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rule win_virtualgate_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.virtualgate." 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.virtualgate" 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 = { ffc3 895d9b 428844f13e 4b8b84e0f0250200 42804cf03d04 38558f } // n = 6, score = 100 // ffc3 | cmp eax, -1 // 895d9b | jne 0x397 // 428844f13e | mov edx, eax // 4b8b84e0f0250200 | dec eax // 42804cf03d04 | mov ecx, ebx // 38558f | test eax, eax $sequence_1 = { 8bc3 488b5c2450 488b742460 4883c430 415e 415c 5f } // n = 7, score = 100 // 8bc3 | dec eax // 488b5c2450 | mov esi, edx // 488b742460 | inc ecx // 4883c430 | push esi // 415e | inc ecx // 415c | push edi // 5f | dec eax $sequence_2 = { 460fbebc3920190200 41ffc7 458bef 442bea 4d63dd 4d3bd8 0f8f68020000 } // n = 7, score = 100 // 460fbebc3920190200 | cmp edx, ecx // 41ffc7 | je 0x28e // 458bef | mov al, byte ptr [ecx] // 442bea | test al, al // 4d63dd | je 0x2aa // 4d3bd8 | dec eax // 0f8f68020000 | inc edx $sequence_3 = { 488bc8 4c896c2438 4c896c2430 44896c2428 c744242001000000 e8???????? 85c0 } // n = 7, score = 100 // 488bc8 | lea eax, [0xcfb7] // 4c896c2438 | dec esp // 4c896c2430 | lea ecx, [0xd2ed] // 44896c2428 | xor ecx, ecx // c744242001000000 | dec esp // e8???????? | // 85c0 | lea eax, [0xd2e0] $sequence_4 = { 4c8b45b7 4c2bc6 420fb64cf03e 460fbebc3920190200 41ffc7 458bef 442bea } // n = 7, score = 100 // 4c8b45b7 | dec eax // 4c2bc6 | lea ecx, [0x1f933] // 420fb64cf03e | dec eax // 460fbebc3920190200 | mov eax, dword ptr [esp + 0x28] // 41ffc7 | dec eax // 458bef | lea eax, [esp + 0x28] // 442bea | shr eax, 1 $sequence_5 = { 488d0d30ecfeff 4c8945e7 4d03e8 48895df7 4c8be3 4c896db7 } // n = 6, score = 100 // 488d0d30ecfeff | je 0x38b // 4c8945e7 | dec eax // 4d03e8 | cmp ebx, edi // 48895df7 | mov esi, dword ptr [ebp] // 4c8be3 | dec ecx // 4c896db7 | mov ebx, dword ptr [edi + esi*8 + 0x221c8] $sequence_6 = { 66895c2438 488d542438 c7442440ffffffff 488bcf 8974243c ff15???????? 83f8ff } // n = 7, score = 100 // 66895c2438 | je 0x59c // 488d542438 | mov al, byte ptr [ecx] // c7442440ffffffff | jmp 0x5a3 // 488bcf | dec eax // 8974243c | add esi, esi // ff15???????? | // 83f8ff | inc ecx $sequence_7 = { 488b4530 488b8888000000 488d05b2430100 483bc8 } // n = 4, score = 100 // 488b4530 | dec eax // 488b8888000000 | mov dword ptr [esp + 0x2070], eax // 488d05b2430100 | je 0x361 // 483bc8 | dec eax $sequence_8 = { be05000000 488d1574df0000 448bc6 488bcf e8???????? 85c0 7506 } // n = 7, score = 100 // be05000000 | dec eax // 488d1574df0000 | inc ecx // 448bc6 | mov al, byte ptr [ecx] // 488bcf | inc ecx // e8???????? | // 85c0 | cmp al, bl // 7506 | je 0x529 $sequence_9 = { 741c e8???????? 448938 e8???????? c70016000000 } // n = 5, score = 100 // 741c | mov ecx, edi // e8???????? | // 448938 | dec ecx // e8???????? | // c70016000000 | mov ecx, esp condition: 7 of them and filesize < 323584 }
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