = { 8d8c246c010000 51 6a00 ffd5 8d842464010000 48 8d4900 } // n = 7, score = 100 // 8d8c246c010000 | lea ecx, [esp + 0x16c] // 51 | push ecx // 6a00 | push 0 // ffd5 | call ebp // 8d842464010000 | lea eax, [esp + 0x164] // 48 | dec eax // 8d4900 | lea ecx, [ecx] $sequence_9 = { c1e902 f3a5 8bc8 83e103 f3a4 8dbc246c020000 4f } // n = 7, score = 100 // c1e902 | shr ecx, 2 // f3a5 | rep movsd dword ptr es:[edi], dword ptr [esi] // 8bc8 | mov ecx, eax // 83e103 | and ecx, 3 // f3a4 | rep movsb byte ptr es:[edi], byte ptr [esi] // 8dbc246c020000 | lea edi, [esp + 0x26c] // 4f | dec edi condition: 7 of them and filesize < 113664 }
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