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rule win_dma_locker_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.dma_locker." 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.dma_locker" 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 = { e8???????? 8bf0 eb02 33f6 6803010000 8d8c24a1040000 } // n = 6, score = 200 // e8???????? | // 8bf0 | mov esi, eax // eb02 | jmp 4 // 33f6 | xor esi, esi // 6803010000 | push 0x103 // 8d8c24a1040000 | lea ecx, [esp + 0x4a1] $sequence_1 = { 57 56 e8???????? 83c40c 84db } // n = 5, score = 200 // 57 | push edi // 56 | push esi // e8???????? | // 83c40c | add esp, 0xc // 84db | test bl, bl $sequence_2 = { 8bc7 e8???????? 84c0 741f 8b4f10 8b13 57 } // n = 7, score = 200 // 8bc7 | mov eax, edi // e8???????? | // 84c0 | test al, al // 741f | je 0x21 // 8b4f10 | mov ecx, dword ptr [edi + 0x10] // 8b13 | mov edx, dword ptr [ebx] // 57 | push edi $sequence_3 = { 8a5dfd 32ca 8a55fc 32cb 8848ff 8aca } // n = 6, score = 200 // 8a5dfd | mov bl, byte ptr [ebp - 3] // 32ca | xor cl, dl // 8a55fc | mov dl, byte ptr [ebp - 4] // 32cb | xor cl, bl // 8848ff | mov byte ptr [eax - 1], cl // 8aca | mov cl, dl $sequence_4 = { 8b5e04 8b0e 8945ec 8b55ec } // n = 4, score = 200 // 8b5e04 | mov ebx, dword ptr [esi + 4] // 8b0e | mov ecx, dword ptr [esi] // 8945ec | mov dword ptr [ebp - 0x14], eax // 8b55ec | mov edx, dword ptr [ebp - 0x14] $sequence_5 = { ffd7 85c0 7fe3 5f } // n = 4, score = 200 // ffd7 | call edi // 85c0 | test eax, eax // 7fe3 | jg 0xffffffe5 // 5f | pop edi $sequence_6 = { e8???????? 8b442420 8b00 83c40c 8d4c2424 51 } // n = 6, score = 200 // e8???????? | // 8b442420 | mov eax, dword ptr [esp + 0x20] // 8b00 | mov eax, dword ptr [eax] // 83c40c | add esp, 0xc // 8d4c2424 | lea ecx, [esp + 0x24] // 51 | push ecx $sequence_7 = { 52 ff15???????? a1???????? 6a00 50 ff15???????? e9???????? } // n = 7, score = 200 // 52 | push edx // ff15???????? | // a1???????? | // 6a00 | push 0 // 50 | push eax // ff15???????? | // e9???????? | $sequence_8 = { 7545 68???????? e8???????? 8b95b0f6ffff 83c404 52 ff15???????? } // n = 7, score = 200 // 7545 | jne 0x47 // 68???????? | // e8???????? | // 8b95b0f6ffff | mov edx, dword ptr [ebp - 0x950] // 83c404 | add esp, 4 // 52 | push edx // ff15???????? | $sequence_9 = { 385e14 0f85e8000000 8b4618 83f8ff 7407 50 ff15???????? } // n = 7, score = 200 // 385e14 | cmp byte ptr [esi + 0x14], bl // 0f85e8000000 | jne 0xee // 8b4618 | mov eax, dword ptr [esi + 0x18] // 83f8ff | cmp eax, -1 // 7407 | je 9 // 50 | push eax // ff15???????? | condition: 7 of them and filesize < 532480 }
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