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rule win_coronavirus_ransomware_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.coronavirus_ransomware." 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.coronavirus_ransomware" malpedia_rule_date = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { 837de001 0f8eda030000 b9???????? 8b45d0 8b4004 668b10 663b11 } // n = 7, score = 100 // 837de001 | cmp dword ptr [ebp - 0x20], 1 // 0f8eda030000 | jle 0x3e0 // b9???????? | // 8b45d0 | mov eax, dword ptr [ebp - 0x30] // 8b4004 | mov eax, dword ptr [eax + 4] // 668b10 | mov dx, word ptr [eax] // 663b11 | cmp dx, word ptr [ecx] $sequence_1 = { a3???????? ba01000000 b8???????? 8b08 8bf1 c1ee1e 33f1 } // n = 7, score = 100 // a3???????? | // ba01000000 | mov edx, 1 // b8???????? | // 8b08 | mov ecx, dword ptr [eax] // 8bf1 | mov esi, ecx // c1ee1e | shr esi, 0x1e // 33f1 | xor esi, ecx $sequence_2 = { 66898c05682effff 83c002 6685c9 75e9 68???????? } // n = 5, score = 100 // 66898c05682effff | mov word ptr [ebp + eax - 0xd198], cx // 83c002 | add eax, 2 // 6685c9 | test cx, cx // 75e9 | jne 0xffffffeb // 68???????? | $sequence_3 = { 50 e8???????? 89bd74feffff 6800010000 57 8d8d78feffff } // n = 6, score = 100 // 50 | push eax // e8???????? | // 89bd74feffff | mov dword ptr [ebp - 0x18c], edi // 6800010000 | push 0x100 // 57 | push edi // 8d8d78feffff | lea ecx, [ebp - 0x188] $sequence_4 = { 85c0 7515 668b0b 83c302 } // n = 4, score = 100 // 85c0 | test eax, eax // 7515 | jne 0x17 // 668b0b | mov cx, word ptr [ebx] // 83c302 | add ebx, 2 $sequence_5 = { 52 50 51 ffd7 85c0 7405 } // n = 6, score = 100 // 52 | push edx // 50 | push eax // 51 | push ecx // ffd7 | call edi // 85c0 | test eax, eax // 7405 | je 7 $sequence_6 = { 89048d8ccf4000 81f9e3000000 7cc1 81f96f020000 7d3a } // n = 5, score = 100 // 89048d8ccf4000 | mov dword ptr [ecx*4 + 0x40cf8c], eax // 81f9e3000000 | cmp ecx, 0xe3 // 7cc1 | jl 0xffffffc3 // 81f96f020000 | cmp ecx, 0x26f // 7d3a | jge 0x3c $sequence_7 = { 85c0 7420 8a11 3a16 755b 83f801 7615 } // n = 7, score = 100 // 85c0 | test eax, eax // 7420 | je 0x22 // 8a11 | mov dl, byte ptr [ecx] // 3a16 | cmp dl, byte ptr [esi] // 755b | jne 0x5d // 83f801 | cmp eax, 1 // 7615 | jbe 0x17 $sequence_8 = { 8b15???????? 51 6a08 52 89442444 ffd6 } // n = 6, score = 100 // 8b15???????? | // 51 | push ecx // 6a08 | push 8 // 52 | push edx // 89442444 | mov dword ptr [esp + 0x44], eax // ffd6 | call esi $sequence_9 = { 8b4604 68???????? 50 ffd7 83c418 85c0 } // n = 6, score = 100 // 8b4604 | mov eax, dword ptr [esi + 4] // 68???????? | // 50 | push eax // ffd7 | call edi // 83c418 | add esp, 0x18 // 85c0 | test eax, eax condition: 7 of them and filesize < 235520 }
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