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rule win_phoenix_locker_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.phoenix_locker." 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.phoenix_locker" malpedia_rule_date = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { 488bcf e9???????? 66448938 e8???????? 8bd8 f9 } // n = 6, score = 200 // 488bcf | dec esp // e9???????? | // 66448938 | mov ecx, ebp // e8???????? | // 8bd8 | inc esp // f9 | movsx eax, di $sequence_1 = { 66440fa4c8a4 488b01 4533c9 458bc7 ff5020 488d5f02 493bfe } // n = 7, score = 200 // 66440fa4c8a4 | mov ecx, dword ptr [eax + 0x50] // 488b01 | inc esp // 4533c9 | test al, dl // 458bc7 | dec eax // ff5020 | mov eax, dword ptr [esp + 0x40] // 488d5f02 | dec eax // 493bfe | cwde $sequence_2 = { 450fbfc5 488d4c2460 480fb7d2 448d866e03a3ea 99 } // n = 5, score = 200 // 450fbfc5 | dec eax // 488d4c2460 | movsx ecx, bp // 480fb7d2 | dec ebp // 448d866e03a3ea | movzx ecx, dx // 99 | inc ecx $sequence_3 = { f5 488d0c4e 40f6c464 e9???????? 4d03c0 e9???????? } // n = 6, score = 200 // f5 | and al, 0x7b // 488d0c4e | mov edi, 8 // 40f6c464 | inc ecx // e9???????? | // 4d03c0 | rcr ch, 0x1b // e9???????? | $sequence_4 = { e9???????? e8???????? 488b2d83cfe4ff 6685f0 493bc6 2bd2 f5 } // n = 7, score = 200 // e9???????? | // e8???????? | // 488b2d83cfe4ff | dec ecx // 6685f0 | mov esi, dword ptr [ebx + 0x18] // 493bc6 | inc eax // 2bd2 | not bh // f5 | inc ecx $sequence_5 = { e8???????? d15301 1006 0010 640900 103406 0010 } // n = 7, score = 200 // e8???????? | // d15301 | inc ecx // 1006 | pop esp // 0010 | pop edi // 640900 | pop edi // 103406 | dec eax // 0010 | lea esp, [esp + 8] $sequence_6 = { 0f8441010000 418bbf84000000 41c0f875 40f6c621 458b8788000000 413bfb e9???????? } // n = 7, score = 200 // 0f8441010000 | push 0x6798296c // 418bbf84000000 | inc ecx // 41c0f875 | push ebx // 40f6c621 | sar word ptr [esp + 0x20], 1 // 458b8788000000 | cmc // 413bfb | dec esp // e9???????? | $sequence_7 = { 4885c9 450fc0d2 312c24 4512d0 664181f26070 } // n = 5, score = 200 // 4885c9 | add esp, dword ptr [ebx - 0x145f1a25] // 450fc0d2 | and bh, byte ptr [edi + 0x36] // 312c24 | dec esi // 4512d0 | add byte ptr [eax], al // 664181f26070 | add bl, ah $sequence_8 = { 4151 410fbaf9cc 66440f42cb 4180f130 312c24 664533cd 440bcb } // n = 7, score = 200 // 4151 | fstp dword ptr [ebx] // 410fbaf9cc | mov al, 0x70 // 66440f42cb | fidiv word ptr [eax + 0x5aade0c5] // 4180f130 | jnp 0xffffffcd // 312c24 | add cl, bl // 664533cd | jb 0x16 // 440bcb | cvtps2pd xmm7, xmm4 $sequence_9 = { e8???????? 4155 4151 9c 49b98059c32d64378851 e8???????? 4c0fbbea } // n = 7, score = 200 // e8???????? | // 4155 | pop ecx // 4151 | pop ecx // 9c | pop edi // 49b98059c32d64378851 | pop edi // e8???????? | // 4c0fbbea | ret condition: 7 of them and filesize < 3702784 }
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