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rule win_dimnie_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "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 = { eb04 c645af3d 8b4d0c 8a55af 885102 837d1002 } // n = 6, score = 400 // eb04 | jmp 6 // c645af3d | mov byte ptr [ebp - 0x51], 0x3d // 8b4d0c | mov ecx, dword ptr [ebp + 0xc] // 8a55af | mov dl, byte ptr [ebp - 0x51] // 885102 | mov byte ptr [ecx + 2], dl // 837d1002 | cmp dword ptr [ebp + 0x10], 2 $sequence_1 = { 7e13 8b4508 0fb64802 83e13f } // n = 4, score = 400 // 7e13 | jle 0x15 // 8b4508 | mov eax, dword ptr [ebp + 8] // 0fb64802 | movzx ecx, byte ptr [eax + 2] // 83e13f | and ecx, 0x3f $sequence_2 = { 8b4508 8b08 83e10f 8b5508 890a 8b450c } // n = 6, score = 400 // 8b4508 | mov eax, dword ptr [ebp + 8] // 8b08 | mov ecx, dword ptr [eax] // 83e10f | and ecx, 0xf // 8b5508 | mov edx, dword ptr [ebp + 8] // 890a | mov dword ptr [edx], ecx // 8b450c | mov eax, dword ptr [ebp + 0xc] $sequence_3 = { 8a55af 885102 837d1002 7e13 8b4508 0fb64802 } // n = 6, score = 400 // 8a55af | mov dl, byte ptr [ebp - 0x51] // 885102 | mov byte ptr [ecx + 2], dl // 837d1002 | cmp dword ptr [ebp + 0x10], 2 // 7e13 | jle 0x15 // 8b4508 | mov eax, dword ptr [ebp + 8] // 0fb64802 | movzx ecx, byte ptr [eax + 2] $sequence_4 = { 83c101 8b45f4 33d2 f7f1 } // n = 4, score = 400 // 83c101 | add ecx, 1 // 8b45f4 | mov eax, dword ptr [ebp - 0xc] // 33d2 | xor edx, edx // f7f1 | div ecx $sequence_5 = { 8b4d08 0fb611 83e203 c1e204 8b4508 } // n = 5, score = 400 // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 0fb611 | movzx edx, byte ptr [ecx] // 83e203 | and edx, 3 // c1e204 | shl edx, 4 // 8b4508 | mov eax, dword ptr [ebp + 8] $sequence_6 = { 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_7 = { eb6e 8b4508 3b450c 7505 } // n = 4, score = 400 // eb6e | jmp 0x70 // 8b4508 | mov eax, dword ptr [ebp + 8] // 3b450c | cmp eax, dword ptr [ebp + 0xc] // 7505 | jne 7 $sequence_8 = { a4 8b4508 0fb608 c1f902 8b550c } // n = 5, score = 400 // a4 | movsb byte ptr es:[edi], byte ptr [esi] // 8b4508 | mov eax, dword ptr [ebp + 8] // 0fb608 | movzx ecx, byte ptr [eax] // c1f902 | sar ecx, 2 // 8b550c | mov edx, dword ptr [ebp + 0xc] $sequence_9 = { 8b4d0c c70101000000 8b5510 c70201000000 8b4508 8b08 83e10f } // n = 7, score = 400 // 8b4d0c | mov ecx, dword ptr [ebp + 0xc] // c70101000000 | mov dword ptr [ecx], 1 // 8b5510 | mov edx, dword ptr [ebp + 0x10] // c70201000000 | mov dword ptr [edx], 1 // 8b4508 | mov eax, dword ptr [ebp + 8] // 8b08 | mov ecx, dword ptr [eax] // 83e10f | and ecx, 0xf condition: 7 of them and filesize < 212992 }
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