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rule win_carberp_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 = { ff7508 8bf0 e8???????? 83c414 8945fc 85c0 7415 } // n = 7, score = 200 // ff7508 | push dword ptr [ebp + 8] // 8bf0 | mov esi, eax // e8???????? | // 83c414 | add esp, 0x14 // 8945fc | mov dword ptr [ebp - 4], eax // 85c0 | test eax, eax // 7415 | je 0x17 $sequence_1 = { 8d45f8 50 57 e8???????? ff75f8 e8???????? 83c410 } // n = 7, score = 200 // 8d45f8 | lea eax, [ebp - 8] // 50 | push eax // 57 | push edi // e8???????? | // ff75f8 | push dword ptr [ebp - 8] // e8???????? | // 83c410 | add esp, 0x10 $sequence_2 = { 53 6aff be0c100000 eb58 6a3c 8d45c4 53 } // n = 7, score = 200 // 53 | push ebx // 6aff | push -1 // be0c100000 | mov esi, 0x100c // eb58 | jmp 0x5a // 6a3c | push 0x3c // 8d45c4 | lea eax, [ebp - 0x3c] // 53 | push ebx $sequence_3 = { 3bc6 77ef 3bc6 74de 2bc6 40 50 } // n = 7, score = 200 // 3bc6 | cmp eax, esi // 77ef | ja 0xfffffff1 // 3bc6 | cmp eax, esi // 74de | je 0xffffffe0 // 2bc6 | sub eax, esi // 40 | inc eax // 50 | push eax $sequence_4 = { 83f8fe 7524 8b460c 3b05???????? 7c19 33c0 e9???????? } // n = 7, score = 200 // 83f8fe | cmp eax, -2 // 7524 | jne 0x26 // 8b460c | mov eax, dword ptr [esi + 0xc] // 3b05???????? | // 7c19 | jl 0x1b // 33c0 | xor eax, eax // e9???????? | $sequence_5 = { ff74240c ffd0 c3 681d5b931f 6a04 6a00 e8???????? } // n = 7, score = 200 // ff74240c | push dword ptr [esp + 0xc] // ffd0 | call eax // c3 | ret // 681d5b931f | push 0x1f935b1d // 6a04 | push 4 // 6a00 | push 0 // e8???????? | $sequence_6 = { 5e c3 6804010000 e8???????? 59 85c0 7501 } // n = 7, score = 200 // 5e | pop esi // c3 | ret // 6804010000 | push 0x104 // e8???????? | // 59 | pop ecx // 85c0 | test eax, eax // 7501 | jne 3 $sequence_7 = { 7432 8d45f8 50 56 e8???????? 8bf0 8d45f8 } // n = 7, score = 200 // 7432 | je 0x34 // 8d45f8 | lea eax, [ebp - 8] // 50 | push eax // 56 | push esi // e8???????? | // 8bf0 | mov esi, eax // 8d45f8 | lea eax, [ebp - 8] $sequence_8 = { 57 53 e8???????? 83c418 ff45fc 56 e8???????? } // n = 7, score = 200 // 57 | push edi // 53 | push ebx // e8???????? | // 83c418 | add esp, 0x18 // ff45fc | inc dword ptr [ebp - 4] // 56 | push esi // e8???????? | $sequence_9 = { ff75f8 ff75fc e8???????? ff75fc e8???????? 83c40c 33c0 } // n = 7, score = 200 // ff75f8 | push dword ptr [ebp - 8] // ff75fc | push dword ptr [ebp - 4] // e8???????? | // ff75fc | push dword ptr [ebp - 4] // e8???????? | // 83c40c | add esp, 0xc // 33c0 | xor eax, eax condition: 7 of them and filesize < 491520 }
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