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rule win_micrass_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.micrass." 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.micrass" malpedia_rule_date = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { 8bf9 c1e704 037ddc 33c7 8b7dfc 8145fc4786c861 03f9 } // n = 7, score = 100 // 8bf9 | mov edi, ecx // c1e704 | shl edi, 4 // 037ddc | add edi, dword ptr [ebp - 0x24] // 33c7 | xor eax, edi // 8b7dfc | mov edi, dword ptr [ebp - 4] // 8145fc4786c861 | add dword ptr [ebp - 4], 0x61c88647 // 03f9 | add edi, ecx $sequence_1 = { 8b45f4 8b4c1004 c745fc2037efc6 c745f020000000 8bc6 } // n = 5, score = 100 // 8b45f4 | mov eax, dword ptr [ebp - 0xc] // 8b4c1004 | mov ecx, dword ptr [eax + edx + 4] // c745fc2037efc6 | mov dword ptr [ebp - 4], 0xc6ef3720 // c745f020000000 | mov dword ptr [ebp - 0x10], 0x20 // 8bc6 | mov eax, esi $sequence_2 = { 8b8514faffff 40 898514faffff 83bd14faffff12 } // n = 4, score = 100 // 8b8514faffff | mov eax, dword ptr [ebp - 0x5ec] // 40 | inc eax // 898514faffff | mov dword ptr [ebp - 0x5ec], eax // 83bd14faffff12 | cmp dword ptr [ebp - 0x5ec], 0x12 $sequence_3 = { 2b34bda0dd4000 c1fe06 8bc7 c1e005 } // n = 4, score = 100 // 2b34bda0dd4000 | sub esi, dword ptr [edi*4 + 0x40dda0] // c1fe06 | sar esi, 6 // 8bc7 | mov eax, edi // c1e005 | shl eax, 5 $sequence_4 = { 8bd1 c1fa05 c1e006 030495a0dd4000 eb05 b8???????? } // n = 6, score = 100 // 8bd1 | mov edx, ecx // c1fa05 | sar edx, 5 // c1e006 | shl eax, 6 // 030495a0dd4000 | add eax, dword ptr [edx*4 + 0x40dda0] // eb05 | jmp 7 // b8???????? | $sequence_5 = { a3???????? 0f95c0 8b4dfc 5f 5e 33cd } // n = 6, score = 100 // a3???????? | // 0f95c0 | setne al // 8b4dfc | mov ecx, dword ptr [ebp - 4] // 5f | pop edi // 5e | pop esi // 33cd | xor ecx, ebp $sequence_6 = { ff2485ef444000 33c0 838df4fbffffff 8985a0fbffff } // n = 4, score = 100 // ff2485ef444000 | jmp dword ptr [eax*4 + 0x4044ef] // 33c0 | xor eax, eax // 838df4fbffffff | or dword ptr [ebp - 0x40c], 0xffffffff // 8985a0fbffff | mov dword ptr [ebp - 0x460], eax $sequence_7 = { ff15???????? 6804010000 57 53 e8???????? 83c40c } // n = 6, score = 100 // ff15???????? | // 6804010000 | push 0x104 // 57 | push edi // 53 | push ebx // e8???????? | // 83c40c | add esp, 0xc $sequence_8 = { 8d45c4 50 68???????? 56 ff15???????? 85c0 741b } // n = 7, score = 100 // 8d45c4 | lea eax, [ebp - 0x3c] // 50 | push eax // 68???????? | // 56 | push esi // ff15???????? | // 85c0 | test eax, eax // 741b | je 0x1d $sequence_9 = { 8d851cfeffff 50 57 ffd6 a3???????? 391d???????? } // n = 6, score = 100 // 8d851cfeffff | lea eax, [ebp - 0x1e4] // 50 | push eax // 57 | push edi // ffd6 | call esi // a3???????? | // 391d???????? | condition: 7 of them and filesize < 163840 }
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