Actor(s): Oktropys
Ransomware
rule win_aurora_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.aurora." 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.aurora" malpedia_rule_date = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { 8d8d70ffffff c745e40f000000 c745e000000000 c645d000 e8???????? c645fc04 } // n = 6, score = 300 // 8d8d70ffffff | lea ecx, [ebp - 0x90] // c745e40f000000 | mov dword ptr [ebp - 0x1c], 0xf // c745e000000000 | mov dword ptr [ebp - 0x20], 0 // c645d000 | mov byte ptr [ebp - 0x30], 0 // e8???????? | // c645fc04 | mov byte ptr [ebp - 4], 4 $sequence_1 = { 6a03 68???????? 8d8dbcefffff c785d0efffff0f000000 c785ccefffff00000000 } // n = 5, score = 300 // 6a03 | push 3 // 68???????? | // 8d8dbcefffff | lea ecx, [ebp - 0x1044] // c785d0efffff0f000000 | mov dword ptr [ebp - 0x1030], 0xf // c785ccefffff00000000 | mov dword ptr [ebp - 0x1034], 0 $sequence_2 = { 57 8b7a10 6a78 c746140f000000 c7461000000000 8975f8 } // n = 6, score = 300 // 57 | push edi // 8b7a10 | mov edi, dword ptr [edx + 0x10] // 6a78 | push 0x78 // c746140f000000 | mov dword ptr [esi + 0x14], 0xf // c7461000000000 | mov dword ptr [esi + 0x10], 0 // 8975f8 | mov dword ptr [ebp - 8], esi $sequence_3 = { 394db8 7612 0fb60419 41 33c7 69f893010001 } // n = 6, score = 300 // 394db8 | cmp dword ptr [ebp - 0x48], ecx // 7612 | jbe 0x14 // 0fb60419 | movzx eax, byte ptr [ecx + ebx] // 41 | inc ecx // 33c7 | xor eax, edi // 69f893010001 | imul edi, eax, 0x1000193 $sequence_4 = { 8d8d14efffff c78528efffff0f000000 c78524efffff00000000 c68514efffff00 e8???????? } // n = 5, score = 300 // 8d8d14efffff | lea ecx, [ebp - 0x10ec] // c78528efffff0f000000 | mov dword ptr [ebp - 0x10d8], 0xf // c78524efffff00000000 | mov dword ptr [ebp - 0x10dc], 0 // c68514efffff00 | mov byte ptr [ebp - 0x10ec], 0 // e8???????? | $sequence_5 = { 85ff 75da 837e1410 897e10 720d 8b06 } // n = 6, score = 300 // 85ff | test edi, edi // 75da | jne 0xffffffdc // 837e1410 | cmp dword ptr [esi + 0x14], 0x10 // 897e10 | mov dword ptr [esi + 0x10], edi // 720d | jb 0xf // 8b06 | mov eax, dword ptr [esi] $sequence_6 = { 7414 8d8d70ffffff e8???????? c645fc02 e9???????? 83ec0c } // n = 6, score = 300 // 7414 | je 0x16 // 8d8d70ffffff | lea ecx, [ebp - 0x90] // e8???????? | // c645fc02 | mov byte ptr [ebp - 4], 2 // e9???????? | // 83ec0c | sub esp, 0xc $sequence_7 = { 0f8483000000 c1e706 03f8 83c106 894ddc 7869 8bc7 } // n = 7, score = 300 // 0f8483000000 | je 0x89 // c1e706 | shl edi, 6 // 03f8 | add edi, eax // 83c106 | add ecx, 6 // 894ddc | mov dword ptr [ebp - 0x24], ecx // 7869 | js 0x6b // 8bc7 | mov eax, edi $sequence_8 = { 8d4dbc e8???????? 83c418 8bd8 c645fc01 b801000000 8b35???????? } // n = 7, score = 300 // 8d4dbc | lea ecx, [ebp - 0x44] // e8???????? | // 83c418 | add esp, 0x18 // 8bd8 | mov ebx, eax // c645fc01 | mov byte ptr [ebp - 4], 1 // b801000000 | mov eax, 1 // 8b35???????? | $sequence_9 = { 6a02 68???????? 8d8d14efffff c78528efffff0f000000 } // n = 4, score = 300 // 6a02 | push 2 // 68???????? | // 8d8d14efffff | lea ecx, [ebp - 0x10ec] // c78528efffff0f000000 | mov dword ptr [ebp - 0x10d8], 0xf condition: 7 of them and filesize < 827392 }
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