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rule win_scanpos_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.scanpos." 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.scanpos" 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 = { c745b406000000 eb29 3c34 7509 } // n = 4, score = 200 // c745b406000000 | mov dword ptr [ebp - 0x4c], 6 // eb29 | jmp 0x2b // 3c34 | cmp al, 0x34 // 7509 | jne 0xb $sequence_1 = { 7229 f3a5 ff2495d0624000 8bc7 ba03000000 83e904 } // n = 6, score = 200 // 7229 | jb 0x2b // f3a5 | rep movsd dword ptr es:[edi], dword ptr [esi] // ff2495d0624000 | jmp dword ptr [edx*4 + 0x4062d0] // 8bc7 | mov eax, edi // ba03000000 | mov edx, 3 // 83e904 | sub ecx, 4 $sequence_2 = { 50 c745f4cc114100 e8???????? cc 8bff 55 8bec } // n = 7, score = 200 // 50 | push eax // c745f4cc114100 | mov dword ptr [ebp - 0xc], 0x4111cc // e8???????? | // cc | int3 // 8bff | mov edi, edi // 55 | push ebp // 8bec | mov ebp, esp $sequence_3 = { eb17 80fa0a 0f8ec5000000 80383f 8bd8 7503 } // n = 6, score = 200 // eb17 | jmp 0x19 // 80fa0a | cmp dl, 0xa // 0f8ec5000000 | jle 0xcb // 80383f | cmp byte ptr [eax], 0x3f // 8bd8 | mov ebx, eax // 7503 | jne 5 $sequence_4 = { 3b45e0 7508 3bd3 0f8486000000 c745e804000000 8b16 8b4204 } // n = 7, score = 200 // 3b45e0 | cmp eax, dword ptr [ebp - 0x20] // 7508 | jne 0xa // 3bd3 | cmp edx, ebx // 0f8486000000 | je 0x8c // c745e804000000 | mov dword ptr [ebp - 0x18], 4 // 8b16 | mov edx, dword ptr [esi] // 8b4204 | mov eax, dword ptr [edx + 4] $sequence_5 = { 8b443024 8b5710 33db 895de8 } // n = 4, score = 200 // 8b443024 | mov eax, dword ptr [eax + esi + 0x24] // 8b5710 | mov edx, dword ptr [edi + 0x10] // 33db | xor ebx, ebx // 895de8 | mov dword ptr [ebp - 0x18], ebx $sequence_6 = { 8d4dd4 51 8bde e8???????? c745fc00000000 } // n = 5, score = 200 // 8d4dd4 | lea ecx, [ebp - 0x2c] // 51 | push ecx // 8bde | mov ebx, esi // e8???????? | // c745fc00000000 | mov dword ptr [ebp - 4], 0 $sequence_7 = { e8???????? 8d8de8feffff c645fc04 e8???????? 8d4d80 e8???????? 8b4df4 } // n = 7, score = 200 // e8???????? | // 8d8de8feffff | lea ecx, [ebp - 0x118] // c645fc04 | mov byte ptr [ebp - 4], 4 // e8???????? | // 8d4d80 | lea ecx, [ebp - 0x80] // e8???????? | // 8b4df4 | mov ecx, dword ptr [ebp - 0xc] $sequence_8 = { 893a a1???????? 8938 8325????????fe 83bde0feffff10 8b85ccfeffff 7306 } // n = 7, score = 200 // 893a | mov dword ptr [edx], edi // a1???????? | // 8938 | mov dword ptr [eax], edi // 8325????????fe | // 83bde0feffff10 | cmp dword ptr [ebp - 0x120], 0x10 // 8b85ccfeffff | mov eax, dword ptr [ebp - 0x134] // 7306 | jae 8 $sequence_9 = { 53 e8???????? 83c404 03b59cfeffff 8b95c0feffff } // n = 5, score = 200 // 53 | push ebx // e8???????? | // 83c404 | add esp, 4 // 03b59cfeffff | add esi, dword ptr [ebp - 0x164] // 8b95c0feffff | mov edx, dword ptr [ebp - 0x140] condition: 7 of them and filesize < 229376 }
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