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rule win_ragnarlocker_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" 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 = "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 = { 898df4feffff 894dc0 8b4f14 898decfeffff 894df8 8b4d0c 0fb601 } // n = 7, score = 300 // 898df4feffff | mov dword ptr [ebp - 0x10c], ecx // 894dc0 | mov dword ptr [ebp - 0x40], ecx // 8b4f14 | mov ecx, dword ptr [edi + 0x14] // 898decfeffff | mov dword ptr [ebp - 0x114], ecx // 894df8 | mov dword ptr [ebp - 8], ecx // 8b4d0c | mov ecx, dword ptr [ebp + 0xc] // 0fb601 | movzx eax, byte ptr [ecx] $sequence_1 = { 33f1 8b4de8 8bd0 2345d4 3355d4 2355c8 33d0 } // n = 7, score = 300 // 33f1 | xor esi, ecx // 8b4de8 | mov ecx, dword ptr [ebp - 0x18] // 8bd0 | mov edx, eax // 2345d4 | and eax, dword ptr [ebp - 0x2c] // 3355d4 | xor edx, dword ptr [ebp - 0x2c] // 2355c8 | and edx, dword ptr [ebp - 0x38] // 33d0 | xor edx, eax $sequence_2 = { 0fb6c5 6a04 0bd0 0fb6c1 6800300000 c1e208 53 } // n = 7, score = 300 // 0fb6c5 | movzx eax, ch // 6a04 | push 4 // 0bd0 | or edx, eax // 0fb6c1 | movzx eax, cl // 6800300000 | push 0x3000 // c1e208 | shl edx, 8 // 53 | push ebx $sequence_3 = { 039d28ffffff 13bd24ffffff 035d94 137d98 81c338b548f3 81d75bc25639 015df4 } // n = 7, score = 300 // 039d28ffffff | add ebx, dword ptr [ebp - 0xd8] // 13bd24ffffff | adc edi, dword ptr [ebp - 0xdc] // 035d94 | add ebx, dword ptr [ebp - 0x6c] // 137d98 | adc edi, dword ptr [ebp - 0x68] // 81c338b548f3 | add ebx, 0xf348b538 // 81d75bc25639 | adc edi, 0x3956c25b // 015df4 | add dword ptr [ebp - 0xc], ebx $sequence_4 = { 0fa4ca17 c1ee09 c1e117 0bda 8b55dc 0bf1 8b4de0 } // n = 7, score = 300 // 0fa4ca17 | shld edx, ecx, 0x17 // c1ee09 | shr esi, 9 // c1e117 | shl ecx, 0x17 // 0bda | or ebx, edx // 8b55dc | mov edx, dword ptr [ebp - 0x24] // 0bf1 | or esi, ecx // 8b4de0 | mov ecx, dword ptr [ebp - 0x20] $sequence_5 = { 8bfa 8b4dd4 8bf1 337de8 3375f4 237dac 2355e8 } // n = 7, score = 300 // 8bfa | mov edi, edx // 8b4dd4 | mov ecx, dword ptr [ebp - 0x2c] // 8bf1 | mov esi, ecx // 337de8 | xor edi, dword ptr [ebp - 0x18] // 3375f4 | xor esi, dword ptr [ebp - 0xc] // 237dac | and edi, dword ptr [ebp - 0x54] // 2355e8 | and edx, dword ptr [ebp - 0x18] $sequence_6 = { 897dfc 8bbd34ffffff 8bf7 8bcf c1e618 0facd108 } // n = 6, score = 300 // 897dfc | mov dword ptr [ebp - 4], edi // 8bbd34ffffff | mov edi, dword ptr [ebp - 0xcc] // 8bf7 | mov esi, edi // 8bcf | mov ecx, edi // c1e618 | shl esi, 0x18 // 0facd108 | shrd ecx, edx, 8 $sequence_7 = { 3375ec 8b55e8 2355c0 2375d4 33fa 8b4df4 234dec } // n = 7, score = 300 // 3375ec | xor esi, dword ptr [ebp - 0x14] // 8b55e8 | mov edx, dword ptr [ebp - 0x18] // 2355c0 | and edx, dword ptr [ebp - 0x40] // 2375d4 | and esi, dword ptr [ebp - 0x2c] // 33fa | xor edi, edx // 8b4df4 | mov ecx, dword ptr [ebp - 0xc] // 234dec | and ecx, dword ptr [ebp - 0x14] $sequence_8 = { 03c3 8945b8 13cf 33ff 894de0 } // n = 5, score = 300 // 03c3 | add eax, ebx // 8945b8 | mov dword ptr [ebp - 0x48], eax // 13cf | adc ecx, edi // 33ff | xor edi, edi // 894de0 | mov dword ptr [ebp - 0x20], ecx $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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