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rule win_socks5_systemz_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.socks5_systemz." 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.socks5_systemz" malpedia_rule_date = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { e8???????? 89857cfdffff 68???????? 8d8d50fdffff } // n = 4, score = 200 // e8???????? | // 89857cfdffff | mov dword ptr [ebp - 0x284], eax // 68???????? | // 8d8d50fdffff | lea ecx, [ebp - 0x2b0] $sequence_1 = { c68546ffffff88 c68547ffffff88 c68548ffffff83 c68549ffffff85 c6854affffff92 c6854bffffff83 } // n = 6, score = 200 // c68546ffffff88 | mov byte ptr [ebp - 0xba], 0x88 // c68547ffffff88 | mov byte ptr [ebp - 0xb9], 0x88 // c68548ffffff83 | mov byte ptr [ebp - 0xb8], 0x83 // c68549ffffff85 | mov byte ptr [ebp - 0xb7], 0x85 // c6854affffff92 | mov byte ptr [ebp - 0xb6], 0x92 // c6854bffffff83 | mov byte ptr [ebp - 0xb5], 0x83 $sequence_2 = { e8???????? c645fc0e 8d8dd0feffff e8???????? 83ec08 8bcc } // n = 6, score = 200 // e8???????? | // c645fc0e | mov byte ptr [ebp - 4], 0xe // 8d8dd0feffff | lea ecx, [ebp - 0x130] // e8???????? | // 83ec08 | sub esp, 8 // 8bcc | mov ecx, esp $sequence_3 = { 8bf0 8d4ddc 56 e8???????? 03fe 8d4d10 } // n = 6, score = 200 // 8bf0 | mov esi, eax // 8d4ddc | lea ecx, [ebp - 0x24] // 56 | push esi // e8???????? | // 03fe | add edi, esi // 8d4d10 | lea ecx, [ebp + 0x10] $sequence_4 = { 8bce e8???????? 8906 8bc6 5e c20400 } // n = 6, score = 200 // 8bce | mov ecx, esi // e8???????? | // 8906 | mov dword ptr [esi], eax // 8bc6 | mov eax, esi // 5e | pop esi // c20400 | ret 4 $sequence_5 = { e8???????? 8bce e8???????? 8d4510 c645fc02 50 } // n = 6, score = 200 // e8???????? | // 8bce | mov ecx, esi // e8???????? | // 8d4510 | lea eax, [ebp + 0x10] // c645fc02 | mov byte ptr [ebp - 4], 2 // 50 | push eax $sequence_6 = { 8b4508 eb0f 8d4dec 51 8b4d08 e8???????? } // n = 6, score = 200 // 8b4508 | mov eax, dword ptr [ebp + 8] // eb0f | jmp 0x11 // 8d4dec | lea ecx, [ebp - 0x14] // 51 | push ecx // 8b4d08 | mov ecx, dword ptr [ebp + 8] // e8???????? | $sequence_7 = { 8b45f0 83c024 50 ff15???????? 8b4df0 83c12c e8???????? } // n = 7, score = 200 // 8b45f0 | mov eax, dword ptr [ebp - 0x10] // 83c024 | add eax, 0x24 // 50 | push eax // ff15???????? | // 8b4df0 | mov ecx, dword ptr [ebp - 0x10] // 83c12c | add ecx, 0x2c // e8???????? | condition: 7 of them and filesize < 491520 }
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