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rule win_r980_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.r980." 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.r980" malpedia_rule_date = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { 0f95c0 84c0 7411 c645fc13 ff772c ff7728 6a01 } // n = 7, score = 200 // 0f95c0 | setne al // 84c0 | test al, al // 7411 | je 0x13 // c645fc13 | mov byte ptr [ebp - 4], 0x13 // ff772c | push dword ptr [edi + 0x2c] // ff7728 | push dword ptr [edi + 0x28] // 6a01 | push 1 $sequence_1 = { 720d 40 8d4dd8 50 ff75d8 e8???????? 8d45d8 } // n = 7, score = 200 // 720d | jb 0xf // 40 | inc eax // 8d4dd8 | lea ecx, [ebp - 0x28] // 50 | push eax // ff75d8 | push dword ptr [ebp - 0x28] // e8???????? | // 8d45d8 | lea eax, [ebp - 0x28] $sequence_2 = { b89c010000 c645fc1c 68???????? b9???????? 66a3???????? e8???????? b89d010000 } // n = 7, score = 200 // b89c010000 | mov eax, 0x19c // c645fc1c | mov byte ptr [ebp - 4], 0x1c // 68???????? | // b9???????? | // 66a3???????? | // e8???????? | // b89d010000 | mov eax, 0x19d $sequence_3 = { 85ff 7444 660f1f840000000000 8b0b ba02000000 8d4108 8710 } // n = 7, score = 200 // 85ff | test edi, edi // 7444 | je 0x46 // 660f1f840000000000 | nop word ptr [eax + eax] // 8b0b | mov ecx, dword ptr [ebx] // ba02000000 | mov edx, 2 // 8d4108 | lea eax, [ecx + 8] // 8710 | xchg dword ptr [eax], edx $sequence_4 = { 8b45e4 8b0c85f0285200 8b45e8 f644012880 7446 0fbec3 83e800 } // n = 7, score = 200 // 8b45e4 | mov eax, dword ptr [ebp - 0x1c] // 8b0c85f0285200 | mov ecx, dword ptr [eax*4 + 0x5228f0] // 8b45e8 | mov eax, dword ptr [ebp - 0x18] // f644012880 | test byte ptr [ecx + eax + 0x28], 0x80 // 7446 | je 0x48 // 0fbec3 | movsx eax, bl // 83e800 | sub eax, 0 $sequence_5 = { 8bd9 895dec 8b4508 8d5328 8b7510 8d4a10 c681f900000000 } // n = 7, score = 200 // 8bd9 | mov ebx, ecx // 895dec | mov dword ptr [ebp - 0x14], ebx // 8b4508 | mov eax, dword ptr [ebp + 8] // 8d5328 | lea edx, [ebx + 0x28] // 8b7510 | mov esi, dword ptr [ebp + 0x10] // 8d4a10 | lea ecx, [edx + 0x10] // c681f900000000 | mov byte ptr [ecx + 0xf9], 0 $sequence_6 = { 7462 85f6 741f 56 c745fc00000000 e8???????? 6a14 } // n = 7, score = 200 // 7462 | je 0x64 // 85f6 | test esi, esi // 741f | je 0x21 // 56 | push esi // c745fc00000000 | mov dword ptr [ebp - 4], 0 // e8???????? | // 6a14 | push 0x14 $sequence_7 = { 50 8d45f4 64a300000000 8bf2 51 8d4de4 e8???????? } // n = 7, score = 200 // 50 | push eax // 8d45f4 | lea eax, [ebp - 0xc] // 64a300000000 | mov dword ptr fs:[0], eax // 8bf2 | mov esi, edx // 51 | push ecx // 8d4de4 | lea ecx, [ebp - 0x1c] // e8???????? | $sequence_8 = { ff75d8 8d4dd8 e8???????? 8bc6 eb02 33c0 8b4df4 } // n = 7, score = 200 // ff75d8 | push dword ptr [ebp - 0x28] // 8d4dd8 | lea ecx, [ebp - 0x28] // e8???????? | // 8bc6 | mov eax, esi // eb02 | jmp 4 // 33c0 | xor eax, eax // 8b4df4 | mov ecx, dword ptr [ebp - 0xc] $sequence_9 = { 83780400 7456 83ec08 8bc4 53 50 e8???????? } // n = 7, score = 200 // 83780400 | cmp dword ptr [eax + 4], 0 // 7456 | je 0x58 // 83ec08 | sub esp, 8 // 8bc4 | mov eax, esp // 53 | push ebx // 50 | push eax // e8???????? | condition: 7 of them and filesize < 3178496 }
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