Actor(s): Lazarus Group
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rule win_dyepack_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.dyepack." 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.dyepack" 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 = { 8b442414 13fb 3bf8 7cb2 7f08 } // n = 5, score = 300 // 8b442414 | mov eax, dword ptr [esp + 0x14] // 13fb | adc edi, ebx // 3bf8 | cmp edi, eax // 7cb2 | jl 0xffffffb4 // 7f08 | jg 0xa $sequence_1 = { 83feff 7510 ff15???????? 5f 5e 5b 81c414100000 } // n = 7, score = 300 // 83feff | cmp esi, -1 // 7510 | jne 0x12 // ff15???????? | // 5f | pop edi // 5e | pop esi // 5b | pop ebx // 81c414100000 | add esp, 0x1014 $sequence_2 = { ff15???????? 56 ff15???????? 8b8c2428100000 53 } // n = 5, score = 300 // ff15???????? | // 56 | push esi // ff15???????? | // 8b8c2428100000 | mov ecx, dword ptr [esp + 0x1028] // 53 | push ebx $sequence_3 = { 8b442414 13fb 3bf8 7cb2 7f08 8b4c2410 3be9 } // n = 7, score = 300 // 8b442414 | mov eax, dword ptr [esp + 0x14] // 13fb | adc edi, ebx // 3bf8 | cmp edi, eax // 7cb2 | jl 0xffffffb4 // 7f08 | jg 0xa // 8b4c2410 | mov ecx, dword ptr [esp + 0x10] // 3be9 | cmp ebp, ecx $sequence_4 = { 8d542418 53 52 8d44242c 51 } // n = 5, score = 300 // 8d542418 | lea edx, [esp + 0x18] // 53 | push ebx // 52 | push edx // 8d44242c | lea eax, [esp + 0x2c] // 51 | push ecx $sequence_5 = { 56 ffd7 8b442414 8b4c2410 33ed 33ff 3bc3 } // n = 7, score = 300 // 56 | push esi // ffd7 | call edi // 8b442414 | mov eax, dword ptr [esp + 0x14] // 8b4c2410 | mov ecx, dword ptr [esp + 0x10] // 33ed | xor ebp, ebp // 33ff | xor edi, edi // 3bc3 | cmp eax, ebx $sequence_6 = { 53 6880000000 6a03 53 aa 8b842434100000 } // n = 6, score = 300 // 53 | push ebx // 6880000000 | push 0x80 // 6a03 | push 3 // 53 | push ebx // aa | stosb byte ptr es:[edi], al // 8b842434100000 | mov eax, dword ptr [esp + 0x1034] $sequence_7 = { 53 51 8d54242c 6a01 52 56 ff15???????? } // n = 7, score = 300 // 53 | push ebx // 51 | push ecx // 8d54242c | lea edx, [esp + 0x2c] // 6a01 | push 1 // 52 | push edx // 56 | push esi // ff15???????? | $sequence_8 = { 56 57 33db b9ff030000 33c0 8d7c2421 885c2420 } // n = 7, score = 300 // 56 | push esi // 57 | push edi // 33db | xor ebx, ebx // b9ff030000 | mov ecx, 0x3ff // 33c0 | xor eax, eax // 8d7c2421 | lea edi, [esp + 0x21] // 885c2420 | mov byte ptr [esp + 0x20], bl $sequence_9 = { 56 ff15???????? 56 ff15???????? 8b8c2428100000 } // n = 5, score = 300 // 56 | push esi // ff15???????? | // 56 | push esi // ff15???????? | // 8b8c2428100000 | mov ecx, dword ptr [esp + 0x1028] condition: 7 of them and filesize < 212992 }
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