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rule win_govrat_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.govrat." 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.govrat" 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 = { 7725 0fb74002 8d709f 6683fe19 7702 03c2 6685c0 } // n = 7, score = 200 // 7725 | ja 0x27 // 0fb74002 | movzx eax, word ptr [eax + 2] // 8d709f | lea esi, [eax - 0x61] // 6683fe19 | cmp si, 0x19 // 7702 | ja 4 // 03c2 | add eax, edx // 6685c0 | test ax, ax $sequence_1 = { ff37 e8???????? 894620 85c0 7507 b80e000780 5f } // n = 7, score = 200 // ff37 | push dword ptr [edi] // e8???????? | // 894620 | mov dword ptr [esi + 0x20], eax // 85c0 | test eax, eax // 7507 | jne 9 // b80e000780 | mov eax, 0x8007000e // 5f | pop edi $sequence_2 = { e8???????? 83ec1c 8bf4 8965b4 } // n = 4, score = 200 // e8???????? | // 83ec1c | sub esp, 0x1c // 8bf4 | mov esi, esp // 8965b4 | mov dword ptr [ebp - 0x4c], esp $sequence_3 = { e8???????? 6aff 53 8d4db0 51 c645fc06 e8???????? } // n = 7, score = 200 // e8???????? | // 6aff | push -1 // 53 | push ebx // 8d4db0 | lea ecx, [ebp - 0x50] // 51 | push ecx // c645fc06 | mov byte ptr [ebp - 4], 6 // e8???????? | $sequence_4 = { 837dc808 8b75b4 7303 8d75b4 53 51 68???????? } // n = 7, score = 200 // 837dc808 | cmp dword ptr [ebp - 0x38], 8 // 8b75b4 | mov esi, dword ptr [ebp - 0x4c] // 7303 | jae 5 // 8d75b4 | lea esi, [ebp - 0x4c] // 53 | push ebx // 51 | push ecx // 68???????? | $sequence_5 = { 8d7c2428 ab ab 7548 8d442464 50 } // n = 6, score = 200 // 8d7c2428 | lea edi, [esp + 0x28] // ab | stosd dword ptr es:[edi], eax // ab | stosd dword ptr es:[edi], eax // 7548 | jne 0x4a // 8d442464 | lea eax, [esp + 0x64] // 50 | push eax $sequence_6 = { 0183f0bc0300 8393f4bc030000 e8???????? eb1d 8b45fc 2b45f0 ff75fc } // n = 7, score = 200 // 0183f0bc0300 | add dword ptr [ebx + 0x3bcf0], eax // 8393f4bc030000 | adc dword ptr [ebx + 0x3bcf4], 0 // e8???????? | // eb1d | jmp 0x1f // 8b45fc | mov eax, dword ptr [ebp - 4] // 2b45f0 | sub eax, dword ptr [ebp - 0x10] // ff75fc | push dword ptr [ebp - 4] $sequence_7 = { 7311 c70485????????e8814300 40 a3???????? c3 55 8bec } // n = 7, score = 200 // 7311 | jae 0x13 // c70485????????e8814300 | // 40 | inc eax // a3???????? | // c3 | ret // 55 | push ebp // 8bec | mov ebp, esp $sequence_8 = { 83ec18 56 8bf1 8b4610 8955f8 8945f4 83f804 } // n = 7, score = 200 // 83ec18 | sub esp, 0x18 // 56 | push esi // 8bf1 | mov esi, ecx // 8b4610 | mov eax, dword ptr [esi + 0x10] // 8955f8 | mov dword ptr [ebp - 8], edx // 8945f4 | mov dword ptr [ebp - 0xc], eax // 83f804 | cmp eax, 4 $sequence_9 = { 85f6 7403 832600 837d1000 0f8690000000 8b5d08 } // n = 6, score = 200 // 85f6 | test esi, esi // 7403 | je 5 // 832600 | and dword ptr [esi], 0 // 837d1000 | cmp dword ptr [ebp + 0x10], 0 // 0f8690000000 | jbe 0x96 // 8b5d08 | mov ebx, dword ptr [ebp + 8] condition: 7 of them and filesize < 761856 }
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