Actor(s): Lazarus Group
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rule win_op_blockbuster_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.op_blockbuster." 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.op_blockbuster" 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 = { 6a00 e8???????? 85c0 7407 83f802 } // n = 5, score = 1100 // 6a00 | stosb byte ptr es:[edi], al // e8???????? | // 85c0 | pop edi // 7407 | test esi, esi // 83f802 | mov cl, byte ptr [eax] $sequence_1 = { c701???????? 8b497c 85c9 7407 } // n = 4, score = 1100 // c701???????? | // 8b497c | add eax, 0x21 // 85c9 | jmp 0xc // 7407 | push 0x4008 $sequence_2 = { e8???????? 6800400000 6a00 ff15???????? } // n = 4, score = 1100 // e8???????? | // 6800400000 | cmp al, 0x70 // 6a00 | jg 8 // ff15???????? | $sequence_3 = { ff15???????? 6808400000 6a40 ff15???????? } // n = 4, score = 1100 // ff15???????? | // 6808400000 | jg 8 // 6a40 | add al, 9 // ff15???????? | $sequence_4 = { 56 57 683c400000 6a40 } // n = 4, score = 1100 // 56 | add al, 9 // 57 | jmp 0xe // 683c400000 | cmp al, 0x72 // 6a40 | jl 0xa $sequence_5 = { 66ab aa 5f 85f6 } // n = 4, score = 1100 // 66ab | cmp al, 0x70 // aa | jg 8 // 5f | add al, 9 // 85f6 | cmp al, 0x70 $sequence_6 = { 8a08 80f920 7505 83c021 eb05 } // n = 5, score = 1100 // 8a08 | jg 6 // 80f920 | add al, 9 // 7505 | jmp 0xc // 83c021 | jl 0xa // eb05 | cmp al, 0x70 $sequence_7 = { 68???????? 56 ff15???????? 68???????? 56 a3???????? e8???????? } // n = 7, score = 1000 // 68???????? | // 56 | stosw word ptr es:[edi], ax // ff15???????? | // 68???????? | // 56 | stosb byte ptr es:[edi], al // a3???????? | // e8???????? | $sequence_8 = { 68???????? ff15???????? 85c0 7412 68???????? 50 e8???????? } // n = 7, score = 1000 // 68???????? | // ff15???????? | // 85c0 | pop edi // 7412 | test esi, esi // 68???????? | // 50 | pop esi // e8???????? | $sequence_9 = { 56 50 8d45fc 6a04 50 57 } // n = 6, score = 1000 // 56 | push esi // 50 | push edi // 8d45fc | push 0x403c // 6a04 | push 0x40 // 50 | push esi // 57 | push esi $sequence_10 = { 3c70 7f04 0409 eb06 3c72 } // n = 5, score = 500 // 3c70 | cmp al, 0x70 // 7f04 | jg 6 // 0409 | add al, 9 // eb06 | jmp 8 // 3c72 | cmp al, 0x72 $sequence_11 = { 3c69 7c08 3c70 7f04 } // n = 4, score = 500 // 3c69 | cmp al, 0x69 // 7c08 | jl 0xa // 3c70 | cmp al, 0x70 // 7f04 | jg 6 $sequence_12 = { 85c0 0f84bf000000 440fb7442430 488d942450010000 4c8bcf 488bcb } // n = 6, score = 300 // 85c0 | dec eax // 0f84bf000000 | mov dword ptr [esp + 0x48], eax // 440fb7442430 | dec esp // 488d942450010000 | mov dword ptr [esp + 0x40], esp // 4c8bcf | dec esp // 488bcb | mov dword ptr [esp + 0x38], esp $sequence_13 = { 8b442450 33db 48895c2430 89442428 } // n = 4, score = 300 // 8b442450 | inc esp // 33db | mov ebp, esi // 48895c2430 | mov edi, 2 // 89442428 | cmp esi, ecx $sequence_14 = { 4889442448 4c89642440 4c89642438 4489642430 4533c9 33d2 4489642428 } // n = 7, score = 300 // 4889442448 | inc esp // 4c89642440 | cmovg ebp, ecx // 4c89642438 | mov eax, dword ptr [esp + 0x50] // 4489642430 | xor ebx, ebx // 4533c9 | dec eax // 33d2 | mov dword ptr [esp + 0x30], ebx // 4489642428 | mov dword ptr [esp + 0x28], eax $sequence_15 = { a3???????? 5e c3 68???????? ff15???????? 85c0 } // n = 6, score = 300 // a3???????? | // 5e | push esi // c3 | push eax // 68???????? | // ff15???????? | // 85c0 | lea eax, [ebp - 4] $sequence_16 = { ff15???????? 4c8bf0 4885c0 0f84b9000000 4883c008 } // n = 5, score = 300 // ff15???????? | // 4c8bf0 | dec esp // 4885c0 | mov esi, eax // 0f84b9000000 | dec eax // 4883c008 | test eax, eax $sequence_17 = { 4883c008 b900400000 448bee bf02000000 3bf1 440f4fe9 } // n = 6, score = 300 // 4883c008 | je 0xbf // b900400000 | dec eax // 448bee | add eax, 8 // bf02000000 | dec eax // 3bf1 | add eax, 8 // 440f4fe9 | mov ecx, 0x4000 $sequence_18 = { 488bfa 4533c9 ba7a341200 4d8be8 4c8be1 e8???????? } // n = 6, score = 300 // 488bfa | inc esp // 4533c9 | mov dword ptr [esp + 0x30], esp // ba7a341200 | inc ebp // 4d8be8 | xor ecx, ecx // 4c8be1 | xor edx, edx // e8???????? | $sequence_19 = { 56 50 e8???????? ff75f4 e8???????? ff75ec e8???????? } // n = 7, score = 100 // 56 | lea eax, [ebp - 4] // 50 | push 4 // e8???????? | // ff75f4 | push eax // e8???????? | // ff75ec | push edi // e8???????? | $sequence_20 = { 53 68???????? ffd6 3bc3 7518 53 } // n = 6, score = 100 // 53 | push eax // 68???????? | // ffd6 | lea eax, [ebp - 4] // 3bc3 | push 4 // 7518 | push eax // 53 | push edi $sequence_21 = { 5e 5d c3 55 8bec 81ecec0d0000 53 } // n = 7, score = 100 // 5e | je 0x14 // 5d | push eax // c3 | pop esi // 55 | ret // 8bec | test eax, eax // 81ecec0d0000 | pop esi // 53 | ret condition: 7 of them and filesize < 74309632 }
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