Actor(s): Lazarus Group
There is no description at this point.
rule win_op_blockbuster_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" 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 = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = 800 // 6a00 | stosw word ptr es:[edi], ax // e8???????? | // 85c0 | stosb byte ptr es:[edi], al // 7407 | pop edi // 83f802 | test esi, esi $sequence_1 = { f3ab 66ab aa 5f 85f6 } // n = 5, score = 800 // f3ab | mov ecx, edi // 66ab | cmp ebx, 1 // aa | jne 0x26 // 5f | dec eax // 85f6 | lea edx, [esp + 0x190] $sequence_2 = { ff15???????? 6808400000 6a40 ff15???????? } // n = 4, score = 800 // ff15???????? | // 6808400000 | lea ecx, [ebp + 0x2d0] // 6a40 | test eax, eax // ff15???????? | $sequence_3 = { 56 57 683c400000 6a40 } // n = 4, score = 800 // 56 | pop esi // 57 | stosw word ptr es:[edi], ax // 683c400000 | stosb byte ptr es:[edi], al // 6a40 | pop edi $sequence_4 = { e8???????? 6800400000 6a00 ff15???????? } // n = 4, score = 800 // e8???????? | // 6800400000 | mov ecx, ebp // 6a00 | test eax, eax // ff15???????? | $sequence_5 = { c701???????? 8b497c 85c9 7407 51 } // n = 5, score = 800 // c701???????? | // 8b497c | mov ecx, esi // 85c9 | inc ecx // 7407 | mov eax, 4 // 51 | dec eax $sequence_6 = { 8a08 80f920 7505 83c021 eb05 } // n = 5, score = 800 // 8a08 | stosb byte ptr es:[edi], al // 80f920 | pop edi // 7505 | test esi, esi // 83c021 | mov ecx, dword ptr [ecx + 0x7c] // eb05 | test ecx, ecx $sequence_7 = { 68???????? 56 ff15???????? 68???????? 56 a3???????? e8???????? } // n = 7, score = 700 // 68???????? | // 56 | pop esi // ff15???????? | // 68???????? | // 56 | push esi // a3???????? | // e8???????? | $sequence_8 = { 56 50 8d45fc 6a04 50 } // n = 5, score = 700 // 56 | jmp 0xe // 50 | cmp al, 0x72 // 8d45fc | cmp al, 0x69 // 6a04 | jl 0xa // 50 | cmp al, 0x70 $sequence_9 = { 7412 68???????? 50 e8???????? 59 a3???????? 59 } // n = 7, score = 700 // 7412 | jl 0xa // 68???????? | // 50 | cmp al, 0x70 // e8???????? | // 59 | jg 8 // a3???????? | // 59 | add al, 9 $sequence_10 = { 3c70 7f04 0409 eb06 } // n = 4, score = 500 // 3c70 | cmp al, 0x70 // 7f04 | jg 6 // 0409 | add al, 9 // eb06 | jmp 8 $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 = { 488b05???????? 4833c4 48898424d0030000 33c0 488be9 } // n = 5, score = 300 // 488b05???????? | // 4833c4 | sub ebp, edx // 48898424d0030000 | inc ebp // 33c0 | test ebp, ebp // 488be9 | dec eax $sequence_13 = { c3 56 53 6a01 57 e8???????? } // n = 6, score = 300 // c3 | push ebx // 56 | xor ebx, ebx // 53 | push esi // 6a01 | push edi // 57 | jne 0x4b // e8???????? | $sequence_14 = { 56 6a00 ff15???????? 8bf8 85ff 7504 5f } // n = 7, score = 300 // 56 | jmp 0xfffffffc // 6a00 | push ebx // ff15???????? | // 8bf8 | xor ebx, ebx // 85ff | push esi // 7504 | push edi // 5f | mov eax, esi $sequence_15 = { 8bc6 5f 5e c3 33c0 6a00 } // n = 6, score = 300 // 8bc6 | test esi, esi // 5f | pop esi // 5e | push edi // c3 | push 0x403c // 33c0 | push 0x40 // 6a00 | push 0 $sequence_16 = { 33c0 ebac 498bcc ff15???????? 488d4d70 } // n = 5, score = 300 // 33c0 | xor eax, esp // ebac | dec eax // 498bcc | mov dword ptr [esp + 0x3d0], eax // ff15???????? | // 488d4d70 | xor eax, eax $sequence_17 = { ff15???????? 85f6 7404 85c0 } // n = 4, score = 300 // ff15???????? | // 85f6 | push edi // 7404 | push esi // 85c0 | add esp, 0x14 $sequence_18 = { 57 e8???????? 56 e8???????? 83c414 b801000000 } // n = 6, score = 300 // 57 | xor ebx, ebx // e8???????? | // 56 | push esi // e8???????? | // 83c414 | push edi // b801000000 | mov eax, esi $sequence_19 = { 68???????? 56 e8???????? 56 e8???????? 83c438 } // n = 6, score = 300 // 68???????? | // 56 | push 0 // e8???????? | // 56 | mov edi, eax // e8???????? | // 83c438 | test edi, edi $sequence_20 = { 0f84df010000 8b542444 488bcf 442bea 4585ed } // n = 5, score = 300 // 0f84df010000 | je 0x1e5 // 8b542444 | mov edx, dword ptr [esp + 0x44] // 488bcf | dec eax // 442bea | mov ecx, edi // 4585ed | inc esp $sequence_21 = { ff15???????? 85c0 0f84e7010000 488d558c 488d8dd0020000 ff15???????? } // n = 6, score = 300 // ff15???????? | // 85c0 | dec eax // 0f84e7010000 | mov ebp, ecx // 488d558c | xor eax, eax // 488d8dd0020000 | jmp 0xffffffae // ff15???????? | $sequence_22 = { c3 33c0 ebf8 53 33db 391d???????? 56 } // n = 7, score = 300 // c3 | push esi // 33c0 | push esi // ebf8 | add esp, 0x40 // 53 | stosw word ptr es:[edi], ax // 33db | stosb byte ptr es:[edi], al // 391d???????? | // 56 | pop edi $sequence_23 = { a3???????? 5e c3 68???????? ff15???????? 85c0 } // n = 6, score = 300 // a3???????? | // 5e | je 0x16 // c3 | push eax // 68???????? | // ff15???????? | // 85c0 | pop ecx $sequence_24 = { e8???????? 85c0 7429 488d542468 4c8bce 41b804000000 488bcf } // n = 7, score = 300 // e8???????? | // 85c0 | dec ecx // 7429 | mov ecx, esp // 488d542468 | dec eax // 4c8bce | lea ecx, [ebp + 0x70] // 41b804000000 | test eax, eax // 488bcf | je 0x1ed $sequence_25 = { 83fb01 7524 488d942490010000 4d8bc4 488bcd } // n = 5, score = 300 // 83fb01 | dec eax // 7524 | lea edx, [ebp - 0x74] // 488d942490010000 | dec eax // 4d8bc4 | lea ecx, [ebp + 0x2d0] // 488bcd | test eax, eax $sequence_26 = { 8b86d8974400 85c0 740e 50 e8???????? } // n = 5, score = 200 // 8b86d8974400 | push 0 // 85c0 | mov edi, eax // 740e | test edi, edi // 50 | jne 0xc // e8???????? | $sequence_27 = { 83e03f 6bc830 8b0495d8974400 f644082801 7421 57 e8???????? } // n = 7, score = 200 // 83e03f | pop edi // 6bc830 | push edi // 8b0495d8974400 | push esi // f644082801 | add esp, 0x14 // 7421 | mov eax, 1 // 57 | test esi, esi // e8???????? | $sequence_28 = { c1fa06 8bc6 83e03f 6bc830 8b0495d8974400 885c0128 8b0495d8974400 } // n = 7, score = 200 // c1fa06 | je 6 // 8bc6 | test eax, eax // 83e03f | push esi // 6bc830 | push 0 // 8b0495d8974400 | mov edi, eax // 885c0128 | test edi, edi // 8b0495d8974400 | jne 0xc $sequence_29 = { 81ec54080000 56 57 33f6 b9ff010000 33c0 8dbdaef7ffff } // n = 7, score = 100 // 81ec54080000 | push edi // 56 | push esi // 57 | push eax // 33f6 | lea eax, [ebp - 4] // b9ff010000 | push 4 // 33c0 | push eax // 8dbdaef7ffff | push edi $sequence_30 = { f3ab 8bca 83e103 f3aa 8b4df8 } // n = 5, score = 100 // f3ab | push eax // 8bca | lea eax, [ebp - 4] // 83e103 | push 4 // f3aa | push eax // 8b4df8 | push edi $sequence_31 = { 57 50 ff5114 85c0 0f8c8c000000 } // n = 5, score = 100 // 57 | push eax // 50 | push edi // ff5114 | pop esi // 85c0 | ret // 0f8c8c000000 | test eax, eax $sequence_32 = { ffd6 6a00 6a00 8d8424140c0000 6a00 } // n = 5, score = 100 // ffd6 | test eax, eax // 6a00 | push 0 // 6a00 | mov edi, eax // 8d8424140c0000 | test edi, edi // 6a00 | jne 0xc $sequence_33 = { 58 7577 ff7508 8b7d08 } // n = 4, score = 100 // 58 | push esi // 7577 | push eax // ff7508 | lea eax, [ebp - 4] // 8b7d08 | push 4 condition: 7 of them and filesize < 74309632 }
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