Actor(s): Tick
There is no description at this point.
rule win_rarstar_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" version = "1" description = "Detects win.rarstar." 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.rarstar" malpedia_rule_date = "20220405" malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a" malpedia_version = "20220411" 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 = { 745f 50 c705????????01000000 e8???????? } // n = 4, score = 100 // 745f | je 0x61 // 50 | push eax // c705????????01000000 | // e8???????? | $sequence_1 = { 83c40c 48 89442414 0f8544ffffff 8b4c2418 51 e8???????? } // n = 7, score = 100 // 83c40c | add esp, 0xc // 48 | dec eax // 89442414 | mov dword ptr [esp + 0x14], eax // 0f8544ffffff | jne 0xffffff4a // 8b4c2418 | mov ecx, dword ptr [esp + 0x18] // 51 | push ecx // e8???????? | $sequence_2 = { 8d6afe 33ff 8bc1 85ed 7e6f } // n = 5, score = 100 // 8d6afe | lea ebp, dword ptr [edx - 2] // 33ff | xor edi, edi // 8bc1 | mov eax, ecx // 85ed | test ebp, ebp // 7e6f | jle 0x71 $sequence_3 = { 56 57 b940000000 33c0 8d7c2420 c744241c74924000 } // n = 6, score = 100 // 56 | push esi // 57 | push edi // b940000000 | mov ecx, 0x40 // 33c0 | xor eax, eax // 8d7c2420 | lea edi, dword ptr [esp + 0x20] // c744241c74924000 | mov dword ptr [esp + 0x1c], 0x409274 $sequence_4 = { ff15???????? 8b3d???????? 8d942424040000 52 ffd7 8d84241c020000 } // n = 6, score = 100 // ff15???????? | // 8b3d???????? | // 8d942424040000 | lea edx, dword ptr [esp + 0x424] // 52 | push edx // ffd7 | call edi // 8d84241c020000 | lea eax, dword ptr [esp + 0x21c] $sequence_5 = { 81ce00ffffff 46 89b42424030000 8a10 8d743420 } // n = 5, score = 100 // 81ce00ffffff | or esi, 0xffffff00 // 46 | inc esi // 89b42424030000 | mov dword ptr [esp + 0x324], esi // 8a10 | mov dl, byte ptr [eax] // 8d743420 | lea esi, dword ptr [esp + esi + 0x20] $sequence_6 = { 50 68???????? 57 895c241c } // n = 4, score = 100 // 50 | push eax // 68???????? | // 57 | push edi // 895c241c | mov dword ptr [esp + 0x1c], ebx $sequence_7 = { f3ab bf???????? 83c9ff 33db 8d942424020000 } // n = 5, score = 100 // f3ab | rep stosd dword ptr es:[edi], eax // bf???????? | // 83c9ff | or ecx, 0xffffffff // 33db | xor ebx, ebx // 8d942424020000 | lea edx, dword ptr [esp + 0x224] $sequence_8 = { ffd6 8b442418 83ceff 3bc6 7403 56 ffd7 } // n = 7, score = 100 // ffd6 | call esi // 8b442418 | mov eax, dword ptr [esp + 0x18] // 83ceff | or esi, 0xffffffff // 3bc6 | cmp eax, esi // 7403 | je 5 // 56 | push esi // ffd7 | call edi $sequence_9 = { 8d4c2424 51 8d942484000000 6800100000 52 50 ffd5 } // n = 7, score = 100 // 8d4c2424 | lea ecx, dword ptr [esp + 0x24] // 51 | push ecx // 8d942484000000 | lea edx, dword ptr [esp + 0x84] // 6800100000 | push 0x1000 // 52 | push edx // 50 | push eax // ffd5 | call ebp condition: 7 of them and filesize < 122880 }
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