Actor(s): Naikon
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rule win_xsplus_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.xsplus." 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.xsplus" 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 = { 8b7e20 8b36 66394f18 75f2 } // n = 4, score = 400 // 8b7e20 | mov edi, dword ptr [esi + 0x20] // 8b36 | mov esi, dword ptr [esi] // 66394f18 | cmp word ptr [edi + 0x18], cx // 75f2 | jne 0xfffffff4 $sequence_1 = { 6800180000 6a00 ff15???????? 8945fc 837dfc00 7502 } // n = 6, score = 300 // 6800180000 | push 0x1800 // 6a00 | push 0 // ff15???????? | // 8945fc | mov dword ptr [ebp - 4], eax // 837dfc00 | cmp dword ptr [ebp - 4], 0 // 7502 | jne 4 $sequence_2 = { 68d1870100 8b4d08 51 ff15???????? 50 ff15???????? } // n = 6, score = 300 // 68d1870100 | push 0x187d1 // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 51 | push ecx // ff15???????? | // 50 | push eax // ff15???????? | $sequence_3 = { 033485c0d14000 8b45e4 8b00 8906 } // n = 4, score = 300 // 033485c0d14000 | add esi, dword ptr [eax*4 + 0x40d1c0] // 8b45e4 | mov eax, dword ptr [ebp - 0x1c] // 8b00 | mov eax, dword ptr [eax] // 8906 | mov dword ptr [esi], eax $sequence_4 = { 7377 8b550c 0355fc 8b4508 0345fc 8a08 880a } // n = 7, score = 300 // 7377 | jae 0x79 // 8b550c | mov edx, dword ptr [ebp + 0xc] // 0355fc | add edx, dword ptr [ebp - 4] // 8b4508 | mov eax, dword ptr [ebp + 8] // 0345fc | add eax, dword ptr [ebp - 4] // 8a08 | mov cl, byte ptr [eax] // 880a | mov byte ptr [edx], cl $sequence_5 = { 3955e0 720e 8b45d0 034508 0345fc 3945e0 } // n = 6, score = 300 // 3955e0 | cmp dword ptr [ebp - 0x20], edx // 720e | jb 0x10 // 8b45d0 | mov eax, dword ptr [ebp - 0x30] // 034508 | add eax, dword ptr [ebp + 8] // 0345fc | add eax, dword ptr [ebp - 4] // 3945e0 | cmp dword ptr [ebp - 0x20], eax $sequence_6 = { 83c40c 8d95fcfeffff 52 ff15???????? } // n = 4, score = 300 // 83c40c | add esp, 0xc // 8d95fcfeffff | lea edx, [ebp - 0x104] // 52 | push edx // ff15???????? | $sequence_7 = { 6a00 ff15???????? 89859cfeffff 83bd9cfeffff00 7507 33c0 } // n = 6, score = 300 // 6a00 | push 0 // ff15???????? | // 89859cfeffff | mov dword ptr [ebp - 0x164], eax // 83bd9cfeffff00 | cmp dword ptr [ebp - 0x164], 0 // 7507 | jne 9 // 33c0 | xor eax, eax $sequence_8 = { e9???????? 6a00 ff15???????? b801000000 e9???????? 8b5510 81e2ffff0000 } // n = 7, score = 300 // e9???????? | // 6a00 | push 0 // ff15???????? | // b801000000 | mov eax, 1 // e9???????? | // 8b5510 | mov edx, dword ptr [ebp + 0x10] // 81e2ffff0000 | and edx, 0xffff $sequence_9 = { 40 0084444000a844 40 0023 d18a0688078a 46 } // n = 6, score = 300 // 40 | inc eax // 0084444000a844 | add byte ptr [esp + eax*2 + 0x44a80040], al // 40 | inc eax // 0023 | add byte ptr [ebx], ah // d18a0688078a | ror dword ptr [edx - 0x75f877fa], 1 // 46 | inc esi $sequence_10 = { 33c0 8dbdd5feffff f3ab 66ab aa c745d800000000 } // n = 6, score = 300 // 33c0 | xor eax, eax // 8dbdd5feffff | lea edi, [ebp - 0x12b] // f3ab | rep stosd dword ptr es:[edi], eax // 66ab | stosw word ptr es:[edi], ax // aa | stosb byte ptr es:[edi], al // c745d800000000 | mov dword ptr [ebp - 0x28], 0 $sequence_11 = { 8b45e4 8b4ddc 33d2 668b1441 } // n = 4, score = 300 // 8b45e4 | mov eax, dword ptr [ebp - 0x1c] // 8b4ddc | mov ecx, dword ptr [ebp - 0x24] // 33d2 | xor edx, edx // 668b1441 | mov dx, word ptr [ecx + eax*2] $sequence_12 = { 034df8 0fbe11 83fa5c 751c 8b45f4 } // n = 5, score = 300 // 034df8 | add ecx, dword ptr [ebp - 8] // 0fbe11 | movsx edx, byte ptr [ecx] // 83fa5c | cmp edx, 0x5c // 751c | jne 0x1e // 8b45f4 | mov eax, dword ptr [ebp - 0xc] $sequence_13 = { 8b45e4 3b45d8 0f8d24010000 8b4de4 8b55f8 } // n = 5, score = 300 // 8b45e4 | mov eax, dword ptr [ebp - 0x1c] // 3b45d8 | cmp eax, dword ptr [ebp - 0x28] // 0f8d24010000 | jge 0x12a // 8b4de4 | mov ecx, dword ptr [ebp - 0x1c] // 8b55f8 | mov edx, dword ptr [ebp - 8] $sequence_14 = { 83bd98feffff00 7507 33c0 e9???????? 8b8598feffff 50 } // n = 6, score = 300 // 83bd98feffff00 | cmp dword ptr [ebp - 0x168], 0 // 7507 | jne 9 // 33c0 | xor eax, eax // e9???????? | // 8b8598feffff | mov eax, dword ptr [ebp - 0x168] // 50 | push eax $sequence_15 = { 2b4df0 894de8 8b55f8 3b55e8 731e 8b4514 } // n = 6, score = 300 // 2b4df0 | sub ecx, dword ptr [ebp - 0x10] // 894de8 | mov dword ptr [ebp - 0x18], ecx // 8b55f8 | mov edx, dword ptr [ebp - 8] // 3b55e8 | cmp edx, dword ptr [ebp - 0x18] // 731e | jae 0x20 // 8b4514 | mov eax, dword ptr [ebp + 0x14] $sequence_16 = { ff15???????? 8945d8 c745e000000000 33c9 894de4 894de8 } // n = 6, score = 300 // ff15???????? | // 8945d8 | mov dword ptr [ebp - 0x28], eax // c745e000000000 | mov dword ptr [ebp - 0x20], 0 // 33c9 | xor ecx, ecx // 894de4 | mov dword ptr [ebp - 0x1c], ecx // 894de8 | mov dword ptr [ebp - 0x18], ecx condition: 7 of them and filesize < 597872 }
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