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rule win_mangzamel_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" version = "1" description = "Detects win.mangzamel." 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.mangzamel" 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 = { ff35???????? 50 ffd6 85c0 75c7 } // n = 5, score = 400 // ff35???????? | // 50 | push eax // ffd6 | call esi // 85c0 | test eax, eax // 75c7 | jne 0xffffffc9 $sequence_1 = { 8b40f8 2bc6 48 50 8d4508 50 e8???????? } // n = 7, score = 400 // 8b40f8 | mov eax, dword ptr [eax - 8] // 2bc6 | sub eax, esi // 48 | dec eax // 50 | push eax // 8d4508 | lea eax, dword ptr [ebp + 8] // 50 | push eax // e8???????? | $sequence_2 = { e8???????? 8bf0 8b4514 0516340000 6a19 50 } // n = 6, score = 400 // e8???????? | // 8bf0 | mov esi, eax // 8b4514 | mov eax, dword ptr [ebp + 0x14] // 0516340000 | add eax, 0x3416 // 6a19 | push 0x19 // 50 | push eax $sequence_3 = { e9???????? 8d8e90000000 e8???????? eb7e 8b06 80a6c502000000 6801110011 } // n = 7, score = 400 // e9???????? | // 8d8e90000000 | lea ecx, dword ptr [esi + 0x90] // e8???????? | // eb7e | jmp 0x80 // 8b06 | mov eax, dword ptr [esi] // 80a6c502000000 | and byte ptr [esi + 0x2c5], 0 // 6801110011 | push 0x11001101 $sequence_4 = { e8???????? 8d4d08 c645fc03 e8???????? 6a2e 8d4dec e8???????? } // n = 7, score = 400 // e8???????? | // 8d4d08 | lea ecx, dword ptr [ebp + 8] // c645fc03 | mov byte ptr [ebp - 4], 3 // e8???????? | // 6a2e | push 0x2e // 8d4dec | lea ecx, dword ptr [ebp - 0x14] // e8???????? | $sequence_5 = { 51 8d8f16340000 51 8bce ff7510 ff5034 84c0 } // n = 7, score = 400 // 51 | push ecx // 8d8f16340000 | lea ecx, dword ptr [edi + 0x3416] // 51 | push ecx // 8bce | mov ecx, esi // ff7510 | push dword ptr [ebp + 0x10] // ff5034 | call dword ptr [eax + 0x34] // 84c0 | test al, al $sequence_6 = { 8b4708 83650800 85c0 8945f4 7658 8b4704 } // n = 6, score = 400 // 8b4708 | mov eax, dword ptr [edi + 8] // 83650800 | and dword ptr [ebp + 8], 0 // 85c0 | test eax, eax // 8945f4 | mov dword ptr [ebp - 0xc], eax // 7658 | jbe 0x5a // 8b4704 | mov eax, dword ptr [edi + 4] $sequence_7 = { e8???????? 8b4d18 50 e8???????? 50 } // n = 5, score = 400 // e8???????? | // 8b4d18 | mov ecx, dword ptr [ebp + 0x18] // 50 | push eax // e8???????? | // 50 | push eax $sequence_8 = { 8bc8 e8???????? 8bf0 85f6 7407 8bce e8???????? } // n = 7, score = 400 // 8bc8 | mov ecx, eax // e8???????? | // 8bf0 | mov esi, eax // 85f6 | test esi, esi // 7407 | je 9 // 8bce | mov ecx, esi // e8???????? | $sequence_9 = { 8937 8bc2 5f 5e 5b c3 } // n = 6, score = 400 // 8937 | mov dword ptr [edi], esi // 8bc2 | mov eax, edx // 5f | pop edi // 5e | pop esi // 5b | pop ebx // c3 | ret condition: 7 of them and filesize < 360448 }
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