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rule win_remcom_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 = { 8985e0edffff ff15???????? 56 ff15???????? 56 ff15???????? 68???????? } // n = 7, score = 100 // 8985e0edffff | mov dword ptr [ebp - 0x1220], eax // ff15???????? | // 56 | push esi // ff15???????? | // 56 | push esi // ff15???????? | // 68???????? | $sequence_1 = { 43 83c708 3b1e 72cc } // n = 4, score = 100 // 43 | inc ebx // 83c708 | add edi, 8 // 3b1e | cmp ebx, dword ptr [esi] // 72cc | jb 0xffffffce $sequence_2 = { 8935???????? ff15???????? 85c0 750a ff15???????? 5e } // n = 6, score = 100 // 8935???????? | // ff15???????? | // 85c0 | test eax, eax // 750a | jne 0xc // ff15???????? | // 5e | pop esi $sequence_3 = { e9???????? 8b1d???????? 8d4ddc 51 6a00 6a00 6a00 } // n = 7, score = 100 // e9???????? | // 8b1d???????? | // 8d4ddc | lea ecx, [ebp - 0x24] // 51 | push ecx // 6a00 | push 0 // 6a00 | push 0 // 6a00 | push 0 $sequence_4 = { c785f4feffff00000000 e8???????? 0fbe8600100000 83c40c 8d8e00100000 f7d8 1bc0 } // n = 7, score = 100 // c785f4feffff00000000 | mov dword ptr [ebp - 0x10c], 0 // e8???????? | // 0fbe8600100000 | movsx eax, byte ptr [esi + 0x1000] // 83c40c | add esp, 0xc // 8d8e00100000 | lea ecx, [esi + 0x1000] // f7d8 | neg eax // 1bc0 | sbb eax, eax $sequence_5 = { 668b4c4310 66890c4578fb4000 40 ebe8 33c0 } // n = 5, score = 100 // 668b4c4310 | mov cx, word ptr [ebx + eax*2 + 0x10] // 66890c4578fb4000 | mov word ptr [eax*2 + 0x40fb78], cx // 40 | inc eax // ebe8 | jmp 0xffffffea // 33c0 | xor eax, eax $sequence_6 = { 83c408 6a00 8d8dd8edffff 51 6a08 } // n = 5, score = 100 // 83c408 | add esp, 8 // 6a00 | push 0 // 8d8dd8edffff | lea ecx, [ebp - 0x1228] // 51 | push ecx // 6a08 | push 8 $sequence_7 = { 56 57 33ff 8db760ec4000 ff36 } // n = 5, score = 100 // 56 | push esi // 57 | push edi // 33ff | xor edi, edi // 8db760ec4000 | lea esi, [edi + 0x40ec60] // ff36 | push dword ptr [esi] $sequence_8 = { 8b4dfc 33cd e8???????? 8be5 5d c3 c785f4feffff01000000 } // n = 7, score = 100 // 8b4dfc | mov ecx, dword ptr [ebp - 4] // 33cd | xor ecx, ebp // e8???????? | // 8be5 | mov esp, ebp // 5d | pop ebp // c3 | ret // c785f4feffff01000000 | mov dword ptr [ebp - 0x10c], 1 $sequence_9 = { 888868ea4000 40 ebe6 ff35???????? ff15???????? 85c0 } // n = 6, score = 100 // 888868ea4000 | mov byte ptr [eax + 0x40ea68], cl // 40 | inc eax // ebe6 | jmp 0xffffffe8 // ff35???????? | // ff15???????? | // 85c0 | test eax, eax condition: 7 of them and filesize < 155648 }
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