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 = "2023-12-06" 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 = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = { ff7508 e8???????? 59 50 ff7508 ff15???????? 56 } // n = 7, score = 200 // ff7508 | push dword ptr [ebp + 8] // e8???????? | // 59 | pop ecx // 50 | push eax // ff7508 | push dword ptr [ebp + 8] // ff15???????? | // 56 | push esi $sequence_1 = { e8???????? ff750c 8d85ecfdffff 50 e8???????? } // n = 5, score = 200 // e8???????? | // ff750c | push dword ptr [ebp + 0xc] // 8d85ecfdffff | lea eax, [ebp - 0x214] // 50 | push eax // e8???????? | $sequence_2 = { ff15???????? 83c41c 6a01 58 5e c9 } // n = 6, score = 200 // ff15???????? | // 83c41c | add esp, 0x1c // 6a01 | push 1 // 58 | pop eax // 5e | pop esi // c9 | leave $sequence_3 = { 85f6 7437 56 6a01 } // n = 4, score = 200 // 85f6 | test esi, esi // 7437 | je 0x39 // 56 | push esi // 6a01 | push 1 $sequence_4 = { ff7508 8d85f8feffff 50 e8???????? 8065fe00 8d45fc 50 } // n = 7, score = 200 // ff7508 | push dword ptr [ebp + 8] // 8d85f8feffff | lea eax, [ebp - 0x108] // 50 | push eax // e8???????? | // 8065fe00 | and byte ptr [ebp - 2], 0 // 8d45fc | lea eax, [ebp - 4] // 50 | push eax $sequence_5 = { 83c428 6a32 ff15???????? 8d85f8faffff 50 68???????? } // n = 6, score = 200 // 83c428 | add esp, 0x28 // 6a32 | push 0x32 // ff15???????? | // 8d85f8faffff | lea eax, [ebp - 0x508] // 50 | push eax // 68???????? | $sequence_6 = { 56 57 8d85f8faffff 6a01 50 ff15???????? 80a43df8faffff00 } // n = 7, score = 200 // 56 | push esi // 57 | push edi // 8d85f8faffff | lea eax, [ebp - 0x508] // 6a01 | push 1 // 50 | push eax // ff15???????? | // 80a43df8faffff00 | and byte ptr [ebp + edi - 0x508], 0 $sequence_7 = { 50 8d85f8feffff 50 c645fc72 } // n = 4, score = 200 // 50 | push eax // 8d85f8feffff | lea eax, [ebp - 0x108] // 50 | push eax // c645fc72 | mov byte ptr [ebp - 4], 0x72 $sequence_8 = { 756b 57 b940000000 8d7c240d 8844240c f3ab } // n = 6, score = 100 // 756b | jne 0x6d // 57 | push edi // b940000000 | mov ecx, 0x40 // 8d7c240d | lea edi, [esp + 0xd] // 8844240c | mov byte ptr [esp + 0xc], al // f3ab | rep stosd dword ptr es:[edi], eax $sequence_9 = { f3aa 8bcb 8d7c2474 8bc1 } // n = 4, score = 100 // f3aa | rep stosb byte ptr es:[edi], al // 8bcb | mov ecx, ebx // 8d7c2474 | lea edi, [esp + 0x74] // 8bc1 | mov eax, ecx $sequence_10 = { e8???????? 8d4c2410 c684240004000007 e8???????? 68b6000000 8d542414 } // n = 6, score = 100 // e8???????? | // 8d4c2410 | lea ecx, [esp + 0x10] // c684240004000007 | mov byte ptr [esp + 0x400], 7 // e8???????? | // 68b6000000 | push 0xb6 // 8d542414 | lea edx, [esp + 0x14] $sequence_11 = { 8d8c2488000000 e8???????? 57 57 8d4c2424 } // n = 5, score = 100 // 8d8c2488000000 | lea ecx, [esp + 0x88] // e8???????? | // 57 | push edi // 57 | push edi // 8d4c2424 | lea ecx, [esp + 0x24] $sequence_12 = { e8???????? 8d4c2428 c684240004000005 e8???????? 8d4c2414 c684240004000004 } // n = 6, score = 100 // e8???????? | // 8d4c2428 | lea ecx, [esp + 0x28] // c684240004000005 | mov byte ptr [esp + 0x400], 5 // e8???????? | // 8d4c2414 | lea ecx, [esp + 0x14] // c684240004000004 | mov byte ptr [esp + 0x400], 4 $sequence_13 = { 8b35???????? a3???????? ffd6 3db7000000 7418 } // n = 5, score = 100 // 8b35???????? | // a3???????? | // ffd6 | call esi // 3db7000000 | cmp eax, 0xb7 // 7418 | je 0x1a $sequence_14 = { 89442418 8b4309 84c9 7403 50 } // n = 5, score = 100 // 89442418 | mov dword ptr [esp + 0x18], eax // 8b4309 | mov eax, dword ptr [ebx + 9] // 84c9 | test cl, cl // 7403 | je 5 // 50 | push eax $sequence_15 = { f3a5 8bcb 8d9424f8020000 83e103 f3a4 bf???????? 83c9ff } // n = 7, score = 100 // f3a5 | rep movsd dword ptr es:[edi], dword ptr [esi] // 8bcb | mov ecx, ebx // 8d9424f8020000 | lea edx, [esp + 0x2f8] // 83e103 | and ecx, 3 // f3a4 | rep movsb byte ptr es:[edi], byte ptr [esi] // bf???????? | // 83c9ff | or ecx, 0xffffffff condition: 7 of them and filesize < 57344 }
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