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rule win_ransomlock_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.ransomlock." 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.ransomlock" 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 = { 50 e8???????? 83c408 8b0d???????? 6a64 51 ff15???????? } // n = 7, score = 100 // 50 | push eax // e8???????? | // 83c408 | add esp, 8 // 8b0d???????? | // 6a64 | push 0x64 // 51 | push ecx // ff15???????? | $sequence_1 = { 99 2bc2 6a00 8bd1 d1ea d1f8 } // n = 6, score = 100 // 99 | cdq // 2bc2 | sub eax, edx // 6a00 | push 0 // 8bd1 | mov edx, ecx // d1ea | shr edx, 1 // d1f8 | sar eax, 1 $sequence_2 = { 8b5120 56 50 ffd2 85c0 7807 c745ec01000000 } // n = 7, score = 100 // 8b5120 | mov edx, dword ptr [ecx + 0x20] // 56 | push esi // 50 | push eax // ffd2 | call edx // 85c0 | test eax, eax // 7807 | js 9 // c745ec01000000 | mov dword ptr [ebp - 0x14], 1 $sequence_3 = { 0f8418010000 8b08 8d55fc 52 50 8b4120 } // n = 6, score = 100 // 0f8418010000 | je 0x11e // 8b08 | mov ecx, dword ptr [eax] // 8d55fc | lea edx, [ebp - 4] // 52 | push edx // 50 | push eax // 8b4120 | mov eax, dword ptr [ecx + 0x20] $sequence_4 = { 0fb7047521664000 4e 6685c0 75ec 57 68???????? ffd3 } // n = 7, score = 100 // 0fb7047521664000 | movzx eax, word ptr [esi*2 + 0x406621] // 4e | dec esi // 6685c0 | test ax, ax // 75ec | jne 0xffffffee // 57 | push edi // 68???????? | // ffd3 | call ebx $sequence_5 = { 50 ff15???????? 83c410 6a01 53 } // n = 5, score = 100 // 50 | push eax // ff15???????? | // 83c410 | add esp, 0x10 // 6a01 | push 1 // 53 | push ebx $sequence_6 = { 57 ff15???????? 8d70ff 0fb70477 6685c0 7413 8bff } // n = 7, score = 100 // 57 | push edi // ff15???????? | // 8d70ff | lea esi, [eax - 1] // 0fb70477 | movzx eax, word ptr [edi + esi*2] // 6685c0 | test ax, ax // 7413 | je 0x15 // 8bff | mov edi, edi $sequence_7 = { 90 68???????? 33f6 ff15???????? a1???????? 85c0 7429 } // n = 7, score = 100 // 90 | nop // 68???????? | // 33f6 | xor esi, esi // ff15???????? | // a1???????? | // 85c0 | test eax, eax // 7429 | je 0x2b $sequence_8 = { 8b45f0 3bc6 0f8418010000 8b08 8d55fc 52 50 } // n = 7, score = 100 // 8b45f0 | mov eax, dword ptr [ebp - 0x10] // 3bc6 | cmp eax, esi // 0f8418010000 | je 0x11e // 8b08 | mov ecx, dword ptr [eax] // 8d55fc | lea edx, [ebp - 4] // 52 | push edx // 50 | push eax $sequence_9 = { 52 8d8574fdffff 68???????? 50 ff15???????? 83c410 6a01 } // n = 7, score = 100 // 52 | push edx // 8d8574fdffff | lea eax, [ebp - 0x28c] // 68???????? | // 50 | push eax // ff15???????? | // 83c410 | add esp, 0x10 // 6a01 | push 1 condition: 7 of them and filesize < 360448 }
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