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rule win_doubleback_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.doubleback." 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.doubleback" malpedia_rule_date = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 = { eb34 2d63450000 7428 2d57020000 } // n = 4, score = 400 // eb34 | cmp dword ptr [ecx], 0 // 2d63450000 | je 0x45c // 7428 | push 0x8000 // 2d57020000 | mov dword ptr [ebp - 4], eax $sequence_1 = { b90b070000 eb34 2d63450000 7428 2d57020000 } // n = 5, score = 400 // b90b070000 | mov word ptr [esi + edi*2 + 0x618], ax // eb34 | push 0x24 // 2d63450000 | pop eax // 7428 | push 0x70 // 2d57020000 | pop ecx $sequence_2 = { 751a b9d4070000 eb13 b975070000 eb0c b96f070000 } // n = 6, score = 400 // 751a | je 0x37a // b9d4070000 | dec eax // eb13 | mov eax, dword ptr [esi + 0x48] // b975070000 | dec eax // eb0c | test eax, eax // b96f070000 | inc ecx $sequence_3 = { 3bc2 774f 7446 3d00280000 } // n = 4, score = 400 // 3bc2 | mov esi, eax // 774f | xor edx, edx // 7446 | xor edx, edx // 3d00280000 | inc ecx $sequence_4 = { b947060000 eb49 b9e7050000 eb42 } // n = 4, score = 400 // b947060000 | dec esp // eb49 | lea eax, [edx + eax] // b9e7050000 | dec esp // eb42 | mov edx, edx $sequence_5 = { eb0c b96f070000 eb05 b911070000 } // n = 4, score = 400 // eb0c | push eax // b96f070000 | push dword ptr [ebp - 8] // eb05 | mov dword ptr [ebp - 0xc], 0x104 // b911070000 | mov dword ptr [ebp - 0x10], eax $sequence_6 = { b9ad060000 eb57 b9a7060000 eb50 b947060000 } // n = 5, score = 400 // b9ad060000 | mov edx, dword ptr [edi] // eb57 | lea ecx, [ebp - 0x10] // b9a7060000 | pop ecx // eb50 | test eax, eax // b947060000 | jne 0x4e0 $sequence_7 = { 740e 3dab3f0000 755e b9ad060000 } // n = 4, score = 400 // 740e | mov dword ptr [ebp - 0x50], esp // 3dab3f0000 | dec eax // 755e | mov ebx, dword ptr [ebp - 0x50] // b9ad060000 | dec eax $sequence_8 = { b947060000 eb49 b9e7050000 eb42 b9e3050000 eb3b b90b070000 } // n = 7, score = 400 // b947060000 | xor ecx, ecx // eb49 | dec eax // b9e7050000 | add ecx, dword ptr [ebx] // eb42 | inc ebp // b9e3050000 | mov eax, dword ptr [esi] // eb3b | inc ebp // b90b070000 | mov ecx, dword ptr [esi] $sequence_9 = { b9d4070000 eb13 b975070000 eb0c b96f070000 } // n = 5, score = 400 // b9d4070000 | jne 0x4f4 // eb13 | add edi, 0x929 // b975070000 | dec ebx // eb0c | pop ecx // b96f070000 | test esi, esi condition: 7 of them and filesize < 106496 }
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