Actor(s): TeleBots
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rule win_credraptor_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" version = "1" description = "Detects win.credraptor." 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.credraptor" malpedia_rule_date = "20220405" malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a" malpedia_version = "20220411" 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 = { c60100 6a01 8d0c00 52 b8???????? 8d5308 e8???????? } // n = 7, score = 100 // c60100 | mov byte ptr [ecx], 0 // 6a01 | push 1 // 8d0c00 | lea ecx, dword ptr [eax + eax] // 52 | push edx // b8???????? | // 8d5308 | lea edx, dword ptr [ebx + 8] // e8???????? | $sequence_1 = { 8d95f8feffff 56 52 e8???????? 8dbdf8feffff 83c40c 4f } // n = 7, score = 100 // 8d95f8feffff | lea edx, dword ptr [ebp - 0x108] // 56 | push esi // 52 | push edx // e8???????? | // 8dbdf8feffff | lea edi, dword ptr [ebp - 0x108] // 83c40c | add esp, 0xc // 4f | dec edi $sequence_2 = { e9???????? 8b4d18 8b5114 8b4508 8b4838 8b703c 895528 } // n = 7, score = 100 // e9???????? | // 8b4d18 | mov ecx, dword ptr [ebp + 0x18] // 8b5114 | mov edx, dword ptr [ecx + 0x14] // 8b4508 | mov eax, dword ptr [ebp + 8] // 8b4838 | mov ecx, dword ptr [eax + 0x38] // 8b703c | mov esi, dword ptr [eax + 0x3c] // 895528 | mov dword ptr [ebp + 0x28], edx $sequence_3 = { ffd0 83c414 015e48 8945f4 83564c00 015dfc 85c0 } // n = 7, score = 100 // ffd0 | call eax // 83c414 | add esp, 0x14 // 015e48 | add dword ptr [esi + 0x48], ebx // 8945f4 | mov dword ptr [ebp - 0xc], eax // 83564c00 | adc dword ptr [esi + 0x4c], 0 // 015dfc | add dword ptr [ebp - 4], ebx // 85c0 | test eax, eax $sequence_4 = { 85c0 0f8ebf030000 8d9618030000 8955f0 8945dc 8d4900 8b45f0 } // n = 7, score = 100 // 85c0 | test eax, eax // 0f8ebf030000 | jle 0x3c5 // 8d9618030000 | lea edx, dword ptr [esi + 0x318] // 8955f0 | mov dword ptr [ebp - 0x10], edx // 8945dc | mov dword ptr [ebp - 0x24], eax // 8d4900 | lea ecx, dword ptr [ecx] // 8b45f0 | mov eax, dword ptr [ebp - 0x10] $sequence_5 = { e8???????? 8bf0 83c404 85f6 7414 8b5744 52 } // n = 7, score = 100 // e8???????? | // 8bf0 | mov esi, eax // 83c404 | add esp, 4 // 85f6 | test esi, esi // 7414 | je 0x16 // 8b5744 | mov edx, dword ptr [edi + 0x44] // 52 | push edx $sequence_6 = { 89480c 894810 66c7005f00 8b7320 8b5318 397254 7f0d } // n = 7, score = 100 // 89480c | mov dword ptr [eax + 0xc], ecx // 894810 | mov dword ptr [eax + 0x10], ecx // 66c7005f00 | mov word ptr [eax], 0x5f // 8b7320 | mov esi, dword ptr [ebx + 0x20] // 8b5318 | mov edx, dword ptr [ebx + 0x18] // 397254 | cmp dword ptr [edx + 0x54], esi // 7f0d | jg 0xf $sequence_7 = { b8???????? 83c9ff e8???????? 8b55fc 83c408 8a4514 81fb84000000 } // n = 7, score = 100 // b8???????? | // 83c9ff | or ecx, 0xffffffff // e8???????? | // 8b55fc | mov edx, dword ptr [ebp - 4] // 83c408 | add esp, 8 // 8a4514 | mov al, byte ptr [ebp + 0x14] // 81fb84000000 | cmp ebx, 0x84 $sequence_8 = { e8???????? 8b4d0c 83c40c 8d45fc 50 51 57 } // n = 7, score = 100 // e8???????? | // 8b4d0c | mov ecx, dword ptr [ebp + 0xc] // 83c40c | add esp, 0xc // 8d45fc | lea eax, dword ptr [ebp - 4] // 50 | push eax // 51 | push ecx // 57 | push edi $sequence_9 = { 8da42400000000 38043a 7507 83c202 3bd3 7cf4 33db } // n = 7, score = 100 // 8da42400000000 | lea esp, dword ptr [esp] // 38043a | cmp byte ptr [edx + edi], al // 7507 | jne 9 // 83c202 | add edx, 2 // 3bd3 | cmp edx, ebx // 7cf4 | jl 0xfffffff6 // 33db | xor ebx, ebx condition: 7 of them and filesize < 1728512 }
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