Actor(s): Naikon
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rule win_sslmm_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.sslmm." 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.sslmm" 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 = { 6a00 6a01 6a0a ff15???????? } // n = 4, score = 400 // 6a00 | push 0 // 6a01 | push 1 // 6a0a | push 0xa // ff15???????? | $sequence_1 = { 8bf1 6805100000 c7442414c0d40100 e8???????? } // n = 4, score = 400 // 8bf1 | mov esi, ecx // 6805100000 | push 0x1005 // c7442414c0d40100 | mov dword ptr [esp + 0x14], 0x1d4c0 // e8???????? | $sequence_2 = { 8d44240c 68???????? 50 e8???????? 83c40c 85c0 7419 } // n = 7, score = 400 // 8d44240c | lea eax, [esp + 0xc] // 68???????? | // 50 | push eax // e8???????? | // 83c40c | add esp, 0xc // 85c0 | test eax, eax // 7419 | je 0x1b $sequence_3 = { 3bc6 0f85a0010000 8b54243c 8b442438 8b6c2434 } // n = 5, score = 400 // 3bc6 | cmp eax, esi // 0f85a0010000 | jne 0x1a6 // 8b54243c | mov edx, dword ptr [esp + 0x3c] // 8b442438 | mov eax, dword ptr [esp + 0x38] // 8b6c2434 | mov ebp, dword ptr [esp + 0x34] $sequence_4 = { 8b442410 51 52 50 ffd7 5f } // n = 6, score = 400 // 8b442410 | mov eax, dword ptr [esp + 0x10] // 51 | push ecx // 52 | push edx // 50 | push eax // ffd7 | call edi // 5f | pop edi $sequence_5 = { 49 85c9 7e3a 8d41ff 85c0 7c33 803c105c } // n = 7, score = 400 // 49 | dec ecx // 85c9 | test ecx, ecx // 7e3a | jle 0x3c // 8d41ff | lea eax, [ecx - 1] // 85c0 | test eax, eax // 7c33 | jl 0x35 // 803c105c | cmp byte ptr [eax + edx], 0x5c $sequence_6 = { 3bfb 7c4e 8b442428 3bc3 } // n = 4, score = 400 // 3bfb | cmp edi, ebx // 7c4e | jl 0x50 // 8b442428 | mov eax, dword ptr [esp + 0x28] // 3bc3 | cmp eax, ebx $sequence_7 = { c20800 ff15???????? 8bf8 57 } // n = 4, score = 400 // c20800 | ret 8 // ff15???????? | // 8bf8 | mov edi, eax // 57 | push edi $sequence_8 = { 85c9 c70204000000 7410 c786a800000001000000 8986ac000000 } // n = 5, score = 400 // 85c9 | test ecx, ecx // c70204000000 | mov dword ptr [edx], 4 // 7410 | je 0x12 // c786a800000001000000 | mov dword ptr [esi + 0xa8], 1 // 8986ac000000 | mov dword ptr [esi + 0xac], eax $sequence_9 = { e8???????? 8b542414 8bcf 89442428 8bf8 8bc1 } // n = 6, score = 400 // e8???????? | // 8b542414 | mov edx, dword ptr [esp + 0x14] // 8bcf | mov ecx, edi // 89442428 | mov dword ptr [esp + 0x28], eax // 8bf8 | mov edi, eax // 8bc1 | mov eax, ecx condition: 7 of them and filesize < 188416 }
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