There is no description at this point.
rule win_ragnarlocker_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 = { c1e604 0bd0 c1e91c 0bf1 8b45c4 8b4dfc } // n = 6, score = 300 // c1e604 | shl esi, 4 // 0bd0 | or edx, eax // c1e91c | shr ecx, 0x1c // 0bf1 | or esi, ecx // 8b45c4 | mov eax, dword ptr [ebp - 0x3c] // 8b4dfc | mov ecx, dword ptr [ebp - 4] $sequence_1 = { eb0c 56 ff15???????? eb1d } // n = 4, score = 300 // eb0c | jmp 0xe // 56 | push esi // ff15???????? | // eb1d | jmp 0x1f $sequence_2 = { 2355ec 234dd8 2345dc 33f1 33d0 8b45b8 03c6 } // n = 7, score = 300 // 2355ec | and edx, dword ptr [ebp - 0x14] // 234dd8 | and ecx, dword ptr [ebp - 0x28] // 2345dc | and eax, dword ptr [ebp - 0x24] // 33f1 | xor esi, ecx // 33d0 | xor edx, eax // 8b45b8 | mov eax, dword ptr [ebp - 0x48] // 03c6 | add eax, esi $sequence_3 = { c1e104 8bd7 894dc8 8bce 0facd11c 33f6 c1ef02 } // n = 7, score = 300 // c1e104 | shl ecx, 4 // 8bd7 | mov edx, edi // 894dc8 | mov dword ptr [ebp - 0x38], ecx // 8bce | mov ecx, esi // 0facd11c | shrd ecx, edx, 0x1c // 33f6 | xor esi, esi // c1ef02 | shr edi, 2 $sequence_4 = { c1e108 0bc8 0fb64704 c1e108 0bc8 894b08 } // n = 6, score = 300 // c1e108 | shl ecx, 8 // 0bc8 | or ecx, eax // 0fb64704 | movzx eax, byte ptr [edi + 4] // c1e108 | shl ecx, 8 // 0bc8 | or ecx, eax // 894b08 | mov dword ptr [ebx + 8], ecx $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 = { 99 8bd8 8bf2 0fb64169 0fa4de08 99 c1e308 } // n = 7, score = 300 // 99 | cdq // 8bd8 | mov ebx, eax // 8bf2 | mov esi, edx // 0fb64169 | movzx eax, byte ptr [ecx + 0x69] // 0fa4de08 | shld esi, ebx, 8 // 99 | cdq // c1e308 | shl ebx, 8 $sequence_7 = { 0fb6416d 0fa4de08 99 c1e308 0bf2 0bd8 } // n = 6, score = 300 // 0fb6416d | movzx eax, byte ptr [ecx + 0x6d] // 0fa4de08 | shld esi, ebx, 8 // 99 | cdq // c1e308 | shl ebx, 8 // 0bf2 | or esi, edx // 0bd8 | or ebx, eax $sequence_8 = { 33d2 8b4dc8 8bf1 8b45f4 0fa4c119 c1ee07 c1e019 } // n = 7, score = 300 // 33d2 | xor edx, edx // 8b4dc8 | mov ecx, dword ptr [ebp - 0x38] // 8bf1 | mov esi, ecx // 8b45f4 | mov eax, dword ptr [ebp - 0xc] // 0fa4c119 | shld ecx, eax, 0x19 // c1ee07 | shr esi, 7 // c1e019 | shl eax, 0x19 $sequence_9 = { 0bd8 8b45a0 0bf9 8b4dc0 33d2 8bf0 0facc812 } // n = 7, score = 300 // 0bd8 | or ebx, eax // 8b45a0 | mov eax, dword ptr [ebp - 0x60] // 0bf9 | or edi, ecx // 8b4dc0 | mov ecx, dword ptr [ebp - 0x40] // 33d2 | xor edx, edx // 8bf0 | mov esi, eax // 0facc812 | shrd eax, ecx, 0x12 condition: 7 of them and filesize < 147456 }
If your designated proposal does not fit in any other category, feel free to write a free-text in the comment field below.
Please propose all changes regarding references on the Malpedia library page
Your suggestion will be reviewed before being published. Thank you for contributing!
YYYY-MM-DD
YYYY-MM
YYYY