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rule win_simplefilemover_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 = { 8bfc f3a5 e8???????? 81c420020000 85c0 } // n = 5, score = 600 // 8bfc | mov edi, esp // 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 } // n = 4, score = 500 // 7d07 | jge 9 // 33c0 | xor eax, eax // e9???????? | // 6820020000 | push 0x220 $sequence_2 = { ff15???????? 898504daffff 83bd04daffffff 750f c78508daffff00000000 } // n = 5, score = 300 // 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 $sequence_3 = { e8???????? 83c408 6a04 8d9554daffff } // n = 4, score = 300 // e8???????? | // 83c408 | add esp, 8 // 6a04 | push 4 // 8d9554daffff | lea edx, [ebp - 0x25ac] $sequence_4 = { 52 e8???????? 83c40c 6a00 6a08 8d8554daffff } // n = 6, score = 300 // 52 | push edx // e8???????? | // 83c40c | add esp, 0xc // 6a00 | push 0 // 6a08 | push 8 // 8d8554daffff | lea eax, [ebp - 0x25ac] $sequence_5 = { b988000000 8bf3 8bfc f3a5 } // n = 4, score = 300 // b988000000 | mov ecx, 0x88 // 8bf3 | mov esi, ebx // 8bfc | mov edi, esp // f3a5 | rep movsd dword ptr es:[edi], dword ptr [esi] $sequence_6 = { 81c420020000 85c0 7407 68???????? } // n = 4, score = 300 // 81c420020000 | add esp, 0x220 // 85c0 | test eax, eax // 7407 | je 9 // 68???????? | $sequence_7 = { 8d8558faffff 50 e8???????? 83c40c 83bd58faffff00 } // n = 5, score = 300 // 8d8558faffff | lea eax, [ebp - 0x5a8] // 50 | push eax // e8???????? | // 83c40c | add esp, 0xc // 83bd58faffff00 | cmp dword ptr [ebp - 0x5a8], 0 $sequence_8 = { 83bd58faffff02 751d 68???????? ff15???????? 83c404 c78508daffff00000000 } // n = 6, score = 300 // 83bd58faffff02 | cmp dword ptr [ebp - 0x5a8], 2 // 751d | jne 0x1f // 68???????? | // ff15???????? | // 83c404 | add esp, 4 // c78508daffff00000000 | mov dword ptr [ebp - 0x25f8], 0 $sequence_9 = { 83c40c 6a04 8d9510daffff 52 8b8540daffff 8d8c4560daffff } // n = 6, score = 300 // 83c40c | add esp, 0xc // 6a04 | push 4 // 8d9510daffff | lea edx, [ebp - 0x25f0] // 52 | push edx // 8b8540daffff | mov eax, dword ptr [ebp - 0x25c0] // 8d8c4560daffff | lea ecx, [ebp + eax*2 - 0x25a0] $sequence_10 = { 8a1c01 885c241c 81e3ff000000 03de 81e3ff000080 7908 4b } // n = 7, score = 200 // 8a1c01 | mov bl, byte ptr [ecx + eax] // 885c241c | mov byte ptr [esp + 0x1c], bl // 81e3ff000000 | and ebx, 0xff // 03de | add ebx, esi // 81e3ff000080 | and ebx, 0x800000ff // 7908 | jns 0xa // 4b | dec ebx $sequence_11 = { 89450c 8d440002 50 e8???????? } // n = 4, score = 200 // 89450c | mov dword ptr [ebp + 0xc], eax // 8d440002 | lea eax, [eax + eax + 2] // 50 | push eax // e8???????? | $sequence_12 = { 43 8b6c2424 81e3ff000000 8a1c03 301c2f } // n = 5, score = 200 // 43 | inc ebx // 8b6c2424 | mov ebp, dword ptr [esp + 0x24] // 81e3ff000000 | and ebx, 0xff // 8a1c03 | mov bl, byte ptr [ebx + eax] // 301c2f | xor byte ptr [edi + ebp], bl $sequence_13 = { c3 8b542414 53 52 ff15???????? 83c408 } // n = 6, score = 200 // c3 | ret // 8b542414 | mov edx, dword ptr [esp + 0x14] // 53 | push ebx // 52 | push edx // ff15???????? | // 83c408 | add esp, 8 $sequence_14 = { 33ff 884c2408 3bf7 88542424 } // n = 4, score = 200 // 33ff | xor edi, edi // 884c2408 | mov byte ptr [esp + 8], cl // 3bf7 | cmp esi, edi // 88542424 | mov byte ptr [esp + 0x24], dl $sequence_15 = { 8b742424 53 81e1ff000000 55 81e6ff000000 8d5101 81e2ff000080 } // n = 7, score = 200 // 8b742424 | mov esi, dword ptr [esp + 0x24] // 53 | push ebx // 81e1ff000000 | and ecx, 0xff // 55 | push ebp // 81e6ff000000 | and esi, 0xff // 8d5101 | lea edx, [ecx + 1] // 81e2ff000080 | and edx, 0x800000ff $sequence_16 = { ff15???????? ebdc 8d859cdbffff 895de4 } // n = 4, score = 200 // ff15???????? | // ebdc | jmp 0xffffffde // 8d859cdbffff | lea eax, [ebp - 0x2464] // 895de4 | mov dword ptr [ebp - 0x1c], ebx $sequence_17 = { 50 e8???????? 8d85a4ddffff 57 50 8d45f8 50 } // n = 7, score = 200 // 50 | push eax // e8???????? | // 8d85a4ddffff | lea eax, [ebp - 0x225c] // 57 | push edi // 50 | push eax // 8d45f8 | lea eax, [ebp - 8] // 50 | push eax $sequence_18 = { 47 897c2418 0fbfff 3bfb 0f8c54ffffff 8a4c242c } // n = 6, score = 200 // 47 | inc edi // 897c2418 | mov dword ptr [esp + 0x18], edi // 0fbfff | movsx edi, di // 3bfb | cmp edi, ebx // 0f8c54ffffff | jl 0xffffff5a // 8a4c242c | mov cl, byte ptr [esp + 0x2c] $sequence_19 = { 8a5c241c 8b74242c 885c2414 81e6ff000000 8b6c2414 81e5ff000000 8a1c06 } // n = 7, score = 200 // 8a5c241c | mov bl, byte ptr [esp + 0x1c] // 8b74242c | mov esi, dword ptr [esp + 0x2c] // 885c2414 | mov byte ptr [esp + 0x14], bl // 81e6ff000000 | and esi, 0xff // 8b6c2414 | mov ebp, dword ptr [esp + 0x14] // 81e5ff000000 | and ebp, 0xff // 8a1c06 | mov bl, byte ptr [esi + eax] $sequence_20 = { 668b4102 83c102 42 6685c0 75ea 85f6 } // n = 6, score = 200 // 668b4102 | mov ax, word ptr [ecx + 2] // 83c102 | add ecx, 2 // 42 | inc edx // 6685c0 | test ax, ax // 75ea | jne 0xffffffec // 85f6 | test esi, esi $sequence_21 = { 59 59 7512 53 } // n = 4, score = 200 // 59 | pop ecx // 59 | pop ecx // 7512 | jne 0x14 // 53 | push ebx condition: 7 of them and filesize < 73728 }
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