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rule win_latentbot_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" version = "1" description = "Detects win.latentbot." 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.latentbot" malpedia_rule_date = "20220405" malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a" malpedia_version = "20220411" 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 = { e9???????? 33c0 40 e9???????? 8b87f42a0000 3bc3 745f } // n = 7, score = 100 // e9???????? | // 33c0 | xor eax, eax // 40 | inc eax // e9???????? | // 8b87f42a0000 | mov eax, dword ptr [edi + 0x2af4] // 3bc3 | cmp eax, ebx // 745f | je 0x61 $sequence_1 = { 59 eb0d 6a64 e8???????? 59 3975f8 74f3 } // n = 7, score = 100 // 59 | pop ecx // eb0d | jmp 0xf // 6a64 | push 0x64 // e8???????? | // 59 | pop ecx // 3975f8 | cmp dword ptr [ebp - 8], esi // 74f3 | je 0xfffffff5 $sequence_2 = { 682513471a 6aff 8945f4 e8???????? 8bd8 8d8520fdffff 50 } // n = 7, score = 100 // 682513471a | push 0x1a471325 // 6aff | push -1 // 8945f4 | mov dword ptr [ebp - 0xc], eax // e8???????? | // 8bd8 | mov ebx, eax // 8d8520fdffff | lea eax, dword ptr [ebp - 0x2e0] // 50 | push eax $sequence_3 = { 686888e3a2 56 89453c e8???????? 68b4d26883 56 89452c } // n = 7, score = 100 // 686888e3a2 | push 0xa2e38868 // 56 | push esi // 89453c | mov dword ptr [ebp + 0x3c], eax // e8???????? | // 68b4d26883 | push 0x8368d2b4 // 56 | push esi // 89452c | mov dword ptr [ebp + 0x2c], eax $sequence_4 = { 52 6a40 51 6a01 56 51 } // n = 6, score = 100 // 52 | push edx // 6a40 | push 0x40 // 51 | push ecx // 6a01 | push 1 // 56 | push esi // 51 | push ecx $sequence_5 = { 897c2438 6639142500000000 7408 ffc2 66393c12 75f8 } // n = 6, score = 100 // 897c2438 | mov dword ptr [esp + 0x38], edi // 6639142500000000 | cmp word ptr [0], dx // 7408 | je 0xa // ffc2 | inc edx // 66393c12 | cmp word ptr [edx + edx], di // 75f8 | jne 0xfffffffa $sequence_6 = { 41 57 48 81ec40030000 41 } // n = 5, score = 100 // 41 | inc ecx // 57 | push edi // 48 | dec eax // 81ec40030000 | sub esp, 0x340 // 41 | inc ecx $sequence_7 = { c7454802000000 c70609000000 e9???????? f6457c02 0f8421020000 c7454801000000 c70626000000 } // n = 7, score = 100 // c7454802000000 | mov dword ptr [ebp + 0x48], 2 // c70609000000 | mov dword ptr [esi], 9 // e9???????? | // f6457c02 | test byte ptr [ebp + 0x7c], 2 // 0f8421020000 | je 0x227 // c7454801000000 | mov dword ptr [ebp + 0x48], 1 // c70626000000 | mov dword ptr [esi], 0x26 $sequence_8 = { 8945d0 c745e001000000 895de8 395f04 767c 8d87d8000000 } // n = 6, score = 100 // 8945d0 | mov dword ptr [ebp - 0x30], eax // c745e001000000 | mov dword ptr [ebp - 0x20], 1 // 895de8 | mov dword ptr [ebp - 0x18], ebx // 395f04 | cmp dword ptr [edi + 4], ebx // 767c | jbe 0x7e // 8d87d8000000 | lea eax, dword ptr [edi + 0xd8] $sequence_9 = { 3b4f04 72a7 eb18 6800800000 8d45fc } // n = 5, score = 100 // 3b4f04 | cmp ecx, dword ptr [edi + 4] // 72a7 | jb 0xffffffa9 // eb18 | jmp 0x1a // 6800800000 | push 0x8000 // 8d45fc | lea eax, dword ptr [ebp - 4] condition: 7 of them and filesize < 401408 }
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