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rule win_remcom_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" 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 = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { 6a01 6a00 6a01 8d4de0 51 ffd3 8d45f4 } // n = 7, score = 100 // 6a01 | push 1 // 6a00 | push 0 // 6a01 | push 1 // 8d4de0 | lea ecx, [ebp - 0x20] // 51 | push ecx // ffd3 | call ebx // 8d45f4 | lea eax, [ebp - 0xc] $sequence_1 = { e8???????? 83c414 85c0 7515 5f b802000000 } // n = 6, score = 100 // e8???????? | // 83c414 | add esp, 0x14 // 85c0 | test eax, eax // 7515 | jne 0x17 // 5f | pop edi // b802000000 | mov eax, 2 $sequence_2 = { 897de0 ff15???????? 33db 50 53 68ffff1f00 } // n = 6, score = 100 // 897de0 | mov dword ptr [ebp - 0x20], edi // ff15???????? | // 33db | xor ebx, ebx // 50 | push eax // 53 | push ebx // 68ffff1f00 | push 0x1fffff $sequence_3 = { 6aff 6a00 6a00 68ff000000 6a04 6a02 } // n = 6, score = 100 // 6aff | push -1 // 6a00 | push 0 // 6a00 | push 0 // 68ff000000 | push 0xff // 6a04 | push 4 // 6a02 | push 2 $sequence_4 = { ff15???????? 8b85f4feffff 5b 5f 5e 8b4dfc } // n = 6, score = 100 // ff15???????? | // 8b85f4feffff | mov eax, dword ptr [ebp - 0x10c] // 5b | pop ebx // 5f | pop edi // 5e | pop esi // 8b4dfc | mov ecx, dword ptr [ebp - 4] $sequence_5 = { ff15???????? 8bf0 85f6 74a5 6a00 56 ff15???????? } // n = 7, score = 100 // ff15???????? | // 8bf0 | mov esi, eax // 85f6 | test esi, esi // 74a5 | je 0xffffffa7 // 6a00 | push 0 // 56 | push esi // ff15???????? | $sequence_6 = { eb12 8b45e0 8a806ceb4000 08443b1d } // n = 4, score = 100 // eb12 | jmp 0x14 // 8b45e0 | mov eax, dword ptr [ebp - 0x20] // 8a806ceb4000 | mov al, byte ptr [eax + 0x40eb6c] // 08443b1d | or byte ptr [ebx + edi + 0x1d], al $sequence_7 = { 33c0 50 8985e0edffff 8985e4edffff 8d85dcedffff 50 6814120000 } // n = 7, score = 100 // 33c0 | xor eax, eax // 50 | push eax // 8985e0edffff | mov dword ptr [ebp - 0x1220], eax // 8985e4edffff | mov dword ptr [ebp - 0x121c], eax // 8d85dcedffff | lea eax, [ebp - 0x1224] // 50 | push eax // 6814120000 | push 0x1214 $sequence_8 = { 57 33f6 bf???????? 833cf52ce5400001 751e 8d04f528e54000 } // n = 6, score = 100 // 57 | push edi // 33f6 | xor esi, esi // bf???????? | // 833cf52ce5400001 | cmp dword ptr [esi*8 + 0x40e52c], 1 // 751e | jne 0x20 // 8d04f528e54000 | lea eax, [esi*8 + 0x40e528] $sequence_9 = { 50 6814120000 8d8de8edffff 51 56 } // n = 5, score = 100 // 50 | push eax // 6814120000 | push 0x1214 // 8d8de8edffff | lea ecx, [ebp - 0x1218] // 51 | push ecx // 56 | push esi condition: 7 of them and filesize < 155648 }
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