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rule win_glooxmail_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.glooxmail." 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.glooxmail" 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 = { 894d20 8b4004 8b4d94 894524 8b01 83c410 ff5004 } // n = 7, score = 100 // 894d20 | mov dword ptr [ebp + 0x20], ecx // 8b4004 | mov eax, dword ptr [eax + 4] // 8b4d94 | mov ecx, dword ptr [ebp - 0x6c] // 894524 | mov dword ptr [ebp + 0x24], eax // 8b01 | mov eax, dword ptr [ecx] // 83c410 | add esp, 0x10 // ff5004 | call dword ptr [eax + 4] $sequence_1 = { 3918 7507 c745f801000000 39583c 7507 8b08 03c8 } // n = 7, score = 100 // 3918 | cmp dword ptr [eax], ebx // 7507 | jne 9 // c745f801000000 | mov dword ptr [ebp - 8], 1 // 39583c | cmp dword ptr [eax + 0x3c], ebx // 7507 | jne 9 // 8b08 | mov ecx, dword ptr [eax] // 03c8 | add ecx, eax $sequence_2 = { 8d44244c 50 e8???????? 83c420 8bf8 c78424c800000001000000 834c241002 } // n = 7, score = 100 // 8d44244c | lea eax, [esp + 0x4c] // 50 | push eax // e8???????? | // 83c420 | add esp, 0x20 // 8bf8 | mov edi, eax // c78424c800000001000000 | mov dword ptr [esp + 0xc8], 1 // 834c241002 | or dword ptr [esp + 0x10], 2 $sequence_3 = { 8d8d04ffffff c645fc10 8b06 51 8bce ff5010 } // n = 6, score = 100 // 8d8d04ffffff | lea ecx, [ebp - 0xfc] // c645fc10 | mov byte ptr [ebp - 4], 0x10 // 8b06 | mov eax, dword ptr [esi] // 51 | push ecx // 8bce | mov ecx, esi // ff5010 | call dword ptr [eax + 0x10] $sequence_4 = { 50 8d8f8c000000 e8???????? 56 53 50 8d4f70 } // n = 7, score = 100 // 50 | push eax // 8d8f8c000000 | lea ecx, [edi + 0x8c] // e8???????? | // 56 | push esi // 53 | push ebx // 50 | push eax // 8d4f70 | lea ecx, [edi + 0x70] $sequence_5 = { 47 68???????? 8d8d30ffffff 897dd0 e8???????? 6a03 } // n = 6, score = 100 // 47 | inc edi // 68???????? | // 8d8d30ffffff | lea ecx, [ebp - 0xd0] // 897dd0 | mov dword ptr [ebp - 0x30], edi // e8???????? | // 6a03 | push 3 $sequence_6 = { 68ff7f0000 8d85fd7fffff 6a00 50 8bf1 8bfa c685fc7fffff00 } // n = 7, score = 100 // 68ff7f0000 | push 0x7fff // 8d85fd7fffff | lea eax, [ebp - 0x8003] // 6a00 | push 0 // 50 | push eax // 8bf1 | mov esi, ecx // 8bfa | mov edi, edx // c685fc7fffff00 | mov byte ptr [ebp - 0x8004], 0 $sequence_7 = { 397714 7468 3bde 7464 83fbff 745f 53 } // n = 7, score = 100 // 397714 | cmp dword ptr [edi + 0x14], esi // 7468 | je 0x6a // 3bde | cmp ebx, esi // 7464 | je 0x66 // 83fbff | cmp ebx, -1 // 745f | je 0x61 // 53 | push ebx $sequence_8 = { 8b4558 8b4008 8b30 8b07 53 ff506c 50 } // n = 7, score = 100 // 8b4558 | mov eax, dword ptr [ebp + 0x58] // 8b4008 | mov eax, dword ptr [eax + 8] // 8b30 | mov esi, dword ptr [eax] // 8b07 | mov eax, dword ptr [edi] // 53 | push ebx // ff506c | call dword ptr [eax + 0x6c] // 50 | push eax $sequence_9 = { 8d45d8 50 e8???????? 59 59 6aff 53 } // n = 7, score = 100 // 8d45d8 | lea eax, [ebp - 0x28] // 50 | push eax // e8???????? | // 59 | pop ecx // 59 | pop ecx // 6aff | push -1 // 53 | push ebx condition: 7 of them and filesize < 761856 }
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