Actor(s): UPS
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rule win_shareip_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" 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 = "20220405" malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a" malpedia_version = "20220411" 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 = { e9???????? 8b542408 8d82e0faffff 8b8adcfaffff 33c8 e8???????? } // n = 6, score = 100 // e9???????? | // 8b542408 | mov edx, dword ptr [esp + 8] // 8d82e0faffff | lea eax, dword ptr [edx - 0x520] // 8b8adcfaffff | mov ecx, dword ptr [edx - 0x524] // 33c8 | xor ecx, eax // e8???????? | $sequence_1 = { 885eec 83c61c 8d46e8 3bc7 75d9 8b74242c 56 } // n = 7, score = 100 // 885eec | mov byte ptr [esi - 0x14], bl // 83c61c | add esi, 0x1c // 8d46e8 | lea eax, dword ptr [esi - 0x18] // 3bc7 | cmp eax, edi // 75d9 | jne 0xffffffdb // 8b74242c | mov esi, dword ptr [esp + 0x2c] // 56 | push esi $sequence_2 = { 83c004 837c242010 7202 8b00 51 52 50 } // n = 7, score = 100 // 83c004 | add eax, 4 // 837c242010 | cmp dword ptr [esp + 0x20], 0x10 // 7202 | jb 4 // 8b00 | mov eax, dword ptr [eax] // 51 | push ecx // 52 | push edx // 50 | push eax $sequence_3 = { 23c3 0bc5 8b6930 03c5 8bee 059979825a 03d0 } // n = 7, score = 100 // 23c3 | and eax, ebx // 0bc5 | or eax, ebp // 8b6930 | mov ebp, dword ptr [ecx + 0x30] // 03c5 | add eax, ebp // 8bee | mov ebp, esi // 059979825a | add eax, 0x5a827999 // 03d0 | add edx, eax $sequence_4 = { 8d842434020000 64a300000000 8b84244c020000 8bac2444020000 6a04 894c2434 33db } // n = 7, score = 100 // 8d842434020000 | lea eax, dword ptr [esp + 0x234] // 64a300000000 | mov dword ptr fs:[0], eax // 8b84244c020000 | mov eax, dword ptr [esp + 0x24c] // 8bac2444020000 | mov ebp, dword ptr [esp + 0x244] // 6a04 | push 4 // 894c2434 | mov dword ptr [esp + 0x34], ecx // 33db | xor ebx, ebx $sequence_5 = { 7503 897008 8b4e04 8d4604 385924 } // n = 5, score = 100 // 7503 | jne 5 // 897008 | mov dword ptr [eax + 8], esi // 8b4e04 | mov ecx, dword ptr [esi + 4] // 8d4604 | lea eax, dword ptr [esi + 4] // 385924 | cmp byte ptr [ecx + 0x24], bl $sequence_6 = { 33cc e8???????? 83c41c c20c00 8b442434 85c0 7406 } // n = 7, score = 100 // 33cc | xor ecx, esp // e8???????? | // 83c41c | add esp, 0x1c // c20c00 | ret 0xc // 8b442434 | mov eax, dword ptr [esp + 0x34] // 85c0 | test eax, eax // 7406 | je 8 $sequence_7 = { c684442505000000 40 3bc7 7ce9 33d2 8d043f 89442410 } // n = 7, score = 100 // c684442505000000 | mov byte ptr [esp + eax*2 + 0x525], 0 // 40 | inc eax // 3bc7 | cmp eax, edi // 7ce9 | jl 0xffffffeb // 33d2 | xor edx, edx // 8d043f | lea eax, dword ptr [edi + edi] // 89442410 | mov dword ptr [esp + 0x10], eax $sequence_8 = { 03f8 85ed 7fdf 8b7c2414 c6460400 c7461001000000 e8???????? } // n = 7, score = 100 // 03f8 | add edi, eax // 85ed | test ebp, ebp // 7fdf | jg 0xffffffe1 // 8b7c2414 | mov edi, dword ptr [esp + 0x14] // c6460400 | mov byte ptr [esi + 4], 0 // c7461001000000 | mov dword ptr [esi + 0x10], 1 // e8???????? | $sequence_9 = { 8b842480000000 83c404 bf???????? 897c2470 85c0 7409 50 } // n = 7, score = 100 // 8b842480000000 | mov eax, dword ptr [esp + 0x80] // 83c404 | add esp, 4 // bf???????? | // 897c2470 | mov dword ptr [esp + 0x70], edi // 85c0 | test eax, eax // 7409 | je 0xb // 50 | push eax condition: 7 of them and filesize < 811008 }
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