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rule win_pykspa_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-12-22" version = "1" description = "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.pykspa" malpedia_rule_date = "20201222" malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130" malpedia_version = "20201023" 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 = { 84c0 745d 8a4564 3a4570 7555 6a01 e8???????? } // n = 7, score = 100 // 84c0 | test al, al // 745d | je 0x5f // 8a4564 | mov al, byte ptr [ebp + 0x64] // 3a4570 | cmp al, byte ptr [ebp + 0x70] // 7555 | jne 0x57 // 6a01 | push 1 // e8???????? | $sequence_1 = { e9???????? 68???????? 57 ffd6 85c0 7509 c6457302 } // n = 7, score = 100 // e9???????? | // 68???????? | // 57 | push edi // ffd6 | call esi // 85c0 | test eax, eax // 7509 | jne 0xb // c6457302 | mov byte ptr [ebp + 0x73], 2 $sequence_2 = { e8???????? 8b5508 8b7f04 83c410 85d2 8d0cbb 7e16 } // n = 7, score = 100 // e8???????? | // 8b5508 | mov edx, dword ptr [ebp + 8] // 8b7f04 | mov edi, dword ptr [edi + 4] // 83c410 | add esp, 0x10 // 85d2 | test edx, edx // 8d0cbb | lea ecx, [ebx + edi*4] // 7e16 | jle 0x18 $sequence_3 = { ab ab 66ab be???????? 8d7de0 66a5 a4 } // n = 7, score = 100 // ab | stosd dword ptr es:[edi], eax // ab | stosd dword ptr es:[edi], eax // 66ab | stosw word ptr es:[edi], ax // be???????? | // 8d7de0 | lea edi, [ebp - 0x20] // 66a5 | movsw word ptr es:[edi], word ptr [esi] // a4 | movsb byte ptr es:[edi], byte ptr [esi] $sequence_4 = { 3819 75d2 3819 7416 0fb608 f681214e460004 } // n = 6, score = 100 // 3819 | cmp byte ptr [ecx], bl // 75d2 | jne 0xffffffd4 // 3819 | cmp byte ptr [ecx], bl // 7416 | je 0x18 // 0fb608 | movzx ecx, byte ptr [eax] // f681214e460004 | test byte ptr [ecx + 0x464e21], 4 $sequence_5 = { 6880000000 6a01 6a01 57 ff35???????? 6a01 56 } // n = 7, score = 100 // 6880000000 | push 0x80 // 6a01 | push 1 // 6a01 | push 1 // 57 | push edi // ff35???????? | // 6a01 | push 1 // 56 | push esi $sequence_6 = { 84c0 59 0f84b8000000 8b4718 ff700c 8d44241c 50 } // n = 7, score = 100 // 84c0 | test al, al // 59 | pop ecx // 0f84b8000000 | je 0xbe // 8b4718 | mov eax, dword ptr [edi + 0x18] // ff700c | push dword ptr [eax + 0xc] // 8d44241c | lea eax, [esp + 0x1c] // 50 | push eax $sequence_7 = { 803d????????00 7558 803d????????00 7465 a1???????? 894508 a1???????? } // n = 7, score = 100 // 803d????????00 | // 7558 | jne 0x5a // 803d????????00 | // 7465 | je 0x67 // a1???????? | // 894508 | mov dword ptr [ebp + 8], eax // a1???????? | $sequence_8 = { e8???????? 83c40c 85c0 7507 68???????? ebde } // n = 6, score = 100 // e8???????? | // 83c40c | add esp, 0xc // 85c0 | test eax, eax // 7507 | jne 9 // 68???????? | // ebde | jmp 0xffffffe0 $sequence_9 = { 50 ffd6 8d45b4 50 8d85acfeffff 50 ffd6 } // n = 7, score = 100 // 50 | push eax // ffd6 | call esi // 8d45b4 | lea eax, [ebp - 0x4c] // 50 | push eax // 8d85acfeffff | lea eax, [ebp - 0x154] // 50 | push eax // ffd6 | call esi condition: 7 of them and filesize < 835584 }
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