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rule win_getmypass_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.getmypass." 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.getmypass" 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 = { 8b55e0 0fbe02 83f85e 0f856d010000 } // n = 4, score = 200 // 8b55e0 | mov edx, dword ptr [ebp - 0x20] // 0fbe02 | movsx eax, byte ptr [edx] // 83f85e | cmp eax, 0x5e // 0f856d010000 | jne 0x173 $sequence_1 = { 8b55fc 83c201 8955fc ebcb 837dfc05 7e04 b001 } // n = 7, score = 200 // 8b55fc | mov edx, dword ptr [ebp - 4] // 83c201 | add edx, 1 // 8955fc | mov dword ptr [ebp - 4], edx // ebcb | jmp 0xffffffcd // 837dfc05 | cmp dword ptr [ebp - 4], 5 // 7e04 | jle 6 // b001 | mov al, 1 $sequence_2 = { 3b450c 7374 8b4df4 83c101 81e1ff000000 } // n = 5, score = 200 // 3b450c | cmp eax, dword ptr [ebp + 0xc] // 7374 | jae 0x76 // 8b4df4 | mov ecx, dword ptr [ebp - 0xc] // 83c101 | add ecx, 1 // 81e1ff000000 | and ecx, 0xff $sequence_3 = { e8???????? 83c404 0fb6c8 85c9 0f8430010000 8b5508 52 } // n = 7, score = 200 // e8???????? | // 83c404 | add esp, 4 // 0fb6c8 | movzx ecx, al // 85c9 | test ecx, ecx // 0f8430010000 | je 0x136 // 8b5508 | mov edx, dword ptr [ebp + 8] // 52 | push edx $sequence_4 = { 894df4 8b55e8 0355f4 0fb602 8945fc 8b4df8 034dfc } // n = 7, score = 200 // 894df4 | mov dword ptr [ebp - 0xc], ecx // 8b55e8 | mov edx, dword ptr [ebp - 0x18] // 0355f4 | add edx, dword ptr [ebp - 0xc] // 0fb602 | movzx eax, byte ptr [edx] // 8945fc | mov dword ptr [ebp - 4], eax // 8b4df8 | mov ecx, dword ptr [ebp - 8] // 034dfc | add ecx, dword ptr [ebp - 4] $sequence_5 = { 8bec 83ec08 894df8 c645ff01 837d0800 750d 8b4df8 } // n = 7, score = 200 // 8bec | mov ebp, esp // 83ec08 | sub esp, 8 // 894df8 | mov dword ptr [ebp - 8], ecx // c645ff01 | mov byte ptr [ebp - 1], 1 // 837d0800 | cmp dword ptr [ebp + 8], 0 // 750d | jne 0xf // 8b4df8 | mov ecx, dword ptr [ebp - 8] $sequence_6 = { 6800020000 68???????? ff15???????? 8d95f8fbffff 52 } // n = 5, score = 200 // 6800020000 | push 0x200 // 68???????? | // ff15???????? | // 8d95f8fbffff | lea edx, [ebp - 0x408] // 52 | push edx $sequence_7 = { 83c408 8945fc 837dfc00 7463 8b45fc } // n = 5, score = 200 // 83c408 | add esp, 8 // 8945fc | mov dword ptr [ebp - 4], eax // 837dfc00 | cmp dword ptr [ebp - 4], 0 // 7463 | je 0x65 // 8b45fc | mov eax, dword ptr [ebp - 4] $sequence_8 = { 83c408 85c0 0f8403010000 6800020000 8d95e8f9ffff 52 } // n = 6, score = 200 // 83c408 | add esp, 8 // 85c0 | test eax, eax // 0f8403010000 | je 0x109 // 6800020000 | push 0x200 // 8d95e8f9ffff | lea edx, [ebp - 0x618] // 52 | push edx $sequence_9 = { 51 c745fc00000000 8b45fc 833c852040400000 7428 } // n = 5, score = 200 // 51 | push ecx // c745fc00000000 | mov dword ptr [ebp - 4], 0 // 8b45fc | mov eax, dword ptr [ebp - 4] // 833c852040400000 | cmp dword ptr [eax*4 + 0x404020], 0 // 7428 | je 0x2a condition: 7 of them and filesize < 49152 }
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