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YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_PUA_WIN_XMRIG_Cryptocoin_Miner_Dec20

Detects XMRIG crypto coin miners

Potentially unwantedSignature Base (Florian Roth / Nextron)Detection Rule License 1.1Compiles with YARA-X
Author
Florian Roth (Nextron Systems)
Date
2020-12-31
Modified
2023-12-05
Score / Quality
75 / 85

What this rule detects

Detects XMRIG crypto coin miners

Targets: Windows PE.

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

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
pua-win-xmrig-cryptocoin-miner-dec20.yarDetection Rule License 1.1
rule SIGNATURE_BASE_PUA_WIN_XMRIG_Cryptocoin_Miner_Dec20 : FILE
{
	meta:
		description = "Detects XMRIG crypto coin miners"
		author = "Florian Roth (Nextron Systems)"
		id = "4dfb04e9-fbba-5a6f-ad20-d805025d2d74"
		date = "2020-12-31"
		modified = "2023-12-05"
		reference = "https://www.intezer.com/blog/research/new-golang-worm-drops-xmrig-miner-on-servers/"
		source_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/crime_crypto_miner.yar#L19-L33"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		hash = "b6154d25b3aa3098f2cee790f5de5a727fc3549865a7aa2196579fe39a86de09"
		logic_hash = "c39aee669a98bcc9d07821aef248096e45a6c54ab22b8b98c0a393b445f3934e"
		score = 75
		quality = 85
		tags = "FILE"

	strings:
		$x1 = "xmrig.exe" fullword wide
		$x2 = "xmrig.com" fullword wide
		$x3 = "* for x86, CRYPTOGAMS" fullword ascii

	condition:
		uint16( 0 ) == 0x5a4d and filesize < 6000KB and 2 of them or all of them
}

Strings (3 patterns)

IdentifierTypeValueModifiers
$x1text"xmrig.exe"fullword wide
$x2text"xmrig.com"fullword wide
$x3text"* for x86, CRYPTOGAMS"fullword ascii

Condition

uint16( 0 ) == 0x5a4d and filesize < 6000KB and 2 of them or all of them

In plain words (Heuristic)

  • The file must start with “MZ” — a Windows executable (PE).
  • The file must be smaller than 6000KB (a cheap guard that skips large files).
  • All patterns in the rule must match.
  • At least 2 patterns in the rule must match.

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References

Sample hashes

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

  • b6154d25b3aa3098f2cee790f5de5a727fc3549865a7aa2196579fe39a86de09

Licence & attribution

Author: Florian Roth (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: 4dfb04e9-fbba-5a6f-ad20-d805025d2d74

Tags:FILE

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