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rule win_harnig_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-08-05" version = "1" description = "Detects win.harnig." 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.harnig" malpedia_rule_date = "20220805" malpedia_hash = "6ec06c64bcfdbeda64eff021c766b4ce34542b71" malpedia_version = "20220808" 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 = { 52 50 ff512c 85c0 7404 } // n = 5, score = 100 // 52 | push edx // 50 | push eax // ff512c | call dword ptr [ecx + 0x2c] // 85c0 | test eax, eax // 7404 | je 6 $sequence_1 = { 8d85e0fdffff 50 ffd3 6a03 } // n = 4, score = 100 // 8d85e0fdffff | lea eax, [ebp - 0x220] // 50 | push eax // ffd3 | call ebx // 6a03 | push 3 $sequence_2 = { 50 8d85e0feffff 50 ffd3 8d85e0feffff 50 } // n = 6, score = 100 // 50 | push eax // 8d85e0feffff | lea eax, [ebp - 0x120] // 50 | push eax // ffd3 | call ebx // 8d85e0feffff | lea eax, [ebp - 0x120] // 50 | push eax $sequence_3 = { e8???????? 6a05 bf???????? 57 } // n = 4, score = 100 // e8???????? | // 6a05 | push 5 // bf???????? | // 57 | push edi $sequence_4 = { 03f9 03d9 837e1800 7620 8b4508 } // n = 5, score = 100 // 03f9 | add edi, ecx // 03d9 | add ebx, ecx // 837e1800 | cmp dword ptr [esi + 0x18], 0 // 7620 | jbe 0x22 // 8b4508 | mov eax, dword ptr [ebp + 8] $sequence_5 = { 8b7c2410 33c0 8a07 47 50 e8???????? } // n = 6, score = 100 // 8b7c2410 | mov edi, dword ptr [esp + 0x10] // 33c0 | xor eax, eax // 8a07 | mov al, byte ptr [edi] // 47 | inc edi // 50 | push eax // e8???????? | $sequence_6 = { 56 8d85e0fbffff 50 ffd7 } // n = 4, score = 100 // 56 | push esi // 8d85e0fbffff | lea eax, [ebp - 0x420] // 50 | push eax // ffd7 | call edi $sequence_7 = { c1e810 03f1 6685c0 7509 } // n = 4, score = 100 // c1e810 | shr eax, 0x10 // 03f1 | add esi, ecx // 6685c0 | test ax, ax // 7509 | jne 0xb $sequence_8 = { 6a04 e8???????? 57 8d8dbcfeffff 51 } // n = 5, score = 100 // 6a04 | push 4 // e8???????? | // 57 | push edi // 8d8dbcfeffff | lea ecx, [ebp - 0x144] // 51 | push ecx $sequence_9 = { e8???????? 6a08 48 59 2b4c240c } // n = 5, score = 100 // e8???????? | // 6a08 | push 8 // 48 | dec eax // 59 | pop ecx // 2b4c240c | sub ecx, dword ptr [esp + 0xc] condition: 7 of them and filesize < 49152 }
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