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rule win_dimnie_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" version = "1" description = "Detects win.dimnie." 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.dimnie" malpedia_rule_date = "20220405" malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a" malpedia_version = "20220411" 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 = { 8b4508 0fb64801 81e1f0000000 c1f904 } // n = 4, score = 400 // 8b4508 | mov eax, dword ptr [ebp + 8] // 0fb64801 | movzx ecx, byte ptr [eax + 1] // 81e1f0000000 | and ecx, 0xf0 // c1f904 | sar ecx, 4 $sequence_1 = { 83e203 c1e204 8b4508 0fb64801 81e1f0000000 } // n = 5, score = 400 // 83e203 | and edx, 3 // c1e204 | shl edx, 4 // 8b4508 | mov eax, dword ptr [ebp + 8] // 0fb64801 | movzx ecx, byte ptr [eax + 1] // 81e1f0000000 | and ecx, 0xf0 $sequence_2 = { 0fb611 83e203 c1e204 8b4508 0fb64801 81e1f0000000 } // n = 6, score = 400 // 0fb611 | movzx edx, byte ptr [ecx] // 83e203 | and edx, 3 // c1e204 | shl edx, 4 // 8b4508 | mov eax, dword ptr [ebp + 8] // 0fb64801 | movzx ecx, byte ptr [eax + 1] // 81e1f0000000 | and ecx, 0xf0 $sequence_3 = { 8945f4 8b4df8 83c101 8b45f4 33d2 f7f1 } // n = 6, score = 400 // 8945f4 | mov dword ptr [ebp - 0xc], eax // 8b4df8 | mov ecx, dword ptr [ebp - 8] // 83c101 | add ecx, 1 // 8b45f4 | mov eax, dword ptr [ebp - 0xc] // 33d2 | xor edx, edx // f7f1 | div ecx $sequence_4 = { 8b5508 0fb64201 83e00f c1e002 8b4d08 } // n = 5, score = 400 // 8b5508 | mov edx, dword ptr [ebp + 8] // 0fb64201 | movzx eax, byte ptr [edx + 1] // 83e00f | and eax, 0xf // c1e002 | shl eax, 2 // 8b4d08 | mov ecx, dword ptr [ebp + 8] $sequence_5 = { 7605 8b450c eb54 8b550c 2b5508 83fa01 751c } // n = 7, score = 400 // 7605 | jbe 7 // 8b450c | mov eax, dword ptr [ebp + 0xc] // eb54 | jmp 0x56 // 8b550c | mov edx, dword ptr [ebp + 0xc] // 2b5508 | sub edx, dword ptr [ebp + 8] // 83fa01 | cmp edx, 1 // 751c | jne 0x1e $sequence_6 = { 7504 33c0 eb6e 8b4508 3b450c } // n = 5, score = 400 // 7504 | jne 6 // 33c0 | xor eax, eax // eb6e | jmp 0x70 // 8b4508 | mov eax, dword ptr [ebp + 8] // 3b450c | cmp eax, dword ptr [ebp + 0xc] $sequence_7 = { 7505 8b4508 eb61 8b4d08 } // n = 4, score = 400 // 7505 | jne 7 // 8b4508 | mov eax, dword ptr [ebp + 8] // eb61 | jmp 0x63 // 8b4d08 | mov ecx, dword ptr [ebp + 8] $sequence_8 = { c1e204 8b4508 0fb64801 81e1f0000000 c1f904 0bd1 } // n = 6, score = 400 // c1e204 | shl edx, 4 // 8b4508 | mov eax, dword ptr [ebp + 8] // 0fb64801 | movzx ecx, byte ptr [eax + 1] // 81e1f0000000 | and ecx, 0xf0 // c1f904 | sar ecx, 4 // 0bd1 | or edx, ecx $sequence_9 = { eb2d 8b550c 2b5508 8955f8 0f31 } // n = 5, score = 400 // eb2d | jmp 0x2f // 8b550c | mov edx, dword ptr [ebp + 0xc] // 2b5508 | sub edx, dword ptr [ebp + 8] // 8955f8 | mov dword ptr [ebp - 8], edx // 0f31 | rdtsc condition: 7 of them and filesize < 212992 }
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