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MALPEDIA_Win_Ncctrojan_Auto

autogenerated rule brought to you by yara-signator

MalwareNcctrojanMalpedia 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: Ncctrojan.

It defines 17 patterns (0 text, 17 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

win-ncctrojan-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Ncctrojan_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "397c1c48-b2d6-5322-ab7d-4abc0e59c73a"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.ncctrojan"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.ncctrojan_auto.yar#L1-L174"
		license_url = "N/A"
		logic_hash = "f4906b9455afc57b70a3cddd8bdf9cc62def116e0c480e8106b08790424df03c"
		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 = { e9???????? 83f801 750a 68???????? e9???????? }
		$sequence_1 = { 7536 8b85e8feffff 85c0 750a }
		$sequence_2 = { ff15???????? 8945f0 8d45ec 6a10 }
		$sequence_3 = { 6a00 50 e8???????? 83c420 56 6a00 }
		$sequence_4 = { 6800400000 50 e8???????? 83c40c 837c240c00 }
		$sequence_5 = { eb0c 68???????? eb05 68???????? 8d44247c 6800400000 50 }
		$sequence_6 = { 745c 8b3d???????? 8d75ac 8b15???????? }
		$sequence_7 = { 6a00 ff15???????? 8d85e8fdffff 50 8d85e8adffff 6800400000 }
		$sequence_8 = { 0f8552ffffff eb57 6800400000 8d85d496ffff 6a00 50 }
		$sequence_9 = { 50 e8???????? 8b4d08 e8???????? e9???????? 8b4d08 e8???????? }
		$sequence_10 = { 6a00 50 e8???????? 0fb745b8 50 0fb745b6 }
		$sequence_11 = { 8b542408 8d420c 8b8a2cf8ffff 33c8 e8???????? 8b4afc }
		$sequence_12 = { 8b542408 8d420c 8b8a0cfefeff 33c8 }
		$sequence_13 = { 85d2 7e10 8ac1 02c9 2480 }
		$sequence_14 = { 85db 0f84b8000000 6a14 59 }
		$sequence_15 = { 0fb745ac 50 8d45bc 68???????? }
		$sequence_16 = { 6a00 50 e8???????? 56 8d856cfeffff 68???????? }

	condition:
		7 of them and filesize < 1160192
}

Strings (17 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ e9???????? 83f801 750a 68???????? e9???????? }
$sequence_1hex{ 7536 8b85e8feffff 85c0 750a }
$sequence_2hex{ ff15???????? 8945f0 8d45ec 6a10 }
$sequence_3hex{ 6a00 50 e8???????? 83c420 56 6a00 }
$sequence_4hex{ 6800400000 50 e8???????? 83c40c 837c240c00 }
$sequence_5hex{ eb0c 68???????? eb05 68???????? 8d44247c 6800400000 50 }
$sequence_6hex{ 745c 8b3d???????? 8d75ac 8b15???????? }
$sequence_7hex{ 6a00 ff15???????? 8d85e8fdffff 50 8d85e8adffff 6800400000 }
$sequence_8hex{ 0f8552ffffff eb57 6800400000 8d85d496ffff 6a00 50 }
$sequence_9hex{ 50 e8???????? 8b4d08 e8???????? e9???????? 8b4d08 e8???????? }
$sequence_10hex{ 6a00 50 e8???????? 0fb745b8 50 0fb745b6 }
$sequence_11hex{ 8b542408 8d420c 8b8a2cf8ffff 33c8 e8???????? 8b4afc }
$sequence_12hex{ 8b542408 8d420c 8b8a0cfefeff 33c8 }
$sequence_13hex{ 85d2 7e10 8ac1 02c9 2480 }
$sequence_14hex{ 85db 0f84b8000000 6a14 59 }
$sequence_15hex{ 0fb745ac 50 8d45bc 68???????? }
$sequence_16hex{ 6a00 50 e8???????? 56 8d856cfeffff 68???????? }

Condition

7 of them and filesize < 1160192

In plain words (Heuristic)

  • The file must be smaller than 1160192 (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: 397c1c48-b2d6-5322-ab7d-4abc0e59c73a

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