Actor(s): FIN7
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rule win_carbanak_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" version = "1" description = "Detects win.carbanak." 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.carbanak" malpedia_rule_date = "20220513" malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26" malpedia_version = "20220516" 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 = { 8d83c4010000 50 8d8db4fcffff e8???????? 8d8db4fcffff e8???????? 8b75ec } // n = 7, score = 200 // 8d83c4010000 | lea eax, [ebx + 0x1c4] // 50 | push eax // 8d8db4fcffff | lea ecx, [ebp - 0x34c] // e8???????? | // 8d8db4fcffff | lea ecx, [ebp - 0x34c] // e8???????? | // 8b75ec | mov esi, dword ptr [ebp - 0x14] $sequence_1 = { 56 8bcf e8???????? 84c0 7507 8b7708 } // n = 6, score = 200 // 56 | push esi // 8bcf | mov ecx, edi // e8???????? | // 84c0 | test al, al // 7507 | jne 9 // 8b7708 | mov esi, dword ptr [edi + 8] $sequence_2 = { 50 e8???????? 8bf8 59 85ff 747e 8b4dfc } // n = 7, score = 200 // 50 | push eax // e8???????? | // 8bf8 | mov edi, eax // 59 | pop ecx // 85ff | test edi, edi // 747e | je 0x80 // 8b4dfc | mov ecx, dword ptr [ebp - 4] $sequence_3 = { ff30 6821b2c90d 6a01 e8???????? 59 59 ffd0 } // n = 7, score = 200 // ff30 | push dword ptr [eax] // 6821b2c90d | push 0xdc9b221 // 6a01 | push 1 // e8???????? | // 59 | pop ecx // 59 | pop ecx // ffd0 | call eax $sequence_4 = { 6a3c e8???????? 83c40c 85c0 7409 8bc8 e8???????? } // n = 7, score = 200 // 6a3c | push 0x3c // e8???????? | // 83c40c | add esp, 0xc // 85c0 | test eax, eax // 7409 | je 0xb // 8bc8 | mov ecx, eax // e8???????? | $sequence_5 = { eb11 6a00 ff7514 57 ff7508 e8???????? } // n = 6, score = 200 // eb11 | jmp 0x13 // 6a00 | push 0 // ff7514 | push dword ptr [ebp + 0x14] // 57 | push edi // ff7508 | push dword ptr [ebp + 8] // e8???????? | $sequence_6 = { 50 e8???????? 83ec28 8d75cc 6a0c 59 8bfc } // n = 7, score = 200 // 50 | push eax // e8???????? | // 83ec28 | sub esp, 0x28 // 8d75cc | lea esi, [ebp - 0x34] // 6a0c | push 0xc // 59 | pop ecx // 8bfc | mov edi, esp $sequence_7 = { 0f851f010000 f605????????20 7413 8b486c ba00200000 6685540146 0f8403010000 } // n = 7, score = 200 // 0f851f010000 | jne 0x125 // f605????????20 | // 7413 | je 0x15 // 8b486c | mov ecx, dword ptr [eax + 0x6c] // ba00200000 | mov edx, 0x2000 // 6685540146 | test word ptr [ecx + eax + 0x46], dx // 0f8403010000 | je 0x109 $sequence_8 = { ff75ec ff75e8 57 56 ff30 e8???????? ff75fc } // n = 7, score = 200 // ff75ec | push dword ptr [ebp - 0x14] // ff75e8 | push dword ptr [ebp - 0x18] // 57 | push edi // 56 | push esi // ff30 | push dword ptr [eax] // e8???????? | // ff75fc | push dword ptr [ebp - 4] $sequence_9 = { f77d0c 83c410 6aff 53 6880000000 6bc018 } // n = 6, score = 200 // f77d0c | idiv dword ptr [ebp + 0xc] // 83c410 | add esp, 0x10 // 6aff | push -1 // 53 | push ebx // 6880000000 | push 0x80 // 6bc018 | imul eax, eax, 0x18 condition: 7 of them and filesize < 425984 }
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