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rule win_bernhardpos_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" 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 = "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 = { c745f801000000 eb02 ebc1 837df800 0f8496000000 8b45fc } // n = 6, score = 200 // c745f801000000 | mov dword ptr [ebp - 8], 1 // eb02 | jmp 4 // ebc1 | jmp 0xffffffc3 // 837df800 | cmp dword ptr [ebp - 8], 0 // 0f8496000000 | je 0x9c // 8b45fc | mov eax, dword ptr [ebp - 4] $sequence_1 = { 50 e8???????? 83c40c 8d8570feffff 50 ff15???????? } // n = 6, score = 200 // 50 | push eax // e8???????? | // 83c40c | add esp, 0xc // 8d8570feffff | lea eax, [ebp - 0x190] // 50 | push eax // ff15???????? | $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 = { 8b4508 0345fc 0fbe08 83f944 } // n = 4, score = 200 // 8b4508 | mov eax, dword ptr [ebp + 8] // 0345fc | add eax, dword ptr [ebp - 4] // 0fbe08 | movsx ecx, byte ptr [eax] // 83f944 | cmp ecx, 0x44 $sequence_4 = { 6bc800 81c1???????? 898d58feffff 6a65 ff15???????? 8b8d58feffff 668901 } // n = 7, score = 200 // 6bc800 | imul ecx, eax, 0 // 81c1???????? | // 898d58feffff | mov dword ptr [ebp - 0x1a8], ecx // 6a65 | push 0x65 // ff15???????? | // 8b8d58feffff | mov ecx, dword ptr [ebp - 0x1a8] // 668901 | mov word ptr [ecx], ax $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 = { 83c408 b801000000 6bc800 81c1???????? } // n = 4, score = 200 // 83c408 | add esp, 8 // b801000000 | mov eax, 1 // 6bc800 | imul ecx, eax, 0 // 81c1???????? | $sequence_7 = { 8b8508feffff 5f 5e 5b 8be5 } // n = 5, score = 200 // 8b8508feffff | mov eax, dword ptr [ebp - 0x1f8] // 5f | pop edi // 5e | pop esi // 5b | pop ebx // 8be5 | mov esp, ebp $sequence_8 = { 8b8df0fbffff 51 8b55f4 52 ff15???????? 8d85ecfbffff } // n = 6, score = 200 // 8b8df0fbffff | mov ecx, dword ptr [ebp - 0x410] // 51 | push ecx // 8b55f4 | mov edx, dword ptr [ebp - 0xc] // 52 | push edx // ff15???????? | // 8d85ecfbffff | lea eax, [ebp - 0x414] $sequence_9 = { 53 56 57 a1???????? 8945e8 } // n = 5, score = 200 // 53 | push ebx // 56 | push esi // 57 | push edi // a1???????? | // 8945e8 | mov dword ptr [ebp - 0x18], eax condition: 7 of them and filesize < 368640 }
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