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rule win_silon_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-08-05" version = "1" description = "Detects win.silon." 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.silon" 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 = { 8d8df8fdffff 51 6a00 8b95fcfdffff 52 } // n = 5, score = 200 // 8d8df8fdffff | lea ecx, [ebp - 0x208] // 51 | push ecx // 6a00 | push 0 // 8b95fcfdffff | mov edx, dword ptr [ebp - 0x204] // 52 | push edx $sequence_1 = { 83c201 895594 8b4594 3b8578ffffff 0f839c010000 c78560fdffff00000000 } // n = 6, score = 200 // 83c201 | add edx, 1 // 895594 | mov dword ptr [ebp - 0x6c], edx // 8b4594 | mov eax, dword ptr [ebp - 0x6c] // 3b8578ffffff | cmp eax, dword ptr [ebp - 0x88] // 0f839c010000 | jae 0x1a2 // c78560fdffff00000000 | mov dword ptr [ebp - 0x2a0], 0 $sequence_2 = { 52 e8???????? 83c410 85c0 0f84fc000000 c745dc14000000 } // n = 6, score = 200 // 52 | push edx // e8???????? | // 83c410 | add esp, 0x10 // 85c0 | test eax, eax // 0f84fc000000 | je 0x102 // c745dc14000000 | mov dword ptr [ebp - 0x24], 0x14 $sequence_3 = { 8b4dfc 51 e8???????? 83c40c 8945fc 8b55fc 52 } // n = 7, score = 200 // 8b4dfc | mov ecx, dword ptr [ebp - 4] // 51 | push ecx // e8???????? | // 83c40c | add esp, 0xc // 8945fc | mov dword ptr [ebp - 4], eax // 8b55fc | mov edx, dword ptr [ebp - 4] // 52 | push edx $sequence_4 = { 52 8b45dc 6bc024 8b0d???????? 8b540118 52 e8???????? } // n = 7, score = 200 // 52 | push edx // 8b45dc | mov eax, dword ptr [ebp - 0x24] // 6bc024 | imul eax, eax, 0x24 // 8b0d???????? | // 8b540118 | mov edx, dword ptr [ecx + eax + 0x18] // 52 | push edx // e8???????? | $sequence_5 = { 8b45dc 6bc024 8b0d???????? 8b540118 52 8b4508 8b8854080000 } // n = 7, score = 200 // 8b45dc | mov eax, dword ptr [ebp - 0x24] // 6bc024 | imul eax, eax, 0x24 // 8b0d???????? | // 8b540118 | mov edx, dword ptr [ecx + eax + 0x18] // 52 | push edx // 8b4508 | mov eax, dword ptr [ebp + 8] // 8b8854080000 | mov ecx, dword ptr [eax + 0x854] $sequence_6 = { 8b55f0 8b02 8b4df0 51 8b500c ffd2 } // n = 6, score = 200 // 8b55f0 | mov edx, dword ptr [ebp - 0x10] // 8b02 | mov eax, dword ptr [edx] // 8b4df0 | mov ecx, dword ptr [ebp - 0x10] // 51 | push ecx // 8b500c | mov edx, dword ptr [eax + 0xc] // ffd2 | call edx $sequence_7 = { c785e8fdffff00000000 c785ecfdffff00000000 6a00 6a00 6a00 6a00 } // n = 6, score = 200 // c785e8fdffff00000000 | mov dword ptr [ebp - 0x218], 0 // c785ecfdffff00000000 | mov dword ptr [ebp - 0x214], 0 // 6a00 | push 0 // 6a00 | push 0 // 6a00 | push 0 // 6a00 | push 0 $sequence_8 = { 0fbe11 c1e202 8b856cffffff 6689544590 ebcc 8d4d90 } // n = 6, score = 200 // 0fbe11 | movsx edx, byte ptr [ecx] // c1e202 | shl edx, 2 // 8b856cffffff | mov eax, dword ptr [ebp - 0x94] // 6689544590 | mov word ptr [ebp + eax*2 - 0x70], dx // ebcc | jmp 0xffffffce // 8d4d90 | lea ecx, [ebp - 0x70] $sequence_9 = { 8d4518 50 8b4d14 51 8b55f4 52 e8???????? } // n = 7, score = 200 // 8d4518 | lea eax, [ebp + 0x18] // 50 | push eax // 8b4d14 | mov ecx, dword ptr [ebp + 0x14] // 51 | push ecx // 8b55f4 | mov edx, dword ptr [ebp - 0xc] // 52 | push edx // e8???????? | condition: 7 of them and filesize < 122880 }
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