Actor(s): EMISSARY PANDA
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rule win_polpo_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.polpo." 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.polpo" malpedia_rule_date = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { 7ceb 6a00 8d855cebffff 50 56 8d8d64ebffff 51 } // n = 7, score = 100 // 7ceb | jl 0xffffffed // 6a00 | push 0 // 8d855cebffff | lea eax, [ebp - 0x14a4] // 50 | push eax // 56 | push esi // 8d8d64ebffff | lea ecx, [ebp - 0x149c] // 51 | push ecx $sequence_1 = { e8???????? 894610 8d45bc 50 8bcf e8???????? 8b4f08 } // n = 7, score = 100 // e8???????? | // 894610 | mov dword ptr [esi + 0x10], eax // 8d45bc | lea eax, [ebp - 0x44] // 50 | push eax // 8bcf | mov ecx, edi // e8???????? | // 8b4f08 | mov ecx, dword ptr [edi + 8] $sequence_2 = { 83feff 0f8442010000 6800040000 8d8decfbffff 6a00 51 e8???????? } // n = 7, score = 100 // 83feff | cmp esi, -1 // 0f8442010000 | je 0x148 // 6800040000 | push 0x400 // 8d8decfbffff | lea ecx, [ebp - 0x414] // 6a00 | push 0 // 51 | push ecx // e8???????? | $sequence_3 = { 85ff 7527 8b4db8 51 } // n = 4, score = 100 // 85ff | test edi, edi // 7527 | jne 0x29 // 8b4db8 | mov ecx, dword ptr [ebp - 0x48] // 51 | push ecx $sequence_4 = { 8d85e8f7ffff 50 8d8decf7ffff 51 c785e8f7ffff00000000 e8???????? 6800040000 } // n = 7, score = 100 // 8d85e8f7ffff | lea eax, [ebp - 0x818] // 50 | push eax // 8d8decf7ffff | lea ecx, [ebp - 0x814] // 51 | push ecx // c785e8f7ffff00000000 | mov dword ptr [ebp - 0x818], 0 // e8???????? | // 6800040000 | push 0x400 $sequence_5 = { 68???????? e8???????? 8bf0 83c41c 83feff 0f8413ffffff 6a00 } // n = 7, score = 100 // 68???????? | // e8???????? | // 8bf0 | mov esi, eax // 83c41c | add esp, 0x1c // 83feff | cmp esi, -1 // 0f8413ffffff | je 0xffffff19 // 6a00 | push 0 $sequence_6 = { 668945e9 8845eb c745f450726f78 c645f879 } // n = 4, score = 100 // 668945e9 | mov word ptr [ebp - 0x17], ax // 8845eb | mov byte ptr [ebp - 0x15], al // c745f450726f78 | mov dword ptr [ebp - 0xc], 0x786f7250 // c645f879 | mov byte ptr [ebp - 8], 0x79 $sequence_7 = { 8d951ee7ffff 33c9 57 52 66898d1ce7ffff e8???????? 83c40c } // n = 7, score = 100 // 8d951ee7ffff | lea edx, [ebp - 0x18e2] // 33c9 | xor ecx, ecx // 57 | push edi // 52 | push edx // 66898d1ce7ffff | mov word ptr [ebp - 0x18e4], cx // e8???????? | // 83c40c | add esp, 0xc $sequence_8 = { e8???????? 83c410 83f8ff 74ca 8bc8 2bce 81f980000000 } // n = 7, score = 100 // e8???????? | // 83c410 | add esp, 0x10 // 83f8ff | cmp eax, -1 // 74ca | je 0xffffffcc // 8bc8 | mov ecx, eax // 2bce | sub ecx, esi // 81f980000000 | cmp ecx, 0x80 $sequence_9 = { 50 6800000080 ffd3 85c0 7414 } // n = 5, score = 100 // 50 | push eax // 6800000080 | push 0x80000000 // ffd3 | call ebx // 85c0 | test eax, eax // 7414 | je 0x16 condition: 7 of them and filesize < 250880 }
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