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rule win_biscuit_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.biscuit." 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.biscuit" 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 = { 84c0 7417 3cff 7413 85f6 7533 } // n = 6, score = 100 // 84c0 | test al, al // 7417 | je 0x19 // 3cff | cmp al, 0xff // 7413 | je 0x15 // 85f6 | test esi, esi // 7533 | jne 0x35 $sequence_1 = { 85c9 7409 83bddcbfffff00 7502 eb73 } // n = 5, score = 100 // 85c9 | test ecx, ecx // 7409 | je 0xb // 83bddcbfffff00 | cmp dword ptr [ebp - 0x4024], 0 // 7502 | jne 4 // eb73 | jmp 0x75 $sequence_2 = { 6a00 6a00 ffd5 8b4304 8b08 } // n = 5, score = 100 // 6a00 | push 0 // 6a00 | push 0 // ffd5 | call ebp // 8b4304 | mov eax, dword ptr [ebx + 4] // 8b08 | mov ecx, dword ptr [eax] $sequence_3 = { 33c0 8dbdf0dfffff f3ab 83bde8bfffff00 762a c605????????01 6a00 } // n = 7, score = 100 // 33c0 | xor eax, eax // 8dbdf0dfffff | lea edi, [ebp - 0x2010] // f3ab | rep stosd dword ptr es:[edi], eax // 83bde8bfffff00 | cmp dword ptr [ebp - 0x4018], 0 // 762a | jbe 0x2c // c605????????01 | // 6a00 | push 0 $sequence_4 = { 50 51 ff15???????? 85c0 7507 bf???????? } // n = 6, score = 100 // 50 | push eax // 51 | push ecx // ff15???????? | // 85c0 | test eax, eax // 7507 | jne 9 // bf???????? | $sequence_5 = { 8bca 50 83e103 f3a4 8d8b80000000 e8???????? e9???????? } // n = 7, score = 100 // 8bca | mov ecx, edx // 50 | push eax // 83e103 | and ecx, 3 // f3a4 | rep movsb byte ptr es:[edi], byte ptr [esi] // 8d8b80000000 | lea ecx, [ebx + 0x80] // e8???????? | // e9???????? | $sequence_6 = { 83bd18b7ffff00 0f856a050000 b980000000 33c0 8dbd40fdffff f3ab 8b4de0 } // n = 7, score = 100 // 83bd18b7ffff00 | cmp dword ptr [ebp - 0x48e8], 0 // 0f856a050000 | jne 0x570 // b980000000 | mov ecx, 0x80 // 33c0 | xor eax, eax // 8dbd40fdffff | lea edi, [ebp - 0x2c0] // f3ab | rep stosd dword ptr es:[edi], eax // 8b4de0 | mov ecx, dword ptr [ebp - 0x20] $sequence_7 = { 50 6a00 ff15???????? 85c0 894634 0f85cb000000 bf???????? } // n = 7, score = 100 // 50 | push eax // 6a00 | push 0 // ff15???????? | // 85c0 | test eax, eax // 894634 | mov dword ptr [esi + 0x34], eax // 0f85cb000000 | jne 0xd1 // bf???????? | $sequence_8 = { 8a11 80ea01 8b8528b6ffff 8810 c78530fdffff00000000 } // n = 5, score = 100 // 8a11 | mov dl, byte ptr [ecx] // 80ea01 | sub dl, 1 // 8b8528b6ffff | mov eax, dword ptr [ebp - 0x49d8] // 8810 | mov byte ptr [eax], dl // c78530fdffff00000000 | mov dword ptr [ebp - 0x2d0], 0 $sequence_9 = { f3ab 8b4c2418 51 68???????? 56 e8???????? } // n = 6, score = 100 // f3ab | rep stosd dword ptr es:[edi], eax // 8b4c2418 | mov ecx, dword ptr [esp + 0x18] // 51 | push ecx // 68???????? | // 56 | push esi // e8???????? | condition: 7 of them and filesize < 180224 }
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