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rule win_miniasp_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.miniasp." 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.miniasp" 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 = { 75e2 8bbd18dfffff 8bb520dfffff 8b851cdfffff 8bc8 c1e902 } // n = 6, score = 100 // 75e2 | jne 0xffffffe4 // 8bbd18dfffff | mov edi, dword ptr [ebp - 0x20e8] // 8bb520dfffff | mov esi, dword ptr [ebp - 0x20e0] // 8b851cdfffff | mov eax, dword ptr [ebp - 0x20e4] // 8bc8 | mov ecx, eax // c1e902 | shr ecx, 2 $sequence_1 = { eb17 6a00 ff75fc ff15???????? ff75fc ff15???????? } // n = 6, score = 100 // eb17 | jmp 0x19 // 6a00 | push 0 // ff75fc | push dword ptr [ebp - 4] // ff15???????? | // ff75fc | push dword ptr [ebp - 4] // ff15???????? | $sequence_2 = { c745f04cd24000 68???????? 8d45f0 50 e8???????? 6800000080 6a36 } // n = 7, score = 100 // c745f04cd24000 | mov dword ptr [ebp - 0x10], 0x40d24c // 68???????? | // 8d45f0 | lea eax, [ebp - 0x10] // 50 | push eax // e8???????? | // 6800000080 | push 0x80000000 // 6a36 | push 0x36 $sequence_3 = { c780b800000000040000 6800001000 e8???????? 59 } // n = 4, score = 100 // c780b800000000040000 | mov dword ptr [eax + 0xb8], 0x400 // 6800001000 | push 0x100000 // e8???????? | // 59 | pop ecx $sequence_4 = { c1e810 25ffff0000 0fb7c0 8945b0 8b45b4 8945a4 } // n = 6, score = 100 // c1e810 | shr eax, 0x10 // 25ffff0000 | and eax, 0xffff // 0fb7c0 | movzx eax, ax // 8945b0 | mov dword ptr [ebp - 0x50], eax // 8b45b4 | mov eax, dword ptr [ebp - 0x4c] // 8945a4 | mov dword ptr [ebp - 0x5c], eax $sequence_5 = { ff7508 e8???????? 59 59 3b4508 0f85bb000000 8d8dd8dfffff } // n = 7, score = 100 // ff7508 | push dword ptr [ebp + 8] // e8???????? | // 59 | pop ecx // 59 | pop ecx // 3b4508 | cmp eax, dword ptr [ebp + 8] // 0f85bb000000 | jne 0xc1 // 8d8dd8dfffff | lea ecx, [ebp - 0x2028] $sequence_6 = { 837dfc00 0f8e1e010000 ff75fc 8b45bc ffb0b4000000 ff750c } // n = 6, score = 100 // 837dfc00 | cmp dword ptr [ebp - 4], 0 // 0f8e1e010000 | jle 0x124 // ff75fc | push dword ptr [ebp - 4] // 8b45bc | mov eax, dword ptr [ebp - 0x44] // ffb0b4000000 | push dword ptr [eax + 0xb4] // ff750c | push dword ptr [ebp + 0xc] $sequence_7 = { 8885a3deffff ff85a4deffff 80bda3deffff00 75e2 8bbda4deffff be???????? } // n = 6, score = 100 // 8885a3deffff | mov byte ptr [ebp - 0x215d], al // ff85a4deffff | inc dword ptr [ebp - 0x215c] // 80bda3deffff00 | cmp byte ptr [ebp - 0x215d], 0 // 75e2 | jne 0xffffffe4 // 8bbda4deffff | mov edi, dword ptr [ebp - 0x215c] // be???????? | $sequence_8 = { 80bdcbfbffff00 75e3 8b85d0fbffff 2b85ccfbffff 8b8dccfbffff 898dc4fbffff 8985c0fbffff } // n = 7, score = 100 // 80bdcbfbffff00 | cmp byte ptr [ebp - 0x435], 0 // 75e3 | jne 0xffffffe5 // 8b85d0fbffff | mov eax, dword ptr [ebp - 0x430] // 2b85ccfbffff | sub eax, dword ptr [ebp - 0x434] // 8b8dccfbffff | mov ecx, dword ptr [ebp - 0x434] // 898dc4fbffff | mov dword ptr [ebp - 0x43c], ecx // 8985c0fbffff | mov dword ptr [ebp - 0x440], eax $sequence_9 = { 89857cdeffff 8b857cdeffff 8a4001 88857bdeffff ff857cdeffff 80bd7bdeffff00 75e2 } // n = 7, score = 100 // 89857cdeffff | mov dword ptr [ebp - 0x2184], eax // 8b857cdeffff | mov eax, dword ptr [ebp - 0x2184] // 8a4001 | mov al, byte ptr [eax + 1] // 88857bdeffff | mov byte ptr [ebp - 0x2185], al // ff857cdeffff | inc dword ptr [ebp - 0x2184] // 80bd7bdeffff00 | cmp byte ptr [ebp - 0x2185], 0 // 75e2 | jne 0xffffffe4 condition: 7 of them and filesize < 139264 }
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