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rule win_atmii_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.atmii." 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.atmii" 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 = { eb2a eb26 8b55fc 83c20d } // n = 4, score = 100 // eb2a | jmp 0x2c // eb26 | jmp 0x28 // 8b55fc | mov edx, dword ptr [ebp - 4] // 83c20d | add edx, 0xd $sequence_1 = { 68???????? 6a46 8845ff 8945f8 } // n = 4, score = 100 // 68???????? | // 6a46 | push 0x46 // 8845ff | mov byte ptr [ebp - 1], al // 8945f8 | mov dword ptr [ebp - 8], eax $sequence_2 = { 8a8500ffffff 57 8b3d???????? 884dfc 8d4dfc } // n = 5, score = 100 // 8a8500ffffff | mov al, byte ptr [ebp - 0x100] // 57 | push edi // 8b3d???????? | // 884dfc | mov byte ptr [ebp - 4], cl // 8d4dfc | lea ecx, [ebp - 4] $sequence_3 = { 7464 8b4e04 57 8b3d???????? 68???????? 51 ffd7 } // n = 7, score = 100 // 7464 | je 0x66 // 8b4e04 | mov ecx, dword ptr [esi + 4] // 57 | push edi // 8b3d???????? | // 68???????? | // 51 | push ecx // ffd7 | call edi $sequence_4 = { 897df8 e8???????? 83c40c 8b4df8 51 8d45d0 } // n = 6, score = 100 // 897df8 | mov dword ptr [ebp - 8], edi // e8???????? | // 83c40c | add esp, 0xc // 8b4df8 | mov ecx, dword ptr [ebp - 8] // 51 | push ecx // 8d45d0 | lea eax, [ebp - 0x30] $sequence_5 = { 680d020000 8d85fcfcffff 68???????? 50 ffd6 83c410 } // n = 6, score = 100 // 680d020000 | push 0x20d // 8d85fcfcffff | lea eax, [ebp - 0x304] // 68???????? | // 50 | push eax // ffd6 | call esi // 83c410 | add esp, 0x10 $sequence_6 = { 8d45b8 50 68???????? 68b6000000 } // n = 4, score = 100 // 8d45b8 | lea eax, [ebp - 0x48] // 50 | push eax // 68???????? | // 68b6000000 | push 0xb6 $sequence_7 = { ff15???????? 8b4dfc 8d45f8 50 } // n = 4, score = 100 // ff15???????? | // 8b4dfc | mov ecx, dword ptr [ebp - 4] // 8d45f8 | lea eax, [ebp - 8] // 50 | push eax $sequence_8 = { 85c0 750a 8b4dfc 8b5109 ffd2 } // n = 5, score = 100 // 85c0 | test eax, eax // 750a | jne 0xc // 8b4dfc | mov ecx, dword ptr [ebp - 4] // 8b5109 | mov edx, dword ptr [ecx + 9] // ffd2 | call edx $sequence_9 = { ff15???????? 85c0 7527 68???????? 689e000000 } // n = 5, score = 100 // ff15???????? | // 85c0 | test eax, eax // 7527 | jne 0x29 // 68???????? | // 689e000000 | push 0x9e $sequence_10 = { 8b45fc 50 e8???????? 83c404 56 ff15???????? 5f } // n = 7, score = 100 // 8b45fc | mov eax, dword ptr [ebp - 4] // 50 | push eax // e8???????? | // 83c404 | add esp, 4 // 56 | push esi // ff15???????? | // 5f | pop edi $sequence_11 = { ffd7 83c418 8d9d00feffff e8???????? } // n = 4, score = 100 // ffd7 | call edi // 83c418 | add esp, 0x18 // 8d9d00feffff | lea ebx, [ebp - 0x200] // e8???????? | $sequence_12 = { 7454 8b4dfc 0fb611 85d2 } // n = 4, score = 100 // 7454 | je 0x56 // 8b4dfc | mov ecx, dword ptr [ebp - 4] // 0fb611 | movzx edx, byte ptr [ecx] // 85d2 | test edx, edx $sequence_13 = { 6800020000 8d8d28fbffff 51 6a00 ff15???????? 50 } // n = 6, score = 100 // 6800020000 | push 0x200 // 8d8d28fbffff | lea ecx, [ebp - 0x4d8] // 51 | push ecx // 6a00 | push 0 // ff15???????? | // 50 | push eax $sequence_14 = { 8be5 5d c3 8b4e04 68???????? 51 ffd7 } // n = 7, score = 100 // 8be5 | mov esp, ebp // 5d | pop ebp // c3 | ret // 8b4e04 | mov ecx, dword ptr [esi + 4] // 68???????? | // 51 | push ecx // ffd7 | call edi $sequence_15 = { 5d c21400 68???????? 6869020000 8d8500feffff 68???????? } // n = 6, score = 100 // 5d | pop ebp // c21400 | ret 0x14 // 68???????? | // 6869020000 | push 0x269 // 8d8500feffff | lea eax, [ebp - 0x200] // 68???????? | condition: 7 of them and filesize < 49152 }
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