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rule win_jimmy_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" version = "1" description = "Detects win.jimmy." 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.jimmy" malpedia_rule_date = "20220513" malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26" malpedia_version = "20220516" 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 = { 7418 ff75f4 e8???????? 59 0fb6c0 85c0 } // n = 6, score = 400 // 7418 | je 0x1a // ff75f4 | push dword ptr [ebp - 0xc] // e8???????? | // 59 | pop ecx // 0fb6c0 | movzx eax, al // 85c0 | test eax, eax $sequence_1 = { 8985ccfdffff 83bdccfdffffff 750b 8a85cbfdffff e9???????? c785d0fdffff2c020000 8d85d0fdffff } // n = 7, score = 400 // 8985ccfdffff | mov dword ptr [ebp - 0x234], eax // 83bdccfdffffff | cmp dword ptr [ebp - 0x234], -1 // 750b | jne 0xd // 8a85cbfdffff | mov al, byte ptr [ebp - 0x235] // e9???????? | // c785d0fdffff2c020000 | mov dword ptr [ebp - 0x230], 0x22c // 8d85d0fdffff | lea eax, [ebp - 0x230] $sequence_2 = { 85c0 7502 eb08 c645ff01 33c0 7597 } // n = 6, score = 400 // 85c0 | test eax, eax // 7502 | jne 4 // eb08 | jmp 0xa // c645ff01 | mov byte ptr [ebp - 1], 1 // 33c0 | xor eax, eax // 7597 | jne 0xffffff99 $sequence_3 = { ff75fc e8???????? 59 8a45fb c9 c3 55 } // n = 7, score = 400 // ff75fc | push dword ptr [ebp - 4] // e8???????? | // 59 | pop ecx // 8a45fb | mov al, byte ptr [ebp - 5] // c9 | leave // c3 | ret // 55 | push ebp $sequence_4 = { 8365f800 8d45f8 50 6a00 ff7508 a1???????? ffb030010000 } // n = 7, score = 400 // 8365f800 | and dword ptr [ebp - 8], 0 // 8d45f8 | lea eax, [ebp - 8] // 50 | push eax // 6a00 | push 0 // ff7508 | push dword ptr [ebp + 8] // a1???????? | // ffb030010000 | push dword ptr [eax + 0x130] $sequence_5 = { 034878 894de0 8b45e0 8b4df8 034820 894de8 8b45e0 } // n = 7, score = 400 // 034878 | add ecx, dword ptr [eax + 0x78] // 894de0 | mov dword ptr [ebp - 0x20], ecx // 8b45e0 | mov eax, dword ptr [ebp - 0x20] // 8b4df8 | mov ecx, dword ptr [ebp - 8] // 034820 | add ecx, dword ptr [eax + 0x20] // 894de8 | mov dword ptr [ebp - 0x18], ecx // 8b45e0 | mov eax, dword ptr [ebp - 0x20] $sequence_6 = { c9 c3 55 8bec 83ec0c 6804010000 } // n = 6, score = 400 // c9 | leave // c3 | ret // 55 | push ebp // 8bec | mov ebp, esp // 83ec0c | sub esp, 0xc // 6804010000 | push 0x104 $sequence_7 = { 894dfc 83a594feffff00 eb0d 8b8594feffff 40 898594feffff } // n = 6, score = 400 // 894dfc | mov dword ptr [ebp - 4], ecx // 83a594feffff00 | and dword ptr [ebp - 0x16c], 0 // eb0d | jmp 0xf // 8b8594feffff | mov eax, dword ptr [ebp - 0x16c] // 40 | inc eax // 898594feffff | mov dword ptr [ebp - 0x16c], eax $sequence_8 = { 837df400 7507 32c0 e9???????? 8b45f0 } // n = 5, score = 400 // 837df400 | cmp dword ptr [ebp - 0xc], 0 // 7507 | jne 9 // 32c0 | xor al, al // e9???????? | // 8b45f0 | mov eax, dword ptr [ebp - 0x10] $sequence_9 = { c9 c3 55 8bec 83ec14 c645fb00 a1???????? } // n = 7, score = 400 // c9 | leave // c3 | ret // 55 | push ebp // 8bec | mov ebp, esp // 83ec14 | sub esp, 0x14 // c645fb00 | mov byte ptr [ebp - 5], 0 // a1???????? | condition: 7 of them and filesize < 188416 }
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