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rule win_carberp_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" 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 = "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 = { 5e c3 33c0 c20c00 686a008404 6a03 6a00 } // n = 7, score = 200 // 5e | pop esi // c3 | ret // 33c0 | xor eax, eax // c20c00 | ret 0xc // 686a008404 | push 0x484006a // 6a03 | push 3 // 6a00 | push 0 $sequence_1 = { 53 56 8b7508 33db 57 3bf3 0f84ff000000 } // n = 7, score = 200 // 53 | push ebx // 56 | push esi // 8b7508 | mov esi, dword ptr [ebp + 8] // 33db | xor ebx, ebx // 57 | push edi // 3bf3 | cmp esi, ebx // 0f84ff000000 | je 0x105 $sequence_2 = { 5e 3bc3 0f9fc0 5b c9 c3 53 } // n = 7, score = 200 // 5e | pop esi // 3bc3 | cmp eax, ebx // 0f9fc0 | setg al // 5b | pop ebx // c9 | leave // c3 | ret // 53 | push ebx $sequence_3 = { ff742410 ffd0 c3 6842773b3e 6a07 6a00 e8???????? } // n = 7, score = 200 // ff742410 | push dword ptr [esp + 0x10] // ffd0 | call eax // c3 | ret // 6842773b3e | push 0x3e3b7742 // 6a07 | push 7 // 6a00 | push 0 // e8???????? | $sequence_4 = { 743b 6a04 6a00 56 e8???????? a1???????? 83c40c } // n = 7, score = 200 // 743b | je 0x3d // 6a04 | push 4 // 6a00 | push 0 // 56 | push esi // e8???????? | // a1???????? | // 83c40c | add esp, 0xc $sequence_5 = { c3 68cab54099 6a03 6a00 e8???????? 83c40c ff742408 } // n = 7, score = 200 // c3 | ret // 68cab54099 | push 0x9940b5ca // 6a03 | push 3 // 6a00 | push 0 // e8???????? | // 83c40c | add esp, 0xc // ff742408 | push dword ptr [esp + 8] $sequence_6 = { 83c404 85c0 741e 68???????? ff74240c 6a27 6a00 } // n = 7, score = 200 // 83c404 | add esp, 4 // 85c0 | test eax, eax // 741e | je 0x20 // 68???????? | // ff74240c | push dword ptr [esp + 0xc] // 6a27 | push 0x27 // 6a00 | push 0 $sequence_7 = { ff7508 6a01 56 e8???????? ff7510 6a04 56 } // n = 7, score = 200 // ff7508 | push dword ptr [ebp + 8] // 6a01 | push 1 // 56 | push esi // e8???????? | // ff7510 | push dword ptr [ebp + 0x10] // 6a04 | push 4 // 56 | push esi $sequence_8 = { 56 8b742408 83c61c 833e00 7407 56 e8???????? } // n = 7, score = 200 // 56 | push esi // 8b742408 | mov esi, dword ptr [esp + 8] // 83c61c | add esi, 0x1c // 833e00 | cmp dword ptr [esi], 0 // 7407 | je 9 // 56 | push esi // e8???????? | $sequence_9 = { ff7508 e8???????? 59 84c0 0f85b6000000 8b7d10 85ff } // n = 7, score = 200 // ff7508 | push dword ptr [ebp + 8] // e8???????? | // 59 | pop ecx // 84c0 | test al, al // 0f85b6000000 | jne 0xbc // 8b7d10 | mov edi, dword ptr [ebp + 0x10] // 85ff | test edi, edi condition: 7 of them and filesize < 491520 }
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