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MALPEDIA_Win_Orpcbackdoor_Auto

autogenerated rule brought to you by yara-signator

MalwareOrpcbackdoorMalpedia 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: Orpcbackdoor.

It defines 10 patterns (0 text, 10 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

win-orpcbackdoor-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Orpcbackdoor_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "b1469adc-1aed-5d92-a8e2-21f306040afe"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.orpcbackdoor"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.orpcbackdoor_auto.yar#L1-L131"
		license_url = "N/A"
		logic_hash = "7cbc299a7e1f14b797d0ab31cc299afb88e54a5cff70962d9fc7cbe7fafc04f6"
		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 = { e8???????? 8bc6 c1e002 50 8b85acf8ffff 0fb70485ac820310 }
		$sequence_1 = { 6a00 8b4dfc e8???????? 8b45fc c9 }
		$sequence_2 = { 0f94c0 c3 c705????????80700000 33c0 c705????????01000000 c705????????f0f1ffff c705????????a0450410 }
		$sequence_3 = { e9???????? 8b45e4 2b450c 8b55e8 1b5510 c9 c20c00 }
		$sequence_4 = { 59 8945d4 8b45d4 8945e0 8b450c 8945d8 837d0c00 }
		$sequence_5 = { 32c0 ebf7 8bff 55 8bec 0fb7450e 2500800000 }
		$sequence_6 = { ff75f4 ff75d4 8d4d0c e8???????? 8d45f8 50 ff75f4 }
		$sequence_7 = { ff7518 ff7510 ff750c ff7508 ff75e0 e8???????? 83c418 }
		$sequence_8 = { 894244 8b4df0 e8???????? ff75f8 ff75f4 8b45f0 ff7044 }
		$sequence_9 = { cc e9???????? 55 8bec 8b4d08 b8???????? 3908 }

	condition:
		7 of them and filesize < 918528
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ e8???????? 8bc6 c1e002 50 8b85acf8ffff 0fb70485ac820310 }
$sequence_1hex{ 6a00 8b4dfc e8???????? 8b45fc c9 }
$sequence_2hex{ 0f94c0 c3 c705????????80700000 33c0 c705????????01000000 c705????????f0f1ffff c705????????a0450410 }
$sequence_3hex{ e9???????? 8b45e4 2b450c 8b55e8 1b5510 c9 c20c00 }
$sequence_4hex{ 59 8945d4 8b45d4 8945e0 8b450c 8945d8 837d0c00 }
$sequence_5hex{ 32c0 ebf7 8bff 55 8bec 0fb7450e 2500800000 }
$sequence_6hex{ ff75f4 ff75d4 8d4d0c e8???????? 8d45f8 50 ff75f4 }
$sequence_7hex{ ff7518 ff7510 ff750c ff7508 ff75e0 e8???????? 83c418 }
$sequence_8hex{ 894244 8b4df0 e8???????? ff75f8 ff75f4 8b45f0 ff7044 }
$sequence_9hex{ cc e9???????? 55 8bec 8b4d08 b8???????? 3908 }

Condition

7 of them and filesize < 918528

In plain words (Heuristic)

  • The file must be smaller than 918528 (a cheap guard that skips large files).
  • At least 7 patterns in the rule must match.

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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: b1469adc-1aed-5d92-a8e2-21f306040afe

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