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rule win_newposthings_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" 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 = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { c78534feffff00000000 c68524feffff00 c645fc00 83bd54feffff10 720e ffb540feffff e8???????? } // n = 7, score = 100 // c78534feffff00000000 | mov dword ptr [ebp - 0x1cc], 0 // c68524feffff00 | mov byte ptr [ebp - 0x1dc], 0 // c645fc00 | mov byte ptr [ebp - 4], 0 // 83bd54feffff10 | cmp dword ptr [ebp - 0x1ac], 0x10 // 720e | jb 0x10 // ffb540feffff | push dword ptr [ebp - 0x1c0] // e8???????? | $sequence_1 = { ff75d4 e8???????? 8bf8 83c404 85ff 7528 50 } // n = 7, score = 100 // ff75d4 | push dword ptr [ebp - 0x2c] // e8???????? | // 8bf8 | mov edi, eax // 83c404 | add esp, 4 // 85ff | test edi, edi // 7528 | jne 0x2a // 50 | push eax $sequence_2 = { 6a02 c78578ffffff00000000 c7857cffffff00000000 68e0c40110 8d8d68ffffff } // n = 5, score = 100 // 6a02 | push 2 // c78578ffffff00000000 | mov dword ptr [ebp - 0x88], 0 // c7857cffffff00000000 | mov dword ptr [ebp - 0x84], 0 // 68e0c40110 | push 0x1001c4e0 // 8d8d68ffffff | lea ecx, [ebp - 0x98] $sequence_3 = { c741140f000000 c7411000000000 50 c60100 e8???????? c645fc02 83ec18 } // n = 7, score = 100 // c741140f000000 | mov dword ptr [ecx + 0x14], 0xf // c7411000000000 | mov dword ptr [ecx + 0x10], 0 // 50 | push eax // c60100 | mov byte ptr [ecx], 0 // e8???????? | // c645fc02 | mov byte ptr [ebp - 4], 2 // 83ec18 | sub esp, 0x18 $sequence_4 = { 83c408 85ff 7531 ffb5f4fcffff 68e8030000 56 e8???????? } // n = 7, score = 100 // 83c408 | add esp, 8 // 85ff | test edi, edi // 7531 | jne 0x33 // ffb5f4fcffff | push dword ptr [ebp - 0x30c] // 68e8030000 | push 0x3e8 // 56 | push esi // e8???????? | $sequence_5 = { 833d????????10 722e 56 8b35???????? 8d4dff e8???????? 6848110210 } // n = 7, score = 100 // 833d????????10 | // 722e | jb 0x30 // 56 | push esi // 8b35???????? | // 8d4dff | lea ecx, [ebp - 1] // e8???????? | // 6848110210 | push 0x10021148 $sequence_6 = { 64a300000000 8bf1 8975f0 c745fc01000000 8d4e04 c741140f000000 c7411000000000 } // n = 7, score = 100 // 64a300000000 | mov dword ptr fs:[0], eax // 8bf1 | mov esi, ecx // 8975f0 | mov dword ptr [ebp - 0x10], esi // c745fc01000000 | mov dword ptr [ebp - 4], 1 // 8d4e04 | lea ecx, [esi + 4] // c741140f000000 | mov dword ptr [ecx + 0x14], 0xf // c7411000000000 | mov dword ptr [ecx + 0x10], 0 $sequence_7 = { 83fe14 7250 83ec18 8bcc 89658c 6aff } // n = 6, score = 100 // 83fe14 | cmp esi, 0x14 // 7250 | jb 0x52 // 83ec18 | sub esp, 0x18 // 8bcc | mov ecx, esp // 89658c | mov dword ptr [ebp - 0x74], esp // 6aff | push -1 $sequence_8 = { 8d842480010000 64a300000000 8bf9 68c8200210 ff15???????? 6804010000 8d442470 } // n = 7, score = 100 // 8d842480010000 | lea eax, [esp + 0x180] // 64a300000000 | mov dword ptr fs:[0], eax // 8bf9 | mov edi, ecx // 68c8200210 | push 0x100220c8 // ff15???????? | // 6804010000 | push 0x104 // 8d442470 | lea eax, [esp + 0x70] $sequence_9 = { c78500ffffff00000000 c685f0feffff00 c645fc15 83bdb8feffff10 720e ffb5a4feffff } // n = 6, score = 100 // c78500ffffff00000000 | mov dword ptr [ebp - 0x100], 0 // c685f0feffff00 | mov byte ptr [ebp - 0x110], 0 // c645fc15 | mov byte ptr [ebp - 4], 0x15 // 83bdb8feffff10 | cmp dword ptr [ebp - 0x148], 0x10 // 720e | jb 0x10 // ffb5a4feffff | push dword ptr [ebp - 0x15c] condition: 7 of them and filesize < 827392 }
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