Actor(s): DragonOK
There is no description at this point.
rule win_rambo_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.rambo." 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.rambo" malpedia_rule_date = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { ff15???????? 56 8bf8 ff15???????? 56 57 } // n = 6, score = 200 // ff15???????? | // 56 | push esi // 8bf8 | mov edi, eax // ff15???????? | // 56 | push esi // 57 | push edi $sequence_1 = { 8d85f0feffff 56 50 6804010000 ff15???????? 8d85f0feffff 50 } // n = 7, score = 200 // 8d85f0feffff | lea eax, [ebp - 0x110] // 56 | push esi // 50 | push eax // 6804010000 | push 0x104 // ff15???????? | // 8d85f0feffff | lea eax, [ebp - 0x110] // 50 | push eax $sequence_2 = { 81ec08050000 56 6800040000 8d85f8faffff } // n = 4, score = 200 // 81ec08050000 | sub esp, 0x508 // 56 | push esi // 6800040000 | push 0x400 // 8d85f8faffff | lea eax, [ebp - 0x508] $sequence_3 = { 50 c645fc72 c645fd62 ff15???????? } // n = 4, score = 200 // 50 | push eax // c645fc72 | mov byte ptr [ebp - 4], 0x72 // c645fd62 | mov byte ptr [ebp - 3], 0x62 // ff15???????? | $sequence_4 = { 8d85f8faffff 50 68???????? e8???????? 59 59 6a01 } // n = 7, score = 200 // 8d85f8faffff | lea eax, [ebp - 0x508] // 50 | push eax // 68???????? | // e8???????? | // 59 | pop ecx // 59 | pop ecx // 6a01 | push 1 $sequence_5 = { c3 55 8bec 81ec14020000 8d85f0feffff } // n = 5, score = 200 // c3 | ret // 55 | push ebp // 8bec | mov ebp, esp // 81ec14020000 | sub esp, 0x214 // 8d85f0feffff | lea eax, [ebp - 0x110] $sequence_6 = { ff15???????? 80a43df8faffff00 56 ff15???????? 83c428 6a32 ff15???????? } // n = 7, score = 200 // ff15???????? | // 80a43df8faffff00 | and byte ptr [ebp + edi - 0x508], 0 // 56 | push esi // ff15???????? | // 83c428 | add esp, 0x28 // 6a32 | push 0x32 // ff15???????? | $sequence_7 = { ff15???????? ff7508 8d85fcfeffff 50 e8???????? 59 8d85fcfeffff } // n = 7, score = 200 // ff15???????? | // ff7508 | push dword ptr [ebp + 8] // 8d85fcfeffff | lea eax, [ebp - 0x104] // 50 | push eax // e8???????? | // 59 | pop ecx // 8d85fcfeffff | lea eax, [ebp - 0x104] $sequence_8 = { 8bca 8d542474 83e103 f3aa 8bcb } // n = 5, score = 100 // 8bca | mov ecx, edx // 8d542474 | lea edx, [esp + 0x74] // 83e103 | and ecx, 3 // f3aa | rep stosb byte ptr es:[edi], al // 8bcb | mov ecx, ebx $sequence_9 = { 8bcb 33c0 8d7c2474 c1e902 f3ab 8bca } // n = 6, score = 100 // 8bcb | mov ecx, ebx // 33c0 | xor eax, eax // 8d7c2474 | lea edi, [esp + 0x74] // c1e902 | shr ecx, 2 // f3ab | rep stosd dword ptr es:[edi], eax // 8bca | mov ecx, edx $sequence_10 = { 4a 85c0 7452 42 8b5c2424 8b6c2410 } // n = 6, score = 100 // 4a | dec edx // 85c0 | test eax, eax // 7452 | je 0x54 // 42 | inc edx // 8b5c2424 | mov ebx, dword ptr [esp + 0x24] // 8b6c2410 | mov ebp, dword ptr [esp + 0x10] $sequence_11 = { 8d0c1e 8907 46 83c704 81fe80841e00 } // n = 5, score = 100 // 8d0c1e | lea ecx, [esi + ebx] // 8907 | mov dword ptr [edi], eax // 46 | inc esi // 83c704 | add edi, 4 // 81fe80841e00 | cmp esi, 0x1e8480 $sequence_12 = { e8???????? 8d4c2414 c684240004000004 e8???????? 8d4c2428 } // n = 5, score = 100 // e8???????? | // 8d4c2414 | lea ecx, [esp + 0x14] // c684240004000004 | mov byte ptr [esp + 0x400], 4 // e8???????? | // 8d4c2428 | lea ecx, [esp + 0x28] $sequence_13 = { 89842494000000 8b442424 6a00 50 8d8c24a4000000 e8???????? 8d4c241c } // n = 7, score = 100 // 89842494000000 | mov dword ptr [esp + 0x94], eax // 8b442424 | mov eax, dword ptr [esp + 0x24] // 6a00 | push 0 // 50 | push eax // 8d8c24a4000000 | lea ecx, [esp + 0xa4] // e8???????? | // 8d4c241c | lea ecx, [esp + 0x1c] $sequence_14 = { e8???????? 6804010000 8d4c2424 c68424040400000b e8???????? } // n = 5, score = 100 // e8???????? | // 6804010000 | push 0x104 // 8d4c2424 | lea ecx, [esp + 0x24] // c68424040400000b | mov byte ptr [esp + 0x404], 0xb // e8???????? | $sequence_15 = { c644244539 c644244634 c644244738 88542448 8854244a } // n = 5, score = 100 // c644244539 | mov byte ptr [esp + 0x45], 0x39 // c644244634 | mov byte ptr [esp + 0x46], 0x34 // c644244738 | mov byte ptr [esp + 0x47], 0x38 // 88542448 | mov byte ptr [esp + 0x48], dl // 8854244a | mov byte ptr [esp + 0x4a], dl condition: 7 of them and filesize < 57344 }
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