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rule win_snojan_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" version = "1" description = "Detects win.snojan." 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.snojan" malpedia_rule_date = "20220513" malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26" malpedia_version = "20220516" 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 = { c3 b8???????? e8???????? 85c0 74e9 a1???????? 8b988000986d } // n = 7, score = 200 // c3 | ret // b8???????? | // e8???????? | // 85c0 | test eax, eax // 74e9 | je 0xffffffeb // a1???????? | // 8b988000986d | mov ebx, dword ptr [eax + 0x6d980080] $sequence_1 = { 83ec04 6689442422 8d442420 c744240810000000 893c24 } // n = 5, score = 200 // 83ec04 | sub esp, 4 // 6689442422 | mov word ptr [esp + 0x22], ax // 8d442420 | lea eax, [esp + 0x20] // c744240810000000 | mov dword ptr [esp + 8], 0x10 // 893c24 | mov dword ptr [esp], edi $sequence_2 = { 0f44d0 8854241f 8974240c 896c2408 c744240401000000 891c24 } // n = 6, score = 200 // 0f44d0 | cmove edx, eax // 8854241f | mov byte ptr [esp + 0x1f], dl // 8974240c | mov dword ptr [esp + 0xc], esi // 896c2408 | mov dword ptr [esp + 8], ebp // c744240401000000 | mov dword ptr [esp + 4], 1 // 891c24 | mov dword ptr [esp], ebx $sequence_3 = { c7042400000000 ff15???????? 83ec18 e8???????? } // n = 4, score = 200 // c7042400000000 | mov dword ptr [esp], 0 // ff15???????? | // 83ec18 | sub esp, 0x18 // e8???????? | $sequence_4 = { a1???????? 8d900000986d 0fb7801400986d 0fb76a06 8d5c0218 85ed } // n = 6, score = 200 // a1???????? | // 8d900000986d | lea edx, [eax + 0x6d980000] // 0fb7801400986d | movzx eax, word ptr [eax + 0x6d980014] // 0fb76a06 | movzx ebp, word ptr [edx + 6] // 8d5c0218 | lea ebx, [edx + eax + 0x18] // 85ed | test ebp, ebp $sequence_5 = { 8b4b04 85c9 0f84c3feffff e9???????? 0fb7810000986d 894dc0 } // n = 6, score = 200 // 8b4b04 | mov ecx, dword ptr [ebx + 4] // 85c9 | test ecx, ecx // 0f84c3feffff | je 0xfffffec9 // e9???????? | // 0fb7810000986d | movzx eax, word ptr [ecx + 0x6d980000] // 894dc0 | mov dword ptr [ebp - 0x40], ecx $sequence_6 = { 0f85b7000000 893c24 ff15???????? 83ec04 } // n = 4, score = 200 // 0f85b7000000 | jne 0xbd // 893c24 | mov dword ptr [esp], edi // ff15???????? | // 83ec04 | sub esp, 4 $sequence_7 = { 8b13 83c308 03960000986d 8d860000986d } // n = 4, score = 200 // 8b13 | mov edx, dword ptr [ebx] // 83c308 | add ebx, 8 // 03960000986d | add edx, dword ptr [esi + 0x6d980000] // 8d860000986d | lea eax, [esi + 0x6d980000] $sequence_8 = { 85c0 b801000000 0f44d0 8854241f 8974240c } // n = 5, score = 200 // 85c0 | test eax, eax // b801000000 | mov eax, 1 // 0f44d0 | cmove edx, eax // 8854241f | mov byte ptr [esp + 0x1f], dl // 8974240c | mov dword ptr [esp + 0xc], esi $sequence_9 = { 0f8452010000 c7442404???????? c70424???????? e8???????? 85c0 89c6 } // n = 6, score = 200 // 0f8452010000 | je 0x158 // c7442404???????? | // c70424???????? | // e8???????? | // 85c0 | test eax, eax // 89c6 | mov esi, eax condition: 7 of them and filesize < 90112 }
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