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rule win_multigrain_pos_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" 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 = "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 = { c78538ffffff0f000000 c78534ffffff00000000 c68524ffffff00 c645fc1a 83bd68ffffff10 720e ffb554ffffff } // n = 7, score = 200 // c78538ffffff0f000000 | mov dword ptr [ebp - 0xc8], 0xf // c78534ffffff00000000 | mov dword ptr [ebp - 0xcc], 0 // c68524ffffff00 | mov byte ptr [ebp - 0xdc], 0 // c645fc1a | mov byte ptr [ebp - 4], 0x1a // 83bd68ffffff10 | cmp dword ptr [ebp - 0x98], 0x10 // 720e | jb 0x10 // ffb554ffffff | push dword ptr [ebp - 0xac] $sequence_1 = { 83e10f 03c9 0b4df4 40 } // n = 4, score = 200 // 83e10f | and ecx, 0xf // 03c9 | add ecx, ecx // 0b4df4 | or ecx, dword ptr [ebp - 0xc] // 40 | inc eax $sequence_2 = { 730d 0fb64c1e01 c1e905 894df4 } // n = 4, score = 200 // 730d | jae 0xf // 0fb64c1e01 | movzx ecx, byte ptr [esi + ebx + 1] // c1e905 | shr ecx, 5 // 894df4 | mov dword ptr [ebp - 0xc], ecx $sequence_3 = { 8d7714 85c0 7435 51 } // n = 4, score = 200 // 8d7714 | lea esi, [edi + 0x14] // 85c0 | test eax, eax // 7435 | je 0x37 // 51 | push ecx $sequence_4 = { c7854cffffff00000000 c6853cffffff00 83bd20ffffff10 720e } // n = 4, score = 200 // c7854cffffff00000000 | mov dword ptr [ebp - 0xb4], 0 // c6853cffffff00 | mov byte ptr [ebp - 0xc4], 0 // 83bd20ffffff10 | cmp dword ptr [ebp - 0xe0], 0x10 // 720e | jb 0x10 $sequence_5 = { 83f908 720d 8b0e 50 8d145a e8???????? eb2c } // n = 7, score = 200 // 83f908 | cmp ecx, 8 // 720d | jb 0xf // 8b0e | mov ecx, dword ptr [esi] // 50 | push eax // 8d145a | lea edx, [edx + ebx*2] // e8???????? | // eb2c | jmp 0x2e $sequence_6 = { 8d45e8 50 8d45ec 0f57c0 50 } // n = 5, score = 200 // 8d45e8 | lea eax, [ebp - 0x18] // 50 | push eax // 8d45ec | lea eax, [ebp - 0x14] // 0f57c0 | xorps xmm0, xmm0 // 50 | push eax $sequence_7 = { ffd6 b301 837d1c08 720b ff7508 } // n = 5, score = 200 // ffd6 | call esi // b301 | mov bl, 1 // 837d1c08 | cmp dword ptr [ebp + 0x1c], 8 // 720b | jb 0xd // ff7508 | push dword ptr [ebp + 8] $sequence_8 = { 50 888534ffffff 8d8535ffffff 50 e8???????? 83c40c } // n = 6, score = 200 // 50 | push eax // 888534ffffff | mov byte ptr [ebp - 0xcc], al // 8d8535ffffff | lea eax, [ebp - 0xcb] // 50 | push eax // e8???????? | // 83c40c | add esp, 0xc $sequence_9 = { c784243c04000000000000 c784246804000000000000 c784246c04000000000000 c784247004000000000000 c784247404000000000000 e8???????? 8b3d???????? } // n = 7, score = 200 // c784243c04000000000000 | mov dword ptr [esp + 0x43c], 0 // c784246804000000000000 | mov dword ptr [esp + 0x468], 0 // c784246c04000000000000 | mov dword ptr [esp + 0x46c], 0 // c784247004000000000000 | mov dword ptr [esp + 0x470], 0 // c784247404000000000000 | mov dword ptr [esp + 0x474], 0 // e8???????? | // 8b3d???????? | condition: 7 of them and filesize < 286720 }
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