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rule win_multigrain_pos_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.multigrain_pos." 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.multigrain_pos" 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 = { c745fc00000000 8b7518 b8cdcccccc 8d0cf504000000 } // n = 4, score = 200 // c745fc00000000 | mov dword ptr [ebp - 4], 0 // 8b7518 | mov esi, dword ptr [ebp + 0x18] // b8cdcccccc | mov eax, 0xcccccccd // 8d0cf504000000 | lea ecx, [esi*8 + 4] $sequence_1 = { 57 e8???????? 83c404 6a00 c746140f000000 } // n = 5, score = 200 // 57 | push edi // e8???????? | // 83c404 | add esp, 4 // 6a00 | push 0 // c746140f000000 | mov dword ptr [esi + 0x14], 0xf $sequence_2 = { c645fc01 e8???????? 83c408 83bdb4fdffff08 720e ffb5a0fdffff } // n = 6, score = 200 // c645fc01 | mov byte ptr [ebp - 4], 1 // e8???????? | // 83c408 | add esp, 8 // 83bdb4fdffff08 | cmp dword ptr [ebp - 0x24c], 8 // 720e | jb 0x10 // ffb5a0fdffff | push dword ptr [ebp - 0x260] $sequence_3 = { 0f8530020000 68c8000000 50 8d85c4feffff 50 e8???????? 83c40c } // n = 7, score = 200 // 0f8530020000 | jne 0x236 // 68c8000000 | push 0xc8 // 50 | push eax // 8d85c4feffff | lea eax, [ebp - 0x13c] // 50 | push eax // e8???????? | // 83c40c | add esp, 0xc $sequence_4 = { 0fb64c1e01 c1e905 894df4 eb07 c745f400000000 0fb60c1e 8b55f8 } // n = 7, score = 200 // 0fb64c1e01 | movzx ecx, byte ptr [esi + ebx + 1] // c1e905 | shr ecx, 5 // 894df4 | mov dword ptr [ebp - 0xc], ecx // eb07 | jmp 9 // c745f400000000 | mov dword ptr [ebp - 0xc], 0 // 0fb60c1e | movzx ecx, byte ptr [esi + ebx] // 8b55f8 | mov edx, dword ptr [ebp - 8] $sequence_5 = { 8bd0 8d4dd8 c645fc03 e8???????? } // n = 4, score = 200 // 8bd0 | mov edx, eax // 8d4dd8 | lea ecx, [ebp - 0x28] // c645fc03 | mov byte ptr [ebp - 4], 3 // e8???????? | $sequence_6 = { c745e0ffffffff c745e800000000 c745e400000000 c745ec01000000 c745f401000000 } // n = 5, score = 200 // c745e0ffffffff | mov dword ptr [ebp - 0x20], 0xffffffff // c745e800000000 | mov dword ptr [ebp - 0x18], 0 // c745e400000000 | mov dword ptr [ebp - 0x1c], 0 // c745ec01000000 | mov dword ptr [ebp - 0x14], 1 // c745f401000000 | mov dword ptr [ebp - 0xc], 1 $sequence_7 = { e8???????? 83c404 56 ffd3 33db 395f10 56 } // n = 7, score = 200 // e8???????? | // 83c404 | add esp, 4 // 56 | push esi // ffd3 | call ebx // 33db | xor ebx, ebx // 395f10 | cmp dword ptr [edi + 0x10], ebx // 56 | push esi $sequence_8 = { 81eca8040000 a1???????? 33c4 898424a4040000 56 57 } // n = 6, score = 200 // 81eca8040000 | sub esp, 0x4a8 // a1???????? | // 33c4 | xor eax, esp // 898424a4040000 | mov dword ptr [esp + 0x4a4], eax // 56 | push esi // 57 | push edi $sequence_9 = { c745f400000000 8b4df0 8b5df8 0fb609 83e101 } // n = 5, score = 200 // c745f400000000 | mov dword ptr [ebp - 0xc], 0 // 8b4df0 | mov ecx, dword ptr [ebp - 0x10] // 8b5df8 | mov ebx, dword ptr [ebp - 8] // 0fb609 | movzx ecx, byte ptr [ecx] // 83e101 | and ecx, 1 condition: 7 of them and filesize < 286720 }
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