Actor(s): Lazarus Group
There is no description at this point.
rule win_dyepack_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "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 = { 7f08 8b4c2410 3be9 72ac } // n = 4, score = 300 // 7f08 | jg 0xa // 8b4c2410 | mov ecx, dword ptr [esp + 0x10] // 3be9 | cmp ebp, ecx // 72ac | jb 0xffffffae $sequence_1 = { 3be9 72ac 56 ff15???????? 56 ff15???????? 8b8c2428100000 } // n = 7, score = 300 // 3be9 | cmp ebp, ecx // 72ac | jb 0xffffffae // 56 | push esi // ff15???????? | // 56 | push esi // ff15???????? | // 8b8c2428100000 | mov ecx, dword ptr [esp + 0x1028] $sequence_2 = { 53 56 ffd7 8b442414 8b4c2410 33ed 33ff } // n = 7, score = 300 // 53 | push ebx // 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 $sequence_3 = { 72ac 56 ff15???????? 56 } // n = 4, score = 300 // 72ac | jb 0xffffffae // 56 | push esi // ff15???????? | // 56 | push esi $sequence_4 = { 3bcb 765a eb04 8b4c2410 2bcd } // n = 5, score = 300 // 3bcb | cmp ecx, ebx // 765a | jbe 0x5c // eb04 | jmp 6 // 8b4c2410 | mov ecx, dword ptr [esp + 0x10] // 2bcd | sub ecx, ebp $sequence_5 = { 7815 7f08 81f900100000 760b b900100000 895c2420 eb04 } // n = 7, score = 300 // 7815 | js 0x17 // 7f08 | jg 0xa // 81f900100000 | cmp ecx, 0x1000 // 760b | jbe 0xd // b900100000 | mov ecx, 0x1000 // 895c2420 | mov dword ptr [esp + 0x20], ebx // eb04 | jmp 6 $sequence_6 = { 56 ff15???????? 8d442410 895c2410 50 56 } // n = 6, score = 300 // 56 | push esi // ff15???????? | // 8d442410 | lea eax, [esp + 0x10] // 895c2410 | mov dword ptr [esp + 0x10], ebx // 50 | push eax // 56 | push esi $sequence_7 = { ff15???????? 85c0 741e 8b442418 3bc3 7416 } // n = 6, score = 300 // ff15???????? | // 85c0 | test eax, eax // 741e | je 0x20 // 8b442418 | mov eax, dword ptr [esp + 0x18] // 3bc3 | cmp eax, ebx // 7416 | je 0x18 $sequence_8 = { 8b842434100000 53 6800000040 50 ff15???????? 8bf0 } // n = 6, score = 300 // 8b842434100000 | mov eax, dword ptr [esp + 0x1034] // 53 | push ebx // 6800000040 | push 0x40000000 // 50 | push eax // ff15???????? | // 8bf0 | mov esi, eax $sequence_9 = { 6a03 53 aa 8b842434100000 53 } // n = 5, score = 300 // 6a03 | push 3 // 53 | push ebx // aa | stosb byte ptr es:[edi], al // 8b842434100000 | mov eax, dword ptr [esp + 0x1034] // 53 | push ebx condition: 7 of them and filesize < 212992 }
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