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rule win_bitter_rat_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.bitter_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.bitter_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 = { 2b34bd00124700 c1fe06 8bc7 c1e005 } // n = 4, score = 200 // 2b34bd00124700 | sub esi, dword ptr [edi*4 + 0x471200] // c1fe06 | sar esi, 6 // 8bc7 | mov eax, edi // c1e005 | shl eax, 5 $sequence_1 = { 83c404 83c001 50 e8???????? 83c404 8945f4 8d85dcfeffff } // n = 7, score = 200 // 83c404 | add esp, 4 // 83c001 | add eax, 1 // 50 | push eax // e8???????? | // 83c404 | add esp, 4 // 8945f4 | mov dword ptr [ebp - 0xc], eax // 8d85dcfeffff | lea eax, [ebp - 0x124] $sequence_2 = { 8b4df4 51 e8???????? 83c408 8bf4 8b8580edffff } // n = 6, score = 200 // 8b4df4 | mov ecx, dword ptr [ebp - 0xc] // 51 | push ecx // e8???????? | // 83c408 | add esp, 8 // 8bf4 | mov esi, esp // 8b8580edffff | mov eax, dword ptr [ebp - 0x1280] $sequence_3 = { ff34c52c3a4500 53 57 e8???????? 83c40c 85c0 740d } // n = 7, score = 200 // ff34c52c3a4500 | push dword ptr [eax*8 + 0x453a2c] // 53 | push ebx // 57 | push edi // e8???????? | // 83c40c | add esp, 0xc // 85c0 | test eax, eax // 740d | je 0xf $sequence_4 = { 8945fc 8bf4 8d8568feffff 50 6a02 ff15???????? 3bf4 } // n = 7, score = 200 // 8945fc | mov dword ptr [ebp - 4], eax // 8bf4 | mov esi, esp // 8d8568feffff | lea eax, [ebp - 0x198] // 50 | push eax // 6a02 | push 2 // ff15???????? | // 3bf4 | cmp esi, esp $sequence_5 = { 50 8d15c8324200 e8???????? 58 } // n = 4, score = 200 // 50 | push eax // 8d15c8324200 | lea edx, [0x4232c8] // e8???????? | // 58 | pop eax $sequence_6 = { e8???????? 6a0d 68???????? e8???????? 83c408 a1???????? } // n = 6, score = 200 // e8???????? | // 6a0d | push 0xd // 68???????? | // e8???????? | // 83c408 | add esp, 8 // a1???????? | $sequence_7 = { 6a01 68???????? 8b85e8feffff 2b85dcfeffff 05???????? 50 } // n = 6, score = 200 // 6a01 | push 1 // 68???????? | // 8b85e8feffff | mov eax, dword ptr [ebp - 0x118] // 2b85dcfeffff | sub eax, dword ptr [ebp - 0x124] // 05???????? | // 50 | push eax $sequence_8 = { 8bec b864240000 e8???????? 53 } // n = 4, score = 200 // 8bec | mov ebp, esp // b864240000 | mov eax, 0x2464 // e8???????? | // 53 | push ebx $sequence_9 = { eb44 8b8534f0ffff 50 8b8d9cfeffff 51 8d9510c9ffff 52 } // n = 7, score = 200 // eb44 | jmp 0x46 // 8b8534f0ffff | mov eax, dword ptr [ebp - 0xfcc] // 50 | push eax // 8b8d9cfeffff | mov ecx, dword ptr [ebp - 0x164] // 51 | push ecx // 8d9510c9ffff | lea edx, [ebp - 0x36f0] // 52 | push edx condition: 7 of them and filesize < 1130496 }
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