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YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_SUSP_Scheduledtasks_Nimbus_Manticore_Persistence_May26

Detects scheduled task used for persistence by Nimbus Manticore (UNC1549). The task is used to persistenly load a custom implant that features data exfiltration and remote control capabilities.

Suspicious / huntingSignature Base (Florian Roth / Nextron)Detection Rule License 1.1Compiles with YARA-X
Author
Jonathan Peters (Nextron Systems)
Date
2026-05-27
Modified
2026-06-01
Score / Quality
75 / 85

What this rule detects

Detects scheduled task used for persistence by Nimbus Manticore (UNC1549). The task is used to persistenly load a custom implant that features data exfiltration and remote control capabilities.

It defines 3 patterns (3 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
susp-scheduledtasks-nimbus-manticore-persistence-may26.yarDetection Rule License 1.1
rule SIGNATURE_BASE_SUSP_Scheduledtasks_Nimbus_Manticore_Persistence_May26 : FILE
{
	meta:
		description = "Detects scheduled task used for persistence by Nimbus Manticore (UNC1549). The task is used to persistenly load a custom implant that features data exfiltration and remote control capabilities."
		author = "Jonathan Peters (Nextron Systems)"
		id = "f8e8e8e1-1c31-5471-b7c0-ec260c8ef462"
		date = "2026-05-27"
		modified = "2026-06-01"
		reference = "https://www.nextron-systems.com/2026/06/01/detecting-nimbus-manticore-and-their-sideloading-infection-chains/"
		source_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/apt_apt35_malware_may26.yar#L1-L16"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		logic_hash = "dc4c82625db0dd8db2098387f227ade773d31747b259b3ffc2c366c47d9b0d20"
		score = 75
		quality = 85
		tags = "FILE"

	strings:
		$a0 = "<Task version=" wide
		$a1 = "xmlns=\"http://schemas.microsoft.com/windows/" wide
		$x1 = "<Arguments>doit" wide

	condition:
		uint16( 0 ) == 0xfeff and all of them
}

Strings (3 patterns)

IdentifierTypeValueModifiers
$a0text"<Task version="wide
$a1text"xmlns=\"http://schemas.microsoft.com/windows/"wide
$x1text"<Arguments>doit"wide

Condition

uint16( 0 ) == 0xfeff and all of them

In plain words (Heuristic)

  • All patterns in the rule must match.

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References

Licence & attribution

Author: Jonathan Peters (Nextron Systems)

Source repository: Signature Base (Florian Roth / Nextron) @ 94a1c48d7a

Licence: Detection Rule License 1.1 (repository licence)

Original rule

Mirrored via YARA Forge 20260927, which prefixes rule names with the source and adds normalised meta fields.

Rule id: f8e8e8e1-1c31-5471-b7c0-ec260c8ef462

Tags:FILE

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