YARA · Malpedia signator rules
MALPEDIA_Win_Nocturnalstealer_Auto
autogenerated rule brought to you by yara-signator
MalwareNocturnalstealerMalpedia signator rulesCreative Commons Attribution-ShareAlike 4.0Compiles with YARA-X
- Author
- Felix Bilstein - yara-signator at cocacoding dot com
- Date
- 2026-05-04
- Modified
- 2026-05-18
- Score / Quality
- 75 / 75
What this rule detects
autogenerated rule brought to you by yara-signator
Associated malware family: Nocturnalstealer.
It defines 10 patterns (0 text, 10 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-nocturnalstealer-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Nocturnalstealer_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "5964c83b-5a1b-5913-a49a-303693a90164"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.nocturnalstealer"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.nocturnalstealer_auto.yar#L1-L134"
= "N/A"
= "c662283be69db4ef7dfe1019eca1797cdbfc6ecd9828799d75f57c47594f7be3"
= 75
= 75
= "FILE"
= "1"
= "yara-signator v0.6.0"
= "callsandjumps;datarefs;binvalue"
= "20260422"
= "a182e35da64e6d71cb55f125c4d4225196523f14"
= "20260504"
= "CC BY-SA 4.0"
= "TLP:WHITE"
strings:
$sequence_0 = { e9???????? bd01000000 81c717a0fb5f 01ef 81ef17a0fb5f 5d 81e7cfaad32f }
$sequence_1 = { d280e1f107c3 7dbf 41 6c 46 3f a984011afd }
$sequence_2 = { e9???????? 51 b9dd9abe6f 31c8 59 05f1eb6f2f 05b354dc74 }
$sequence_3 = { e9???????? bb74bcf36f f7d3 4b 81cb108dfb7b 81e337e4f765 55 }
$sequence_4 = { c70424009d1a20 891424 ba77a7ee3f 89d3 8b1424 53 89e3 }
$sequence_5 = { e9???????? 58 81c404000000 e9???????? 81f6d544f73f 58 81eb4703df3d }
$sequence_6 = { ff3424 8b0c24 57 e9???????? 58 051ff53d3f 01c6 }
$sequence_7 = { f7d0 2d612e2f1b 053325461d 89c2 58 01542404 5a }
$sequence_8 = { e9???????? 8365d800 c745dcfedf4900 a1???????? 8d4dd8 33c1 8945e0 }
$sequence_9 = { e9???????? 81f2209cfd37 81eaf4ffef7d 81c2d90dace9 e9???????? 890c24 812c2439bc9f73 }
condition:
7 of them and filesize < 10739712
}
Strings (10 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { e9???????? bd01000000 81c717a0fb5f 01ef 81ef17a0fb5f 5d 81e7cfaad32f } | |
| $sequence_1 | hex | { d280e1f107c3 7dbf 41 6c 46 3f a984011afd } | |
| $sequence_2 | hex | { e9???????? 51 b9dd9abe6f 31c8 59 05f1eb6f2f 05b354dc74 } | |
| $sequence_3 | hex | { e9???????? bb74bcf36f f7d3 4b 81cb108dfb7b 81e337e4f765 55 } | |
| $sequence_4 | hex | { c70424009d1a20 891424 ba77a7ee3f 89d3 8b1424 53 89e3 } | |
| $sequence_5 | hex | { e9???????? 58 81c404000000 e9???????? 81f6d544f73f 58 81eb4703df3d } | |
| $sequence_6 | hex | { ff3424 8b0c24 57 e9???????? 58 051ff53d3f 01c6 } | |
| $sequence_7 | hex | { f7d0 2d612e2f1b 053325461d 89c2 58 01542404 5a } | |
| $sequence_8 | hex | { e9???????? 8365d800 c745dcfedf4900 a1???????? 8d4dd8 33c1 8945e0 } | |
| $sequence_9 | hex | { e9???????? 81f2209cfd37 81eaf4ffef7d 81c2d90dace9 e9???????? 890c24 812c2439bc9f73 } |
Condition
7 of them and filesize < 10739712In plain words (Heuristic)
- The file must be smaller than 10739712 (a cheap guard that skips large files).
- At least 7 patterns in the rule must match.
Test this rule in your browser
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Drop a file here or click to chooseScanned locally with YARA-X. Files up to 200 MB.
Licence & attribution
Author: Felix Bilstein - yara-signator at cocacoding dot com
Source repository: Malpedia signator rules @ c901f97b7d
Licence: Creative Commons Attribution-ShareAlike 4.0 (repository licence)
Mirrored via YARA Forge 20260927, which prefixes rule names with the source and adds normalised meta fields.
Rule id: 5964c83b-5a1b-5913-a49a-303693a90164
Metadata
| version | 1 |
|---|---|
| tool | yara-signator v0.6.0 |
| signator_config | callsandjumps;datarefs;binvalue |
| malpedia_rule_date | 20260422 |
| malpedia_hash | a182e35da64e6d71cb55f125c4d4225196523f14 |
| malpedia_version | 20260504 |
| malpedia_license | CC BY-SA 4.0 |
| malpedia_sharing | TLP:WHITE |
Tags:FILE
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