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rule win_saint_bot_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.saint_bot." 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.saint_bot" 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 = { e8???????? 68???????? 8945e4 e8???????? 53 8945e0 } // n = 6, score = 100 // e8???????? | // 68???????? | // 8945e4 | mov dword ptr [ebp - 0x1c], eax // e8???????? | // 53 | push ebx // 8945e0 | mov dword ptr [ebp - 0x20], eax $sequence_1 = { a3???????? 56 ffd7 ff75dc } // n = 4, score = 100 // a3???????? | // 56 | push esi // ffd7 | call edi // ff75dc | push dword ptr [ebp - 0x24] $sequence_2 = { 57 ff75f0 53 50 68e9fd0000 ff15???????? } // n = 6, score = 100 // 57 | push edi // ff75f0 | push dword ptr [ebp - 0x10] // 53 | push ebx // 50 | push eax // 68e9fd0000 | push 0xfde9 // ff15???????? | $sequence_3 = { a3???????? 56 ffd7 a3???????? 8b35???????? } // n = 5, score = 100 // a3???????? | // 56 | push esi // ffd7 | call edi // a3???????? | // 8b35???????? | $sequence_4 = { 761d 03d2 6a02 52 } // n = 4, score = 100 // 761d | jbe 0x1f // 03d2 | add edx, edx // 6a02 | push 2 // 52 | push edx $sequence_5 = { 57 e8???????? ff75f4 68e8030000 57 e8???????? 57 } // n = 7, score = 100 // 57 | push edi // e8???????? | // ff75f4 | push dword ptr [ebp - 0xc] // 68e8030000 | push 0x3e8 // 57 | push edi // e8???????? | // 57 | push edi $sequence_6 = { ff15???????? 8b45fc 47 3bf8 7ec4 8b7dec 85db } // n = 7, score = 100 // ff15???????? | // 8b45fc | mov eax, dword ptr [ebp - 4] // 47 | inc edi // 3bf8 | cmp edi, eax // 7ec4 | jle 0xffffffc6 // 8b7dec | mov edi, dword ptr [ebp - 0x14] // 85db | test ebx, ebx $sequence_7 = { e8???????? 68???????? 8945dc e8???????? ff75dc 8bd8 } // n = 6, score = 100 // e8???????? | // 68???????? | // 8945dc | mov dword ptr [ebp - 0x24], eax // e8???????? | // ff75dc | push dword ptr [ebp - 0x24] // 8bd8 | mov ebx, eax $sequence_8 = { ff75d8 a3???????? 53 ffd7 ff75dc a3???????? 53 } // n = 7, score = 100 // ff75d8 | push dword ptr [ebp - 0x28] // a3???????? | // 53 | push ebx // ffd7 | call edi // ff75dc | push dword ptr [ebp - 0x24] // a3???????? | // 53 | push ebx $sequence_9 = { ffd7 ff75ec a3???????? 53 ffd7 a3???????? 8b45fc } // n = 7, score = 100 // ffd7 | call edi // ff75ec | push dword ptr [ebp - 0x14] // a3???????? | // 53 | push ebx // ffd7 | call edi // a3???????? | // 8b45fc | mov eax, dword ptr [ebp - 4] condition: 7 of them and filesize < 93184 }
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