Actor(s): Anunak
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rule win_carbanak_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-12-22" version = "1" description = "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 = "20201222" malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130" malpedia_version = "20201023" 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 = { 8bec 8b4508 33c9 51 51 51 ff7004 } // n = 7, score = 200 // 8bec | mov ebp, esp // 8b4508 | mov eax, dword ptr [ebp + 8] // 33c9 | xor ecx, ecx // 51 | push ecx // 51 | push ecx // 51 | push ecx // ff7004 | push dword ptr [eax + 4] $sequence_1 = { ff35???????? 8d45d0 50 e8???????? 83c418 8d45b0 ff750c } // n = 7, score = 200 // ff35???????? | // 8d45d0 | lea eax, [ebp - 0x30] // 50 | push eax // e8???????? | // 83c418 | add esp, 0x18 // 8d45b0 | lea eax, [ebp - 0x50] // ff750c | push dword ptr [ebp + 0xc] $sequence_2 = { 83c40c 85c0 0f843a010000 8d8560ffffff 8945f0 8b45c4 8945e8 } // n = 7, score = 200 // 83c40c | add esp, 0xc // 85c0 | test eax, eax // 0f843a010000 | je 0x140 // 8d8560ffffff | lea eax, [ebp - 0xa0] // 8945f0 | mov dword ptr [ebp - 0x10], eax // 8b45c4 | mov eax, dword ptr [ebp - 0x3c] // 8945e8 | mov dword ptr [ebp - 0x18], eax $sequence_3 = { a1???????? 8b0d???????? 8b15???????? eb22 8b15???????? 8b0d???????? a1???????? } // n = 7, score = 200 // a1???????? | // 8b0d???????? | // 8b15???????? | // eb22 | jmp 0x24 // 8b15???????? | // 8b0d???????? | // a1???????? | $sequence_4 = { e8???????? 59 59 8945f4 85c0 7508 83c8ff } // n = 7, score = 200 // e8???????? | // 59 | pop ecx // 59 | pop ecx // 8945f4 | mov dword ptr [ebp - 0xc], eax // 85c0 | test eax, eax // 7508 | jne 0xa // 83c8ff | or eax, 0xffffffff $sequence_5 = { e8???????? 59 59 ffd0 8b45fc 5e } // n = 6, score = 200 // e8???????? | // 59 | pop ecx // 59 | pop ecx // ffd0 | call eax // 8b45fc | mov eax, dword ptr [ebp - 4] // 5e | pop esi $sequence_6 = { bb???????? 85c0 7e22 ba???????? 3932 740d 41 } // n = 7, score = 200 // bb???????? | // 85c0 | test eax, eax // 7e22 | jle 0x24 // ba???????? | // 3932 | cmp dword ptr [edx], esi // 740d | je 0xf // 41 | inc ecx $sequence_7 = { 8b5604 48 3bd0 7d14 8b0e 8a4508 88040a } // n = 7, score = 200 // 8b5604 | mov edx, dword ptr [esi + 4] // 48 | dec eax // 3bd0 | cmp edx, eax // 7d14 | jge 0x16 // 8b0e | mov ecx, dword ptr [esi] // 8a4508 | mov al, byte ptr [ebp + 8] // 88040a | mov byte ptr [edx + ecx], al $sequence_8 = { 56 68???????? 50 be031d3c0b 56 57 e8???????? } // n = 7, score = 200 // 56 | push esi // 68???????? | // 50 | push eax // be031d3c0b | mov esi, 0xb3c1d03 // 56 | push esi // 57 | push edi // e8???????? | $sequence_9 = { 8d45f0 50 e8???????? ff75f4 ff75f0 6a00 } // n = 6, score = 200 // 8d45f0 | lea eax, [ebp - 0x10] // 50 | push eax // e8???????? | // ff75f4 | push dword ptr [ebp - 0xc] // ff75f0 | push dword ptr [ebp - 0x10] // 6a00 | push 0 condition: 7 of them and filesize < 425984 }
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