Actor(s): UPS
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rule win_shareip_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.shareip." 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.shareip" 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 = { 8d8534feffff e9???????? 8d8da8feffff e9???????? 8d8558feffff e9???????? 8d8544ffffff } // n = 7, score = 100 // 8d8534feffff | lea eax, [ebp - 0x1cc] // e9???????? | // 8d8da8feffff | lea ecx, [ebp - 0x158] // e9???????? | // 8d8558feffff | lea eax, [ebp - 0x1a8] // e9???????? | // 8d8544ffffff | lea eax, [ebp - 0xbc] $sequence_1 = { 894638 85c9 740f 8bd0 8d4900 8a01 8802 } // n = 7, score = 100 // 894638 | mov dword ptr [esi + 0x38], eax // 85c9 | test ecx, ecx // 740f | je 0x11 // 8bd0 | mov edx, eax // 8d4900 | lea ecx, [ecx] // 8a01 | mov al, byte ptr [ecx] // 8802 | mov byte ptr [edx], al $sequence_2 = { 8a8064954500 08443b1d 0fb64601 47 3bf8 76ea 8b7d08 } // n = 7, score = 100 // 8a8064954500 | mov al, byte ptr [eax + 0x459564] // 08443b1d | or byte ptr [ebx + edi + 0x1d], al // 0fb64601 | movzx eax, byte ptr [esi + 1] // 47 | inc edi // 3bf8 | cmp edi, eax // 76ea | jbe 0xffffffec // 8b7d08 | mov edi, dword ptr [ebp + 8] $sequence_3 = { 395c2444 7426 3bc3 7422 50 e8???????? 8b4c2444 } // n = 7, score = 100 // 395c2444 | cmp dword ptr [esp + 0x44], ebx // 7426 | je 0x28 // 3bc3 | cmp eax, ebx // 7422 | je 0x24 // 50 | push eax // e8???????? | // 8b4c2444 | mov ecx, dword ptr [esp + 0x44] $sequence_4 = { 834dfcff 894614 83c40c 8d45e4 50 e8???????? 8b07 } // n = 7, score = 100 // 834dfcff | or dword ptr [ebp - 4], 0xffffffff // 894614 | mov dword ptr [esi + 0x14], eax // 83c40c | add esp, 0xc // 8d45e4 | lea eax, [ebp - 0x1c] // 50 | push eax // e8???????? | // 8b07 | mov eax, dword ptr [edi] $sequence_5 = { 8b44241c 50 8d8c24a0010000 51 53 53 53 } // n = 7, score = 100 // 8b44241c | mov eax, dword ptr [esp + 0x1c] // 50 | push eax // 8d8c24a0010000 | lea ecx, [esp + 0x1a0] // 51 | push ecx // 53 | push ebx // 53 | push ebx // 53 | push ebx $sequence_6 = { 55 8d4c245c e8???????? 8bd8 895c2414 83fbff 7541 } // n = 7, score = 100 // 55 | push ebp // 8d4c245c | lea ecx, [esp + 0x5c] // e8???????? | // 8bd8 | mov ebx, eax // 895c2414 | mov dword ptr [esp + 0x14], ebx // 83fbff | cmp ebx, -1 // 7541 | jne 0x43 $sequence_7 = { 837de800 7e50 8b03 8b4804 0fb7541930 8d0419 8b4828 } // n = 7, score = 100 // 837de800 | cmp dword ptr [ebp - 0x18], 0 // 7e50 | jle 0x52 // 8b03 | mov eax, dword ptr [ebx] // 8b4804 | mov ecx, dword ptr [eax + 4] // 0fb7541930 | movzx edx, word ptr [ecx + ebx + 0x30] // 8d0419 | lea eax, [ecx + ebx] // 8b4828 | mov ecx, dword ptr [eax + 0x28] $sequence_8 = { 8b9a80f34400 33f3 8b4538 33db 8b553c 33c6 33d6 } // n = 7, score = 100 // 8b9a80f34400 | mov ebx, dword ptr [edx + 0x44f380] // 33f3 | xor esi, ebx // 8b4538 | mov eax, dword ptr [ebp + 0x38] // 33db | xor ebx, ebx // 8b553c | mov edx, dword ptr [ebp + 0x3c] // 33c6 | xor eax, esi // 33d6 | xor edx, esi $sequence_9 = { 33c0 eb05 1bc0 83d8ff 3bc3 7506 895c2418 } // n = 7, score = 100 // 33c0 | xor eax, eax // eb05 | jmp 7 // 1bc0 | sbb eax, eax // 83d8ff | sbb eax, -1 // 3bc3 | cmp eax, ebx // 7506 | jne 8 // 895c2418 | mov dword ptr [esp + 0x18], ebx condition: 7 of them and filesize < 811008 }
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