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rule win_remcom_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" version = "1" description = "Detects win.remcom." 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.remcom" 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 = { c705????????30000000 c705????????02000000 c705????????01000000 8935???????? 8935???????? 8935???????? 8935???????? } // n = 7, score = 100 // c705????????30000000 | // c705????????02000000 | // c705????????01000000 | // 8935???????? | // 8935???????? | // 8935???????? | // 8935???????? | $sequence_1 = { 8b0485e0fc4000 83e61f c1e606 8d443004 8020fd 8b45f8 8b55fc } // n = 7, score = 100 // 8b0485e0fc4000 | mov eax, dword ptr [eax*4 + 0x40fce0] // 83e61f | and esi, 0x1f // c1e606 | shl esi, 6 // 8d443004 | lea eax, dword ptr [eax + esi + 4] // 8020fd | and byte ptr [eax], 0xfd // 8b45f8 | mov eax, dword ptr [ebp - 8] // 8b55fc | mov edx, dword ptr [ebp - 4] $sequence_2 = { 0010 8340008a 46 0323 d188470383ee } // n = 5, score = 100 // 0010 | add byte ptr [eax], dl // 8340008a | add dword ptr [eax], -0x76 // 46 | inc esi // 0323 | add esp, dword ptr [ebx] // d188470383ee | ror dword ptr [eax - 0x117cfcb9], 1 $sequence_3 = { 8955f8 c745fc01000000 ff15???????? 8bf0 85f6 74a5 } // n = 6, score = 100 // 8955f8 | mov dword ptr [ebp - 8], edx // c745fc01000000 | mov dword ptr [ebp - 4], 1 // ff15???????? | // 8bf0 | mov esi, eax // 85f6 | test esi, esi // 74a5 | je 0xffffffa7 $sequence_4 = { 57 8d3c85ccf54000 833f00 bb00100000 } // n = 4, score = 100 // 57 | push edi // 8d3c85ccf54000 | lea edi, dword ptr [eax*4 + 0x40f5cc] // 833f00 | cmp dword ptr [edi], 0 // bb00100000 | mov ebx, 0x1000 $sequence_5 = { 8bec 83ec14 8d45fc 50 c745ecc8b14000 c745f010134000 } // n = 6, score = 100 // 8bec | mov ebp, esp // 83ec14 | sub esp, 0x14 // 8d45fc | lea eax, dword ptr [ebp - 4] // 50 | push eax // c745ecc8b14000 | mov dword ptr [ebp - 0x14], 0x40b1c8 // c745f010134000 | mov dword ptr [ebp - 0x10], 0x401310 $sequence_6 = { 7416 8bc8 83e11f 8bf0 c1fe05 c1e106 030cb5e0fc4000 } // n = 7, score = 100 // 7416 | je 0x18 // 8bc8 | mov ecx, eax // 83e11f | and ecx, 0x1f // 8bf0 | mov esi, eax // c1fe05 | sar esi, 5 // c1e106 | shl ecx, 6 // 030cb5e0fc4000 | add ecx, dword ptr [esi*4 + 0x40fce0] $sequence_7 = { 750c a1???????? 50 ff15???????? 8b4dfc 33cd e8???????? } // n = 7, score = 100 // 750c | jne 0xe // a1???????? | // 50 | push eax // ff15???????? | // 8b4dfc | mov ecx, dword ptr [ebp - 4] // 33cd | xor ecx, ebp // e8???????? | $sequence_8 = { 51 6a08 8d95e0edffff 52 56 8985e0edffff ff15???????? } // n = 7, score = 100 // 51 | push ecx // 6a08 | push 8 // 8d95e0edffff | lea edx, dword ptr [ebp - 0x1220] // 52 | push edx // 56 | push esi // 8985e0edffff | mov dword ptr [ebp - 0x1220], eax // ff15???????? | $sequence_9 = { 8d3c85ccf54000 833f00 bb00100000 7520 53 e8???????? 59 } // n = 7, score = 100 // 8d3c85ccf54000 | lea edi, dword ptr [eax*4 + 0x40f5cc] // 833f00 | cmp dword ptr [edi], 0 // bb00100000 | mov ebx, 0x1000 // 7520 | jne 0x22 // 53 | push ebx // e8???????? | // 59 | pop ecx condition: 7 of them and filesize < 155648 }
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