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rule win_ragnarlocker_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" version = "1" description = "Detects win.ragnarlocker." 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.ragnarlocker" malpedia_rule_date = "20220513" malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26" malpedia_version = "20220516" 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 = { 8b5584 8bf1 0facd113 c1e60d 0bd9 c1ea13 0bf2 } // n = 7, score = 300 // 8b5584 | mov edx, dword ptr [ebp - 0x7c] // 8bf1 | mov esi, ecx // 0facd113 | shrd ecx, edx, 0x13 // c1e60d | shl esi, 0xd // 0bd9 | or ebx, ecx // c1ea13 | shr edx, 0x13 // 0bf2 | or esi, edx $sequence_1 = { 0bd8 8b45e8 8bf0 0facc812 c1e60e c1e912 } // n = 6, score = 300 // 0bd8 | or ebx, eax // 8b45e8 | mov eax, dword ptr [ebp - 0x18] // 8bf0 | mov esi, eax // 0facc812 | shrd eax, ecx, 0x12 // c1e60e | shl esi, 0xe // c1e912 | shr ecx, 0x12 $sequence_2 = { 8b5598 f7d6 23b518ffffff f7d2 239514ffffff 8b8d1cffffff 33d0 } // n = 7, score = 300 // 8b5598 | mov edx, dword ptr [ebp - 0x68] // f7d6 | not esi // 23b518ffffff | and esi, dword ptr [ebp - 0xe8] // f7d2 | not edx // 239514ffffff | and edx, dword ptr [ebp - 0xec] // 8b8d1cffffff | mov ecx, dword ptr [ebp - 0xe4] // 33d0 | xor edx, eax $sequence_3 = { 3375d8 3355dc 8b4de4 8b45d0 } // n = 4, score = 300 // 3375d8 | xor esi, dword ptr [ebp - 0x28] // 3355dc | xor edx, dword ptr [ebp - 0x24] // 8b4de4 | mov ecx, dword ptr [ebp - 0x1c] // 8b45d0 | mov eax, dword ptr [ebp - 0x30] $sequence_4 = { 33f1 2355cc 8b4dd8 33fa } // n = 4, score = 300 // 33f1 | xor esi, ecx // 2355cc | and edx, dword ptr [ebp - 0x34] // 8b4dd8 | mov ecx, dword ptr [ebp - 0x28] // 33fa | xor edi, edx $sequence_5 = { 0bf0 3155ec 3175d8 33d2 8b4df4 8bf1 8b45e8 } // n = 7, score = 300 // 0bf0 | or esi, eax // 3155ec | xor dword ptr [ebp - 0x14], edx // 3175d8 | xor dword ptr [ebp - 0x28], esi // 33d2 | xor edx, edx // 8b4df4 | mov ecx, dword ptr [ebp - 0xc] // 8bf1 | mov esi, ecx // 8b45e8 | mov eax, dword ptr [ebp - 0x18] $sequence_6 = { c1ea12 3175fc 0bfa 8b4de8 33df 8b55f4 8bf9 } // n = 7, score = 300 // c1ea12 | shr edx, 0x12 // 3175fc | xor dword ptr [ebp - 4], esi // 0bfa | or edi, edx // 8b4de8 | mov ecx, dword ptr [ebp - 0x18] // 33df | xor ebx, edi // 8b55f4 | mov edx, dword ptr [ebp - 0xc] // 8bf9 | mov edi, ecx $sequence_7 = { 895db0 33db c1e60d c1ea13 0bf2 0bd9 8b9554ffffff } // n = 7, score = 300 // 895db0 | mov dword ptr [ebp - 0x50], ebx // 33db | xor ebx, ebx // c1e60d | shl esi, 0xd // c1ea13 | shr edx, 0x13 // 0bf2 | or esi, edx // 0bd9 | or ebx, ecx // 8b9554ffffff | mov edx, dword ptr [ebp - 0xac] $sequence_8 = { 0f8277ffffff eb0c 56 ff15???????? } // n = 4, score = 300 // 0f8277ffffff | jb 0xffffff7d // eb0c | jmp 0xe // 56 | push esi // ff15???????? | $sequence_9 = { c1e108 0bc8 0fb64604 c1e108 0bc8 894b14 0f114318 } // n = 7, score = 300 // c1e108 | shl ecx, 8 // 0bc8 | or ecx, eax // 0fb64604 | movzx eax, byte ptr [esi + 4] // c1e108 | shl ecx, 8 // 0bc8 | or ecx, eax // 894b14 | mov dword ptr [ebx + 0x14], ecx // 0f114318 | movups xmmword ptr [ebx + 0x18], xmm0 condition: 7 of them and filesize < 147456 }
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