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YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_APT_Crywiper_Dec22

Detects CryWiper malware samples

APT / threat actorSignature Base (Florian Roth / Nextron)Detection Rule License 1.1Compiles with YARA-X
Author
Florian Roth (Nextron Systems)
Date
2022-12-05
Modified
2023-12-05
Score / Quality
75 / 85

What this rule detects

Detects CryWiper malware samples

It defines 4 patterns (4 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
apt-crywiper-dec22.yarDetection Rule License 1.1
rule SIGNATURE_BASE_APT_Crywiper_Dec22
{
	meta:
		description = "Detects CryWiper malware samples"
		author = "Florian Roth (Nextron Systems)"
		id = "d56ccf4e-30ba-5308-ad68-ffc2ae5a1718"
		date = "2022-12-05"
		modified = "2023-12-05"
		reference = "https://securelist-ru.translate.goog/novyj-troyanec-crywiper/106114/?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en"
		source_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/apt_ru_crywiper.yar#L2-L19"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		logic_hash = "7c22e02ed996cd820ed87a0c5d50e3264629cdd887aad4ea466cadeccaee2b2f"
		score = 75
		quality = 85
		tags = ""

	strings:
		$x1 = "Software\\Sysinternals\\BrowserUpdate"
		$sx1 = "taskkill.exe /f /im MSExchange*"
		$s1 = "SYSTEM\\CurrentControlSet\\Control\\Terminal Server" ascii
		$s2 = "fDenyTSConnections" ascii

	condition:
		1 of ( $x* ) or all of ( $s* )
}

Strings (4 patterns)

IdentifierTypeValueModifiers
$x1text"Software\\Sysinternals\\BrowserUpdate"
$sx1text"taskkill.exe /f /im MSExchange*"
$s1text"SYSTEM\\CurrentControlSet\\Control\\Terminal Server"ascii
$s2text"fDenyTSConnections"ascii

Condition

1 of ( $x* ) or all of ( $s* )

In plain words (Heuristic)

  • All patterns in ( $s* ) must match.
  • At least 1 patterns in ( $x* ) must match.

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References

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: d56ccf4e-30ba-5308-ad68-ffc2ae5a1718

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