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rule win_sombrat_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.sombrat." 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.sombrat" 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 = { 85c0 0f85da000000 448bc7 488d4dc8 498bd4 e8???????? 8bd8 } // n = 7, score = 200 // 85c0 | dec eax // 0f85da000000 | test ecx, ecx // 448bc7 | je 0x78c // 488d4dc8 | dec eax // 498bd4 | cmp dword ptr [ecx], 0 // e8???????? | // 8bd8 | je 0x78c $sequence_1 = { 74ed 488bd0 498b03 4d8b4b10 80781900 7519 4180791900 } // n = 7, score = 200 // 74ed | dec eax // 488bd0 | mov dword ptr [esi + 0x18], 0xf // 498b03 | dec ecx // 4d8b4b10 | mov eax, esi // 80781900 | mov byte ptr [esi], 0 // 7519 | ja 0x16bd // 4180791900 | cmp dword ptr [ecx + 0xc], 0x17 $sequence_2 = { 488d1401 e8???????? 488b83e0000000 41b9bb120000 4889442430 4d8bc6 } // n = 6, score = 200 // 488d1401 | dec eax // e8???????? | // 488b83e0000000 | add ecx, esi // 41b9bb120000 | dec ecx // 4889442430 | mov edx, esi // 4d8bc6 | dec eax $sequence_3 = { b8809fffff ebde 488b01 4533c0 4885c0 7476 83780402 } // n = 7, score = 200 // b8809fffff | mov ecx, 0x8f4 // ebde | dec esp // 488b01 | cmp dword ptr [edi + 0xe0], edx // 4533c0 | jne 0xb27 // 4885c0 | cmp dword ptr [edi + 0x18], 3 // 7476 | inc ecx // 83780402 | mov ecx, 0x14d1 $sequence_4 = { 7510 8b420c 39410c 7508 8b4210 394110 7f28 } // n = 7, score = 200 // 7510 | dec ecx // 8b420c | mov ebp, dword ptr [ebx + 0x38] // 39410c | setne dl // 7508 | inc ecx // 8b4210 | call dword ptr [eax + 0x20] // 394110 | dec ebp // 7f28 | mov dword ptr [edi + 0x38], ebp $sequence_5 = { 740c 4585ff 7507 85c0 7403 448bf3 85d2 } // n = 7, score = 200 // 740c | test esi, esi // 4585ff | je 0x1175 // 7507 | dec eax // 85c0 | test edi, edi // 7403 | je 0x1175 // 448bf3 | dec esp // 85d2 | mov eax, edi $sequence_6 = { 4183e901 7421 4183e901 7416 4183e901 740b 4183f901 } // n = 7, score = 200 // 4183e901 | dec eax // 7421 | mov dword ptr [ecx], eax // 4183e901 | dec eax // 7416 | lea ebx, [edi + 0x18] // 4183e901 | dec eax // 740b | lea eax, [0x74fc3] // 4183f901 | dec eax $sequence_7 = { e9???????? 8acb 4584f6 741b 0fb6c1 ba0f000000 482bd0 } // n = 7, score = 200 // e9???????? | // 8acb | inc ebp // 4584f6 | mov byte ptr [ecx - 1], al // 741b | dec ecx // 0fb6c1 | mov ecx, eax // ba0f000000 | dec eax // 482bd0 | shr ecx, 8 $sequence_8 = { 80bfe028000000 7512 488b0b 4885c9 740a 488b01 ba01000000 } // n = 7, score = 200 // 80bfe028000000 | mov eax, ebx // 7512 | dec eax // 488b0b | mov ecx, dword ptr [esp + 0x90] // 4885c9 | dec eax // 740a | xor ecx, esp // 488b01 | xor edx, edx // ba01000000 | inc esp $sequence_9 = { bf01000000 448bc7 488b5508 488bcd e8???????? 488bf0 4885c0 } // n = 7, score = 200 // bf01000000 | dec ecx // 448bc7 | mov dword ptr [eax + 0x10], eax // 488b5508 | dec eax // 488bcd | mov eax, dword ptr [ecx] // e8???????? | // 488bf0 | cmp byte ptr [eax + 0x19], 0 // 4885c0 | jne 0xb01 condition: 7 of them and filesize < 1466368 }
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