Malware which seems to have no function other than to disrupt computer systems related to the 2018 Winter Olympic event.
rule win_olympic_destroyer_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.olympic_destroyer." 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.olympic_destroyer" 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 = { 56 33c0 89542414 57 } // n = 4, score = 200 // 56 | push esi // 33c0 | xor eax, eax // 89542414 | mov dword ptr [esp + 0x14], edx // 57 | push edi $sequence_1 = { 50 6801010000 6a00 68???????? 6801000080 83ceff } // n = 6, score = 100 // 50 | push eax // 6801010000 | push 0x101 // 6a00 | push 0 // 68???????? | // 6801000080 | push 0x80000001 // 83ceff | or esi, 0xffffffff $sequence_2 = { 898d7cf9ffff 8dbd80f9ffff ab ff15???????? } // n = 4, score = 100 // 898d7cf9ffff | mov dword ptr [ebp - 0x684], ecx // 8dbd80f9ffff | lea edi, [ebp - 0x680] // ab | stosd dword ptr es:[edi], eax // ff15???????? | $sequence_3 = { 50 6800010000 e8???????? 83c408 85c0 } // n = 5, score = 100 // 50 | push eax // 6800010000 | push 0x100 // e8???????? | // 83c408 | add esp, 8 // 85c0 | test eax, eax $sequence_4 = { 8974241c 8b07 89742424 33f6 89442420 } // n = 5, score = 100 // 8974241c | mov dword ptr [esp + 0x1c], esi // 8b07 | mov eax, dword ptr [edi] // 89742424 | mov dword ptr [esp + 0x24], esi // 33f6 | xor esi, esi // 89442420 | mov dword ptr [esp + 0x20], eax $sequence_5 = { 8b048560ee5500 33db 8b7508 57 8b440818 } // n = 5, score = 100 // 8b048560ee5500 | mov eax, dword ptr [eax*4 + 0x55ee60] // 33db | xor ebx, ebx // 8b7508 | mov esi, dword ptr [ebp + 8] // 57 | push edi // 8b440818 | mov eax, dword ptr [eax + ecx + 0x18] $sequence_6 = { 50 6819000200 6a00 8d85fccfffff } // n = 4, score = 100 // 50 | push eax // 6819000200 | push 0x20019 // 6a00 | push 0 // 8d85fccfffff | lea eax, [ebp - 0x3004] $sequence_7 = { 50 6805010000 ff15???????? 8d442430 } // n = 4, score = 100 // 50 | push eax // 6805010000 | push 0x105 // ff15???????? | // 8d442430 | lea eax, [esp + 0x30] $sequence_8 = { 83e203 83f908 7229 f3a5 ff2495804b4000 } // n = 5, score = 100 // 83e203 | and edx, 3 // 83f908 | cmp ecx, 8 // 7229 | jb 0x2b // f3a5 | rep movsd dword ptr es:[edi], dword ptr [esi] // ff2495804b4000 | jmp dword ptr [edx*4 + 0x404b80] $sequence_9 = { 83f808 74b9 83f807 77c4 ff2485a1345400 8bce e8???????? } // n = 7, score = 100 // 83f808 | cmp eax, 8 // 74b9 | je 0xffffffbb // 83f807 | cmp eax, 7 // 77c4 | ja 0xffffffc6 // ff2485a1345400 | jmp dword ptr [eax*4 + 0x5434a1] // 8bce | mov ecx, esi // e8???????? | $sequence_10 = { 50 660f73d80c 660f7ec0 53 ff75b0 50 8b4018 } // n = 7, score = 100 // 50 | push eax // 660f73d80c | psrldq xmm0, 0xc // 660f7ec0 | movd eax, xmm0 // 53 | push ebx // ff75b0 | push dword ptr [ebp - 0x50] // 50 | push eax // 8b4018 | mov eax, dword ptr [eax + 0x18] $sequence_11 = { 8b5dd0 ebab c745e4a8614000 817de4ac614000 7311 8b45e4 8b00 } // n = 7, score = 100 // 8b5dd0 | mov ebx, dword ptr [ebp - 0x30] // ebab | jmp 0xffffffad // c745e4a8614000 | mov dword ptr [ebp - 0x1c], 0x4061a8 // 817de4ac614000 | cmp dword ptr [ebp - 0x1c], 0x4061ac // 7311 | jae 0x13 // 8b45e4 | mov eax, dword ptr [ebp - 0x1c] // 8b00 | mov eax, dword ptr [eax] $sequence_12 = { ff15???????? 56 ff15???????? cc 3b0d???????? 7502 f3c3 } // n = 7, score = 100 // ff15???????? | // 56 | push esi // ff15???????? | // cc | int3 // 3b0d???????? | // 7502 | jne 4 // f3c3 | ret $sequence_13 = { 3db8240000 730a bb28000000 8d6bf8 eb08 bb3c000000 } // n = 6, score = 100 // 3db8240000 | cmp eax, 0x24b8 // 730a | jae 0xc // bb28000000 | mov ebx, 0x28 // 8d6bf8 | lea ebp, [ebx - 8] // eb08 | jmp 0xa // bb3c000000 | mov ebx, 0x3c $sequence_14 = { 59 59 031cb560ee5500 f6432880 } // n = 4, score = 100 // 59 | pop ecx // 59 | pop ecx // 031cb560ee5500 | add ebx, dword ptr [esi*4 + 0x55ee60] // f6432880 | test byte ptr [ebx + 0x28], 0x80 $sequence_15 = { e8???????? c9 c3 55 8bec b82c100000 } // n = 6, score = 100 // e8???????? | // c9 | leave // c3 | ret // 55 | push ebp // 8bec | mov ebp, esp // b82c100000 | mov eax, 0x102c $sequence_16 = { 50 6805010000 8d85ecfdffff 50 68???????? } // n = 5, score = 100 // 50 | push eax // 6805010000 | push 0x105 // 8d85ecfdffff | lea eax, [ebp - 0x214] // 50 | push eax // 68???????? | $sequence_17 = { 50 ffd3 8d85c0f9ffff 50 ffb590f9ffff ffd3 f68594f9ffff10 } // n = 7, score = 100 // 50 | push eax // ffd3 | call ebx // 8d85c0f9ffff | lea eax, [ebp - 0x640] // 50 | push eax // ffb590f9ffff | push dword ptr [ebp - 0x670] // ffd3 | call ebx // f68594f9ffff10 | test byte ptr [ebp - 0x66c], 0x10 $sequence_18 = { ff15???????? 56 8d85f8efffff 50 6800100000 8d85fcefffff 50 } // n = 7, score = 100 // ff15???????? | // 56 | push esi // 8d85f8efffff | lea eax, [ebp - 0x1008] // 50 | push eax // 6800100000 | push 0x1000 // 8d85fcefffff | lea eax, [ebp - 0x1004] // 50 | push eax $sequence_19 = { 746a 83e805 7456 83e801 0f859b010000 c745e0c89c5500 } // n = 6, score = 100 // 746a | je 0x6c // 83e805 | sub eax, 5 // 7456 | je 0x58 // 83e801 | sub eax, 1 // 0f859b010000 | jne 0x1a1 // c745e0c89c5500 | mov dword ptr [ebp - 0x20], 0x559cc8 $sequence_20 = { 50 6800080000 53 8bcf 660f134580 } // n = 5, score = 100 // 50 | push eax // 6800080000 | push 0x800 // 53 | push ebx // 8bcf | mov ecx, edi // 660f134580 | movlpd qword ptr [ebp - 0x80], xmm0 $sequence_21 = { 33f6 56 ff15???????? 8945e0 3bc6 } // n = 5, score = 100 // 33f6 | xor esi, esi // 56 | push esi // ff15???????? | // 8945e0 | mov dword ptr [ebp - 0x20], eax // 3bc6 | cmp eax, esi $sequence_22 = { 8d4c2414 6a04 89442420 c7442418bcf25500 e8???????? 83c404 a3???????? } // n = 7, score = 100 // 8d4c2414 | lea ecx, [esp + 0x14] // 6a04 | push 4 // 89442420 | mov dword ptr [esp + 0x20], eax // c7442418bcf25500 | mov dword ptr [esp + 0x18], 0x55f2bc // e8???????? | // 83c404 | add esp, 4 // a3???????? | condition: 7 of them and filesize < 1392640 }
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