Actor(s): Tonto Team
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rule win_calmthorn_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.calmthorn." 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.calmthorn" 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 = { ff15???????? 8bf0 83feff 74c2 6a02 6a00 6a00 } // n = 7, score = 100 // ff15???????? | // 8bf0 | mov esi, eax // 83feff | cmp esi, -1 // 74c2 | je 0xffffffc4 // 6a02 | push 2 // 6a00 | push 0 // 6a00 | push 0 $sequence_1 = { ebba 0fb68d2cfdffff 83f901 7552 c785a0c2ffff00000000 eb0f 8b95a0c2ffff } // n = 7, score = 100 // ebba | jmp 0xffffffbc // 0fb68d2cfdffff | movzx ecx, byte ptr [ebp - 0x2d4] // 83f901 | cmp ecx, 1 // 7552 | jne 0x54 // c785a0c2ffff00000000 | mov dword ptr [ebp - 0x3d60], 0 // eb0f | jmp 0x11 // 8b95a0c2ffff | mov edx, dword ptr [ebp - 0x3d60] $sequence_2 = { ff7590 ff15???????? b801000000 5f 5e 5b 8b4dfc } // n = 7, score = 100 // ff7590 | push dword ptr [ebp - 0x70] // ff15???????? | // b801000000 | mov eax, 1 // 5f | pop edi // 5e | pop esi // 5b | pop ebx // 8b4dfc | mov ecx, dword ptr [ebp - 4] $sequence_3 = { eb1e 8b850452ffff 83c001 8b8d0852ffff 83d100 89850452ffff 898d0852ffff } // n = 7, score = 100 // eb1e | jmp 0x20 // 8b850452ffff | mov eax, dword ptr [ebp - 0xadfc] // 83c001 | add eax, 1 // 8b8d0852ffff | mov ecx, dword ptr [ebp - 0xadf8] // 83d100 | adc ecx, 0 // 89850452ffff | mov dword ptr [ebp - 0xadfc], eax // 898d0852ffff | mov dword ptr [ebp - 0xadf8], ecx $sequence_4 = { ebba 0fb68d21fdffff 83f901 7553 0f57c0 660f13850c2fffff eb1e } // n = 7, score = 100 // ebba | jmp 0xffffffbc // 0fb68d21fdffff | movzx ecx, byte ptr [ebp - 0x2df] // 83f901 | cmp ecx, 1 // 7553 | jne 0x55 // 0f57c0 | xorps xmm0, xmm0 // 660f13850c2fffff | movlpd qword ptr [ebp - 0xd0f4], xmm0 // eb1e | jmp 0x20 $sequence_5 = { ebba 0fb6953ffdffff 83fa01 7556 0f57c0 660f1385d451ffff eb1e } // n = 7, score = 100 // ebba | jmp 0xffffffbc // 0fb6953ffdffff | movzx edx, byte ptr [ebp - 0x2c1] // 83fa01 | cmp edx, 1 // 7556 | jne 0x58 // 0f57c0 | xorps xmm0, xmm0 // 660f1385d451ffff | movlpd qword ptr [ebp - 0xae2c], xmm0 // eb1e | jmp 0x20 $sequence_6 = { ebba 0fb69509fdffff 83fa01 7556 0f57c0 660f138574fdfeff eb1e } // n = 7, score = 100 // ebba | jmp 0xffffffbc // 0fb69509fdffff | movzx edx, byte ptr [ebp - 0x2f7] // 83fa01 | cmp edx, 1 // 7556 | jne 0x58 // 0f57c0 | xorps xmm0, xmm0 // 660f138574fdfeff | movlpd qword ptr [ebp - 0x1028c], xmm0 // eb1e | jmp 0x20 $sequence_7 = { ebba 0fb6952cfdffff 83fa01 7552 c7850cbfffff00000000 eb0f 8b850cbfffff } // n = 7, score = 100 // ebba | jmp 0xffffffbc // 0fb6952cfdffff | movzx edx, byte ptr [ebp - 0x2d4] // 83fa01 | cmp edx, 1 // 7552 | jne 0x54 // c7850cbfffff00000000 | mov dword ptr [ebp - 0x40f4], 0 // eb0f | jmp 0x11 // 8b850cbfffff | mov eax, dword ptr [ebp - 0x40f4] $sequence_8 = { eb02 ebba 0fb68d73fdffff 83f901 7553 0f57c0 660f1385947cffff } // n = 7, score = 100 // eb02 | jmp 4 // ebba | jmp 0xffffffbc // 0fb68d73fdffff | movzx ecx, byte ptr [ebp - 0x28d] // 83f901 | cmp ecx, 1 // 7553 | jne 0x55 // 0f57c0 | xorps xmm0, xmm0 // 660f1385947cffff | movlpd qword ptr [ebp - 0x836c], xmm0 $sequence_9 = { ebb7 0fb69521fdffff 83fa01 7552 c785c8b8ffff00000000 eb0f 8b85c8b8ffff } // n = 7, score = 100 // ebb7 | jmp 0xffffffb9 // 0fb69521fdffff | movzx edx, byte ptr [ebp - 0x2df] // 83fa01 | cmp edx, 1 // 7552 | jne 0x54 // c785c8b8ffff00000000 | mov dword ptr [ebp - 0x4738], 0 // eb0f | jmp 0x11 // 8b85c8b8ffff | mov eax, dword ptr [ebp - 0x4738] condition: 7 of them and filesize < 2322432 }
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