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rule win_hamweq_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.hamweq." 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.hamweq" 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 = { 51 ff7508 ff9094000000 85c0 7424 395df8 } // n = 6, score = 200 // 51 | push ecx // ff7508 | push dword ptr [ebp + 8] // ff9094000000 | call dword ptr [eax + 0x94] // 85c0 | test eax, eax // 7424 | je 0x26 // 395df8 | cmp dword ptr [ebp - 8], ebx $sequence_1 = { 8d8500feffff 50 ff5148 8b4e08 8b06 ff7138 } // n = 6, score = 200 // 8d8500feffff | lea eax, [ebp - 0x200] // 50 | push eax // ff5148 | call dword ptr [ecx + 0x48] // 8b4e08 | mov ecx, dword ptr [esi + 8] // 8b06 | mov eax, dword ptr [esi] // ff7138 | push dword ptr [ecx + 0x38] $sequence_2 = { 8b06 53 6a06 6a02 53 53 } // n = 6, score = 200 // 8b06 | mov eax, dword ptr [esi] // 53 | push ebx // 6a06 | push 6 // 6a02 | push 2 // 53 | push ebx // 53 | push ebx $sequence_3 = { 8bf8 85ff 897df8 0f84a7070000 ff35???????? } // n = 5, score = 200 // 8bf8 | mov edi, eax // 85ff | test edi, edi // 897df8 | mov dword ptr [ebp - 8], edi // 0f84a7070000 | je 0x7ad // ff35???????? | $sequence_4 = { ff75e8 ff55f4 85c0 0f85a0000000 8b45dc } // n = 5, score = 200 // ff75e8 | push dword ptr [ebp - 0x18] // ff55f4 | call dword ptr [ebp - 0xc] // 85c0 | test eax, eax // 0f85a0000000 | jne 0xa6 // 8b45dc | mov eax, dword ptr [ebp - 0x24] $sequence_5 = { 83fb01 7228 8b3e 8d4508 6a00 50 8d85e4f1ffff } // n = 7, score = 200 // 83fb01 | cmp ebx, 1 // 7228 | jb 0x2a // 8b3e | mov edi, dword ptr [esi] // 8d4508 | lea eax, [ebp + 8] // 6a00 | push 0 // 50 | push eax // 8d85e4f1ffff | lea eax, [ebp - 0xe1c] $sequence_6 = { 8d4580 8b0b 50 ff5154 } // n = 4, score = 200 // 8d4580 | lea eax, [ebp - 0x80] // 8b0b | mov ecx, dword ptr [ebx] // 50 | push eax // ff5154 | call dword ptr [ecx + 0x54] $sequence_7 = { ff5020 33c0 eb0f 8d8dfcfdffff 6a02 51 } // n = 6, score = 200 // ff5020 | call dword ptr [eax + 0x20] // 33c0 | xor eax, eax // eb0f | jmp 0x11 // 8d8dfcfdffff | lea ecx, [ebp - 0x204] // 6a02 | push 2 // 51 | push ecx $sequence_8 = { 3ad0 742d 8b4c2414 8bd6 2bd1 8a19 3ad8 } // n = 7, score = 200 // 3ad0 | cmp dl, al // 742d | je 0x2f // 8b4c2414 | mov ecx, dword ptr [esp + 0x14] // 8bd6 | mov edx, esi // 2bd1 | sub edx, ecx // 8a19 | mov bl, byte ptr [ecx] // 3ad8 | cmp bl, al $sequence_9 = { 50 53 ff55f4 85c0 0f85bd040000 8b45f0 } // n = 6, score = 200 // 50 | push eax // 53 | push ebx // ff55f4 | call dword ptr [ebp - 0xc] // 85c0 | test eax, eax // 0f85bd040000 | jne 0x4c3 // 8b45f0 | mov eax, dword ptr [ebp - 0x10] condition: 7 of them and filesize < 24576 }
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