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rule win_sage_ransom_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.sage_ransom." 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.sage_ransom" malpedia_rule_date = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = { 57 56 68???????? e8???????? 83c408 6a00 6a00 } // n = 7, score = 300 // 57 | push edi // 56 | push esi // 68???????? | // e8???????? | // 83c408 | add esp, 8 // 6a00 | push 0 // 6a00 | push 0 $sequence_1 = { 8b74246c 57 c7442408adde9e5a b908000000 8d7c240c f3a5 8b742478 } // n = 7, score = 300 // 8b74246c | mov esi, dword ptr [esp + 0x6c] // 57 | push edi // c7442408adde9e5a | mov dword ptr [esp + 8], 0x5a9edead // b908000000 | mov ecx, 8 // 8d7c240c | lea edi, [esp + 0xc] // f3a5 | rep movsd dword ptr es:[edi], dword ptr [esi] // 8b742478 | mov esi, dword ptr [esp + 0x78] $sequence_2 = { 6a02 ff15???????? 8bf0 8d471c } // n = 4, score = 300 // 6a02 | push 2 // ff15???????? | // 8bf0 | mov esi, eax // 8d471c | lea eax, [edi + 0x1c] $sequence_3 = { 55 56 894c243c ff15???????? 83f8ff 7541 56 } // n = 7, score = 300 // 55 | push ebp // 56 | push esi // 894c243c | mov dword ptr [esp + 0x3c], ecx // ff15???????? | // 83f8ff | cmp eax, -1 // 7541 | jne 0x43 // 56 | push esi $sequence_4 = { 56 57 6af5 ff15???????? 8b15???????? 83c204 52 } // n = 7, score = 300 // 56 | push esi // 57 | push edi // 6af5 | push -0xb // ff15???????? | // 8b15???????? | // 83c204 | add edx, 4 // 52 | push edx $sequence_5 = { 68e0930400 ffd6 6a02 e8???????? 83c404 68c0270900 } // n = 6, score = 300 // 68e0930400 | push 0x493e0 // ffd6 | call esi // 6a02 | push 2 // e8???????? | // 83c404 | add esp, 4 // 68c0270900 | push 0x927c0 $sequence_6 = { 0facf014 89442420 c1ee14 8bc6 } // n = 4, score = 300 // 0facf014 | shrd eax, esi, 0x14 // 89442420 | mov dword ptr [esp + 0x20], eax // c1ee14 | shr esi, 0x14 // 8bc6 | mov eax, esi $sequence_7 = { 83c438 833d????????00 7513 e8???????? 50 } // n = 5, score = 300 // 83c438 | add esp, 0x38 // 833d????????00 | // 7513 | jne 0x15 // e8???????? | // 50 | push eax $sequence_8 = { 01410c 8b4310 014110 8b4314 } // n = 4, score = 200 // 01410c | add dword ptr [ecx + 0xc], eax // 8b4310 | mov eax, dword ptr [ebx + 0x10] // 014110 | add dword ptr [ecx + 0x10], eax // 8b4314 | mov eax, dword ptr [ebx + 0x14] $sequence_9 = { 013c13 83c102 46 ebd3 } // n = 4, score = 200 // 013c13 | add dword ptr [ebx + edx], edi // 83c102 | add ecx, 2 // 46 | inc esi // ebd3 | jmp 0xffffffd5 $sequence_10 = { 014114 8b4318 014118 8b431c } // n = 4, score = 200 // 014114 | add dword ptr [ecx + 0x14], eax // 8b4318 | mov eax, dword ptr [ebx + 0x18] // 014118 | add dword ptr [ecx + 0x18], eax // 8b431c | mov eax, dword ptr [ebx + 0x1c] $sequence_11 = { 0101 8b4304 014104 8b4308 014108 } // n = 5, score = 200 // 0101 | add dword ptr [ecx], eax // 8b4304 | mov eax, dword ptr [ebx + 4] // 014104 | add dword ptr [ecx + 4], eax // 8b4308 | mov eax, dword ptr [ebx + 8] // 014108 | add dword ptr [ecx + 8], eax $sequence_12 = { 891c24 89442404 e8???????? 31d2 3955dc 0f86df000000 } // n = 6, score = 200 // 891c24 | mov dword ptr [esp], ebx // 89442404 | mov dword ptr [esp + 4], eax // e8???????? | // 31d2 | xor edx, edx // 3955dc | cmp dword ptr [ebp - 0x24], edx // 0f86df000000 | jbe 0xe5 $sequence_13 = { 014110 8b4314 014114 8b4318 } // n = 4, score = 200 // 014110 | add dword ptr [ecx + 0x10], eax // 8b4314 | mov eax, dword ptr [ebx + 0x14] // 014114 | add dword ptr [ecx + 0x14], eax // 8b4318 | mov eax, dword ptr [ebx + 0x18] $sequence_14 = { 0119 117104 83c110 83c210 } // n = 4, score = 200 // 0119 | add dword ptr [ecx], ebx // 117104 | adc dword ptr [ecx + 4], esi // 83c110 | add ecx, 0x10 // 83c210 | add edx, 0x10 $sequence_15 = { 014108 8b430c 01410c 8b4310 } // n = 4, score = 200 // 014108 | add dword ptr [ecx + 8], eax // 8b430c | mov eax, dword ptr [ebx + 0xc] // 01410c | add dword ptr [ecx + 0xc], eax // 8b4310 | mov eax, dword ptr [ebx + 0x10] condition: 7 of them and filesize < 335872 }
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