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WITHSECURELABS_Fallspy

Detects FallSpy Android malware

MalwareWithSecure Labs IOCsBSD 2-Clause LicenseCompiles with YARA-X
Author
WithSecure
Date
2026-05-28
Score / Quality
75 / 75

What this rule detects

Detects FallSpy Android malware

It defines 10 patterns (10 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
fallspy.yarBSD 2-Clause License
rule WITHSECURELABS_Fallspy
{
	meta:
		description = "Detects FallSpy Android malware"
		author = "WithSecure"
		id = "8d0823be-3a64-5e2d-995c-0b2fccf77a98"
		date = "2026-05-28"
		modified = "2026-05-28"
		reference = "https://github.com/WithSecureLabs/iocs"
		source_url = "https://github.com/WithSecureLabs/iocs/blob/1a8384468dd292c6d2c5114c32e42dc0da1f5ae1/GREYVIBE/greyvibe.yara#L121-L139"
		license_url = "https://github.com/WithSecureLabs/iocs/blob/1a8384468dd292c6d2c5114c32e42dc0da1f5ae1/LICENSE"
		logic_hash = "29575182e5399930764cdc33d1a62d020618ad630a01d4f503a38a241069fe4d"
		score = 75
		quality = 75
		tags = ""

	strings:
		$a = "DataCollectorWork" fullword
		$b = "UpdateChecker" fullword
		$c = "/check_update?version="
		$e = "&call_logs=" fullword
		$f = "&sim_numbers=" fullword
		$g = "&wifi_ssid=" fullword
		$h = "Public IP: " fullword
		$i = "uploaded_hashes" fullword
		$n = "Android ID: " fullword
		$o = "Call Logs: " fullword

	condition:
		4 of them
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$atext"DataCollectorWork"fullword
$btext"UpdateChecker"fullword
$ctext"/check_update?version="
$etext"&call_logs="fullword
$ftext"&sim_numbers="fullword
$gtext"&wifi_ssid="fullword
$htext"Public IP: "fullword
$itext"uploaded_hashes"fullword
$ntext"Android ID: "fullword
$otext"Call Logs: "fullword

Condition

4 of them

In plain words (Heuristic)

  • At least 4 patterns in the rule must match.

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References

Licence & attribution

Author: WithSecure

Source repository: WithSecure Labs IOCs @ 1a8384468d

Licence: BSD 2-Clause License (repository licence)

Copyright notice: Copyright (c) 2022, WithSecure Oyj

Original rule

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

Rule id: 8d0823be-3a64-5e2d-995c-0b2fccf77a98

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