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rule win_carberp_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" version = "1" description = "Detects win.carberp." 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.carberp" malpedia_rule_date = "20220405" malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a" malpedia_version = "20220411" 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 = { e8???????? 8b7df4 6a05 57 8945f8 e8???????? 57 } // n = 7, score = 200 // e8???????? | // 8b7df4 | mov edi, dword ptr [ebp - 0xc] // 6a05 | push 5 // 57 | push edi // 8945f8 | mov dword ptr [ebp - 8], eax // e8???????? | // 57 | push edi $sequence_1 = { 68???????? 50 e8???????? 68???????? 893d???????? e8???????? 83c418 } // n = 7, score = 200 // 68???????? | // 50 | push eax // e8???????? | // 68???????? | // 893d???????? | // e8???????? | // 83c418 | add esp, 0x18 $sequence_2 = { b8???????? 3bf7 7505 b8???????? 50 e8???????? 59 } // n = 7, score = 200 // b8???????? | // 3bf7 | cmp esi, edi // 7505 | jne 7 // b8???????? | // 50 | push eax // e8???????? | // 59 | pop ecx $sequence_3 = { 55 8bec 83e4f8 51 803d????????00 53 56 } // n = 7, score = 200 // 55 | push ebp // 8bec | mov ebp, esp // 83e4f8 | and esp, 0xfffffff8 // 51 | push ecx // 803d????????00 | // 53 | push ebx // 56 | push esi $sequence_4 = { 8bf0 8d862e010000 50 e8???????? 687a5c3f6a 6a0d 8d7e0c } // n = 7, score = 200 // 8bf0 | mov esi, eax // 8d862e010000 | lea eax, dword ptr [esi + 0x12e] // 50 | push eax // e8???????? | // 687a5c3f6a | push 0x6a3f5c7a // 6a0d | push 0xd // 8d7e0c | lea edi, dword ptr [esi + 0xc] $sequence_5 = { ff75f4 c6002f 40 50 e8???????? 83c418 5f } // n = 7, score = 200 // ff75f4 | push dword ptr [ebp - 0xc] // c6002f | mov byte ptr [eax], 0x2f // 40 | inc eax // 50 | push eax // e8???????? | // 83c418 | add esp, 0x18 // 5f | pop edi $sequence_6 = { 59 32c9 eb15 3c0a 7504 04f7 eb06 } // n = 7, score = 200 // 59 | pop ecx // 32c9 | xor cl, cl // eb15 | jmp 0x17 // 3c0a | cmp al, 0xa // 7504 | jne 6 // 04f7 | add al, 0xf7 // eb06 | jmp 8 $sequence_7 = { e8???????? 53 e8???????? 83c414 6a00 bb???????? 53 } // n = 7, score = 200 // e8???????? | // 53 | push ebx // e8???????? | // 83c414 | add esp, 0x14 // 6a00 | push 0 // bb???????? | // 53 | push ebx $sequence_8 = { 8d4801 3b4d0c 897d10 7d65 83ff10 7d3b 8a1431 } // n = 7, score = 200 // 8d4801 | lea ecx, dword ptr [eax + 1] // 3b4d0c | cmp ecx, dword ptr [ebp + 0xc] // 897d10 | mov dword ptr [ebp + 0x10], edi // 7d65 | jge 0x67 // 83ff10 | cmp edi, 0x10 // 7d3b | jge 0x3d // 8a1431 | mov dl, byte ptr [ecx + esi] $sequence_9 = { ff760c 894604 56 57 e8???????? 83c418 85c0 } // n = 7, score = 200 // ff760c | push dword ptr [esi + 0xc] // 894604 | mov dword ptr [esi + 4], eax // 56 | push esi // 57 | push edi // e8???????? | // 83c418 | add esp, 0x18 // 85c0 | test eax, eax condition: 7 of them and filesize < 491520 }
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