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rule win_astralocker_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" 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 = "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 = { 33f6 89040a 89740a04 c745fc00000000 eb09 8b4dfc } // n = 6, score = 500 // 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 // 8b4dfc | mov ecx, dword ptr [ebp - 4] $sequence_1 = { 89740104 b808000000 6bc800 8b5508 8b440a04 } // n = 5, score = 500 // 89740104 | mov dword ptr [ecx + eax + 4], esi // b808000000 | mov eax, 8 // 6bc800 | imul ecx, eax, 0 // 8b5508 | mov edx, dword ptr [ebp + 8] // 8b440a04 | mov eax, dword ptr [edx + ecx + 4] $sequence_2 = { 8b440a04 50 8b0c0a 51 e8???????? } // n = 5, score = 500 // 8b440a04 | mov eax, dword ptr [edx + ecx + 4] // 50 | push eax // 8b0c0a | mov ecx, dword ptr [edx + ecx] // 51 | push ecx // e8???????? | $sequence_3 = { 50 8b0c0a 51 e8???????? 83c408 } // n = 5, score = 500 // 50 | push eax // 8b0c0a | mov ecx, dword ptr [edx + ecx] // 51 | push ecx // e8???????? | // 83c408 | add esp, 8 $sequence_4 = { 89441104 ba08000000 6bc20a 8b4d08 33d2 33f6 891401 } // n = 7, score = 500 // 89441104 | mov dword ptr [ecx + edx + 4], eax // 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 $sequence_5 = { 33c0 33f6 89040a 89740a04 c745fc00000000 eb09 8b4dfc } // n = 7, 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 // 8b4dfc | mov ecx, dword ptr [ebp - 4] $sequence_6 = { 89740104 b808000000 6bc800 8b5508 8b440a04 50 } // n = 6, score = 500 // 89740104 | mov dword ptr [ecx + eax + 4], esi // b808000000 | mov eax, 8 // 6bc800 | imul ecx, eax, 0 // 8b5508 | mov edx, dword ptr [ebp + 8] // 8b440a04 | mov eax, dword ptr [edx + ecx + 4] // 50 | push eax $sequence_7 = { 89740104 b808000000 6bc800 8b5508 } // n = 4, score = 500 // 89740104 | mov dword ptr [ecx + eax + 4], esi // b808000000 | mov eax, 8 // 6bc800 | imul ecx, eax, 0 // 8b5508 | mov edx, dword ptr [ebp + 8] $sequence_8 = { 0f83dc000000 8b55fc 8b4508 8b4cd004 } // n = 4, score = 500 // 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_9 = { 33f6 891401 89740104 b808000000 6bc800 8b5508 } // n = 6, score = 500 // 33f6 | xor esi, esi // 891401 | mov dword ptr [ecx + eax], edx // 89740104 | mov dword ptr [ecx + eax + 4], esi // b808000000 | mov eax, 8 // 6bc800 | imul ecx, eax, 0 // 8b5508 | mov edx, dword ptr [ebp + 8] condition: 7 of them and filesize < 191488 }
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