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 = "2022-08-05" 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 = "20220805" malpedia_hash = "6ec06c64bcfdbeda64eff021c766b4ce34542b71" malpedia_version = "20220808" 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 = { 5b 83c460 c3 ff742418 } // n = 4, score = 100 // 5b | pop ebx // 83c460 | add esp, 0x60 // c3 | ret // ff742418 | push dword ptr [esp + 0x18] $sequence_2 = { 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_3 = { 8975fc 8975f4 8975dc ffd3 } // n = 4, score = 100 // 8975fc | mov dword ptr [ebp - 4], esi // 8975f4 | mov dword ptr [ebp - 0xc], esi // 8975dc | mov dword ptr [ebp - 0x24], esi // ffd3 | call ebx $sequence_4 = { 50 ff15???????? 8d4ddc 51 8d4df4 } // n = 5, score = 100 // 50 | push eax // ff15???????? | // 8d4ddc | lea ecx, [ebp - 0x24] // 51 | push ecx // 8d4df4 | lea ecx, [ebp - 0xc] $sequence_5 = { 8b450c 0fb68401705a5500 c1e804 5d c20800 8bff 55 } // n = 7, score = 100 // 8b450c | mov eax, dword ptr [ebp + 0xc] // 0fb68401705a5500 | movzx eax, byte ptr [ecx + eax + 0x555a70] // c1e804 | shr eax, 4 // 5d | pop ebp // c20800 | ret 8 // 8bff | mov edi, edi // 55 | push ebp $sequence_6 = { 50 8b442434 56 ff74242c } // n = 4, score = 100 // 50 | push eax // 8b442434 | mov eax, dword ptr [esp + 0x34] // 56 | push esi // ff74242c | push dword ptr [esp + 0x2c] $sequence_7 = { 0f84fc000000 68???????? 8bd7 e8???????? 83c404 85c0 } // n = 6, score = 100 // 0f84fc000000 | je 0x102 // 68???????? | // 8bd7 | mov edx, edi // e8???????? | // 83c404 | add esp, 4 // 85c0 | test eax, eax $sequence_8 = { 50 6805010000 ff15???????? 8d442430 } // n = 4, score = 100 // 50 | push eax // 6805010000 | push 0x105 // ff15???????? | // 8d442430 | lea eax, [esp + 0x30] $sequence_9 = { 85c0 0f848c000000 68???????? 8d85c0f9ffff } // n = 4, score = 100 // 85c0 | test eax, eax // 0f848c000000 | je 0x92 // 68???????? | // 8d85c0f9ffff | lea eax, [ebp - 0x640] $sequence_10 = { 83ec08 8d542404 56 8bf1 e8???????? 85c0 } // n = 6, score = 100 // 83ec08 | sub esp, 8 // 8d542404 | lea edx, [esp + 4] // 56 | push esi // 8bf1 | mov esi, ecx // e8???????? | // 85c0 | test eax, eax $sequence_11 = { 8b4f08 8b01 3b44244c 753d } // n = 4, score = 100 // 8b4f08 | mov ecx, dword ptr [edi + 8] // 8b01 | mov eax, dword ptr [ecx] // 3b44244c | cmp eax, dword ptr [esp + 0x4c] // 753d | jne 0x3f $sequence_12 = { 8bf8 897dd4 8b5dd0 ebab c745e4a8614000 817de4ac614000 7311 } // n = 7, score = 100 // 8bf8 | mov edi, eax // 897dd4 | mov dword ptr [ebp - 0x2c], edi // 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 $sequence_13 = { 50 6819000200 6a00 8d85fccfffff } // n = 4, score = 100 // 50 | push eax // 6819000200 | push 0x20019 // 6a00 | push 0 // 8d85fccfffff | lea eax, [ebp - 0x3004] $sequence_14 = { bb???????? c70424???????? e8???????? c70424???????? e8???????? 59 } // n = 6, score = 100 // bb???????? | // c70424???????? | // e8???????? | // c70424???????? | // e8???????? | // 59 | pop ecx $sequence_15 = { 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_16 = { 8d842498000000 8b4e04 89442450 a1???????? 898c24a0000000 898424a4000000 } // n = 6, score = 100 // 8d842498000000 | lea eax, [esp + 0x98] // 8b4e04 | mov ecx, dword ptr [esi + 4] // 89442450 | mov dword ptr [esp + 0x50], eax // a1???????? | // 898c24a0000000 | mov dword ptr [esp + 0xa0], ecx // 898424a4000000 | mov dword ptr [esp + 0xa4], eax $sequence_17 = { 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_18 = { 53 ffd7 56 8d85e4efffff 50 6a01 } // n = 6, score = 100 // 53 | push ebx // ffd7 | call edi // 56 | push esi // 8d85e4efffff | lea eax, [ebp - 0x101c] // 50 | push eax // 6a01 | push 1 $sequence_19 = { 85c0 0f85b3000000 ff742410 6a40 ff15???????? 8bf0 } // n = 6, score = 100 // 85c0 | test eax, eax // 0f85b3000000 | jne 0xb9 // ff742410 | push dword ptr [esp + 0x10] // 6a40 | push 0x40 // ff15???????? | // 8bf0 | mov esi, eax $sequence_20 = { 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_21 = { 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_22 = { 68???????? 56 ff15???????? 8b45dc 8945f0 8b45e0 } // n = 6, score = 100 // 68???????? | // 56 | push esi // ff15???????? | // 8b45dc | mov eax, dword ptr [ebp - 0x24] // 8945f0 | mov dword ptr [ebp - 0x10], eax // 8b45e0 | mov eax, dword ptr [ebp - 0x20] condition: 7 of them and filesize < 1392640 }
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