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rule win_zeus_action_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.zeus_action." 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.zeus_action" malpedia_rule_date = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = { 668945fa 8d75f4 a5 a5 a5 8383d87500000c 33f6 } // n = 7, score = 300 // 668945fa | mov word ptr [ebp - 6], ax // 8d75f4 | lea esi, [ebp - 0xc] // a5 | movsd dword ptr es:[edi], dword ptr [esi] // a5 | movsd dword ptr es:[edi], dword ptr [esi] // a5 | movsd dword ptr es:[edi], dword ptr [esi] // 8383d87500000c | add dword ptr [ebx + 0x75d8], 0xc // 33f6 | xor esi, esi $sequence_1 = { 7417 8b01 57 51 ff5034 8b4de8 85c9 } // n = 7, score = 300 // 7417 | je 0x19 // 8b01 | mov eax, dword ptr [ecx] // 57 | push edi // 51 | push ecx // ff5034 | call dword ptr [eax + 0x34] // 8b4de8 | mov ecx, dword ptr [ebp - 0x18] // 85c9 | test ecx, ecx $sequence_2 = { ff15???????? b800080000 663b05???????? 7510 e8???????? 84c0 7407 } // n = 7, score = 300 // ff15???????? | // b800080000 | mov eax, 0x800 // 663b05???????? | // 7510 | jne 0x12 // e8???????? | // 84c0 | test al, al // 7407 | je 9 $sequence_3 = { 894508 3bf0 7433 8d7b14 85f6 7504 33c0 } // n = 7, score = 300 // 894508 | mov dword ptr [ebp + 8], eax // 3bf0 | cmp esi, eax // 7433 | je 0x35 // 8d7b14 | lea edi, [ebx + 0x14] // 85f6 | test esi, esi // 7504 | jne 6 // 33c0 | xor eax, eax $sequence_4 = { 0f84d0020000 395df8 0f84c7020000 395df4 0f84be020000 395dd0 0f84b5020000 } // n = 7, score = 300 // 0f84d0020000 | je 0x2d6 // 395df8 | cmp dword ptr [ebp - 8], ebx // 0f84c7020000 | je 0x2cd // 395df4 | cmp dword ptr [ebp - 0xc], ebx // 0f84be020000 | je 0x2c4 // 395dd0 | cmp dword ptr [ebp - 0x30], ebx // 0f84b5020000 | je 0x2bb $sequence_5 = { 49 3bc6 7509 8b7dd8 894de8 } // n = 5, score = 300 // 49 | dec ecx // 3bc6 | cmp eax, esi // 7509 | jne 0xb // 8b7dd8 | mov edi, dword ptr [ebp - 0x28] // 894de8 | mov dword ptr [ebp - 0x18], ecx $sequence_6 = { 59 85c0 0f8479010000 837ddc00 740f 53 e8???????? } // n = 7, score = 300 // 59 | pop ecx // 85c0 | test eax, eax // 0f8479010000 | je 0x17f // 837ddc00 | cmp dword ptr [ebp - 0x24], 0 // 740f | je 0x11 // 53 | push ebx // e8???????? | $sequence_7 = { 83c0fb 83f803 7740 f745d000080000 7416 03f9 03d9 } // n = 7, score = 300 // 83c0fb | add eax, -5 // 83f803 | cmp eax, 3 // 7740 | ja 0x42 // f745d000080000 | test dword ptr [ebp - 0x30], 0x800 // 7416 | je 0x18 // 03f9 | add edi, ecx // 03d9 | add ebx, ecx $sequence_8 = { 50 8b4618 83c004 50 ff15???????? 8b761c 83c40c } // n = 7, score = 300 // 50 | push eax // 8b4618 | mov eax, dword ptr [esi + 0x18] // 83c004 | add eax, 4 // 50 | push eax // ff15???????? | // 8b761c | mov esi, dword ptr [esi + 0x1c] // 83c40c | add esp, 0xc $sequence_9 = { ff15???????? 85c0 7817 56 8d85f8fdffff 50 8d85f0fbffff } // n = 7, score = 300 // ff15???????? | // 85c0 | test eax, eax // 7817 | js 0x19 // 56 | push esi // 8d85f8fdffff | lea eax, [ebp - 0x208] // 50 | push eax // 8d85f0fbffff | lea eax, [ebp - 0x410] condition: 7 of them and filesize < 827392 }
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