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rule win_bamital_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.bamital." 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.bamital" malpedia_rule_date = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = { eb05 83c001 ebe0 52 ff75fc e8???????? } // n = 6, score = 300 // eb05 | jmp 7 // 83c001 | add eax, 1 // ebe0 | jmp 0xffffffe2 // 52 | push edx // ff75fc | push dword ptr [ebp - 4] // e8???????? | $sequence_1 = { 8ac4 8807 83c701 e2d8 c9 c20800 55 } // n = 7, score = 300 // 8ac4 | mov al, ah // 8807 | mov byte ptr [edi], al // 83c701 | add edi, 1 // e2d8 | loop 0xffffffda // c9 | leave // c20800 | ret 8 // 55 | push ebp $sequence_2 = { ff75dc ff75d4 57 e8???????? 8b55fc 8945fc 0bd2 } // n = 7, score = 300 // ff75dc | push dword ptr [ebp - 0x24] // ff75d4 | push dword ptr [ebp - 0x2c] // 57 | push edi // e8???????? | // 8b55fc | mov edx, dword ptr [ebp - 4] // 8945fc | mov dword ptr [ebp - 4], eax // 0bd2 | or edx, edx $sequence_3 = { e8???????? 8b55fc 8945fc 0bd2 } // n = 4, score = 300 // e8???????? | // 8b55fc | mov edx, dword ptr [ebp - 4] // 8945fc | mov dword ptr [ebp - 4], eax // 0bd2 | or edx, edx $sequence_4 = { 0bc0 741f 50 83c001 50 } // n = 5, score = 300 // 0bc0 | or eax, eax // 741f | je 0x21 // 50 | push eax // 83c001 | add eax, 1 // 50 | push eax $sequence_5 = { b800000000 c9 c20400 55 8bec 83c4f0 } // n = 6, score = 300 // b800000000 | mov eax, 0 // c9 | leave // c20400 | ret 4 // 55 | push ebp // 8bec | mov ebp, esp // 83c4f0 | add esp, -0x10 $sequence_6 = { 56 57 53 8b5d0c 8b7508 } // n = 5, score = 300 // 56 | push esi // 57 | push edi // 53 | push ebx // 8b5d0c | mov ebx, dword ptr [ebp + 0xc] // 8b7508 | mov esi, dword ptr [ebp + 8] $sequence_7 = { ff7508 ff75f4 e8???????? 68e8070000 } // n = 4, score = 300 // ff7508 | push dword ptr [ebp + 8] // ff75f4 | push dword ptr [ebp - 0xc] // e8???????? | // 68e8070000 | push 0x7e8 $sequence_8 = { 6a28 e8???????? 8945fc ff7508 e8???????? 8945f8 e8???????? } // n = 7, score = 300 // 6a28 | push 0x28 // e8???????? | // 8945fc | mov dword ptr [ebp - 4], eax // ff7508 | push dword ptr [ebp + 8] // e8???????? | // 8945f8 | mov dword ptr [ebp - 8], eax // e8???????? | $sequence_9 = { 8a07 3c39 7208 3c7e 7704 2c19 eb13 } // n = 7, score = 300 // 8a07 | mov al, byte ptr [edi] // 3c39 | cmp al, 0x39 // 7208 | jb 0xa // 3c7e | cmp al, 0x7e // 7704 | ja 6 // 2c19 | sub al, 0x19 // eb13 | jmp 0x15 condition: 7 of them and filesize < 90112 }
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