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rule win_bredolab_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.bredolab." 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.bredolab" 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 = { 8b4518 89442410 8b4514 8944240c c744240800000000 } // n = 5, score = 200 // 8b4518 | mov eax, dword ptr [ebp + 0x18] // 89442410 | mov dword ptr [esp + 0x10], eax // 8b4514 | mov eax, dword ptr [ebp + 0x14] // 8944240c | mov dword ptr [esp + 0xc], eax // c744240800000000 | mov dword ptr [esp + 8], 0 $sequence_1 = { baffe8a435 89d1 31d2 f7f1 81c200e1f505 89542408 c7442404???????? } // n = 7, score = 200 // baffe8a435 | mov edx, 0x35a4e8ff // 89d1 | mov ecx, edx // 31d2 | xor edx, edx // f7f1 | div ecx // 81c200e1f505 | add edx, 0x5f5e100 // 89542408 | mov dword ptr [esp + 8], edx // c7442404???????? | $sequence_2 = { 0f85e8000000 ba???????? 90 31c0 6690 8a8800500010 300c02 } // n = 7, score = 200 // 0f85e8000000 | jne 0xee // ba???????? | // 90 | nop // 31c0 | xor eax, eax // 6690 | nop // 8a8800500010 | mov cl, byte ptr [eax + 0x10005000] // 300c02 | xor byte ptr [edx + eax], cl $sequence_3 = { 57 56 53 b86c140000 } // n = 4, score = 200 // 57 | push edi // 56 | push esi // 53 | push ebx // b86c140000 | mov eax, 0x146c $sequence_4 = { f2ae f7d1 8d41ff 81c40c090000 } // n = 4, score = 200 // f2ae | repne scasb al, byte ptr es:[edi] // f7d1 | not ecx // 8d41ff | lea eax, [ecx - 1] // 81c40c090000 | add esp, 0x90c $sequence_5 = { 8b8318120000 85c0 0f8e88000000 c783381200000c000000 } // n = 4, score = 200 // 8b8318120000 | mov eax, dword ptr [ebx + 0x1218] // 85c0 | test eax, eax // 0f8e88000000 | jle 0x8e // c783381200000c000000 | mov dword ptr [ebx + 0x1238], 0xc $sequence_6 = { 0f85c5000000 8b9560feffff 8b02 3b45dc 7437 } // n = 5, score = 200 // 0f85c5000000 | jne 0xcb // 8b9560feffff | mov edx, dword ptr [ebp - 0x1a0] // 8b02 | mov eax, dword ptr [edx] // 3b45dc | cmp eax, dword ptr [ebp - 0x24] // 7437 | je 0x39 $sequence_7 = { 5e 5f c9 c3 8db526ffffff b910000000 } // n = 6, score = 200 // 5e | pop esi // 5f | pop edi // c9 | leave // c3 | ret // 8db526ffffff | lea esi, [ebp - 0xda] // b910000000 | mov ecx, 0x10 $sequence_8 = { 8b8a1c120000 85c9 0f8ee7000000 31ff 31c0 8d9d20f7ffff 89b514f7ffff } // n = 7, score = 200 // 8b8a1c120000 | mov ecx, dword ptr [edx + 0x121c] // 85c9 | test ecx, ecx // 0f8ee7000000 | jle 0xed // 31ff | xor edi, edi // 31c0 | xor eax, eax // 8d9d20f7ffff | lea ebx, [ebp - 0x8e0] // 89b514f7ffff | mov dword ptr [ebp - 0x8ec], esi $sequence_9 = { 85c0 753b 0fb78394010000 338396010000 0d00000080 baffe8a435 89d1 } // n = 7, score = 200 // 85c0 | test eax, eax // 753b | jne 0x3d // 0fb78394010000 | movzx eax, word ptr [ebx + 0x194] // 338396010000 | xor eax, dword ptr [ebx + 0x196] // 0d00000080 | or eax, 0x80000000 // baffe8a435 | mov edx, 0x35a4e8ff // 89d1 | mov ecx, edx condition: 7 of them and filesize < 90112 }
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