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rule win_heloag_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.heloag" 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 = { f3a5 8bc8 33c0 83e103 8895d4fcffff f3a4 b940000000 } // n = 7, score = 300 // f3a5 | rep movsd dword ptr es:[edi], dword ptr [esi] // 8bc8 | mov ecx, eax // 33c0 | xor eax, eax // 83e103 | and ecx, 3 // 8895d4fcffff | mov byte ptr [ebp - 0x32c], dl // f3a4 | rep movsb byte ptr es:[edi], byte ptr [esi] // b940000000 | mov ecx, 0x40 $sequence_1 = { 53 53 8d48ff 68???????? 8bd1 } // n = 5, score = 300 // 53 | push ebx // 53 | push ebx // 8d48ff | lea ecx, [eax - 1] // 68???????? | // 8bd1 | mov edx, ecx $sequence_2 = { c1e902 f3a5 8bcb 8d95dcfeffff } // n = 4, score = 300 // c1e902 | shr ecx, 2 // f3a5 | rep movsd dword ptr es:[edi], dword ptr [esi] // 8bcb | mov ecx, ebx // 8d95dcfeffff | lea edx, [ebp - 0x124] $sequence_3 = { 68???????? f3a4 ffd3 50 } // n = 4, score = 300 // 68???????? | // f3a4 | rep movsb byte ptr es:[edi], byte ptr [esi] // ffd3 | call ebx // 50 | push eax $sequence_4 = { 83c261 52 99 f7f9 8b45ea 25ffff0000 } // n = 6, score = 300 // 83c261 | add edx, 0x61 // 52 | push edx // 99 | cdq // f7f9 | idiv ecx // 8b45ea | mov eax, dword ptr [ebp - 0x16] // 25ffff0000 | and eax, 0xffff $sequence_5 = { 8bc1 8bf7 8bfa 8d95e0faffff } // n = 4, score = 300 // 8bc1 | mov eax, ecx // 8bf7 | mov esi, edi // 8bfa | mov edi, edx // 8d95e0faffff | lea edx, [ebp - 0x520] $sequence_6 = { b909000000 be???????? bf???????? c605????????05 53 f3a5 } // n = 6, score = 300 // b909000000 | mov ecx, 9 // be???????? | // bf???????? | // c605????????05 | // 53 | push ebx // f3a5 | rep movsd dword ptr es:[edi], dword ptr [esi] $sequence_7 = { 90 a1???????? 8d4de4 51 8945fc c745dc00000000 c745e000000000 } // n = 7, score = 300 // 90 | nop // a1???????? | // 8d4de4 | lea ecx, [ebp - 0x1c] // 51 | push ecx // 8945fc | mov dword ptr [ebp - 4], eax // c745dc00000000 | mov dword ptr [ebp - 0x24], 0 // c745e000000000 | mov dword ptr [ebp - 0x20], 0 $sequence_8 = { 8a442413 6a00 8bce 8806 } // n = 4, score = 200 // 8a442413 | mov al, byte ptr [esp + 0x13] // 6a00 | push 0 // 8bce | mov ecx, esi // 8806 | mov byte ptr [esi], al $sequence_9 = { ff15???????? 8a4c2413 6a00 884c244c 8d4c244c } // n = 5, score = 200 // ff15???????? | // 8a4c2413 | mov cl, byte ptr [esp + 0x13] // 6a00 | push 0 // 884c244c | mov byte ptr [esp + 0x4c], cl // 8d4c244c | lea ecx, [esp + 0x4c] $sequence_10 = { 741f 8b7c2418 8bcb 8bd1 53 } // n = 5, score = 200 // 741f | je 0x21 // 8b7c2418 | mov edi, dword ptr [esp + 0x18] // 8bcb | mov ecx, ebx // 8bd1 | mov edx, ecx // 53 | push ebx $sequence_11 = { 53 8bcd ff15???????? 6a00 6a00 8bcd ff15???????? } // n = 7, score = 200 // 53 | push ebx // 8bcd | mov ecx, ebp // ff15???????? | // 6a00 | push 0 // 6a00 | push 0 // 8bcd | mov ecx, ebp // ff15???????? | $sequence_12 = { 8bd9 8d4c2418 53 ff15???????? 84c0 741f } // n = 6, score = 200 // 8bd9 | mov ebx, ecx // 8d4c2418 | lea ecx, [esp + 0x18] // 53 | push ebx // ff15???????? | // 84c0 | test al, al // 741f | je 0x21 $sequence_13 = { 33ed 8b7e04 8b4e0c 3bcd 8b07 89442410 7464 } // n = 7, score = 200 // 33ed | xor ebp, ebp // 8b7e04 | mov edi, dword ptr [esi + 4] // 8b4e0c | mov ecx, dword ptr [esi + 0xc] // 3bcd | cmp ecx, ebp // 8b07 | mov eax, dword ptr [edi] // 89442410 | mov dword ptr [esp + 0x10], eax // 7464 | je 0x66 $sequence_14 = { 894b0c 8a48ff fec1 8848ff eb3c } // n = 5, score = 200 // 894b0c | mov dword ptr [ebx + 0xc], ecx // 8a48ff | mov cl, byte ptr [eax - 1] // fec1 | inc cl // 8848ff | mov byte ptr [eax - 1], cl // eb3c | jmp 0x3e $sequence_15 = { a1???????? 894304 8b5608 895308 } // n = 4, score = 200 // a1???????? | // 894304 | mov dword ptr [ebx + 4], eax // 8b5608 | mov edx, dword ptr [esi + 8] // 895308 | mov dword ptr [ebx + 8], edx condition: 7 of them and filesize < 401408 }
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