There is no description at this point.
rule win_kronos_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.kronos." 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.kronos" 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 = { 85f6 742f 8d45fc 50 ff75fc 56 6a1b } // n = 7, score = 2800 // 85f6 | test esi, esi // 742f | je 0x31 // 8d45fc | lea eax, [ebp - 4] // 50 | push eax // ff75fc | push dword ptr [ebp - 4] // 56 | push esi // 6a1b | push 0x1b $sequence_1 = { 8911 8b08 85c9 7406 8b5004 895104 3b4604 } // n = 7, score = 2800 // 8911 | mov dword ptr [ecx], edx // 8b08 | mov ecx, dword ptr [eax] // 85c9 | test ecx, ecx // 7406 | je 8 // 8b5004 | mov edx, dword ptr [eax + 4] // 895104 | mov dword ptr [ecx + 4], edx // 3b4604 | cmp eax, dword ptr [esi + 4] $sequence_2 = { c6470501 85c0 750d 8906 5f 8bc6 5e } // n = 7, score = 2800 // c6470501 | mov byte ptr [edi + 5], 1 // 85c0 | test eax, eax // 750d | jne 0xf // 8906 | mov dword ptr [esi], eax // 5f | pop edi // 8bc6 | mov eax, esi // 5e | pop esi $sequence_3 = { 8bf8 83ffff 7470 6a18 } // n = 4, score = 2800 // 8bf8 | mov edi, eax // 83ffff | cmp edi, -1 // 7470 | je 0x72 // 6a18 | push 0x18 $sequence_4 = { ffd2 8b08 8b5804 8b5008 8b4508 53 894df4 } // n = 7, score = 2800 // ffd2 | call edx // 8b08 | mov ecx, dword ptr [eax] // 8b5804 | mov ebx, dword ptr [eax + 4] // 8b5008 | mov edx, dword ptr [eax + 8] // 8b4508 | mov eax, dword ptr [ebp + 8] // 53 | push ebx // 894df4 | mov dword ptr [ebp - 0xc], ecx $sequence_5 = { 53 33c0 57 8d4df0 8945f4 8945f8 } // n = 6, score = 2800 // 53 | push ebx // 33c0 | xor eax, eax // 57 | push edi // 8d4df0 | lea ecx, [ebp - 0x10] // 8945f4 | mov dword ptr [ebp - 0xc], eax // 8945f8 | mov dword ptr [ebp - 8], eax $sequence_6 = { 6800400000 6800200000 57 52 ffd6 8b4508 } // n = 6, score = 2800 // 6800400000 | push 0x4000 // 6800200000 | push 0x2000 // 57 | push edi // 52 | push edx // ffd6 | call esi // 8b4508 | mov eax, dword ptr [ebp + 8] $sequence_7 = { 8a08 84c9 742f 80f95c 740a 80f92f } // n = 6, score = 2800 // 8a08 | mov cl, byte ptr [eax] // 84c9 | test cl, cl // 742f | je 0x31 // 80f95c | cmp cl, 0x5c // 740a | je 0xc // 80f92f | cmp cl, 0x2f $sequence_8 = { 33c0 85d2 7e37 3b7b18 773b eb1a 8b4d08 } // n = 7, score = 2800 // 33c0 | xor eax, eax // 85d2 | test edx, edx // 7e37 | jle 0x39 // 3b7b18 | cmp edi, dword ptr [ebx + 0x18] // 773b | ja 0x3d // eb1a | jmp 0x1c // 8b4d08 | mov ecx, dword ptr [ebp + 8] $sequence_9 = { 83f801 74d1 56 ff15???????? 33c0 5f 5e } // n = 7, score = 2800 // 83f801 | cmp eax, 1 // 74d1 | je 0xffffffd3 // 56 | push esi // ff15???????? | // 33c0 | xor eax, eax // 5f | pop edi // 5e | pop esi condition: 7 of them and filesize < 1302528 }
If your designated proposal does not fit in any other category, feel free to write a free-text in the comment field below.
Please propose all changes regarding references on the Malpedia library page
Your suggestion will be reviewed before being published. Thank you for contributing!
YYYY-MM-DD
YYYY-MM
YYYY