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MALPEDIA_Win_Rctrl_Auto

autogenerated rule brought to you by yara-signator

MalwareRctrlMalpedia 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: 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:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "957bfbd2-cd15-53c8-906d-2ba3b32154e0"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.rctrl"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.rctrl_auto.yar#L1-L128"
		license_url = "N/A"
		logic_hash = "41d67828bd5cd0d3a848db8c668a883d749583eba8e7c1da637587685e42750e"
		score = 75
		quality = 75
		tags = "FILE"
		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"

	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)

IdentifierTypeValueModifiers
$sequence_0hex{ ff500c 83c010 8906 8b5508 c745fc00000000 85d2 743a }
$sequence_1hex{ 56 57 ff7518 8b7dfc ff7514 ff7510 }
$sequence_2hex{ 59 59 5f ebc7 55 8bec }
$sequence_3hex{ eb04 ddd8 33c0 5e 5d c20800 6a08 }
$sequence_4hex{ 6a00 f3a5 50 e8???????? 8b8540f9ffff 8945b8 8d8530f5ffff }
$sequence_5hex{ 5d c22000 33c0 c7410c01000000 894104 8901 894108 }
$sequence_6hex{ 8b4508 33c9 668908 56 ff15???????? }
$sequence_7hex{ b920030000 c78540ffffff681c5800 be90010000 899d44ffffff ba58020000 89b564ffffff }
$sequence_8hex{ 8d0411 99 8bcb 2bc2 89bd70ffffff d1f8 89bd50ffffff }
$sequence_9hex{ 85f6 7851 8b07 b901000000 2b48fc 8b40f8 }

Condition

7 of them and filesize < 4315136

In 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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References

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)

Original rule

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

version1
toolyara-signator v0.6.0
signator_configcallsandjumps;datarefs;binvalue
malpedia_rule_date20260422
malpedia_hasha182e35da64e6d71cb55f125c4d4225196523f14
malpedia_version20260504
malpedia_licenseCC BY-SA 4.0
malpedia_sharingTLP:WHITE

Tags:FILE