Actor(s): Oktropys
Ransomware
rule win_aurora_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "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 = { 8bda 8bf9 897dec c745f000000000 c7471000000000 c7471400000000 } // n = 6, score = 300 // 8bda | mov ebx, edx // 8bf9 | mov edi, ecx // 897dec | mov dword ptr [ebp - 0x14], edi // c745f000000000 | mov dword ptr [ebp - 0x10], 0 // c7471000000000 | mov dword ptr [edi + 0x10], 0 // c7471400000000 | mov dword ptr [edi + 0x14], 0 $sequence_1 = { 8b9df0feffff c745e40f000000 c745e000000000 c645d000 803b00 } // n = 5, score = 300 // 8b9df0feffff | mov ebx, dword ptr [ebp - 0x110] // c745e40f000000 | mov dword ptr [ebp - 0x1c], 0xf // c745e000000000 | mov dword ptr [ebp - 0x20], 0 // c645d000 | mov byte ptr [ebp - 0x30], 0 // 803b00 | cmp byte ptr [ebx], 0 $sequence_2 = { 6a00 50 8bf2 e8???????? 68???????? } // n = 5, score = 300 // 6a00 | push 0 // 50 | push eax // 8bf2 | mov esi, edx // e8???????? | // 68???????? | $sequence_3 = { 8bcf 803c113d 0f84da000000 83f810 7204 8b07 eb02 } // n = 7, score = 300 // 8bcf | mov ecx, edi // 803c113d | cmp byte ptr [ecx + edx], 0x3d // 0f84da000000 | je 0xe0 // 83f810 | cmp eax, 0x10 // 7204 | jb 6 // 8b07 | mov eax, dword ptr [edi] // eb02 | jmp 4 $sequence_4 = { 68???????? c745fc00000000 e8???????? 8bd0 c745d407000000 } // n = 5, score = 300 // 68???????? | // c745fc00000000 | mov dword ptr [ebp - 4], 0 // e8???????? | // 8bd0 | mov edx, eax // c745d407000000 | mov dword ptr [ebp - 0x2c], 7 $sequence_5 = { 7412 90 0fb60439 41 } // n = 4, score = 300 // 7412 | je 0x14 // 90 | nop // 0fb60439 | movzx eax, byte ptr [ecx + edi] // 41 | inc ecx $sequence_6 = { 64a300000000 8bfa 897db8 8bf1 8975c8 8975c0 } // n = 6, score = 300 // 64a300000000 | mov dword ptr fs:[0], eax // 8bfa | mov edi, edx // 897db8 | mov dword ptr [ebp - 0x48], edi // 8bf1 | mov esi, ecx // 8975c8 | mov dword ptr [ebp - 0x38], esi // 8975c0 | mov dword ptr [ebp - 0x40], esi $sequence_7 = { 8b09 2bc2 33d2 03c7 f7f7 8b7df8 8a043a } // n = 7, score = 300 // 8b09 | mov ecx, dword ptr [ecx] // 2bc2 | sub eax, edx // 33d2 | xor edx, edx // 03c7 | add eax, edi // f7f7 | div edi // 8b7df8 | mov edi, dword ptr [ebp - 8] // 8a043a | mov al, byte ptr [edx + edi] $sequence_8 = { 68???????? 8d8d24f1ffff c78538f1ffff0f000000 c78534f1ffff00000000 } // n = 4, score = 300 // 68???????? | // 8d8d24f1ffff | lea ecx, [ebp - 0xedc] // c78538f1ffff0f000000 | mov dword ptr [ebp - 0xec8], 0xf // c78534f1ffff00000000 | mov dword ptr [ebp - 0xecc], 0 $sequence_9 = { 8bce e8???????? 8b45bc 83f810 7242 8b4da8 } // n = 6, score = 300 // 8bce | mov ecx, esi // e8???????? | // 8b45bc | mov eax, dword ptr [ebp - 0x44] // 83f810 | cmp eax, 0x10 // 7242 | jb 0x44 // 8b4da8 | mov ecx, dword ptr [ebp - 0x58] condition: 7 of them and filesize < 827392 }
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