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rule win_sanny_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.sanny." 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.sanny" 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 = { 50 53 8bce e8???????? 817df400500000 0f8e06010000 6a08 } // n = 7, score = 100 // 50 | push eax // 53 | push ebx // 8bce | mov ecx, esi // e8???????? | // 817df400500000 | cmp dword ptr [ebp - 0xc], 0x5000 // 0f8e06010000 | jle 0x10c // 6a08 | push 8 $sequence_1 = { 8b942434060000 8b842430060000 8d742410 8d5901 b987000000 } // n = 5, score = 100 // 8b942434060000 | mov edx, dword ptr [esp + 0x634] // 8b842430060000 | mov eax, dword ptr [esp + 0x630] // 8d742410 | lea esi, [esp + 0x10] // 8d5901 | lea ebx, [ecx + 1] // b987000000 | mov ecx, 0x87 $sequence_2 = { b9ff0f0000 33c0 8dbc248e0a0000 66899c248c0a0000 f3ab 55 8d8c24904a0000 } // n = 7, score = 100 // b9ff0f0000 | mov ecx, 0xfff // 33c0 | xor eax, eax // 8dbc248e0a0000 | lea edi, [esp + 0xa8e] // 66899c248c0a0000 | mov word ptr [esp + 0xa8c], bx // f3ab | rep stosd dword ptr es:[edi], eax // 55 | push ebp // 8d8c24904a0000 | lea ecx, [esp + 0x4a90] $sequence_3 = { b9ff070000 33c0 8dbc24697b0000 889c24687b0000 f3ab 66ab } // n = 6, score = 100 // b9ff070000 | mov ecx, 0x7ff // 33c0 | xor eax, eax // 8dbc24697b0000 | lea edi, [esp + 0x7b69] // 889c24687b0000 | mov byte ptr [esp + 0x7b68], bl // f3ab | rep stosd dword ptr es:[edi], eax // 66ab | stosw word ptr es:[edi], ax $sequence_4 = { ff15???????? 85c0 0f843bfeffff 8b6c242c 8b4c2410 51 } // n = 6, score = 100 // ff15???????? | // 85c0 | test eax, eax // 0f843bfeffff | je 0xfffffe41 // 8b6c242c | mov ebp, dword ptr [esp + 0x2c] // 8b4c2410 | mov ecx, dword ptr [esp + 0x10] // 51 | push ecx $sequence_5 = { 8b580c 895c2428 8d8c29db702024 8bef c1c90f 03cf 33ea } // n = 7, score = 100 // 8b580c | mov ebx, dword ptr [eax + 0xc] // 895c2428 | mov dword ptr [esp + 0x28], ebx // 8d8c29db702024 | lea ecx, [ecx + ebp + 0x242070db] // 8bef | mov ebp, edi // c1c90f | ror ecx, 0xf // 03cf | add ecx, edi // 33ea | xor ebp, edx $sequence_6 = { 50 896c2418 e8???????? 83c408 8d4c2438 57 51 } // n = 7, score = 100 // 50 | push eax // 896c2418 | mov dword ptr [esp + 0x18], ebp // e8???????? | // 83c408 | add esp, 8 // 8d4c2438 | lea ecx, [esp + 0x38] // 57 | push edi // 51 | push ecx $sequence_7 = { 83c9ff 8bfa 33c0 f2ae f7d1 49 8bfb } // n = 7, score = 100 // 83c9ff | or ecx, 0xffffffff // 8bfa | mov edi, edx // 33c0 | xor eax, eax // f2ae | repne scasb al, byte ptr es:[edi] // f7d1 | not ecx // 49 | dec ecx // 8bfb | mov edi, ebx $sequence_8 = { ffd0 85c0 0f85d6000000 8d8618c50000 8bce 50 c78610c5000001000000 } // n = 7, score = 100 // ffd0 | call eax // 85c0 | test eax, eax // 0f85d6000000 | jne 0xdc // 8d8618c50000 | lea eax, [esi + 0xc518] // 8bce | mov ecx, esi // 50 | push eax // c78610c5000001000000 | mov dword ptr [esi + 0xc510], 1 $sequence_9 = { 3bf0 7292 5d 5b 5f 33c0 5e } // n = 7, score = 100 // 3bf0 | cmp esi, eax // 7292 | jb 0xffffff94 // 5d | pop ebp // 5b | pop ebx // 5f | pop edi // 33c0 | xor eax, eax // 5e | pop esi condition: 7 of them and filesize < 253952 }
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