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rule win_carberp_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" 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 = "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 = { b8???????? 50 6a00 50 e8???????? 8b4518 8945e4 } // n = 7, score = 200 // b8???????? | // 50 | push eax // 6a00 | push 0 // 50 | push eax // e8???????? | // 8b4518 | mov eax, dword ptr [ebp + 0x18] // 8945e4 | mov dword ptr [ebp - 0x1c], eax $sequence_1 = { 68f5a40f7d 6a0d 6a00 e8???????? 68da6772c2 6a0d 6a00 } // n = 7, score = 200 // 68f5a40f7d | push 0x7d0fa4f5 // 6a0d | push 0xd // 6a00 | push 0 // e8???????? | // 68da6772c2 | push 0xc27267da // 6a0d | push 0xd // 6a00 | push 0 $sequence_2 = { ff75fc 56 ff15???????? 8bf0 8d45f8 50 e8???????? } // n = 7, score = 200 // ff75fc | push dword ptr [ebp - 4] // 56 | push esi // ff15???????? | // 8bf0 | mov esi, eax // 8d45f8 | lea eax, [ebp - 8] // 50 | push eax // e8???????? | $sequence_3 = { 0f848d000000 6683f832 0f8483000000 6683f821 0f8548010000 57 8d8588fdffff } // n = 7, score = 200 // 0f848d000000 | je 0x93 // 6683f832 | cmp ax, 0x32 // 0f8483000000 | je 0x89 // 6683f821 | cmp ax, 0x21 // 0f8548010000 | jne 0x14e // 57 | push edi // 8d8588fdffff | lea eax, [ebp - 0x278] $sequence_4 = { 7407 50 e8???????? 59 ff45f4 8b45f4 3b45f0 } // n = 7, score = 200 // 7407 | je 9 // 50 | push eax // e8???????? | // 59 | pop ecx // ff45f4 | inc dword ptr [ebp - 0xc] // 8b45f4 | mov eax, dword ptr [ebp - 0xc] // 3b45f0 | cmp eax, dword ptr [ebp - 0x10] $sequence_5 = { 668945f6 58 6a72 668945f8 58 6a5c 668945fa } // n = 7, score = 200 // 668945f6 | mov word ptr [ebp - 0xa], ax // 58 | pop eax // 6a72 | push 0x72 // 668945f8 | mov word ptr [ebp - 8], ax // 58 | pop eax // 6a5c | push 0x5c // 668945fa | mov word ptr [ebp - 6], ax $sequence_6 = { ff7658 e8???????? 83c418 83665800 5e 5d c3 } // n = 7, score = 200 // ff7658 | push dword ptr [esi + 0x58] // e8???????? | // 83c418 | add esp, 0x18 // 83665800 | and dword ptr [esi + 0x58], 0 // 5e | pop esi // 5d | pop ebp // c3 | ret $sequence_7 = { 59 59 85f6 7419 ff7510 56 6a04 } // n = 7, score = 200 // 59 | pop ecx // 59 | pop ecx // 85f6 | test esi, esi // 7419 | je 0x1b // ff7510 | push dword ptr [ebp + 0x10] // 56 | push esi // 6a04 | push 4 $sequence_8 = { 6800000040 ff7508 ffd0 8bf8 83ffff 7504 33c0 } // n = 7, score = 200 // 6800000040 | push 0x40000000 // ff7508 | push dword ptr [ebp + 8] // ffd0 | call eax // 8bf8 | mov edi, eax // 83ffff | cmp edi, -1 // 7504 | jne 6 // 33c0 | xor eax, eax $sequence_9 = { c645f867 c645f96c c645fa57 c645fb6e c645fc64 885dfd 895dc8 } // n = 7, score = 200 // c645f867 | mov byte ptr [ebp - 8], 0x67 // c645f96c | mov byte ptr [ebp - 7], 0x6c // c645fa57 | mov byte ptr [ebp - 6], 0x57 // c645fb6e | mov byte ptr [ebp - 5], 0x6e // c645fc64 | mov byte ptr [ebp - 4], 0x64 // 885dfd | mov byte ptr [ebp - 3], bl // 895dc8 | mov dword ptr [ebp - 0x38], ebx condition: 7 of them and filesize < 491520 }
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