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rule win_newposthings_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" version = "1" description = "Detects win.newposthings." 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.newposthings" malpedia_rule_date = "20220513" malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26" malpedia_version = "20220516" 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 = { 6a10 68c8d30110 e8???????? 33ff } // n = 4, score = 100 // 6a10 | push 0x10 // 68c8d30110 | push 0x1001d3c8 // e8???????? | // 33ff | xor edi, edi $sequence_1 = { 53 66a3???????? ff15???????? befb020000 85c0 751b 68108d0110 } // n = 7, score = 100 // 53 | push ebx // 66a3???????? | // ff15???????? | // befb020000 | mov esi, 0x2fb // 85c0 | test eax, eax // 751b | jne 0x1d // 68108d0110 | push 0x10018d10 $sequence_2 = { c78538feffff0f000000 c78534feffff00000000 c68524feffff00 e8???????? 8b35???????? 83c40c c78558feffffc8000000 } // n = 7, score = 100 // c78538feffff0f000000 | mov dword ptr [ebp - 0x1c8], 0xf // c78534feffff00000000 | mov dword ptr [ebp - 0x1cc], 0 // c68524feffff00 | mov byte ptr [ebp - 0x1dc], 0 // e8???????? | // 8b35???????? | // 83c40c | add esp, 0xc // c78558feffffc8000000 | mov dword ptr [ebp - 0x1a8], 0xc8 $sequence_3 = { 6a00 50 ffb574ffffff 51 ff15???????? 8bc8 890b } // n = 7, score = 100 // 6a00 | push 0 // 50 | push eax // ffb574ffffff | push dword ptr [ebp - 0x8c] // 51 | push ecx // ff15???????? | // 8bc8 | mov ecx, eax // 890b | mov dword ptr [ebx], ecx $sequence_4 = { c645fc0d 83bd7cffffff10 720e ffb568ffffff } // n = 4, score = 100 // c645fc0d | mov byte ptr [ebp - 4], 0xd // 83bd7cffffff10 | cmp dword ptr [ebp - 0x84], 0x10 // 720e | jb 0x10 // ffb568ffffff | push dword ptr [ebp - 0x98] $sequence_5 = { 6894c60110 ffb53cfeffff ffd7 85c0 0f85b9000000 898534feffff 898538feffff } // n = 7, score = 100 // 6894c60110 | push 0x1001c694 // ffb53cfeffff | push dword ptr [ebp - 0x1c4] // ffd7 | call edi // 85c0 | test eax, eax // 0f85b9000000 | jne 0xbf // 898534feffff | mov dword ptr [ebp - 0x1cc], eax // 898538feffff | mov dword ptr [ebp - 0x1c8], eax $sequence_6 = { 6a00 b947000000 be???????? f3a5 6a02 6a00 6a00 } // n = 7, score = 100 // 6a00 | push 0 // b947000000 | mov ecx, 0x47 // be???????? | // f3a5 | rep movsd dword ptr es:[edi], dword ptr [esi] // 6a02 | push 2 // 6a00 | push 0 // 6a00 | push 0 $sequence_7 = { 8b3d???????? 8b1d???????? 8bff 68c0270900 ffd6 833d????????00 74f0 } // n = 7, score = 100 // 8b3d???????? | // 8b1d???????? | // 8bff | mov edi, edi // 68c0270900 | push 0x927c0 // ffd6 | call esi // 833d????????00 | // 74f0 | je 0xfffffff2 $sequence_8 = { 64a300000000 8bf1 8975f0 c745fcffffffff f6450801 c706947f0110 7409 } // n = 7, score = 100 // 64a300000000 | mov dword ptr fs:[0], eax // 8bf1 | mov esi, ecx // 8975f0 | mov dword ptr [ebp - 0x10], esi // c745fcffffffff | mov dword ptr [ebp - 4], 0xffffffff // f6450801 | test byte ptr [ebp + 8], 1 // c706947f0110 | mov dword ptr [esi], 0x10017f94 // 7409 | je 0xb $sequence_9 = { 8934fd58654100 eb07 56 e8???????? 59 c745fcfeffffff e8???????? } // n = 7, score = 100 // 8934fd58654100 | mov dword ptr [edi*8 + 0x416558], esi // eb07 | jmp 9 // 56 | push esi // e8???????? | // 59 | pop ecx // c745fcfeffffff | mov dword ptr [ebp - 4], 0xfffffffe // e8???????? | condition: 7 of them and filesize < 827392 }
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