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rule win_glooxmail_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 = { 8b4d94 894524 8b01 83c410 ff5004 6a01 884594 } // n = 7, score = 100 // 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] // 6a01 | push 1 // 884594 | mov byte ptr [ebp - 0x6c], al $sequence_1 = { 50 51 b848800000 e8???????? a1???????? 33c4 89842444800000 } // n = 7, score = 100 // 50 | push eax // 51 | push ecx // b848800000 | mov eax, 0x8048 // e8???????? | // a1???????? | // 33c4 | xor eax, esp // 89842444800000 | mov dword ptr [esp + 0x8044], eax $sequence_2 = { 68???????? 64a100000000 50 83ec74 a1???????? 33c5 898500000100 } // n = 7, score = 100 // 68???????? | // 64a100000000 | mov eax, dword ptr fs:[0] // 50 | push eax // 83ec74 | sub esp, 0x74 // a1???????? | // 33c5 | xor eax, ebp // 898500000100 | mov dword ptr [ebp + 0x10000], eax $sequence_3 = { e8???????? eb27 83781810 7205 8b4804 eb03 8d4804 } // n = 7, score = 100 // e8???????? | // eb27 | jmp 0x29 // 83781810 | cmp dword ptr [eax + 0x18], 0x10 // 7205 | jb 7 // 8b4804 | mov ecx, dword ptr [eax + 4] // eb03 | jmp 5 // 8d4804 | lea ecx, [eax + 4] $sequence_4 = { 85c0 7519 a1???????? 85c0 7424 50 ff15???????? } // n = 7, score = 100 // 85c0 | test eax, eax // 7519 | jne 0x1b // a1???????? | // 85c0 | test eax, eax // 7424 | je 0x26 // 50 | push eax // ff15???????? | $sequence_5 = { 8d4d98 c645fc03 e8???????? 56 8d4dd0 e8???????? 56 } // n = 7, score = 100 // 8d4d98 | lea ecx, [ebp - 0x68] // c645fc03 | mov byte ptr [ebp - 4], 3 // e8???????? | // 56 | push esi // 8d4dd0 | lea ecx, [ebp - 0x30] // e8???????? | // 56 | push esi $sequence_6 = { 8b4d08 81c19c020000 e9???????? 8b4d08 81c1b8020000 e9???????? 8b4d08 } // n = 7, score = 100 // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 81c19c020000 | add ecx, 0x29c // e9???????? | // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 81c1b8020000 | add ecx, 0x2b8 // e9???????? | // 8b4d08 | mov ecx, dword ptr [ebp + 8] $sequence_7 = { c700???????? c74004???????? c74008???????? c7400cb04a4400 c74010bc4a4400 c74014c84a4400 c74018d44a4400 } // n = 7, score = 100 // c700???????? | // c74004???????? | // c74008???????? | // c7400cb04a4400 | mov dword ptr [eax + 0xc], 0x444ab0 // c74010bc4a4400 | mov dword ptr [eax + 0x10], 0x444abc // c74014c84a4400 | mov dword ptr [eax + 0x14], 0x444ac8 // c74018d44a4400 | mov dword ptr [eax + 0x18], 0x444ad4 $sequence_8 = { 834dfcff 845dec 740b 6a00 53 8d4dcc e8???????? } // n = 7, score = 100 // 834dfcff | or dword ptr [ebp - 4], 0xffffffff // 845dec | test byte ptr [ebp - 0x14], bl // 740b | je 0xd // 6a00 | push 0 // 53 | push ebx // 8d4dcc | lea ecx, [ebp - 0x34] // e8???????? | $sequence_9 = { 53 6aff ff7508 8945fc 53 53 895df4 } // n = 7, score = 100 // 53 | push ebx // 6aff | push -1 // ff7508 | push dword ptr [ebp + 8] // 8945fc | mov dword ptr [ebp - 4], eax // 53 | push ebx // 53 | push ebx // 895df4 | mov dword ptr [ebp - 0xc], ebx condition: 7 of them and filesize < 761856 }
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