Unidentified downloader, possibly related to KONNI.
rule win_unidentified_070_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2026-01-05" version = "1" description = "Detects win.unidentified_070." 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.unidentified_070" malpedia_rule_date = "20260105" malpedia_hash = "19b79e7cab4eaf532122e5b45a77dd8f6bb5cc79" malpedia_version = "20251219" 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 = { 6a00 6a00 6a00 6a04 50 ff15???????? 8945fc } // n = 7, score = 300 // 6a00 | push 0 // 6a00 | push 0 // 6a00 | push 0 // 6a04 | push 4 // 50 | push eax // ff15???????? | // 8945fc | mov dword ptr [ebp - 4], eax $sequence_1 = { 6a04 50 ff15???????? 8945fc 85c0 } // n = 5, score = 300 // 6a04 | push 4 // 50 | push eax // ff15???????? | // 8945fc | mov dword ptr [ebp - 4], eax // 85c0 | test eax, eax $sequence_2 = { 6a00 6a00 6a04 50 ff15???????? 8945fc 85c0 } // n = 7, score = 300 // 6a00 | push 0 // 6a00 | push 0 // 6a04 | push 4 // 50 | push eax // ff15???????? | // 8945fc | mov dword ptr [ebp - 4], eax // 85c0 | test eax, eax $sequence_3 = { 6a00 6a04 50 ff15???????? 8945fc 85c0 } // n = 6, score = 300 // 6a00 | push 0 // 6a04 | push 4 // 50 | push eax // ff15???????? | // 8945fc | mov dword ptr [ebp - 4], eax // 85c0 | test eax, eax $sequence_4 = { 6a00 6a04 50 ff15???????? 8945fc } // n = 5, score = 300 // 6a00 | push 0 // 6a04 | push 4 // 50 | push eax // ff15???????? | // 8945fc | mov dword ptr [ebp - 4], eax $sequence_5 = { 33c0 c20400 3b0d???????? 7502 } // n = 4, score = 300 // 33c0 | xor eax, eax // c20400 | ret 4 // 3b0d???????? | // 7502 | jne 4 $sequence_6 = { 6a00 6a00 6a04 50 ff15???????? 8945fc } // n = 6, score = 300 // 6a00 | push 0 // 6a00 | push 0 // 6a04 | push 4 // 50 | push eax // ff15???????? | // 8945fc | mov dword ptr [ebp - 4], eax $sequence_7 = { 83f8ff 50 0f95c3 ff15???????? 8d85f4fdffff } // n = 5, score = 200 // 83f8ff | cmp eax, -1 // 50 | push eax // 0f95c3 | setne bl // ff15???????? | // 8d85f4fdffff | lea eax, [ebp - 0x20c] $sequence_8 = { 6a00 6a00 6800200000 6a01 8d8424e8000000 } // n = 5, score = 200 // 6a00 | push 0 // 6a00 | push 0 // 6800200000 | push 0x2000 // 6a01 | push 1 // 8d8424e8000000 | lea eax, [esp + 0xe8] $sequence_9 = { 6a00 6a00 68???????? 8d85f4fdffff 50 6a00 } // n = 6, score = 200 // 6a00 | push 0 // 6a00 | push 0 // 68???????? | // 8d85f4fdffff | lea eax, [ebp - 0x20c] // 50 | push eax // 6a00 | push 0 condition: 7 of them and filesize < 90112 }
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