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rule win_simplefilemover_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.simplefilemover." 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.simplefilemover" 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 = { f3a5 e8???????? 81c420020000 85c0 } // n = 4, score = 500 // f3a5 | rep movsd dword ptr es:[edi], dword ptr [esi] // e8???????? | // 81c420020000 | add esp, 0x220 // 85c0 | test eax, eax $sequence_1 = { 7d07 33c0 e9???????? 6820020000 ff15???????? } // n = 5, score = 400 // 7d07 | jge 9 // 33c0 | xor eax, eax // e9???????? | // 6820020000 | push 0x220 // ff15???????? | $sequence_2 = { 81c420020000 85c0 7407 68???????? } // n = 4, score = 300 // 81c420020000 | add esp, 0x220 // 85c0 | test eax, eax // 7407 | je 9 // 68???????? | $sequence_3 = { 8bf3 8bfc f3a5 e8???????? } // n = 4, score = 300 // 8bf3 | mov esi, ebx // 8bfc | mov edi, esp // f3a5 | rep movsd dword ptr es:[edi], dword ptr [esi] // e8???????? | $sequence_4 = { e9???????? 6a00 6a04 8d9554daffff 52 8b8554faffff 50 } // n = 7, score = 200 // e9???????? | // 6a00 | push 0 // 6a04 | push 4 // 8d9554daffff | lea edx, [ebp - 0x25ac] // 52 | push edx // 8b8554faffff | mov eax, dword ptr [ebp - 0x5ac] // 50 | push eax $sequence_5 = { 885c242c 8a5c241c 8b74242c 885c2414 } // n = 4, score = 200 // 885c242c | mov byte ptr [esp + 0x2c], bl // 8a5c241c | mov bl, byte ptr [esp + 0x1c] // 8b74242c | mov esi, dword ptr [esp + 0x2c] // 885c2414 | mov byte ptr [esp + 0x14], bl $sequence_6 = { 33ff 884c2408 3bf7 88542424 897c2410 0f8eda000000 } // n = 6, score = 200 // 33ff | xor edi, edi // 884c2408 | mov byte ptr [esp + 8], cl // 3bf7 | cmp esi, edi // 88542424 | mov byte ptr [esp + 0x24], dl // 897c2410 | mov dword ptr [esp + 0x10], edi // 0f8eda000000 | jle 0xe0 $sequence_7 = { 8b8508daffff eb16 ebca ebc8 } // n = 4, score = 200 // 8b8508daffff | mov eax, dword ptr [ebp - 0x25f8] // eb16 | jmp 0x18 // ebca | jmp 0xffffffcc // ebc8 | jmp 0xffffffca $sequence_8 = { 2b85fcd9ffff 50 8b8d04daffff 51 } // n = 4, score = 200 // 2b85fcd9ffff | sub eax, dword ptr [ebp - 0x2604] // 50 | push eax // 8b8d04daffff | mov ecx, dword ptr [ebp - 0x25fc] // 51 | push ecx $sequence_9 = { 51 50 ff75f0 ff15???????? 8b45e8 } // n = 5, score = 200 // 51 | push ecx // 50 | push eax // ff75f0 | push dword ptr [ebp - 0x10] // ff15???????? | // 8b45e8 | mov eax, dword ptr [ebp - 0x18] $sequence_10 = { ff15???????? 898504daffff 83bd04daffffff 750f c78508daffff00000000 e9???????? } // n = 6, score = 200 // ff15???????? | // 898504daffff | mov dword ptr [ebp - 0x25fc], eax // 83bd04daffffff | cmp dword ptr [ebp - 0x25fc], -1 // 750f | jne 0x11 // c78508daffff00000000 | mov dword ptr [ebp - 0x25f8], 0 // e9???????? | $sequence_11 = { 7507 33c0 e9???????? 807d0867 0f848f020000 } // n = 5, score = 200 // 7507 | jne 9 // 33c0 | xor eax, eax // e9???????? | // 807d0867 | cmp byte ptr [ebp + 8], 0x67 // 0f848f020000 | je 0x295 $sequence_12 = { 897c2410 0f8eda000000 8b4c2408 8b742424 } // n = 4, score = 200 // 897c2410 | mov dword ptr [esp + 0x10], edi // 0f8eda000000 | jle 0xe0 // 8b4c2408 | mov ecx, dword ptr [esp + 8] // 8b742424 | mov esi, dword ptr [esp + 0x24] $sequence_13 = { ebbe ebbc ebba ebb8 ebb6 } // n = 5, score = 200 // ebbe | jmp 0xffffffc0 // ebbc | jmp 0xffffffbe // ebba | jmp 0xffffffbc // ebb8 | jmp 0xffffffba // ebb6 | jmp 0xffffffb8 $sequence_14 = { 68???????? ff15???????? 59 33ff ff75fc ff15???????? } // n = 6, score = 200 // 68???????? | // ff15???????? | // 59 | pop ecx // 33ff | xor edi, edi // ff75fc | push dword ptr [ebp - 4] // ff15???????? | $sequence_15 = { 8bcb 663d5c00 7503 8bfa 46 668b4102 } // n = 6, score = 200 // 8bcb | mov ecx, ebx // 663d5c00 | cmp ax, 0x5c // 7503 | jne 5 // 8bfa | mov edi, edx // 46 | inc esi // 668b4102 | mov ax, word ptr [ecx + 2] $sequence_16 = { ff15???????? 83c418 8945f4 8d850cdaffff 50 } // n = 5, score = 200 // ff15???????? | // 83c418 | add esp, 0x18 // 8945f4 | mov dword ptr [ebp - 0xc], eax // 8d850cdaffff | lea eax, [ebp - 0x25f4] // 50 | push eax $sequence_17 = { 8a4c242c 5d 5b 5f 889000010000 } // n = 5, score = 200 // 8a4c242c | mov cl, byte ptr [esp + 0x2c] // 5d | pop ebp // 5b | pop ebx // 5f | pop edi // 889000010000 | mov byte ptr [eax + 0x100], dl $sequence_18 = { 8b9540daffff d1e2 52 8d855cfaffff 50 8d8d60daffff 51 } // n = 7, score = 200 // 8b9540daffff | mov edx, dword ptr [ebp - 0x25c0] // d1e2 | shl edx, 1 // 52 | push edx // 8d855cfaffff | lea eax, [ebp - 0x5a4] // 50 | push eax // 8d8d60daffff | lea ecx, [ebp - 0x25a0] // 51 | push ecx $sequence_19 = { 56 8b74241c 57 8a8800010000 8a9001010000 } // n = 5, score = 200 // 56 | push esi // 8b74241c | mov esi, dword ptr [esp + 0x1c] // 57 | push edi // 8a8800010000 | mov cl, byte ptr [eax + 0x100] // 8a9001010000 | mov dl, byte ptr [eax + 0x101] $sequence_20 = { 83c102 42 6685c0 75ea } // n = 4, score = 200 // 83c102 | add ecx, 2 // 42 | inc edx // 6685c0 | test ax, ax // 75ea | jne 0xffffffec $sequence_21 = { 7908 4b 81cb00ffffff 43 8b6c2424 81e3ff000000 8a1c03 } // n = 7, score = 200 // 7908 | jns 0xa // 4b | dec ebx // 81cb00ffffff | or ebx, 0xffffff00 // 43 | inc ebx // 8b6c2424 | mov ebp, dword ptr [esp + 0x24] // 81e3ff000000 | and ebx, 0xff // 8a1c03 | mov bl, byte ptr [ebx + eax] condition: 7 of them and filesize < 57344 }
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