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rule win_saint_bot_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "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 = { 8bd8 85db 746d 56 ff7508 8bf7 e8???????? } // n = 7, score = 100 // 8bd8 | mov ebx, eax // 85db | test ebx, ebx // 746d | je 0x6f // 56 | push esi // ff7508 | push dword ptr [ebp + 8] // 8bf7 | mov esi, edi // e8???????? | $sequence_1 = { c3 56 57 bf04010000 57 6a00 } // n = 6, score = 100 // c3 | ret // 56 | push esi // 57 | push edi // bf04010000 | mov edi, 0x104 // 57 | push edi // 6a00 | push 0 $sequence_2 = { 6a00 897dec ffd6 8bf0 85f6 } // n = 5, score = 100 // 6a00 | push 0 // 897dec | mov dword ptr [ebp - 0x14], edi // ffd6 | call esi // 8bf0 | mov esi, eax // 85f6 | test esi, esi $sequence_3 = { ffd7 ff75f8 a3???????? 56 ffd7 ff75f0 } // n = 6, score = 100 // ffd7 | call edi // ff75f8 | push dword ptr [ebp - 8] // a3???????? | // 56 | push esi // ffd7 | call edi // ff75f0 | push dword ptr [ebp - 0x10] $sequence_4 = { 3bca 8bc2 0f42c1 50 ff75e8 56 ff15???????? } // n = 7, score = 100 // 3bca | cmp ecx, edx // 8bc2 | mov eax, edx // 0f42c1 | cmovb eax, ecx // 50 | push eax // ff75e8 | push dword ptr [ebp - 0x18] // 56 | push esi // ff15???????? | $sequence_5 = { 53 ff15???????? 6a02 53 ff15???????? 33db 53 } // n = 7, score = 100 // 53 | push ebx // ff15???????? | // 6a02 | push 2 // 53 | push ebx // ff15???????? | // 33db | xor ebx, ebx // 53 | push ebx $sequence_6 = { ffd7 ff75f4 a3???????? 53 ffd7 ff75f0 } // n = 6, score = 100 // ffd7 | call edi // ff75f4 | push dword ptr [ebp - 0xc] // a3???????? | // 53 | push ebx // ffd7 | call edi // ff75f0 | push dword ptr [ebp - 0x10] $sequence_7 = { 68e6c00200 ff15???????? e8???????? 83f841 } // n = 4, score = 100 // 68e6c00200 | push 0x2c0e6 // ff15???????? | // e8???????? | // 83f841 | cmp eax, 0x41 $sequence_8 = { ba???????? b9???????? 0f42ca 51 894dd4 e8???????? } // n = 6, score = 100 // ba???????? | // b9???????? | // 0f42ca | cmovb ecx, edx // 51 | push ecx // 894dd4 | mov dword ptr [ebp - 0x2c], ecx // e8???????? | $sequence_9 = { 68???????? e8???????? 6afa 68???????? 8bd8 e8???????? } // n = 6, score = 100 // 68???????? | // e8???????? | // 6afa | push -6 // 68???????? | // 8bd8 | mov ebx, eax // e8???????? | condition: 7 of them and filesize < 93184 }
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