There is no description at this point.
rule win_bitter_rat_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" 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 = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = { 8bf4 6830750000 ff15???????? 3bf4 e8???????? e9???????? } // n = 6, score = 200 // 8bf4 | mov esi, esp // 6830750000 | push 0x7530 // ff15???????? | // 3bf4 | cmp esi, esp // e8???????? | // e9???????? | $sequence_1 = { e8???????? 8d856cf8ffff 50 8b8da8feffff 51 e8???????? } // n = 6, score = 200 // e8???????? | // 8d856cf8ffff | lea eax, [ebp - 0x794] // 50 | push eax // 8b8da8feffff | mov ecx, dword ptr [ebp - 0x158] // 51 | push ecx // e8???????? | $sequence_2 = { ff15???????? 3bf4 e8???????? 898574d8ffff 8bf4 8d858cd8ffff } // n = 6, score = 200 // ff15???????? | // 3bf4 | cmp esi, esp // e8???????? | // 898574d8ffff | mov dword ptr [ebp - 0x278c], eax // 8bf4 | mov esi, esp // 8d858cd8ffff | lea eax, [ebp - 0x2774] $sequence_3 = { 83c408 8d85fcd8ffff 50 e8???????? 83c404 898558d9ffff 8b8558d9ffff } // n = 7, score = 200 // 83c408 | add esp, 8 // 8d85fcd8ffff | lea eax, [ebp - 0x2704] // 50 | push eax // e8???????? | // 83c404 | add esp, 4 // 898558d9ffff | mov dword ptr [ebp - 0x26a8], eax // 8b8558d9ffff | mov eax, dword ptr [ebp - 0x26a8] $sequence_4 = { ff15???????? 3bf4 e8???????? 8945a0 8bf4 6a01 } // n = 6, score = 200 // ff15???????? | // 3bf4 | cmp esi, esp // e8???????? | // 8945a0 | mov dword ptr [ebp - 0x60], eax // 8bf4 | mov esi, esp // 6a01 | push 1 $sequence_5 = { eb12 8b45f4 83e801 8945f4 8b4de8 83c101 894de8 } // n = 7, score = 200 // eb12 | jmp 0x14 // 8b45f4 | mov eax, dword ptr [ebp - 0xc] // 83e801 | sub eax, 1 // 8945f4 | mov dword ptr [ebp - 0xc], eax // 8b4de8 | mov ecx, dword ptr [ebp - 0x18] // 83c101 | add ecx, 1 // 894de8 | mov dword ptr [ebp - 0x18], ecx $sequence_6 = { 89859cdbffff 8b8d9cdbffff 81e9d3070000 898d9cdbffff 83bd9cdbffff15 0f872b020000 8b959cdbffff } // n = 7, score = 200 // 89859cdbffff | mov dword ptr [ebp - 0x2464], eax // 8b8d9cdbffff | mov ecx, dword ptr [ebp - 0x2464] // 81e9d3070000 | sub ecx, 0x7d3 // 898d9cdbffff | mov dword ptr [ebp - 0x2464], ecx // 83bd9cdbffff15 | cmp dword ptr [ebp - 0x2464], 0x15 // 0f872b020000 | ja 0x231 // 8b959cdbffff | mov edx, dword ptr [ebp - 0x2464] $sequence_7 = { 8d1c8d00124700 8bf0 83e61f c1e606 8b0b 0fbe4c3104 83e101 } // n = 7, score = 200 // 8d1c8d00124700 | lea ebx, [ecx*4 + 0x471200] // 8bf0 | mov esi, eax // 83e61f | and esi, 0x1f // c1e606 | shl esi, 6 // 8b0b | mov ecx, dword ptr [ebx] // 0fbe4c3104 | movsx ecx, byte ptr [ecx + esi + 4] // 83e101 | and ecx, 1 $sequence_8 = { e8???????? 83c404 85c0 7420 e8???????? 8bf4 68d0070000 } // n = 7, score = 200 // e8???????? | // 83c404 | add esp, 4 // 85c0 | test eax, eax // 7420 | je 0x22 // e8???????? | // 8bf4 | mov esi, esp // 68d0070000 | push 0x7d0 $sequence_9 = { 3b05???????? 0f8688000000 a1???????? d1e0 3945f8 760b 8b4df8 } // n = 7, score = 200 // 3b05???????? | // 0f8688000000 | jbe 0x8e // a1???????? | // d1e0 | shl eax, 1 // 3945f8 | cmp dword ptr [ebp - 8], eax // 760b | jbe 0xd // 8b4df8 | mov ecx, dword ptr [ebp - 8] condition: 7 of them and filesize < 1130496 }
If your designated proposal does not fit in any other category, feel free to write a free-text in the comment field below. Changes regarding references should be proposed on the Malpedia library page.
Your suggestion will be reviewed before being published. Thank you for contributing!
YYYY-MM-DD
YYYY-MM
YYYY