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rule win_bernhardpos_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.bernhardpos." 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.bernhardpos" 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 = { 0f840a010000 8d85ecfbffff 50 682a020000 68???????? 8b8df0fbffff } // n = 6, score = 200 // 0f840a010000 | je 0x110 // 8d85ecfbffff | lea eax, [ebp - 0x414] // 50 | push eax // 682a020000 | push 0x22a // 68???????? | // 8b8df0fbffff | mov ecx, dword ptr [ebp - 0x410] $sequence_1 = { ff15???????? 8b8d54feffff 668901 6a10 8d855cfeffff 50 } // n = 6, score = 200 // ff15???????? | // 8b8d54feffff | mov ecx, dword ptr [ebp - 0x1ac] // 668901 | mov word ptr [ecx], ax // 6a10 | push 0x10 // 8d855cfeffff | lea eax, [ebp - 0x1a4] // 50 | push eax $sequence_2 = { 0fbe5415f8 33ca 8b4508 0345f4 8808 ebc7 5f } // n = 7, score = 200 // 0fbe5415f8 | movsx edx, byte ptr [ebp + edx - 8] // 33ca | xor ecx, edx // 8b4508 | mov eax, dword ptr [ebp + 8] // 0345f4 | add eax, dword ptr [ebp - 0xc] // 8808 | mov byte ptr [eax], cl // ebc7 | jmp 0xffffffc9 // 5f | pop edi $sequence_3 = { 8945fc 8b45fc 8b4d08 03483c 894df4 } // n = 5, score = 200 // 8945fc | mov dword ptr [ebp - 4], eax // 8b45fc | mov eax, dword ptr [ebp - 4] // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 03483c | add ecx, dword ptr [eax + 0x3c] // 894df4 | mov dword ptr [ebp - 0xc], ecx $sequence_4 = { 8808 ebc7 5f 5e 5b } // n = 5, score = 200 // 8808 | mov byte ptr [eax], cl // ebc7 | jmp 0xffffffc9 // 5f | pop edi // 5e | pop esi // 5b | pop ebx $sequence_5 = { 668b0d???????? 66894dfc 8a15???????? 8855fe 8d45f8 50 ff15???????? } // n = 7, score = 200 // 668b0d???????? | // 66894dfc | mov word ptr [ebp - 4], cx // 8a15???????? | // 8855fe | mov byte ptr [ebp - 2], dl // 8d45f8 | lea eax, [ebp - 8] // 50 | push eax // ff15???????? | $sequence_6 = { 83e863 5f 5e 5b } // n = 4, score = 200 // 83e863 | sub eax, 0x63 // 5f | pop edi // 5e | pop esi // 5b | pop ebx $sequence_7 = { 51 ff15???????? 8d85ecfeffff 50 e8???????? 83c404 85c0 } // n = 7, score = 200 // 51 | push ecx // ff15???????? | // 8d85ecfeffff | lea eax, [ebp - 0x114] // 50 | push eax // e8???????? | // 83c404 | add esp, 4 // 85c0 | test eax, eax $sequence_8 = { eb2c 33c0 eb2d 33c0 eb29 } // n = 5, score = 200 // eb2c | jmp 0x2e // 33c0 | xor eax, eax // eb2d | jmp 0x2f // 33c0 | xor eax, eax // eb29 | jmp 0x2b $sequence_9 = { e8???????? 83c404 6a01 8d85d0feffff 50 ff15???????? } // n = 6, score = 200 // e8???????? | // 83c404 | add esp, 4 // 6a01 | push 1 // 8d85d0feffff | lea eax, [ebp - 0x130] // 50 | push eax // ff15???????? | condition: 7 of them and filesize < 368640 }
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