Actor(s): Anunak
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rule win_socksbot_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" 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 = "20220513" malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26" malpedia_version = "20220516" 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 = { 6804010000 8d8578feffff 50 ff15???????? } // n = 4, score = 300 // 6804010000 | push 0x104 // 8d8578feffff | lea eax, [ebp - 0x188] // 50 | push eax // ff15???????? | $sequence_1 = { 6a03 6a00 53 e8???????? 8b75fc 83c40c e9???????? } // n = 7, score = 300 // 6a03 | push 3 // 6a00 | push 0 // 53 | push ebx // e8???????? | // 8b75fc | mov esi, dword ptr [ebp - 4] // 83c40c | add esp, 0xc // e9???????? | $sequence_2 = { 4b ebdc 64a130000000 895de0 8b400c c745d803000000 8b4014 } // n = 7, score = 300 // 4b | dec ebx // ebdc | jmp 0xffffffde // 64a130000000 | mov eax, dword ptr fs:[0x30] // 895de0 | mov dword ptr [ebp - 0x20], ebx // 8b400c | mov eax, dword ptr [eax + 0xc] // c745d803000000 | mov dword ptr [ebp - 0x28], 3 // 8b4014 | mov eax, dword ptr [eax + 0x14] $sequence_3 = { 57 884508 8a450c bf???????? } // n = 4, score = 300 // 57 | push edi // 884508 | mov byte ptr [ebp + 8], al // 8a450c | mov al, byte ptr [ebp + 0xc] // bf???????? | $sequence_4 = { 8975f4 897df0 8d5df7 33d2 0fb603 } // n = 5, score = 300 // 8975f4 | mov dword ptr [ebp - 0xc], esi // 897df0 | mov dword ptr [ebp - 0x10], edi // 8d5df7 | lea ebx, [ebp - 9] // 33d2 | xor edx, edx // 0fb603 | movzx eax, byte ptr [ebx] $sequence_5 = { 0f84aa000000 8b9ea0000000 03df 895de0 8d4b04 894de8 8b01 } // n = 7, score = 300 // 0f84aa000000 | je 0xb0 // 8b9ea0000000 | mov ebx, dword ptr [esi + 0xa0] // 03df | add ebx, edi // 895de0 | mov dword ptr [ebp - 0x20], ebx // 8d4b04 | lea ecx, [ebx + 4] // 894de8 | mov dword ptr [ebp - 0x18], ecx // 8b01 | mov eax, dword ptr [ecx] $sequence_6 = { 7772 56 57 e8???????? 6a03 8bf0 57 } // n = 7, score = 300 // 7772 | ja 0x74 // 56 | push esi // 57 | push edi // e8???????? | // 6a03 | push 3 // 8bf0 | mov esi, eax // 57 | push edi $sequence_7 = { 8b5508 59 8d0c1e 43 } // n = 4, score = 300 // 8b5508 | mov edx, dword ptr [ebp + 8] // 59 | pop ecx // 8d0c1e | lea ecx, [esi + ebx] // 43 | inc ebx $sequence_8 = { 56 57 e8???????? 8d8520fdffff 6a0a 50 } // n = 6, score = 300 // 56 | push esi // 57 | push edi // e8???????? | // 8d8520fdffff | lea eax, [ebp - 0x2e0] // 6a0a | push 0xa // 50 | push eax $sequence_9 = { 81c60c000100 4b 75d2 68???????? ff15???????? a0???????? } // n = 6, score = 300 // 81c60c000100 | add esi, 0x1000c // 4b | dec ebx // 75d2 | jne 0xffffffd4 // 68???????? | // ff15???????? | // a0???????? | condition: 7 of them and filesize < 73728 }
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