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rule win_alureon_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.alureon." 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.alureon" 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 = { 59 32c0 8d7c2420 f3aa 8b4d14 } // n = 5, score = 200 // 59 | pop ecx // 32c0 | xor al, al // 8d7c2420 | lea edi, [esp + 0x20] // f3aa | rep stosb byte ptr es:[edi], al // 8b4d14 | mov ecx, dword ptr [ebp + 0x14] $sequence_1 = { 3b442410 75cf 33c0 5f 5e 5b c20800 } // n = 7, score = 200 // 3b442410 | cmp eax, dword ptr [esp + 0x10] // 75cf | jne 0xffffffd1 // 33c0 | xor eax, eax // 5f | pop edi // 5e | pop esi // 5b | pop ebx // c20800 | ret 8 $sequence_2 = { 6800001000 8d45f8 50 c745d818000000 } // n = 4, score = 200 // 6800001000 | push 0x100000 // 8d45f8 | lea eax, [ebp - 8] // 50 | push eax // c745d818000000 | mov dword ptr [ebp - 0x28], 0x18 $sequence_3 = { 68000010c0 8d45fc 50 c745d818000000 } // n = 4, score = 200 // 68000010c0 | push 0xc0100000 // 8d45fc | lea eax, [ebp - 4] // 50 | push eax // c745d818000000 | mov dword ptr [ebp - 0x28], 0x18 $sequence_4 = { 6800000080 6a03 56 6a01 } // n = 4, score = 200 // 6800000080 | push 0x80000000 // 6a03 | push 3 // 56 | push esi // 6a01 | push 1 $sequence_5 = { 41 8bca 49 ffc7 } // n = 4, score = 200 // 41 | inc ecx // 8bca | mov ecx, edx // 49 | dec ecx // ffc7 | inc edi $sequence_6 = { 2bc8 03cf 8908 eb2f 837dfc05 751c } // n = 6, score = 200 // 2bc8 | sub ecx, eax // 03cf | add ecx, edi // 8908 | mov dword ptr [eax], ecx // eb2f | jmp 0x31 // 837dfc05 | cmp dword ptr [ebp - 4], 5 // 751c | jne 0x1e $sequence_7 = { 6800005600 8d45d0 50 53 } // n = 4, score = 200 // 6800005600 | push 0x560000 // 8d45d0 | lea eax, [ebp - 0x30] // 50 | push eax // 53 | push ebx $sequence_8 = { 53 ff15???????? 8945f8 56 } // n = 4, score = 100 // 53 | push ebx // ff15???????? | // 8945f8 | mov dword ptr [ebp - 8], eax // 56 | push esi $sequence_9 = { c745f000010000 749d ff75e8 ff15???????? } // n = 4, score = 100 // c745f000010000 | mov dword ptr [ebp - 0x10], 0x100 // 749d | je 0xffffff9f // ff75e8 | push dword ptr [ebp - 0x18] // ff15???????? | $sequence_10 = { 66a5 8d85a8feffff 50 68???????? a4 } // n = 5, score = 100 // 66a5 | movsw word ptr es:[edi], word ptr [esi] // 8d85a8feffff | lea eax, [ebp - 0x158] // 50 | push eax // 68???????? | // a4 | movsb byte ptr es:[edi], byte ptr [esi] $sequence_11 = { 741c 8d85e4fbffff 50 8d85f8feffff 50 } // n = 5, score = 100 // 741c | je 0x1e // 8d85e4fbffff | lea eax, [ebp - 0x41c] // 50 | push eax // 8d85f8feffff | lea eax, [ebp - 0x108] // 50 | push eax $sequence_12 = { 837dfc0a 7cc0 eb32 8bc3 } // n = 4, score = 100 // 837dfc0a | cmp dword ptr [ebp - 4], 0xa // 7cc0 | jl 0xffffffc2 // eb32 | jmp 0x34 // 8bc3 | mov eax, ebx $sequence_13 = { 50 33f6 46 56 8d8424cc000000 50 } // n = 6, score = 100 // 50 | push eax // 33f6 | xor esi, esi // 46 | inc esi // 56 | push esi // 8d8424cc000000 | lea eax, [esp + 0xcc] // 50 | push eax $sequence_14 = { 8d8424ec010000 50 68???????? ff15???????? 85c0 0f84f2020000 } // n = 6, score = 100 // 8d8424ec010000 | lea eax, [esp + 0x1ec] // 50 | push eax // 68???????? | // ff15???????? | // 85c0 | test eax, eax // 0f84f2020000 | je 0x2f8 $sequence_15 = { ff15???????? 85c0 7409 39b424c8000000 75cf 53 53 } // n = 7, score = 100 // ff15???????? | // 85c0 | test eax, eax // 7409 | je 0xb // 39b424c8000000 | cmp dword ptr [esp + 0xc8], esi // 75cf | jne 0xffffffd1 // 53 | push ebx // 53 | push ebx condition: 7 of them and filesize < 278528 }
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