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rule win_astralocker_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.astralocker." 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.astralocker" 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 = { 8b5508 8b440a04 50 8b0c0a 51 e8???????? } // n = 6, score = 500 // 8b5508 | mov edx, dword ptr [ebp + 8] // 8b440a04 | mov eax, dword ptr [edx + ecx + 4] // 50 | push eax // 8b0c0a | mov ecx, dword ptr [edx + ecx] // 51 | push ecx // e8???????? | $sequence_1 = { 83c102 894dfc 837dfc0a 0f83dc000000 8b55fc 8b4508 } // n = 6, score = 500 // 83c102 | add ecx, 2 // 894dfc | mov dword ptr [ebp - 4], ecx // 837dfc0a | cmp dword ptr [ebp - 4], 0xa // 0f83dc000000 | jae 0xe2 // 8b55fc | mov edx, dword ptr [ebp - 4] // 8b4508 | mov eax, dword ptr [ebp + 8] $sequence_2 = { 6bc20a 8b4d08 33d2 33f6 891401 } // n = 5, score = 500 // 6bc20a | imul eax, edx, 0xa // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 33d2 | xor edx, edx // 33f6 | xor esi, esi // 891401 | mov dword ptr [ecx + eax], edx $sequence_3 = { 6bc20a 8b4d08 33d2 33f6 } // n = 4, score = 500 // 6bc20a | imul eax, edx, 0xa // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 33d2 | xor edx, edx // 33f6 | xor esi, esi $sequence_4 = { 8b440a04 50 8b0c0a 51 e8???????? 83c408 8945ec } // n = 7, score = 500 // 8b440a04 | mov eax, dword ptr [edx + ecx + 4] // 50 | push eax // 8b0c0a | mov ecx, dword ptr [edx + ecx] // 51 | push ecx // e8???????? | // 83c408 | add esp, 8 // 8945ec | mov dword ptr [ebp - 0x14], eax $sequence_5 = { 894dfc 837dfc0a 0f83dc000000 8b55fc 8b4508 8b4cd004 } // n = 6, score = 500 // 894dfc | mov dword ptr [ebp - 4], ecx // 837dfc0a | cmp dword ptr [ebp - 4], 0xa // 0f83dc000000 | jae 0xe2 // 8b55fc | mov edx, dword ptr [ebp - 4] // 8b4508 | mov eax, dword ptr [ebp + 8] // 8b4cd004 | mov ecx, dword ptr [eax + edx*8 + 4] $sequence_6 = { 8b4508 8b4cd004 51 8b14d0 52 e8???????? } // n = 6, score = 500 // 8b4508 | mov eax, dword ptr [ebp + 8] // 8b4cd004 | mov ecx, dword ptr [eax + edx*8 + 4] // 51 | push ecx // 8b14d0 | mov edx, dword ptr [eax + edx*8] // 52 | push edx // e8???????? | $sequence_7 = { 33c0 33f6 89040a 89740a04 } // n = 4, score = 500 // 33c0 | xor eax, eax // 33f6 | xor esi, esi // 89040a | mov dword ptr [edx + ecx], eax // 89740a04 | mov dword ptr [edx + ecx + 4], esi $sequence_8 = { ba08000000 6bc20a 8b4d08 33d2 33f6 891401 89740104 } // n = 7, score = 500 // ba08000000 | mov edx, 8 // 6bc20a | imul eax, edx, 0xa // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 33d2 | xor edx, edx // 33f6 | xor esi, esi // 891401 | mov dword ptr [ecx + eax], edx // 89740104 | mov dword ptr [ecx + eax + 4], esi $sequence_9 = { 33c0 33f6 89040a 89740a04 c745fc00000000 eb09 } // n = 6, score = 500 // 33c0 | xor eax, eax // 33f6 | xor esi, esi // 89040a | mov dword ptr [edx + ecx], eax // 89740a04 | mov dword ptr [edx + ecx + 4], esi // c745fc00000000 | mov dword ptr [ebp - 4], 0 // eb09 | jmp 0xb condition: 7 of them and filesize < 191488 }
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