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VOLEXITY_Apt_Malware_Any_Reloadext_Plugin

Detection for RELOADEXT, a Google Chrome extension malware.

APT / threat actorVolexity threat-intelBSD 2-Clause LicenseCompiles with YARA-X
Author
threatintel@volexity.com
Date
2024-02-23
Modified
2024-08-02
Score / Quality
75 / 80

What this rule detects

Detection for RELOADEXT, a Google Chrome extension malware.

It defines 5 patterns (5 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

apt-malware-any-reloadext-plugin.yarBSD 2-Clause License
rule VOLEXITY_Apt_Malware_Any_Reloadext_Plugin : STORMBAMBOO FILE MEMORY
{
	meta:
		description = "Detection for RELOADEXT, a Google Chrome extension malware."
		author = "threatintel@volexity.com"
		id = "6c6c8bee-2a13-5645-89ef-779f00264fd9"
		date = "2024-02-23"
		modified = "2024-08-02"
		reference = "TIB-20240227"
		source_url = "https://github.com/volexity/threat-intel/blob/3a9d0b52459877ee866a9a0ba06e60059b778c77/2024/2024-08-02 StormBamboo/rules.yar#L4-L36"
		license_url = "https://github.com/volexity/threat-intel/blob/3a9d0b52459877ee866a9a0ba06e60059b778c77/LICENSE.txt"
		hash = "9d0928b3cc21ee5e1f2868f692421165f46b5014a901636c2a2b32a4c500f761"
		logic_hash = "2b11f8fc5b6260ebf00bde83585cd7469709a4979ca579cdf065724bc15052fc"
		score = 75
		quality = 80
		tags = "STORMBAMBOO, FILE, MEMORY"
		os = "all"
		os_arch = "all"
		scan_context = "file,memory"
		severity = "critical"
		license = "See license at https://github.com/volexity/threat-intel/blob/main/LICENSE.txt"
		rule_id = 10282
		version = 4

	strings:
		$man1 = "Reload page with Internet Explorer compatible mode."
		$man2 = "\"http://*/*\""
		$code1 = ";chrome["
		$code2 = "XMLHttpRequest(),_"
		$code3 = "0x400*0x400"

	condition:
		all of ( $man* ) or ( #code1 > 8 and #code2 >= 2 and #code3 >= 2 )
}

Strings (5 patterns)

IdentifierTypeValueModifiers
$man1text"Reload page with Internet Explorer compatible mode."
$man2text"\"http://*/*\""
$code1text";chrome["
$code2text"XMLHttpRequest(),_"
$code3text"0x400*0x400"

Condition

all of ( $man* ) or ( #code1 > 8 and #code2 >= 2 and #code3 >= 2 )

In plain words (Heuristic)

  • All patterns in ( $man* ) must match.
  • Pattern $code1 must occur > 8 times.
  • Pattern $code2 must occur >= 2 times.
  • Pattern $code3 must occur >= 2 times.

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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).

  • 9d0928b3cc21ee5e1f2868f692421165f46b5014a901636c2a2b32a4c500f761

Licence & attribution

Author: threatintel@volexity.com

Source repository: Volexity threat-intel @ 3a9d0b5245

Licence: BSD 2-Clause License (stated in the rule's own meta)

“See license at https://github.com/volexity/threat-intel/blob/main/LICENSE.txt”

Copyright notice: Copyright 2022 by Volexity, Inc.

Original rule

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

Rule id: 6c6c8bee-2a13-5645-89ef-779f00264fd9

Metadata

osall
os_archall
scan_contextfile,memory
severitycritical
rule_id10282
version4

Tags:STORMBAMBOOFILEMEMORY