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 = "2023-01-25" 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 = "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 = { 5e c9 c3 55 8bec 81ec08050000 } // n = 6, score = 200 // 5e | pop esi // c9 | leave // c3 | ret // 55 | push ebp // 8bec | mov ebp, esp // 81ec08050000 | sub esp, 0x508 $sequence_1 = { 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_2 = { 50 e8???????? ff750c 8d85ecfdffff 50 e8???????? 8065fb00 } // n = 7, score = 200 // 50 | push eax // e8???????? | // ff750c | push dword ptr [ebp + 0xc] // 8d85ecfdffff | lea eax, [ebp - 0x214] // 50 | push eax // e8???????? | // 8065fb00 | and byte ptr [ebp - 5], 0 $sequence_3 = { 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_4 = { 50 6804010000 ff15???????? 8d85f0feffff 50 8d85ecfdffff 50 } // n = 7, score = 200 // 50 | push eax // 6804010000 | push 0x104 // ff15???????? | // 8d85f0feffff | lea eax, [ebp - 0x110] // 50 | push eax // 8d85ecfdffff | lea eax, [ebp - 0x214] // 50 | push eax $sequence_5 = { 6a01 50 ff15???????? 80a43df8faffff00 } // n = 4, score = 200 // 6a01 | push 1 // 50 | push eax // ff15???????? | // 80a43df8faffff00 | and byte ptr [ebp + edi - 0x508], 0 $sequence_6 = { 6804010000 ff15???????? ff7508 8d85f8feffff 50 e8???????? } // n = 6, score = 200 // 6804010000 | push 0x104 // ff15???????? | // ff7508 | push dword ptr [ebp + 8] // 8d85f8feffff | lea eax, [ebp - 0x108] // 50 | push eax // e8???????? | $sequence_7 = { 83c41c 6a01 58 5e } // n = 4, score = 200 // 83c41c | add esp, 0x1c // 6a01 | push 1 // 58 | pop eax // 5e | pop esi $sequence_8 = { e8???????? 8d4c242c c7842400040000ffffffff e8???????? 33c0 8b8c24f8030000 } // n = 6, score = 100 // e8???????? | // 8d4c242c | lea ecx, [esp + 0x2c] // c7842400040000ffffffff | mov dword ptr [esp + 0x400], 0xffffffff // e8???????? | // 33c0 | xor eax, eax // 8b8c24f8030000 | mov ecx, dword ptr [esp + 0x3f8] $sequence_9 = { 52 8d8c24c0000000 89842480000000 e8???????? 8b44245c } // n = 5, score = 100 // 52 | push edx // 8d8c24c0000000 | lea ecx, [esp + 0xc0] // 89842480000000 | mov dword ptr [esp + 0x80], eax // e8???????? | // 8b44245c | mov eax, dword ptr [esp + 0x5c] $sequence_10 = { e8???????? 50 8d4c2418 c68424040400000c e8???????? } // n = 5, score = 100 // e8???????? | // 50 | push eax // 8d4c2418 | lea ecx, [esp + 0x18] // c68424040400000c | mov byte ptr [esp + 0x404], 0xc // e8???????? | $sequence_11 = { 8844244c b030 b243 8844244f 88442455 8d442434 } // n = 6, score = 100 // 8844244c | mov byte ptr [esp + 0x4c], al // b030 | mov al, 0x30 // b243 | mov dl, 0x43 // 8844244f | mov byte ptr [esp + 0x4f], al // 88442455 | mov byte ptr [esp + 0x55], al // 8d442434 | lea eax, [esp + 0x34] $sequence_12 = { 8dbc24ec000000 be???????? f3ab b906000000 8dbc24d0000000 } // n = 5, score = 100 // 8dbc24ec000000 | lea edi, [esp + 0xec] // be???????? | // f3ab | rep stosd dword ptr es:[edi], eax // b906000000 | mov ecx, 6 // 8dbc24d0000000 | lea edi, [esp + 0xd0] $sequence_13 = { 03dd 8b6c2418 33c3 8d1c39 33c3 } // n = 5, score = 100 // 03dd | add ebx, ebp // 8b6c2418 | mov ebp, dword ptr [esp + 0x18] // 33c3 | xor eax, ebx // 8d1c39 | lea ebx, [ecx + edi] // 33c3 | xor eax, ebx $sequence_14 = { f3a4 8d4c245c 51 52 8d8c24c0000000 e8???????? 8bcb } // n = 7, score = 100 // f3a4 | rep movsb byte ptr es:[edi], byte ptr [esi] // 8d4c245c | lea ecx, [esp + 0x5c] // 51 | push ecx // 52 | push edx // 8d8c24c0000000 | lea ecx, [esp + 0xc0] // e8???????? | // 8bcb | mov ecx, ebx $sequence_15 = { 8b442410 c684240004000010 85c0 7577 } // n = 4, score = 100 // 8b442410 | mov eax, dword ptr [esp + 0x10] // c684240004000010 | mov byte ptr [esp + 0x400], 0x10 // 85c0 | test eax, eax // 7577 | jne 0x79 condition: 7 of them and filesize < 57344 }
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