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rule win_heyoka_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.heyoka." 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.heyoka" malpedia_rule_date = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = { 8b4d0c 8b510c 83c204 52 8b45fc 50 } // n = 6, score = 100 // 8b4d0c | mov ecx, dword ptr [ebp + 0xc] // 8b510c | mov edx, dword ptr [ecx + 0xc] // 83c204 | add edx, 4 // 52 | push edx // 8b45fc | mov eax, dword ptr [ebp - 4] // 50 | push eax $sequence_1 = { c745f800000000 c745f000000000 c745f400000000 c745ec00000000 8b4514 6bc005 c1e803 } // n = 7, score = 100 // c745f800000000 | mov dword ptr [ebp - 8], 0 // c745f000000000 | mov dword ptr [ebp - 0x10], 0 // c745f400000000 | mov dword ptr [ebp - 0xc], 0 // c745ec00000000 | mov dword ptr [ebp - 0x14], 0 // 8b4514 | mov eax, dword ptr [ebp + 0x14] // 6bc005 | imul eax, eax, 5 // c1e803 | shr eax, 3 $sequence_2 = { 8b45dc 50 e8???????? 83c410 8945d8 837dd800 750c } // n = 7, score = 100 // 8b45dc | mov eax, dword ptr [ebp - 0x24] // 50 | push eax // e8???????? | // 83c410 | add esp, 0x10 // 8945d8 | mov dword ptr [ebp - 0x28], eax // 837dd800 | cmp dword ptr [ebp - 0x28], 0 // 750c | jne 0xe $sequence_3 = { 83ec08 894df8 8b45f8 c700???????? 8b4df8 c7810c09000000000000 8b55f8 } // n = 7, score = 100 // 83ec08 | sub esp, 8 // 894df8 | mov dword ptr [ebp - 8], ecx // 8b45f8 | mov eax, dword ptr [ebp - 8] // c700???????? | // 8b4df8 | mov ecx, dword ptr [ebp - 8] // c7810c09000000000000 | mov dword ptr [ecx + 0x90c], 0 // 8b55f8 | mov edx, dword ptr [ebp - 8] $sequence_4 = { e8???????? 83c408 8b5518 52 8b45dc 83c004 } // n = 6, score = 100 // e8???????? | // 83c408 | add esp, 8 // 8b5518 | mov edx, dword ptr [ebp + 0x18] // 52 | push edx // 8b45dc | mov eax, dword ptr [ebp - 0x24] // 83c004 | add eax, 4 $sequence_5 = { e8???????? 83c408 eb17 837d0803 7511 68???????? } // n = 6, score = 100 // e8???????? | // 83c408 | add esp, 8 // eb17 | jmp 0x19 // 837d0803 | cmp dword ptr [ebp + 8], 3 // 7511 | jne 0x13 // 68???????? | $sequence_6 = { 8bec 83ec08 8b4508 50 6a01 e8???????? 83c408 } // n = 7, score = 100 // 8bec | mov ebp, esp // 83ec08 | sub esp, 8 // 8b4508 | mov eax, dword ptr [ebp + 8] // 50 | push eax // 6a01 | push 1 // e8???????? | // 83c408 | add esp, 8 $sequence_7 = { 7423 8bce 8bc6 c1f905 83e01f 8b0c8da0d80110 } // n = 6, score = 100 // 7423 | je 0x25 // 8bce | mov ecx, esi // 8bc6 | mov eax, esi // c1f905 | sar ecx, 5 // 83e01f | and eax, 0x1f // 8b0c8da0d80110 | mov ecx, dword ptr [ecx*4 + 0x1001d8a0] $sequence_8 = { 51 e8???????? 83c404 8b45e0 83c00c 8be5 } // n = 6, score = 100 // 51 | push ecx // e8???????? | // 83c404 | add esp, 4 // 8b45e0 | mov eax, dword ptr [ebp - 0x20] // 83c00c | add eax, 0xc // 8be5 | mov esp, ebp $sequence_9 = { 8955f8 8b45fc 8b4df4 8b55f8 0faf948134e30000 8b4df4 8bc2 } // n = 7, score = 100 // 8955f8 | mov dword ptr [ebp - 8], edx // 8b45fc | mov eax, dword ptr [ebp - 4] // 8b4df4 | mov ecx, dword ptr [ebp - 0xc] // 8b55f8 | mov edx, dword ptr [ebp - 8] // 0faf948134e30000 | imul edx, dword ptr [ecx + eax*4 + 0xe334] // 8b4df4 | mov ecx, dword ptr [ebp - 0xc] // 8bc2 | mov eax, edx condition: 7 of them and filesize < 270336 }
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