Actor(s): UPS
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rule win_shareip_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "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 = { c1fa03 8bca c1e91f 03ca 8b7710 8bd6 2bd3 } // n = 7, score = 100 // c1fa03 | sar edx, 3 // 8bca | mov ecx, edx // c1e91f | shr ecx, 0x1f // 03ca | add ecx, edx // 8b7710 | mov esi, dword ptr [edi + 0x10] // 8bd6 | mov edx, esi // 2bd3 | sub edx, ebx $sequence_1 = { e9???????? 8d85d4fdffff e9???????? 8d8d68feffff e9???????? } // n = 5, score = 100 // e9???????? | // 8d85d4fdffff | lea eax, [ebp - 0x22c] // e9???????? | // 8d8d68feffff | lea ecx, [ebp - 0x198] // e9???????? | $sequence_2 = { 57 a1???????? 33c4 50 8d842498210000 64a300000000 8b8424ac210000 } // n = 7, score = 100 // 57 | push edi // a1???????? | // 33c4 | xor eax, esp // 50 | push eax // 8d842498210000 | lea eax, [esp + 0x2198] // 64a300000000 | mov dword ptr fs:[0], eax // 8b8424ac210000 | mov eax, dword ptr [esp + 0x21ac] $sequence_3 = { 8d8424fc000000 50 8bce c684248c01000002 e8???????? 85c0 7443 } // n = 7, score = 100 // 8d8424fc000000 | lea eax, [esp + 0xfc] // 50 | push eax // 8bce | mov ecx, esi // c684248c01000002 | mov byte ptr [esp + 0x18c], 2 // e8???????? | // 85c0 | test eax, eax // 7443 | je 0x45 $sequence_4 = { 7208 8b4130 668b4002 c3 c741140b000000 } // n = 5, score = 100 // 7208 | jb 0xa // 8b4130 | mov eax, dword ptr [ecx + 0x30] // 668b4002 | mov ax, word ptr [eax + 2] // c3 | ret // c741140b000000 | mov dword ptr [ecx + 0x14], 0xb $sequence_5 = { e8???????? 83c404 84c0 0f8462010000 6a00 e8???????? 83c404 } // n = 7, score = 100 // e8???????? | // 83c404 | add esp, 4 // 84c0 | test al, al // 0f8462010000 | je 0x168 // 6a00 | push 0 // e8???????? | // 83c404 | add esp, 4 $sequence_6 = { 8b35???????? ffd6 8b542414 52 ffd6 8b442410 3d12030900 } // n = 7, score = 100 // 8b35???????? | // ffd6 | call esi // 8b542414 | mov edx, dword ptr [esp + 0x14] // 52 | push edx // ffd6 | call esi // 8b442410 | mov eax, dword ptr [esp + 0x10] // 3d12030900 | cmp eax, 0x90312 $sequence_7 = { 51 8bce c684248000000001 e8???????? 56 8d442410 } // n = 6, score = 100 // 51 | push ecx // 8bce | mov ecx, esi // c684248000000001 | mov byte ptr [esp + 0x80], 1 // e8???????? | // 56 | push esi // 8d442410 | lea eax, [esp + 0x10] $sequence_8 = { 0fb75308 83ea18 89561c 8bc6 8b4c2408 64890d00000000 } // n = 6, score = 100 // 0fb75308 | movzx edx, word ptr [ebx + 8] // 83ea18 | sub edx, 0x18 // 89561c | mov dword ptr [esi + 0x1c], edx // 8bc6 | mov eax, esi // 8b4c2408 | mov ecx, dword ptr [esp + 8] // 64890d00000000 | mov dword ptr fs:[0], ecx $sequence_9 = { 8b10 8d4c2464 ffd2 8b842480000000 6a00 e8???????? 8bf0 } // n = 7, score = 100 // 8b10 | mov edx, dword ptr [eax] // 8d4c2464 | lea ecx, [esp + 0x64] // ffd2 | call edx // 8b842480000000 | mov eax, dword ptr [esp + 0x80] // 6a00 | push 0 // e8???????? | // 8bf0 | mov esi, eax condition: 7 of them and filesize < 811008 }
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