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rule win_getmail_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.getmail." 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.getmail" malpedia_rule_date = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { 49 51 68???????? eb15 bf???????? 83c9ff 33c0 } // n = 7, score = 100 // 49 | dec ecx // 51 | push ecx // 68???????? | // eb15 | jmp 0x17 // bf???????? | // 83c9ff | or ecx, 0xffffffff // 33c0 | xor eax, eax $sequence_1 = { 56 8b4304 85c0 7409 50 e8???????? 83c404 } // n = 7, score = 100 // 56 | push esi // 8b4304 | mov eax, dword ptr [ebx + 4] // 85c0 | test eax, eax // 7409 | je 0xb // 50 | push eax // e8???????? | // 83c404 | add esp, 4 $sequence_2 = { 50 885c241f c78424c400000008000000 c78424c80000001e001a00 89b424cc000000 c78424d00000001e001f0c c78424d40000000b001f0e } // n = 7, score = 100 // 50 | push eax // 885c241f | mov byte ptr [esp + 0x1f], bl // c78424c400000008000000 | mov dword ptr [esp + 0xc4], 8 // c78424c80000001e001a00 | mov dword ptr [esp + 0xc8], 0x1a001e // 89b424cc000000 | mov dword ptr [esp + 0xcc], esi // c78424d00000001e001f0c | mov dword ptr [esp + 0xd0], 0xc1f001e // c78424d40000000b001f0e | mov dword ptr [esp + 0xd4], 0xe1f000b $sequence_3 = { e8???????? 83c404 8b4c245c 897c2448 897c244c 897c2450 3bcf } // n = 7, score = 100 // e8???????? | // 83c404 | add esp, 4 // 8b4c245c | mov ecx, dword ptr [esp + 0x5c] // 897c2448 | mov dword ptr [esp + 0x48], edi // 897c244c | mov dword ptr [esp + 0x4c], edi // 897c2450 | mov dword ptr [esp + 0x50], edi // 3bcf | cmp ecx, edi $sequence_4 = { 33c0 896c2414 89442418 8b4c2440 8d7c2430 57 } // n = 6, score = 100 // 33c0 | xor eax, eax // 896c2414 | mov dword ptr [esp + 0x14], ebp // 89442418 | mov dword ptr [esp + 0x18], eax // 8b4c2440 | mov ecx, dword ptr [esp + 0x40] // 8d7c2430 | lea edi, [esp + 0x30] // 57 | push edi $sequence_5 = { 897c2420 897c2424 897c2428 8b10 c684243402000009 52 } // n = 6, score = 100 // 897c2420 | mov dword ptr [esp + 0x20], edi // 897c2424 | mov dword ptr [esp + 0x24], edi // 897c2428 | mov dword ptr [esp + 0x28], edi // 8b10 | mov edx, dword ptr [eax] // c684243402000009 | mov byte ptr [esp + 0x234], 9 // 52 | push edx $sequence_6 = { 68???????? e8???????? 8b4c2428 83c404 64890d00000000 5f 5e } // n = 7, score = 100 // 68???????? | // e8???????? | // 8b4c2428 | mov ecx, dword ptr [esp + 0x28] // 83c404 | add esp, 4 // 64890d00000000 | mov dword ptr fs:[0], ecx // 5f | pop edi // 5e | pop esi $sequence_7 = { ff15???????? 68???????? 8bf0 ff15???????? 3bf3 0f85af020000 } // n = 6, score = 100 // ff15???????? | // 68???????? | // 8bf0 | mov esi, eax // ff15???????? | // 3bf3 | cmp esi, ebx // 0f85af020000 | jne 0x2b5 $sequence_8 = { 53 56 8b74242c 8a06 897d04 884500 } // n = 6, score = 100 // 53 | push ebx // 56 | push esi // 8b74242c | mov esi, dword ptr [esp + 0x2c] // 8a06 | mov al, byte ptr [esi] // 897d04 | mov dword ptr [ebp + 4], edi // 884500 | mov byte ptr [ebp], al $sequence_9 = { 8d54246c 51 52 c78424ec01000000000000 e8???????? 83c420 } // n = 6, score = 100 // 8d54246c | lea edx, [esp + 0x6c] // 51 | push ecx // 52 | push edx // c78424ec01000000000000 | mov dword ptr [esp + 0x1ec], 0 // e8???????? | // 83c420 | add esp, 0x20 condition: 7 of them and filesize < 188416 }
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