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rule win_pittytiger_rat_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.pittytiger_rat." 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.pittytiger_rat" 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 = { 897dfc 817de8ea000000 0f8433ffffff 68???????? ff750c } // n = 5, score = 100 // 897dfc | mov dword ptr [ebp - 4], edi // 817de8ea000000 | cmp dword ptr [ebp - 0x18], 0xea // 0f8433ffffff | je 0xffffff39 // 68???????? | // ff750c | push dword ptr [ebp + 0xc] $sequence_1 = { 8b9eac010000 83c430 85db 744f 8d4304 50 } // n = 6, score = 100 // 8b9eac010000 | mov ebx, dword ptr [esi + 0x1ac] // 83c430 | add esp, 0x30 // 85db | test ebx, ebx // 744f | je 0x51 // 8d4304 | lea eax, [ebx + 4] // 50 | push eax $sequence_2 = { 8945fc 0f84cf000000 8b75fc 6a00 6a01 6a02 } // n = 6, score = 100 // 8945fc | mov dword ptr [ebp - 4], eax // 0f84cf000000 | je 0xd5 // 8b75fc | mov esi, dword ptr [ebp - 4] // 6a00 | push 0 // 6a01 | push 1 // 6a02 | push 2 $sequence_3 = { 6802020000 ff15???????? 85c0 0f853a020000 8b35???????? } // n = 5, score = 100 // 6802020000 | push 0x202 // ff15???????? | // 85c0 | test eax, eax // 0f853a020000 | jne 0x240 // 8b35???????? | $sequence_4 = { eb30 6a02 53 53 ff75fc ff15???????? } // n = 6, score = 100 // eb30 | jmp 0x32 // 6a02 | push 2 // 53 | push ebx // 53 | push ebx // ff75fc | push dword ptr [ebp - 4] // ff15???????? | $sequence_5 = { 3bc3 a3???????? 0f8476ffffff 8d459c c745ac65416500 50 } // n = 6, score = 100 // 3bc3 | cmp eax, ebx // a3???????? | // 0f8476ffffff | je 0xffffff7c // 8d459c | lea eax, [ebp - 0x64] // c745ac65416500 | mov dword ptr [ebp - 0x54], 0x654165 // 50 | push eax $sequence_6 = { ff15???????? 50 68???????? ff750c ff15???????? 83c410 33c0 } // n = 7, score = 100 // ff15???????? | // 50 | push eax // 68???????? | // ff750c | push dword ptr [ebp + 0xc] // ff15???????? | // 83c410 | add esp, 0x10 // 33c0 | xor eax, eax $sequence_7 = { c7459c57726974 c745a06546696c 885da5 ffd6 3bc3 a3???????? 74d1 } // n = 7, score = 100 // c7459c57726974 | mov dword ptr [ebp - 0x64], 0x74697257 // c745a06546696c | mov dword ptr [ebp - 0x60], 0x6c694665 // 885da5 | mov byte ptr [ebp - 0x5b], bl // ffd6 | call esi // 3bc3 | cmp eax, ebx // a3???????? | // 74d1 | je 0xffffffd3 $sequence_8 = { be00010000 aa 56 8d85d0fdffff } // n = 4, score = 100 // be00010000 | mov esi, 0x100 // aa | stosb byte ptr es:[edi], al // 56 | push esi // 8d85d0fdffff | lea eax, [ebp - 0x230] $sequence_9 = { 744f 8d4304 50 8d85f8fbffff 68???????? 50 } // n = 6, score = 100 // 744f | je 0x51 // 8d4304 | lea eax, [ebx + 4] // 50 | push eax // 8d85f8fbffff | lea eax, [ebp - 0x408] // 68???????? | // 50 | push eax condition: 7 of them and filesize < 2162688 }
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