Actor(s): EMISSARY PANDA
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rule win_polpo_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "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 = { 8d85dcfbffff 50 e8???????? 8bf8 83c410 83ffff 0f845e020000 } // n = 7, score = 100 // 8d85dcfbffff | lea eax, [ebp - 0x424] // 50 | push eax // e8???????? | // 8bf8 | mov edi, eax // 83c410 | add esp, 0x10 // 83ffff | cmp edi, -1 // 0f845e020000 | je 0x264 $sequence_1 = { e8???????? 83c404 8906 8b55bc 895604 8d45c4 8d4801 } // n = 7, score = 100 // e8???????? | // 83c404 | add esp, 4 // 8906 | mov dword ptr [esi], eax // 8b55bc | mov edx, dword ptr [ebp - 0x44] // 895604 | mov dword ptr [esi + 4], edx // 8d45c4 | lea eax, [ebp - 0x3c] // 8d4801 | lea ecx, [eax + 1] $sequence_2 = { 68???????? 51 c785f8faffff00000000 e8???????? 8bf0 83c410 83feff } // n = 7, score = 100 // 68???????? | // 51 | push ecx // c785f8faffff00000000 | mov dword ptr [ebp - 0x508], 0 // e8???????? | // 8bf0 | mov esi, eax // 83c410 | add esp, 0x10 // 83feff | cmp esi, -1 $sequence_3 = { ff15???????? 6880010000 6a00 ff15???????? 50 ff15???????? 6a00 } // n = 7, score = 100 // ff15???????? | // 6880010000 | push 0x180 // 6a00 | push 0 // ff15???????? | // 50 | push eax // ff15???????? | // 6a00 | push 0 $sequence_4 = { 8bf8 83c410 83ffff 0f845e020000 6800040000 8d8ddcfbffff 6a00 } // n = 7, score = 100 // 8bf8 | mov edi, eax // 83c410 | add esp, 0x10 // 83ffff | cmp edi, -1 // 0f845e020000 | je 0x264 // 6800040000 | push 0x400 // 8d8ddcfbffff | lea ecx, [ebp - 0x424] // 6a00 | push 0 $sequence_5 = { 89b500faffff 6689850cfaffff e8???????? 6808020000 8d95f4fdffff 6a00 52 } // n = 7, score = 100 // 89b500faffff | mov dword ptr [ebp - 0x600], esi // 6689850cfaffff | mov word ptr [ebp - 0x5f4], ax // e8???????? | // 6808020000 | push 0x208 // 8d95f4fdffff | lea edx, [ebp - 0x20c] // 6a00 | push 0 // 52 | push edx $sequence_6 = { c645fc01 e8???????? 83c404 8d8d4cfdffff 899d48fdffff } // n = 5, score = 100 // c645fc01 | mov byte ptr [ebp - 4], 1 // e8???????? | // 83c404 | add esp, 4 // 8d8d4cfdffff | lea ecx, [ebp - 0x2b4] // 899d48fdffff | mov dword ptr [ebp - 0x2b8], ebx $sequence_7 = { 8945fc 56 57 6a00 6a00 6a04 } // n = 6, score = 100 // 8945fc | mov dword ptr [ebp - 4], eax // 56 | push esi // 57 | push edi // 6a00 | push 0 // 6a00 | push 0 // 6a04 | push 4 $sequence_8 = { 668985d4fdffff e8???????? 8b16 83c40c 83c604 56 8d85d4fdffff } // n = 7, score = 100 // 668985d4fdffff | mov word ptr [ebp - 0x22c], ax // e8???????? | // 8b16 | mov edx, dword ptr [esi] // 83c40c | add esp, 0xc // 83c604 | add esi, 4 // 56 | push esi // 8d85d4fdffff | lea eax, [ebp - 0x22c] $sequence_9 = { ff15???????? 6a00 6800040000 8d8ddcfbffff 68???????? 51 } // n = 6, score = 100 // ff15???????? | // 6a00 | push 0 // 6800040000 | push 0x400 // 8d8ddcfbffff | lea ecx, [ebp - 0x424] // 68???????? | // 51 | push ecx condition: 7 of them and filesize < 250880 }
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