YARA · Malpedia signator rules
MALPEDIA_Win_Rctrl_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: Rctrl.
It defines 10 patterns (0 text, 10 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-rctrl-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Rctrl_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "957bfbd2-cd15-53c8-906d-2ba3b32154e0"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.rctrl"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.rctrl_auto.yar#L1-L128"
= "N/A"
= "41d67828bd5cd0d3a848db8c668a883d749583eba8e7c1da637587685e42750e"
= 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 = { ff500c 83c010 8906 8b5508 c745fc00000000 85d2 743a }
$sequence_1 = { 56 57 ff7518 8b7dfc ff7514 ff7510 }
$sequence_2 = { 59 59 5f ebc7 55 8bec }
$sequence_3 = { eb04 ddd8 33c0 5e 5d c20800 6a08 }
$sequence_4 = { 6a00 f3a5 50 e8???????? 8b8540f9ffff 8945b8 8d8530f5ffff }
$sequence_5 = { 5d c22000 33c0 c7410c01000000 894104 8901 894108 }
$sequence_6 = { 8b4508 33c9 668908 56 ff15???????? }
$sequence_7 = { b920030000 c78540ffffff681c5800 be90010000 899d44ffffff ba58020000 89b564ffffff }
$sequence_8 = { 8d0411 99 8bcb 2bc2 89bd70ffffff d1f8 89bd50ffffff }
$sequence_9 = { 85f6 7851 8b07 b901000000 2b48fc 8b40f8 }
condition:
7 of them and filesize < 4315136
}
Strings (10 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { ff500c 83c010 8906 8b5508 c745fc00000000 85d2 743a } | |
| $sequence_1 | hex | { 56 57 ff7518 8b7dfc ff7514 ff7510 } | |
| $sequence_2 | hex | { 59 59 5f ebc7 55 8bec } | |
| $sequence_3 | hex | { eb04 ddd8 33c0 5e 5d c20800 6a08 } | |
| $sequence_4 | hex | { 6a00 f3a5 50 e8???????? 8b8540f9ffff 8945b8 8d8530f5ffff } | |
| $sequence_5 | hex | { 5d c22000 33c0 c7410c01000000 894104 8901 894108 } | |
| $sequence_6 | hex | { 8b4508 33c9 668908 56 ff15???????? } | |
| $sequence_7 | hex | { b920030000 c78540ffffff681c5800 be90010000 899d44ffffff ba58020000 89b564ffffff } | |
| $sequence_8 | hex | { 8d0411 99 8bcb 2bc2 89bd70ffffff d1f8 89bd50ffffff } | |
| $sequence_9 | hex | { 85f6 7851 8b07 b901000000 2b48fc 8b40f8 } |
Condition
7 of them and filesize < 4315136In plain words (Heuristic)
- The file must be smaller than 4315136 (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: 957bfbd2-cd15-53c8-906d-2ba3b32154e0
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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