YARA · Malpedia signator rules
MALPEDIA_Win_Postnaptea_Auto
autogenerated rule brought to you by yara-signator
MalwarePostnapteaMalpedia 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: Postnaptea.
It defines 10 patterns (0 text, 10 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-postnaptea-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Postnaptea_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "2c2d9707-07ad-5243-85f1-210116caa2a9"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.postnaptea"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.postnaptea_auto.yar#L1-L134"
= "N/A"
= "5c2b930508b20d9de8e8f9b631eefff2fbcc2a62f0d5a8b36c9dc821d8d4ca8a"
= 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 = { e8???????? eb05 e8???????? 488d5550 488d4df0 e8???????? c1e81f }
$sequence_1 = { c745c40cf511f5 c745c815f546f5 c745cc0af50df5 c745d004f508f5 c745d40ef51ef5 c745d81ef506f5 c745dc06f500f5 }
$sequence_2 = { c7459410f511f5 c7459806f505f5 c7459c11f50df5 c745a015f516f5 c745a402f552f5 c745a877f574f5 33c0 }
$sequence_3 = { c7459059f540f5 c745945bf50000 660f1f840000000000 4863c2 488d4c2450 488d0c41 0fb7c2 }
$sequence_4 = { c785e005000010f552f5 c785e405000015f51df5 c785e805000019f513f5 c785ec05000057f51ef5 c785f005000018f513f5 c785f405000017f519f5 c785f805000019f55ef5 }
$sequence_5 = { 0f871b010000 488bce e8???????? 90 4983fd08 0f8208ffffff 4a8d146d02000000 }
$sequence_6 = { c7851c0b00000ef50bf5 c785200b000017f51ff5 c785240b00005df548f5 c785280b000020f504f5 c7852c0b00004bf539f5 c785300b00001ef50bf5 c785340b000055f50000 }
$sequence_7 = { e8???????? 488905???????? 498b4f18 ffd0 48898540010000 488b8dd8000000 488b01 }
$sequence_8 = { e8???????? 8bd6 488d4bd8 e8???????? 33d2 41b808020000 488d8d90050000 }
$sequence_9 = { e9???????? 4883fa10 722d 48ffc2 488b4d80 488bc1 4881fa00100000 }
condition:
7 of them and filesize < 2457600
}
Strings (10 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { e8???????? eb05 e8???????? 488d5550 488d4df0 e8???????? c1e81f } | |
| $sequence_1 | hex | { c745c40cf511f5 c745c815f546f5 c745cc0af50df5 c745d004f508f5 c745d40ef51ef5 c745d81ef506f5 c745dc06f500f5 } | |
| $sequence_2 | hex | { c7459410f511f5 c7459806f505f5 c7459c11f50df5 c745a015f516f5 c745a402f552f5 c745a877f574f5 33c0 } | |
| $sequence_3 | hex | { c7459059f540f5 c745945bf50000 660f1f840000000000 4863c2 488d4c2450 488d0c41 0fb7c2 } | |
| $sequence_4 | hex | { c785e005000010f552f5 c785e405000015f51df5 c785e805000019f513f5 c785ec05000057f51ef5 c785f005000018f513f5 c785f405000017f519f5 c785f805000019f55ef5 } | |
| $sequence_5 | hex | { 0f871b010000 488bce e8???????? 90 4983fd08 0f8208ffffff 4a8d146d02000000 } | |
| $sequence_6 | hex | { c7851c0b00000ef50bf5 c785200b000017f51ff5 c785240b00005df548f5 c785280b000020f504f5 c7852c0b00004bf539f5 c785300b00001ef50bf5 c785340b000055f50000 } | |
| $sequence_7 | hex | { e8???????? 488905???????? 498b4f18 ffd0 48898540010000 488b8dd8000000 488b01 } | |
| $sequence_8 | hex | { e8???????? 8bd6 488d4bd8 e8???????? 33d2 41b808020000 488d8d90050000 } | |
| $sequence_9 | hex | { e9???????? 4883fa10 722d 48ffc2 488b4d80 488bc1 4881fa00100000 } |
Condition
7 of them and filesize < 2457600In plain words (Heuristic)
- The file must be smaller than 2457600 (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: 2c2d9707-07ad-5243-85f1-210116caa2a9
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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