Actor(s): APT5
There is no description at this point.
rule win_leouncia_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.leouncia." 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.leouncia" 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 = { 83c404 c1e018 0bc8 5f 5e } // n = 5, score = 100 // 83c404 | add esp, 4 // c1e018 | shl eax, 0x18 // 0bc8 | or ecx, eax // 5f | pop edi // 5e | pop esi $sequence_1 = { 8bbc2464040000 33ed 8d542410 895c2410 52 } // n = 5, score = 100 // 8bbc2464040000 | mov edi, dword ptr [esp + 0x464] // 33ed | xor ebp, ebp // 8d542410 | lea edx, [esp + 0x10] // 895c2410 | mov dword ptr [esp + 0x10], ebx // 52 | push edx $sequence_2 = { 0f8f97000000 56 57 8b7d0c 8b34bd24a74000 } // n = 5, score = 100 // 0f8f97000000 | jg 0x9d // 56 | push esi // 57 | push edi // 8b7d0c | mov edi, dword ptr [ebp + 0xc] // 8b34bd24a74000 | mov esi, dword ptr [edi*4 + 0x40a724] $sequence_3 = { 8b7d08 8d05d4ae4000 83780800 753b b0ff 8bff } // n = 6, score = 100 // 8b7d08 | mov edi, dword ptr [ebp + 8] // 8d05d4ae4000 | lea eax, [0x40aed4] // 83780800 | cmp dword ptr [eax + 8], 0 // 753b | jne 0x3d // b0ff | mov al, 0xff // 8bff | mov edi, edi $sequence_4 = { 56 53 8b750c 8b7d08 8d05d4ae4000 83780800 753b } // n = 7, score = 100 // 56 | push esi // 53 | push ebx // 8b750c | mov esi, dword ptr [ebp + 0xc] // 8b7d08 | mov edi, dword ptr [ebp + 8] // 8d05d4ae4000 | lea eax, [0x40aed4] // 83780800 | cmp dword ptr [eax + 8], 0 // 753b | jne 0x3d $sequence_5 = { 6a64 8bdf 2bde ff15???????? 3bfe } // n = 5, score = 100 // 6a64 | push 0x64 // 8bdf | mov ebx, edi // 2bde | sub ebx, esi // ff15???????? | // 3bfe | cmp edi, esi $sequence_6 = { 50 52 e8???????? 8b442420 83e810 89442420 c644046000 } // n = 7, score = 100 // 50 | push eax // 52 | push edx // e8???????? | // 8b442420 | mov eax, dword ptr [esp + 0x20] // 83e810 | sub eax, 0x10 // 89442420 | mov dword ptr [esp + 0x20], eax // c644046000 | mov byte ptr [esp + eax + 0x60], 0 $sequence_7 = { e8???????? 85c0 75d9 5b 85f6 } // n = 5, score = 100 // e8???????? | // 85c0 | test eax, eax // 75d9 | jne 0xffffffdb // 5b | pop ebx // 85f6 | test esi, esi $sequence_8 = { b949000000 8dbc2414010000 c784241001000000000000 50 6a02 f3ab } // n = 6, score = 100 // b949000000 | mov ecx, 0x49 // 8dbc2414010000 | lea edi, [esp + 0x114] // c784241001000000000000 | mov dword ptr [esp + 0x110], 0 // 50 | push eax // 6a02 | push 2 // f3ab | rep stosd dword ptr es:[edi], eax $sequence_9 = { 8db42430040000 8b0e 83c208 8908 8b4e04 894804 8a0d???????? } // n = 7, score = 100 // 8db42430040000 | lea esi, [esp + 0x430] // 8b0e | mov ecx, dword ptr [esi] // 83c208 | add edx, 8 // 8908 | mov dword ptr [eax], ecx // 8b4e04 | mov ecx, dword ptr [esi + 4] // 894804 | mov dword ptr [eax + 4], ecx // 8a0d???????? | condition: 7 of them and filesize < 114688 }
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