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rule win_phoenix_locker_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "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 = { 4d8943c0 f9 452bc9 41f6c307 33d2 f8 452bc0 } // n = 7, score = 200 // 4d8943c0 | cmovl eax, edx // f9 | inc ebp // 452bc9 | mov eax, edi // 41f6c307 | call dword ptr [eax + 0x20] // 33d2 | dec eax // f8 | mov ecx, dword ptr [esp + 0x28] // 452bc0 | inc cx $sequence_1 = { 493bc7 e9???????? 0f8422020000 4c8bc3 660fbae1c9 d3e9 2bd2 } // n = 7, score = 200 // 493bc7 | sbb ecx, 0x42e60787 // e9???????? | // 0f8422020000 | dec eax // 4c8bc3 | mov dword ptr [esp + 0x28], eax // 660fbae1c9 | inc ecx // d3e9 | lea edx, [esi - 0x155cfd4a] // 2bd2 | dec eax $sequence_2 = { 23cd 4433c1 46330493 66410fb6ca 49ffc2 453341d0 408ace } // n = 7, score = 200 // 23cd | movsd dword ptr es:[edi], dword ptr [esi] // 4433c1 | neg word ptr [esp + 8] // 46330493 | dec eax // 66410fb6ca | lea esp, [esp + 0x18] // 49ffc2 | popfd // 453341d0 | rol dword ptr [eax + 4], cl // 408ace | push 0x3db10401 $sequence_3 = { 488d642410 9d e8???????? 72b7 28ce e659 } // n = 6, score = 200 // 488d642410 | pop ebx // 9d | inc ecx // e8???????? | // 72b7 | pop ebp // 28ce | inc ecx // e659 | pop ebx $sequence_4 = { 4533c9 e8???????? 488b7c2440 4c8d4668 413bc7 488bd5 b9fcf772cf } // n = 7, score = 200 // 4533c9 | inc ecx // e8???????? | // 488b7c2440 | test bl, 0xa2 // 4c8d4668 | cmp ecx, 0x38 // 413bc7 | setns cl // 488bd5 | dec eax // b9fcf772cf | lea ecx, [esp + 0x20] $sequence_5 = { 41a5 ec b5a5 4168110a73be f1 b85c62bee8 c19d84414078e7 } // n = 7, score = 200 // 41a5 | inc esp // ec | movsx eax, bp // b5a5 | je 0x26c // 4168110a73be | mov eax, esi // f1 | dec ecx // b85c62bee8 | arpl bp, dx // c19d84414078e7 | dec eax $sequence_6 = { 55 77be e4ed de9741940cd5 8b4157 6f } // n = 6, score = 200 // 55 | not esp // 77be | inc bp // e4ed | movzx esp, cl // de9741940cd5 | inc ecx // 8b4157 | setae ah // 6f | inc ecx $sequence_7 = { e9???????? bb08000000 6681d10112 66d3e1 4d0fbfc4 488b0de3e5e4ff 41d2e8 } // n = 7, score = 200 // e9???????? | // bb08000000 | inc ebp // 6681d10112 | movzx ecx, bx // 66d3e1 | inc sp // 4d0fbfc4 | movsx ecx, ch // 488b0de3e5e4ff | inc ecx // 41d2e8 | mov ecx, 0xffffffff $sequence_8 = { 66c78424080000004377 6681a42408000000320c 4155 0f86dbffffff 68ff5b1158 66819c24180000006453 415d } // n = 7, score = 200 // 66c78424080000004377 | mov edx, esp // 6681a42408000000320c | dec eax // 4155 | mov ecx, 0x100 // 0f86dbffffff | add byte ptr [eax], al // 68ff5b1158 | add byte ptr [eax], al // 66819c24180000006453 | inc esp // 415d | xchg bh, cl $sequence_9 = { 49c1ffe0 68a700674d 490fbae768 f9 664281bc7c16256793563e 41c1e7a7 } // n = 6, score = 200 // 49c1ffe0 | xor ecx, eax // 68a700674d | inc ecx // 490fbae768 | mov dword ptr [ecx + 0x14], eax // f9 | sal eax, 0x5a // 664281bc7c16256793563e | inc ecx // 41c1e7a7 | mov dword ptr [ecx + 0x18], ecx condition: 7 of them and filesize < 3702784 }
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