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rule win_kronos_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" version = "1" description = "Detects win.kronos." 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.kronos" 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 = { 85f6 742f 8d45fc 50 ff75fc 56 6a1b } // n = 7, score = 2800 // 85f6 | test esi, esi // 742f | je 0x31 // 8d45fc | lea eax, dword ptr [ebp - 4] // 50 | push eax // ff75fc | push dword ptr [ebp - 4] // 56 | push esi // 6a1b | push 0x1b $sequence_1 = { 8d0cb9 8b7c85c8 897c8b1c 8b7dfc } // n = 4, score = 2800 // 8d0cb9 | lea ecx, dword ptr [ecx + edi*4] // 8b7c85c8 | mov edi, dword ptr [ebp + eax*4 - 0x38] // 897c8b1c | mov dword ptr [ebx + ecx*4 + 0x1c], edi // 8b7dfc | mov edi, dword ptr [ebp - 4] $sequence_2 = { ff15???????? 8b4d18 8901 33c9 3bc3 } // n = 5, score = 2800 // ff15???????? | // 8b4d18 | mov ecx, dword ptr [ebp + 0x18] // 8901 | mov dword ptr [ecx], eax // 33c9 | xor ecx, ecx // 3bc3 | cmp eax, ebx $sequence_3 = { 7610 8b4df0 83b9c01b000000 0f853b010000 8b4dd8 8b55ec 49 } // n = 7, score = 2800 // 7610 | jbe 0x12 // 8b4df0 | mov ecx, dword ptr [ebp - 0x10] // 83b9c01b000000 | cmp dword ptr [ecx + 0x1bc0], 0 // 0f853b010000 | jne 0x141 // 8b4dd8 | mov ecx, dword ptr [ebp - 0x28] // 8b55ec | mov edx, dword ptr [ebp - 0x14] // 49 | dec ecx $sequence_4 = { 33f6 8d4dec e8???????? 8d4ddc e8???????? 8bc6 5e } // n = 7, score = 2800 // 33f6 | xor esi, esi // 8d4dec | lea ecx, dword ptr [ebp - 0x14] // e8???????? | // 8d4ddc | lea ecx, dword ptr [ebp - 0x24] // e8???????? | // 8bc6 | mov eax, esi // 5e | pop esi $sequence_5 = { 8a11 84d2 740c 80fa5c 7407 80fa2f 7402 } // n = 7, score = 2800 // 8a11 | mov dl, byte ptr [ecx] // 84d2 | test dl, dl // 740c | je 0xe // 80fa5c | cmp dl, 0x5c // 7407 | je 9 // 80fa2f | cmp dl, 0x2f // 7402 | je 4 $sequence_6 = { 8bec 83e4f8 81ec08010000 56 57 6a01 } // n = 6, score = 2800 // 8bec | mov ebp, esp // 83e4f8 | and esp, 0xfffffff8 // 81ec08010000 | sub esp, 0x108 // 56 | push esi // 57 | push edi // 6a01 | push 1 $sequence_7 = { 8d4e08 e8???????? 56 e8???????? ff4f0c 83c404 8bf3 } // n = 7, score = 2800 // 8d4e08 | lea ecx, dword ptr [esi + 8] // e8???????? | // 56 | push esi // e8???????? | // ff4f0c | dec dword ptr [edi + 0xc] // 83c404 | add esp, 4 // 8bf3 | mov esi, ebx $sequence_8 = { ff15???????? 3bc3 7512 ff15???????? 33c9 } // n = 5, score = 2800 // ff15???????? | // 3bc3 | cmp eax, ebx // 7512 | jne 0x14 // ff15???????? | // 33c9 | xor ecx, ecx $sequence_9 = { e8???????? 8d8d40feffff e8???????? 8b750c 83fe20 7312 } // n = 6, score = 2800 // e8???????? | // 8d8d40feffff | lea ecx, dword ptr [ebp - 0x1c0] // e8???????? | // 8b750c | mov esi, dword ptr [ebp + 0xc] // 83fe20 | cmp esi, 0x20 // 7312 | jae 0x14 condition: 7 of them and filesize < 1302528 }
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