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rule win_roopy_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.roopy." 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.roopy" 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 = { 55 89c5 8d8588fdffff e8???????? 5d c3 55 } // n = 7, score = 300 // 55 | push ebp // 89c5 | mov ebp, eax // 8d8588fdffff | lea eax, [ebp - 0x278] // e8???????? | // 5d | pop ebp // c3 | ret // 55 | push ebp $sequence_1 = { 8b45f8 66c740541c00 c745f401000000 837df800 7411 837dfc00 740b } // n = 7, score = 300 // 8b45f8 | mov eax, dword ptr [ebp - 8] // 66c740541c00 | mov word ptr [eax + 0x54], 0x1c // c745f401000000 | mov dword ptr [ebp - 0xc], 1 // 837df800 | cmp dword ptr [ebp - 8], 0 // 7411 | je 0x13 // 837dfc00 | cmp dword ptr [ebp - 4], 0 // 740b | je 0xd $sequence_2 = { 83ae8800000001 8d7600 eb39 89f0 e8???????? 84c0 740c } // n = 7, score = 300 // 83ae8800000001 | sub dword ptr [esi + 0x88], 1 // 8d7600 | lea esi, [esi] // eb39 | jmp 0x3b // 89f0 | mov eax, esi // e8???????? | // 84c0 | test al, al // 740c | je 0xe $sequence_3 = { e8???????? 8d45d8 30c9 6631d2 e8???????? 6a00 8b45ec } // n = 7, score = 300 // e8???????? | // 8d45d8 | lea eax, [ebp - 0x28] // 30c9 | xor cl, cl // 6631d2 | xor dx, dx // e8???????? | // 6a00 | push 0 // 8b45ec | mov eax, dword ptr [ebp - 0x14] $sequence_4 = { dd5dd0 dd45d0 8d6424f8 dd1c24 8b45fc 8b4020 8b55fc } // n = 7, score = 300 // dd5dd0 | fstp qword ptr [ebp - 0x30] // dd45d0 | fld qword ptr [ebp - 0x30] // 8d6424f8 | lea esp, [esp - 8] // dd1c24 | fstp qword ptr [esp] // 8b45fc | mov eax, dword ptr [ebp - 4] // 8b4020 | mov eax, dword ptr [eax + 0x20] // 8b55fc | mov edx, dword ptr [ebp - 4] $sequence_5 = { 53 89c5 8d6424fc 8b45fc e8???????? 80bdacfeffff00 0f8454010000 } // n = 7, score = 300 // 53 | push ebx // 89c5 | mov ebp, eax // 8d6424fc | lea esp, [esp - 4] // 8b45fc | mov eax, dword ptr [ebp - 4] // e8???????? | // 80bdacfeffff00 | cmp byte ptr [ebp - 0x154], 0 // 0f8454010000 | je 0x15a $sequence_6 = { 8b40fc 3d04010000 0f8e91000000 89da b901000000 b8???????? e8???????? } // n = 7, score = 300 // 8b40fc | mov eax, dword ptr [eax - 4] // 3d04010000 | cmp eax, 0x104 // 0f8e91000000 | jle 0x97 // 89da | mov edx, ebx // b901000000 | mov ecx, 1 // b8???????? | // e8???????? | $sequence_7 = { e8???????? a1???????? 85c0 7404 8b40fc 40 } // n = 6, score = 300 // e8???????? | // a1???????? | // 85c0 | test eax, eax // 7404 | je 6 // 8b40fc | mov eax, dword ptr [eax - 4] // 40 | inc eax $sequence_8 = { 648920 8b45f8 8b4dd4 8b90c0000000 89511c } // n = 5, score = 300 // 648920 | mov dword ptr fs:[eax], esp // 8b45f8 | mov eax, dword ptr [ebp - 8] // 8b4dd4 | mov ecx, dword ptr [ebp - 0x2c] // 8b90c0000000 | mov edx, dword ptr [eax + 0xc0] // 89511c | mov dword ptr [ecx + 0x1c], edx $sequence_9 = { 89c3 89d6 89f8 e8???????? 39d6 7c06 7f0a } // n = 7, score = 300 // 89c3 | mov ebx, eax // 89d6 | mov esi, edx // 89f8 | mov eax, edi // e8???????? | // 39d6 | cmp esi, edx // 7c06 | jl 8 // 7f0a | jg 0xc condition: 7 of them and filesize < 739328 }
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