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rule win_ransoc_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.ransoc." 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.ransoc" 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 = { 56 8bf8 e8???????? 83c410 83ffff } // n = 5, score = 300 // 56 | push esi // 8bf8 | mov edi, eax // e8???????? | // 83c410 | add esp, 0x10 // 83ffff | cmp edi, -1 $sequence_1 = { 6a00 6817c00000 6a00 6a00 } // n = 4, score = 300 // 6a00 | push 0 // 6817c00000 | push 0xc017 // 6a00 | push 0 // 6a00 | push 0 $sequence_2 = { 838eb400000002 85c0 740c 8d9688000000 52 ffd0 } // n = 6, score = 300 // 838eb400000002 | or dword ptr [esi + 0xb4], 2 // 85c0 | test eax, eax // 740c | je 0xe // 8d9688000000 | lea edx, [esi + 0x88] // 52 | push edx // ffd0 | call eax $sequence_3 = { 7403 897a44 8b513c 897144 8b7238 89713c 3bf7 } // n = 7, score = 300 // 7403 | je 5 // 897a44 | mov dword ptr [edx + 0x44], edi // 8b513c | mov edx, dword ptr [ecx + 0x3c] // 897144 | mov dword ptr [ecx + 0x44], esi // 8b7238 | mov esi, dword ptr [edx + 0x38] // 89713c | mov dword ptr [ecx + 0x3c], esi // 3bf7 | cmp esi, edi $sequence_4 = { 8bc7 e8???????? 8bc7 6a10 } // n = 4, score = 300 // 8bc7 | mov eax, edi // e8???????? | // 8bc7 | mov eax, edi // 6a10 | push 0x10 $sequence_5 = { c7402c20000000 c7400801000000 56 8d5010 8d7108 8932 } // n = 6, score = 300 // c7402c20000000 | mov dword ptr [eax + 0x2c], 0x20 // c7400801000000 | mov dword ptr [eax + 8], 1 // 56 | push esi // 8d5010 | lea edx, [eax + 0x10] // 8d7108 | lea esi, [ecx + 8] // 8932 | mov dword ptr [edx], esi $sequence_6 = { 25fffeffff 014e40 89462c 7518 } // n = 4, score = 300 // 25fffeffff | and eax, 0xfffffeff // 014e40 | add dword ptr [esi + 0x40], ecx // 89462c | mov dword ptr [esi + 0x2c], eax // 7518 | jne 0x1a $sequence_7 = { 8b442438 8b4c2420 8b542424 8908 8b4c2428 5e } // n = 6, score = 300 // 8b442438 | mov eax, dword ptr [esp + 0x38] // 8b4c2420 | mov ecx, dword ptr [esp + 0x20] // 8b542424 | mov edx, dword ptr [esp + 0x24] // 8908 | mov dword ptr [eax], ecx // 8b4c2428 | mov ecx, dword ptr [esp + 0x28] // 5e | pop esi $sequence_8 = { 895140 8b4830 85c9 7406 8b5034 895134 } // n = 6, score = 300 // 895140 | mov dword ptr [ecx + 0x40], edx // 8b4830 | mov ecx, dword ptr [eax + 0x30] // 85c9 | test ecx, ecx // 7406 | je 8 // 8b5034 | mov edx, dword ptr [eax + 0x34] // 895134 | mov dword ptr [ecx + 0x34], edx $sequence_9 = { 83c618 56 e8???????? 83c40c 5e c3 } // n = 6, score = 300 // 83c618 | add esi, 0x18 // 56 | push esi // e8???????? | // 83c40c | add esp, 0xc // 5e | pop esi // c3 | ret condition: 7 of them and filesize < 958464 }
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