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YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_SUSP_LNX_Sindoor_Desktopfile_Aug25

Detects ELF obfuscation technique used by Sindoor dropper related to APT 36

Suspicious / huntingSignature Base (Florian Roth / Nextron)Detection Rule License 1.1Compiles with YARA-X
Author
Pezier Pierre-Henri
Date
2025-08-29
Modified
2026-05-15
Score / Quality
70 / 85

What this rule detects

Detects ELF obfuscation technique used by Sindoor dropper related to APT 36

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

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
susp-lnx-sindoor-desktopfile-aug25.yarDetection Rule License 1.1
rule SIGNATURE_BASE_SUSP_LNX_Sindoor_Desktopfile_Aug25 : FILE
{
	meta:
		description = "Detects ELF obfuscation technique used by Sindoor dropper related to APT 36"
		author = "Pezier Pierre-Henri"
		id = "16719116-0cb2-5c70-a86f-f65f9ea32153"
		date = "2025-08-29"
		modified = "2026-05-15"
		reference = "Internal Research"
		source_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/apt_apt36_operation_sindoor.yar#L19-L36"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		hash = "9943bdf1b2a37434054b14a1a56a8e67aaa6a8b733ca785017d3ed8c1173ac59"
		logic_hash = "1549aac3132c5f3e73d984c3404a5530507e967df4ab6d5ccd408abc874a5306"
		score = 70
		quality = 85
		tags = "FILE"

	strings:
		$hdr = "[Desktop Entry]"
		$s1 = "printf '\\\\x7FELF' | dd of"
		$s2 = "Future_Note_Warfare_OpSindoor.pdf"

	condition:
		filesize < 100KB and $hdr and any of ( $s* )
}

Strings (3 patterns)

IdentifierTypeValueModifiers
$hdrtext"[Desktop Entry]"
$s1text"printf '\\\\x7FELF' | dd of"
$s2text"Future_Note_Warfare_OpSindoor.pdf"

Condition

filesize < 100KB and $hdr and any of ( $s* )

In plain words (Heuristic)

  • The file must be smaller than 100KB (a cheap guard that skips large files).
  • At least one pattern in ( $s* ) must match.
  • Pattern $hdr must be present.

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Drop a file here or click to chooseScanned locally with YARA-X. Files up to 200 MB.

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Sample hashes

Hashes of samples the author lists in the rule's meta (look them up in your threat-intelligence platform).

  • 9943bdf1b2a37434054b14a1a56a8e67aaa6a8b733ca785017d3ed8c1173ac59

Licence & attribution

Author: Pezier Pierre-Henri

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: 16719116-0cb2-5c70-a86f-f65f9ea32153

Tags:FILE

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