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rule win_divergent_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.divergent." 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.divergent" malpedia_rule_date = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { 8d85e1feffff 50 c745ec37616978 c745f032546861 } // n = 4, score = 300 // 8d85e1feffff | lea eax, [ebp - 0x11f] // 50 | push eax // c745ec37616978 | mov dword ptr [ebp - 0x14], 0x78696137 // c745f032546861 | mov dword ptr [ebp - 0x10], 0x61685432 $sequence_1 = { e8???????? eb2d 83f86e 7422 83f874 7415 83f87b } // n = 7, score = 300 // e8???????? | // eb2d | jmp 0x2f // 83f86e | cmp eax, 0x6e // 7422 | je 0x24 // 83f874 | cmp eax, 0x74 // 7415 | je 0x17 // 83f87b | cmp eax, 0x7b $sequence_2 = { c645fc00 c60000 40 49 75f9 8d85e4feffff 50 } // n = 7, score = 300 // c645fc00 | mov byte ptr [ebp - 4], 0 // c60000 | mov byte ptr [eax], 0 // 40 | inc eax // 49 | dec ecx // 75f9 | jne 0xfffffffb // 8d85e4feffff | lea eax, [ebp - 0x11c] // 50 | push eax $sequence_3 = { 66ab 8d45bc 50 e8???????? 33c0 c6458c00 8d7d8d } // n = 7, score = 300 // 66ab | stosw word ptr es:[edi], ax // 8d45bc | lea eax, [ebp - 0x44] // 50 | push eax // e8???????? | // 33c0 | xor eax, eax // c6458c00 | mov byte ptr [ebp - 0x74], 0 // 8d7d8d | lea edi, [ebp - 0x73] $sequence_4 = { 85f6 7405 8b4df0 890e 8bc7 } // n = 5, score = 300 // 85f6 | test esi, esi // 7405 | je 7 // 8b4df0 | mov ecx, dword ptr [ebp - 0x10] // 890e | mov dword ptr [esi], ecx // 8bc7 | mov eax, edi $sequence_5 = { e8???????? 59 59 85c0 0f48c3 e9???????? 68???????? } // n = 7, score = 300 // e8???????? | // 59 | pop ecx // 59 | pop ecx // 85c0 | test eax, eax // 0f48c3 | cmovs eax, ebx // e9???????? | // 68???????? | $sequence_6 = { ff15???????? 837df402 7509 c745ec01000000 eb35 837df403 } // n = 6, score = 300 // ff15???????? | // 837df402 | cmp dword ptr [ebp - 0xc], 2 // 7509 | jne 0xb // c745ec01000000 | mov dword ptr [ebp - 0x14], 1 // eb35 | jmp 0x37 // 837df403 | cmp dword ptr [ebp - 0xc], 3 $sequence_7 = { e8???????? e8???????? 8945f8 83c408 8bc2 } // n = 5, score = 300 // e8???????? | // e8???????? | // 8945f8 | mov dword ptr [ebp - 8], eax // 83c408 | add esp, 8 // 8bc2 | mov eax, edx $sequence_8 = { 50 e8???????? 59 6a03 56 e8???????? 59 } // n = 7, score = 300 // 50 | push eax // e8???????? | // 59 | pop ecx // 6a03 | push 3 // 56 | push esi // e8???????? | // 59 | pop ecx $sequence_9 = { 8bf8 83c414 85ff 742c 8b463c ff743054 56 } // n = 7, score = 300 // 8bf8 | mov edi, eax // 83c414 | add esp, 0x14 // 85ff | test edi, edi // 742c | je 0x2e // 8b463c | mov eax, dword ptr [esi + 0x3c] // ff743054 | push dword ptr [eax + esi + 0x54] // 56 | push esi condition: 7 of them and filesize < 212992 }
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