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rule win_sanny_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" 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 = "20220405" malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a" malpedia_version = "20220411" 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 = { 0f8635020000 8bb42470030000 81c390000000 8d942468020000 } // n = 4, score = 100 // 0f8635020000 | jbe 0x23b // 8bb42470030000 | mov esi, dword ptr [esp + 0x370] // 81c390000000 | add ebx, 0x90 // 8d942468020000 | lea edx, dword ptr [esp + 0x268] $sequence_1 = { 8bc6 8bce c1f805 83e11f 8b0485c0864100 } // n = 5, score = 100 // 8bc6 | mov eax, esi // 8bce | mov ecx, esi // c1f805 | sar eax, 5 // 83e11f | and ecx, 0x1f // 8b0485c0864100 | mov eax, dword ptr [eax*4 + 0x4186c0] $sequence_2 = { 52 50 6801000080 e8???????? 85c0 740b 8b8624c70000 } // n = 7, score = 100 // 52 | push edx // 50 | push eax // 6801000080 | push 0x80000001 // e8???????? | // 85c0 | test eax, eax // 740b | je 0xd // 8b8624c70000 | mov eax, dword ptr [esi + 0xc724] $sequence_3 = { 8bc3 8bcb c1f805 83e11f 8b0485c0864100 8d04c8 eb05 } // n = 7, score = 100 // 8bc3 | mov eax, ebx // 8bcb | mov ecx, ebx // c1f805 | sar eax, 5 // 83e11f | and ecx, 0x1f // 8b0485c0864100 | mov eax, dword ptr [eax*4 + 0x4186c0] // 8d04c8 | lea eax, dword ptr [eax + ecx*8] // eb05 | jmp 7 $sequence_4 = { 33c8 8bc6 c1f81a 83e03f 8b3c85d4594100 8bc6 c1f812 } // n = 7, score = 100 // 33c8 | xor ecx, eax // 8bc6 | mov eax, esi // c1f81a | sar eax, 0x1a // 83e03f | and eax, 0x3f // 8b3c85d4594100 | mov edi, dword ptr [eax*4 + 0x4159d4] // 8bc6 | mov eax, esi // c1f812 | sar eax, 0x12 $sequence_5 = { 03d0 c784d56021000000000000 ff8558200000 b941000000 33c0 8dbc2454020000 f3ab } // n = 7, score = 100 // 03d0 | add edx, eax // c784d56021000000000000 | mov dword ptr [ebp + edx*8 + 0x2160], 0 // ff8558200000 | inc dword ptr [ebp + 0x2058] // b941000000 | mov ecx, 0x41 // 33c0 | xor eax, eax // 8dbc2454020000 | lea edi, dword ptr [esp + 0x254] // f3ab | rep stosd dword ptr es:[edi], eax $sequence_6 = { 8b6c2450 c1c107 03cd 8beb 03ce 33ee } // n = 6, score = 100 // 8b6c2450 | mov ebp, dword ptr [esp + 0x50] // c1c107 | rol ecx, 7 // 03cd | add ecx, ebp // 8beb | mov ebp, ebx // 03ce | add ecx, esi // 33ee | xor ebp, esi $sequence_7 = { 3bfb 741c 57 e8???????? 56 8d0c00 6a01 } // n = 7, score = 100 // 3bfb | cmp edi, ebx // 741c | je 0x1e // 57 | push edi // e8???????? | // 56 | push esi // 8d0c00 | lea ecx, dword ptr [eax + eax] // 6a01 | push 1 $sequence_8 = { 2bc1 03c2 894508 8bc6 c1f805 83e61f 8d1c85c0864100 } // n = 7, score = 100 // 2bc1 | sub eax, ecx // 03c2 | add eax, edx // 894508 | mov dword ptr [ebp + 8], eax // 8bc6 | mov eax, esi // c1f805 | sar eax, 5 // 83e61f | and esi, 0x1f // 8d1c85c0864100 | lea ebx, dword ptr [eax*4 + 0x4186c0] $sequence_9 = { 8b542408 53 55 56 8b02 57 8bc8 } // n = 7, score = 100 // 8b542408 | mov edx, dword ptr [esp + 8] // 53 | push ebx // 55 | push ebp // 56 | push esi // 8b02 | mov eax, dword ptr [edx] // 57 | push edi // 8bc8 | mov ecx, eax condition: 7 of them and filesize < 253952 }
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