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rule win_killav_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.killav." 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.killav" 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 = { 660f122c8568144300 03c0 660f28348580184300 ba7f3e0400 e9???????? 8bd0 81e2ffffff7f } // n = 7, score = 100 // 660f122c8568144300 | movlpd xmm5, qword ptr [eax*4 + 0x431468] // 03c0 | add eax, eax // 660f28348580184300 | movapd xmm6, xmmword ptr [eax*4 + 0x431880] // ba7f3e0400 | mov edx, 0x43e7f // e9???????? | // 8bd0 | mov edx, eax // 81e2ffffff7f | and edx, 0x7fffffff $sequence_1 = { c645fc05 50 8d4dd0 e8???????? c645fc00 } // n = 5, score = 100 // c645fc05 | mov byte ptr [ebp - 4], 5 // 50 | push eax // 8d4dd0 | lea ecx, [ebp - 0x30] // e8???????? | // c645fc00 | mov byte ptr [ebp - 4], 0 $sequence_2 = { c745e800000000 c745ec07000000 668945d8 e8???????? 8d45d8 c645fc2f 50 } // n = 7, score = 100 // c745e800000000 | mov dword ptr [ebp - 0x18], 0 // c745ec07000000 | mov dword ptr [ebp - 0x14], 7 // 668945d8 | mov word ptr [ebp - 0x28], ax // e8???????? | // 8d45d8 | lea eax, [ebp - 0x28] // c645fc2f | mov byte ptr [ebp - 4], 0x2f // 50 | push eax $sequence_3 = { 40 e9???????? 8365c000 c745c46ecb4000 a1???????? 8d4dc0 } // n = 6, score = 100 // 40 | inc eax // e9???????? | // 8365c000 | and dword ptr [ebp - 0x40], 0 // c745c46ecb4000 | mov dword ptr [ebp - 0x3c], 0x40cb6e // a1???????? | // 8d4dc0 | lea ecx, [ebp - 0x40] $sequence_4 = { 668945d8 e8???????? 8d45d8 c645fc11 50 8d4dd0 } // n = 6, score = 100 // 668945d8 | mov word ptr [ebp - 0x28], ax // e8???????? | // 8d45d8 | lea eax, [ebp - 0x28] // c645fc11 | mov byte ptr [ebp - 4], 0x11 // 50 | push eax // 8d4dd0 | lea ecx, [ebp - 0x30] $sequence_5 = { c7443090d4604300 8b4690 8b4804 8d4190 8944318c 8d4ea0 } // n = 6, score = 100 // c7443090d4604300 | mov dword ptr [eax + esi - 0x70], 0x4360d4 // 8b4690 | mov eax, dword ptr [esi - 0x70] // 8b4804 | mov ecx, dword ptr [eax + 4] // 8d4190 | lea eax, [ecx - 0x70] // 8944318c | mov dword ptr [ecx + esi - 0x74], eax // 8d4ea0 | lea ecx, [esi - 0x60] $sequence_6 = { e8???????? 8d45d8 c645fc33 50 8d4dd0 } // n = 5, score = 100 // e8???????? | // 8d45d8 | lea eax, [ebp - 0x28] // c645fc33 | mov byte ptr [ebp - 4], 0x33 // 50 | push eax // 8d4dd0 | lea ecx, [ebp - 0x30] $sequence_7 = { 894df4 8955ec 8b04bd70ba4300 e9???????? 8bc1 f7d0 a801 } // n = 7, score = 100 // 894df4 | mov dword ptr [ebp - 0xc], ecx // 8955ec | mov dword ptr [ebp - 0x14], edx // 8b04bd70ba4300 | mov eax, dword ptr [edi*4 + 0x43ba70] // e9???????? | // 8bc1 | mov eax, ecx // f7d0 | not eax // a801 | test al, 1 $sequence_8 = { c645fc15 50 8d4dd0 e8???????? c645fc00 } // n = 5, score = 100 // c645fc15 | mov byte ptr [ebp - 4], 0x15 // 50 | push eax // 8d4dd0 | lea ecx, [ebp - 0x30] // e8???????? | // c645fc00 | mov byte ptr [ebp - 4], 0 $sequence_9 = { 8b4508 dd00 ebc2 c745e40ce34200 eb19 c745e414e34200 } // n = 6, score = 100 // 8b4508 | mov eax, dword ptr [ebp + 8] // dd00 | fld qword ptr [eax] // ebc2 | jmp 0xffffffc4 // c745e40ce34200 | mov dword ptr [ebp - 0x1c], 0x42e30c // eb19 | jmp 0x1b // c745e414e34200 | mov dword ptr [ebp - 0x1c], 0x42e314 condition: 7 of them and filesize < 517120 }
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