Actor(s): Anunak
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rule win_socksbot_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.socksbot." 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.socksbot" 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 = { 75e9 5f 5b 8bc2 5e } // n = 5, score = 300 // 75e9 | jne 0xffffffeb // 5f | pop edi // 5b | pop ebx // 8bc2 | mov eax, edx // 5e | pop esi $sequence_1 = { 56 6a50 ff7508 33f6 8975fc e8???????? 8bd8 } // n = 7, score = 300 // 56 | push esi // 6a50 | push 0x50 // ff7508 | push dword ptr [ebp + 8] // 33f6 | xor esi, esi // 8975fc | mov dword ptr [ebp - 4], esi // e8???????? | // 8bd8 | mov ebx, eax $sequence_2 = { 8d85bcfeffff 50 ff15???????? 40 } // n = 4, score = 300 // 8d85bcfeffff | lea eax, [ebp - 0x144] // 50 | push eax // ff15???????? | // 40 | inc eax $sequence_3 = { 89759c ff15???????? 85c0 7507 32c0 e9???????? } // n = 6, score = 300 // 89759c | mov dword ptr [ebp - 0x64], esi // ff15???????? | // 85c0 | test eax, eax // 7507 | jne 9 // 32c0 | xor al, al // e9???????? | $sequence_4 = { 8b35???????? 57 ffd6 6a00 ff75f8 8bf8 } // n = 6, score = 300 // 8b35???????? | // 57 | push edi // ffd6 | call esi // 6a00 | push 0 // ff75f8 | push dword ptr [ebp - 8] // 8bf8 | mov edi, eax $sequence_5 = { 59 59 85f6 7e1c 33c0 50 } // n = 6, score = 300 // 59 | pop ecx // 59 | pop ecx // 85f6 | test esi, esi // 7e1c | jle 0x1e // 33c0 | xor eax, eax // 50 | push eax $sequence_6 = { 85c0 7564 8b45fc 33f6 8b08 } // n = 5, score = 300 // 85c0 | test eax, eax // 7564 | jne 0x66 // 8b45fc | mov eax, dword ptr [ebp - 4] // 33f6 | xor esi, esi // 8b08 | mov ecx, dword ptr [eax] $sequence_7 = { 7550 ff758c e8???????? 8bd8 59 85db 7441 } // n = 7, score = 300 // 7550 | jne 0x52 // ff758c | push dword ptr [ebp - 0x74] // e8???????? | // 8bd8 | mov ebx, eax // 59 | pop ecx // 85db | test ebx, ebx // 7441 | je 0x43 $sequence_8 = { 890d???????? a3???????? 5e c9 c3 55 } // n = 6, score = 300 // 890d???????? | // a3???????? | // 5e | pop esi // c9 | leave // c3 | ret // 55 | push ebp $sequence_9 = { e8???????? 83c40c c6443dd000 8b7df8 } // n = 4, score = 300 // e8???????? | // 83c40c | add esp, 0xc // c6443dd000 | mov byte ptr [ebp + edi - 0x30], 0 // 8b7df8 | mov edi, dword ptr [ebp - 8] condition: 7 of them and filesize < 73728 }
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