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rule win_mapiget_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" version = "1" description = "Detects win.mapiget." 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.mapiget" 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 = { 68???????? 50 e8???????? ffb674eb4000 8d8560ffffff 50 e8???????? } // n = 7, score = 100 // 68???????? | // 50 | push eax // e8???????? | // ffb674eb4000 | push dword ptr [esi + 0x40eb74] // 8d8560ffffff | lea eax, dword ptr [ebp - 0xa0] // 50 | push eax // e8???????? | $sequence_1 = { 8365d800 c745dcbb3e4000 8b4518 8945e0 } // n = 4, score = 100 // 8365d800 | and dword ptr [ebp - 0x28], 0 // c745dcbb3e4000 | mov dword ptr [ebp - 0x24], 0x403ebb // 8b4518 | mov eax, dword ptr [ebp + 0x18] // 8945e0 | mov dword ptr [ebp - 0x20], eax $sequence_2 = { 52 68???????? e8???????? 83c40c e9???????? 8d85f0feffff 8d8d70ffffff } // n = 7, score = 100 // 52 | push edx // 68???????? | // e8???????? | // 83c40c | add esp, 0xc // e9???????? | // 8d85f0feffff | lea eax, dword ptr [ebp - 0x110] // 8d8d70ffffff | lea ecx, dword ptr [ebp - 0x90] $sequence_3 = { 7d15 8d3449 2bd1 8d34b5e0ea4000 832600 83c60c } // n = 6, score = 100 // 7d15 | jge 0x17 // 8d3449 | lea esi, dword ptr [ecx + ecx*2] // 2bd1 | sub edx, ecx // 8d34b5e0ea4000 | lea esi, dword ptr [esi*4 + 0x40eae0] // 832600 | and dword ptr [esi], 0 // 83c60c | add esi, 0xc $sequence_4 = { 8d95f0f9ffff 8d85f0feffff 52 8d8d70ffffff 50 } // n = 5, score = 100 // 8d95f0f9ffff | lea edx, dword ptr [ebp - 0x610] // 8d85f0feffff | lea eax, dword ptr [ebp - 0x110] // 52 | push edx // 8d8d70ffffff | lea ecx, dword ptr [ebp - 0x90] // 50 | push eax $sequence_5 = { b97f000000 33c0 8dbc242a020000 68???????? f3ab } // n = 5, score = 100 // b97f000000 | mov ecx, 0x7f // 33c0 | xor eax, eax // 8dbc242a020000 | lea edi, dword ptr [esp + 0x22a] // 68???????? | // f3ab | rep stosd dword ptr es:[edi], eax $sequence_6 = { 8d8df0f9ffff 51 e8???????? 83c404 6689bc45eef9ffff 8d95f0fdffff } // n = 6, score = 100 // 8d8df0f9ffff | lea ecx, dword ptr [ebp - 0x610] // 51 | push ecx // e8???????? | // 83c404 | add esp, 4 // 6689bc45eef9ffff | mov word ptr [ebp + eax*2 - 0x612], di // 8d95f0fdffff | lea edx, dword ptr [ebp - 0x210] $sequence_7 = { 0ae4 74c1 83c102 eb8c 8b442404 } // n = 5, score = 100 // 0ae4 | or ah, ah // 74c1 | je 0xffffffc3 // 83c102 | add ecx, 2 // eb8c | jmp 0xffffff8e // 8b442404 | mov eax, dword ptr [esp + 4] $sequence_8 = { 7229 f3a5 ff2495d8434000 8bc7 ba03000000 83e904 } // n = 6, score = 100 // 7229 | jb 0x2b // f3a5 | rep movsd dword ptr es:[edi], dword ptr [esi] // ff2495d8434000 | jmp dword ptr [edx*4 + 0x4043d8] // 8bc7 | mov eax, edi // ba03000000 | mov edx, 3 // 83e904 | sub ecx, 4 $sequence_9 = { 8365f000 8365f400 8365f800 8365fc00 c745f08d3e4000 } // n = 5, score = 100 // 8365f000 | and dword ptr [ebp - 0x10], 0 // 8365f400 | and dword ptr [ebp - 0xc], 0 // 8365f800 | and dword ptr [ebp - 8], 0 // 8365fc00 | and dword ptr [ebp - 4], 0 // c745f08d3e4000 | mov dword ptr [ebp - 0x10], 0x403e8d condition: 7 of them and filesize < 163840 }
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