Actor(s): Red Menshen
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rule win_mangzamel_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" 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 = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { 8a86c5020000 3ac3 751e 8b9694000000 8b4d08 2b4e64 69d280ee3600 } // n = 7, score = 400 // 8a86c5020000 | mov al, byte ptr [esi + 0x2c5] // 3ac3 | cmp al, bl // 751e | jne 0x20 // 8b9694000000 | mov edx, dword ptr [esi + 0x94] // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 2b4e64 | sub ecx, dword ptr [esi + 0x64] // 69d280ee3600 | imul edx, edx, 0x36ee80 $sequence_1 = { 8d8ddcfeffff e8???????? 8b4df4 5f 8ac3 5e 5b } // n = 7, score = 400 // 8d8ddcfeffff | lea ecx, [ebp - 0x124] // e8???????? | // 8b4df4 | mov ecx, dword ptr [ebp - 0xc] // 5f | pop edi // 8ac3 | mov al, bl // 5e | pop esi // 5b | pop ebx $sequence_2 = { 6a01 ff35???????? ff35???????? e8???????? 894604 a1???????? 83c40c } // n = 7, score = 400 // 6a01 | push 1 // ff35???????? | // ff35???????? | // e8???????? | // 894604 | mov dword ptr [esi + 4], eax // a1???????? | // 83c40c | add esp, 0xc $sequence_3 = { ff750c 6a01 eb3b ff750c 8bcb e8???????? } // n = 6, score = 400 // ff750c | push dword ptr [ebp + 0xc] // 6a01 | push 1 // eb3b | jmp 0x3d // ff750c | push dword ptr [ebp + 0xc] // 8bcb | mov ecx, ebx // e8???????? | $sequence_4 = { 6a02 84c0 5e 747a 3975cc 7575 8b751c } // n = 7, score = 400 // 6a02 | push 2 // 84c0 | test al, al // 5e | pop esi // 747a | je 0x7c // 3975cc | cmp dword ptr [ebp - 0x34], esi // 7575 | jne 0x77 // 8b751c | mov esi, dword ptr [ebp + 0x1c] $sequence_5 = { 8d4dec 56 e8???????? 85c0 7c31 8d85d8feffff 50 } // n = 7, score = 400 // 8d4dec | lea ecx, [ebp - 0x14] // 56 | push esi // e8???????? | // 85c0 | test eax, eax // 7c31 | jl 0x33 // 8d85d8feffff | lea eax, [ebp - 0x128] // 50 | push eax $sequence_6 = { 46 3bf7 72f0 834dfcff 8d4de0 e8???????? 5f } // n = 7, score = 400 // 46 | inc esi // 3bf7 | cmp esi, edi // 72f0 | jb 0xfffffff2 // 834dfcff | or dword ptr [ebp - 4], 0xffffffff // 8d4de0 | lea ecx, [ebp - 0x20] // e8???????? | // 5f | pop edi $sequence_7 = { c1e003 85f6 894508 746a 837d1400 7464 3b4514 } // n = 7, score = 400 // c1e003 | shl eax, 3 // 85f6 | test esi, esi // 894508 | mov dword ptr [ebp + 8], eax // 746a | je 0x6c // 837d1400 | cmp dword ptr [ebp + 0x14], 0 // 7464 | je 0x66 // 3b4514 | cmp eax, dword ptr [ebp + 0x14] $sequence_8 = { ff75fc 6805000102 57 ff767c e8???????? 57 57 } // n = 7, score = 400 // ff75fc | push dword ptr [ebp - 4] // 6805000102 | push 0x2010005 // 57 | push edi // ff767c | push dword ptr [esi + 0x7c] // e8???????? | // 57 | push edi // 57 | push edi $sequence_9 = { 7466 56 6a2c e8???????? 8bf0 59 89751c } // n = 7, score = 400 // 7466 | je 0x68 // 56 | push esi // 6a2c | push 0x2c // e8???????? | // 8bf0 | mov esi, eax // 59 | pop ecx // 89751c | mov dword ptr [ebp + 0x1c], esi condition: 7 of them and filesize < 360448 }
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