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YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_M_Hunting_Backdoor_ZIPLINE_1

This rule detects unique strings in ZIPLINE, a passive ELF backdoor that waits for incoming TCP connections to receive commands from the threat actor.

Suspicious / huntingSignature Base (Florian Roth / Nextron)Detection Rule License 1.1Compiles with YARA-X
Author
Mandiant
Date
2024-01-11
Modified
2024-04-24
Score / Quality
75 / 85

What this rule detects

This rule detects unique strings in ZIPLINE, a passive ELF backdoor that waits for incoming TCP connections to receive commands from the threat actor.

Targets: Linux ELF.

It defines 6 patterns (6 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
m-hunting-backdoor-zipline-1.yarDetection Rule License 1.1
rule SIGNATURE_BASE_M_Hunting_Backdoor_ZIPLINE_1 : FILE
{
	meta:
		description = "This rule detects unique strings in ZIPLINE, a passive ELF backdoor that waits for incoming TCP connections to receive commands from the threat actor."
		author = "Mandiant"
		id = "753884d6-d4c1-5e94-9d2c-f6ebb7bfaf85"
		date = "2024-01-11"
		modified = "2024-04-24"
		reference = "https://www.mandiant.com/resources/blog/suspected-apt-targets-ivanti-zero-day"
		source_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/apt_report_ivanti_mandiant_jan24.yar#L18-L38"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		logic_hash = "41857ba465dd1f2e1aa8c1eed36b73606385eeedf233fd480bb8a4ef15499174"
		score = 75
		quality = 85
		tags = "FILE"

	strings:
		$s1 = "SSH-2.0-OpenSSH_0.3xx" ascii
		$s2 = "$(exec $installer $@)" ascii
		$t1 = "./installer/do-install" ascii
		$t2 = "./installer/bom_files/" ascii
		$t3 = "/tmp/data/root/etc/ld.so.preload" ascii
		$t4 = "/tmp/data/root/home/etc/manifest/exclusion_list" ascii

	condition:
		uint32( 0 ) == 0x464c457f and filesize < 5MB and ( ( 1 of ( $s* ) ) or ( 3 of ( $t* ) ) )
}

Strings (6 patterns)

IdentifierTypeValueModifiers
$s1text"SSH-2.0-OpenSSH_0.3xx"ascii
$s2text"$(exec $installer $@)"ascii
$t1text"./installer/do-install"ascii
$t2text"./installer/bom_files/"ascii
$t3text"/tmp/data/root/etc/ld.so.preload"ascii
$t4text"/tmp/data/root/home/etc/manifest/exclusion_list"ascii

Condition

uint32( 0 ) == 0x464c457f and filesize < 5MB and ( ( 1 of ( $s* ) ) or ( 3 of ( $t* ) ) )

In plain words (Heuristic)

  • The file must start with the ELF header — a Linux/Unix executable.
  • The file must be smaller than 5MB (a cheap guard that skips large files).
  • At least 1 patterns in ( $s* ) must match.
  • At least 3 patterns in ( $t* ) must match.

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References

Licence & attribution

Author: Mandiant

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: 753884d6-d4c1-5e94-9d2c-f6ebb7bfaf85

Tags:FILE

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