YARA · Malpedia signator rules
MALPEDIA_Win_Ntospy_Auto
autogenerated rule brought to you by yara-signator
- 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: Ntospy.
It defines 10 patterns (0 text, 10 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-ntospy-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Ntospy_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "8131d4ba-7ab9-5f25-bfe1-80fb81c429a4"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.ntospy"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.ntospy_auto.yar#L1-L117"
= "N/A"
= "8fbd4c5ffc79f2d95a93b5deb7321b5b82d08f35463db086df64bd3e92a52647"
= 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 = { 5f c3 48897c2408 488d3dacf90000 }
$sequence_1 = { eb74 85c9 7858 3b15???????? 7350 488bca 4c8d05e5b40000 }
$sequence_2 = { 8bfa 4c8d0d5d740000 488bd9 488d1553740000 b916000000 4c8d053f740000 e8???????? }
$sequence_3 = { b808000000 486bc000 488d0deaad0000 48c7040102000000 b808000000 }
$sequence_4 = { 48890d???????? 488d0512f50000 488d0d3bf70000 488905???????? 48890d???????? e8???????? }
$sequence_5 = { 4c8d0578760000 488d15016d0000 e8???????? 4885c0 740f 488bcb }
$sequence_6 = { f20f1000 8b5808 e9???????? 488d05dfc70000 4a8b0ce8 }
$sequence_7 = { 488d0d4c710000 8364242800 41b803000000 4533c9 }
$sequence_8 = { c3 4883ec28 e8???????? 488bc8 488d1501040100 }
$sequence_9 = { 4533f6 4863ce 488d3d20f90000 488bc1 }
condition:
7 of them and filesize < 208896
}
Strings (10 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { 5f c3 48897c2408 488d3dacf90000 } | |
| $sequence_1 | hex | { eb74 85c9 7858 3b15???????? 7350 488bca 4c8d05e5b40000 } | |
| $sequence_2 | hex | { 8bfa 4c8d0d5d740000 488bd9 488d1553740000 b916000000 4c8d053f740000 e8???????? } | |
| $sequence_3 | hex | { b808000000 486bc000 488d0deaad0000 48c7040102000000 b808000000 } | |
| $sequence_4 | hex | { 48890d???????? 488d0512f50000 488d0d3bf70000 488905???????? 48890d???????? e8???????? } | |
| $sequence_5 | hex | { 4c8d0578760000 488d15016d0000 e8???????? 4885c0 740f 488bcb } | |
| $sequence_6 | hex | { f20f1000 8b5808 e9???????? 488d05dfc70000 4a8b0ce8 } | |
| $sequence_7 | hex | { 488d0d4c710000 8364242800 41b803000000 4533c9 } | |
| $sequence_8 | hex | { c3 4883ec28 e8???????? 488bc8 488d1501040100 } | |
| $sequence_9 | hex | { 4533f6 4863ce 488d3d20f90000 488bc1 } |
Condition
7 of them and filesize < 208896In plain words (Heuristic)
- The file must be smaller than 208896 (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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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: 8131d4ba-7ab9-5f25-bfe1-80fb81c429a4
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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