YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_MAL_ARM_LNX_Mirai_Mar13_2022

Detects new ARM Mirai variant

MalwareMiraiSignature Base (Florian Roth / Nextron)Detection Rule License 1.1Compiles with YARA-X (with warnings)

Author: Mehmet Ali Kerimoglu a.k.a. CYB3RMX
Date: 2022-03-16
Modified: 2023-12-05
Score / Quality: 75 / 85

What this rule detects

Detects new ARM Mirai variant

Associated malware family: Mirai.

It defines 12 patterns (12 text, 0 hex, 0 regex).

YARA-X says: warning[duplicate_pattern_value]: duplicate pattern value

Summary generated from the rule's metadata and condition.

Rule source

Download .yar

mal-arm-lnx-mirai-mar13-2022.yarDetection Rule License 1.1

rule SIGNATURE_BASE_MAL_ARM_LNX_Mirai_Mar13_2022 : FILE
{
	meta:
		description = "Detects new ARM Mirai variant"
		author = "Mehmet Ali Kerimoglu a.k.a. CYB3RMX"
		id = "54d8860e-fc45-5571-b68c-66590c67a705"
		date = "2022-03-16"
		modified = "2023-12-05"
		reference = "https://github.com/Neo23x0/signature-base"
		source_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/crime_mirai.yar#L159-L181"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		hash = "0283b72913b8a78b2a594b2d40ebc3c873e4823299833a1ff6854421378f5a68"
		logic_hash = "a44a6174a198a658c8a5e2da50192da20bae7f8ed4e4f212c9eebb29fa4b0dd0"
		score = 75
		quality = 85
		tags = "FILE"

	strings:
		$str1 = "/home/landley/aboriginal/aboriginal/build/temp-armv6l/gcc-core/gcc/config/arm/lib1funcs.asm"
		$str2 = "/home/landley/aboriginal/aboriginal/build/temp-armv6l/gcc-core/gcc/config/arm/lib1funcs.asm"
		$str3 = "/home/landley/aboriginal/aboriginal/build/temp-armv6l/gcc-core/gcc/config/arm"
		$str4 = "/home/landley/aboriginal/aboriginal/build/simple-cross-compiler-armv6l/bin/../cc/include"
		$attck1 = "attack.c"
		$attck2 = "attacks.c"
		$attck3 = "anti_gdb_entry"
		$attck4 = "resolve_cnc_addr"
		$attck5 = "attack_gre_eth"
		$attck6 = "attack_udp_generic"
		$attck7 = "attack_get_opt_ip"
		$attck8 = "attack_icmpecho"

	condition:
		uint16( 0 ) == 0x457f and ( 3 of ( $str* ) or 4 of ( $attck* ) )
}

Strings (12 patterns)

Identifier	Type	Value
$str1	text	"/home/landley/aboriginal/aboriginal/build/temp-armv6l/gcc-core/gcc/config/arm/lib1funcs.asm"
$str2	text	"/home/landley/aboriginal/aboriginal/build/temp-armv6l/gcc-core/gcc/config/arm/lib1funcs.asm"
$str3	text	"/home/landley/aboriginal/aboriginal/build/temp-armv6l/gcc-core/gcc/config/arm"
$str4	text	"/home/landley/aboriginal/aboriginal/build/simple-cross-compiler-armv6l/bin/../cc/include"
$attck1	text	"attack.c"
$attck2	text	"attacks.c"
$attck3	text	"anti_gdb_entry"
$attck4	text	"resolve_cnc_addr"
$attck5	text	"attack_gre_eth"
$attck6	text	"attack_udp_generic"
$attck7	text	"attack_get_opt_ip"
$attck8	text	"attack_icmpecho"

Condition

uint16( 0 ) == 0x457f and ( 3 of ( $str* ) or 4 of ( $attck* ) )

In plain words (Heuristic)

At least 3 patterns in ( $str* ) must match.
At least 4 patterns in ( $attck* ) must match.

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References

https://github.com/Neo23x0/signature-base

Sample hashes

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

0283b72913b8a78b2a594b2d40ebc3c873e4823299833a1ff6854421378f5a68

Licence & attribution

Author: Mehmet Ali Kerimoglu a.k.a. CYB3RMX

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: 54d8860e-fc45-5571-b68c-66590c67a705

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