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rule win_cookiebag_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.cookiebag." 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.cookiebag" 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 = { 8b8de4feffff e9???????? 8b8de4feffff e9???????? 8b8d08ffffff e9???????? 8d8d1cffffff } // n = 7, score = 100 // 8b8de4feffff | mov ecx, dword ptr [ebp - 0x11c] // e9???????? | // 8b8de4feffff | mov ecx, dword ptr [ebp - 0x11c] // e9???????? | // 8b8d08ffffff | mov ecx, dword ptr [ebp - 0xf8] // e9???????? | // 8d8d1cffffff | lea ecx, [ebp - 0xe4] $sequence_1 = { 49 51 68???????? 8d4c2448 e8???????? 8a4c2470 53 } // n = 7, score = 100 // 49 | dec ecx // 51 | push ecx // 68???????? | // 8d4c2448 | lea ecx, [esp + 0x48] // e8???????? | // 8a4c2470 | mov cl, byte ptr [esp + 0x70] // 53 | push ebx $sequence_2 = { 85c0 7505 b8???????? 8078fffe 732e 6a01 8bcf } // n = 7, score = 100 // 85c0 | test eax, eax // 7505 | jne 7 // b8???????? | // 8078fffe | cmp byte ptr [eax - 1], 0xfe // 732e | jae 0x30 // 6a01 | push 1 // 8bcf | mov ecx, edi $sequence_3 = { 85c0 0f85f6000000 8b6d00 8b3d???????? 83fdff 7403 55 } // n = 7, score = 100 // 85c0 | test eax, eax // 0f85f6000000 | jne 0xfc // 8b6d00 | mov ebp, dword ptr [ebp] // 8b3d???????? | // 83fdff | cmp ebp, -1 // 7403 | je 5 // 55 | push ebp $sequence_4 = { 52 50 ff15???????? 85c0 7e45 55 8dbef0000000 } // n = 7, score = 100 // 52 | push edx // 50 | push eax // ff15???????? | // 85c0 | test eax, eax // 7e45 | jle 0x47 // 55 | push ebp // 8dbef0000000 | lea edi, [esi + 0xf0] $sequence_5 = { 52 8bce e8???????? 83ec10 8d44245c 8bcc 89642434 } // n = 7, score = 100 // 52 | push edx // 8bce | mov ecx, esi // e8???????? | // 83ec10 | sub esp, 0x10 // 8d44245c | lea eax, [esp + 0x5c] // 8bcc | mov ecx, esp // 89642434 | mov dword ptr [esp + 0x34], esp $sequence_6 = { 0f845e140000 8b4330 85c0 7505 b8???????? 8b5350 8bcb } // n = 7, score = 100 // 0f845e140000 | je 0x1464 // 8b4330 | mov eax, dword ptr [ebx + 0x30] // 85c0 | test eax, eax // 7505 | jne 7 // b8???????? | // 8b5350 | mov edx, dword ptr [ebx + 0x50] // 8bcb | mov ecx, ebx $sequence_7 = { 8d4c2424 55 885c2470 e8???????? 84c0 7423 8b7c2424 } // n = 7, score = 100 // 8d4c2424 | lea ecx, [esp + 0x24] // 55 | push ebp // 885c2470 | mov byte ptr [esp + 0x70], bl // e8???????? | // 84c0 | test al, al // 7423 | je 0x25 // 8b7c2424 | mov edi, dword ptr [esp + 0x24] $sequence_8 = { 8b2d???????? 8b4308 56 57 8bf8 3bef 8d7158 } // n = 7, score = 100 // 8b2d???????? | // 8b4308 | mov eax, dword ptr [ebx + 8] // 56 | push esi // 57 | push edi // 8bf8 | mov edi, eax // 3bef | cmp ebp, edi // 8d7158 | lea esi, [ecx + 0x58] $sequence_9 = { 7302 8be8 85ed 7633 8b4efc 2bc5 50 } // n = 7, score = 100 // 7302 | jae 4 // 8be8 | mov ebp, eax // 85ed | test ebp, ebp // 7633 | jbe 0x35 // 8b4efc | mov ecx, dword ptr [esi - 4] // 2bc5 | sub eax, ebp // 50 | push eax condition: 7 of them and filesize < 311296 }
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