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YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_MAL_WAR_Ivanti_EPMM_Mobileiron_Logclear_JAVA_Aug23

Detects LogClear.class found in the Ivanti EPMM / MobileIron Core compromises exploiting CVE-2023-35078

MalwareSignature Base (Florian Roth / Nextron)Detection Rule License 1.1Compiles with YARA-X
Author
Florian Roth
Date
2023-08-01
Modified
2023-12-05
Score / Quality
80 / 85

What this rule detects

Detects LogClear.class found in the Ivanti EPMM / MobileIron Core compromises exploiting CVE-2023-35078

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

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
mal-war-ivanti-epmm-mobileiron-logclear-java-aug23.yarDetection Rule License 1.1
rule SIGNATURE_BASE_MAL_WAR_Ivanti_EPMM_Mobileiron_Logclear_JAVA_Aug23 : CVE_2023_35078 FILE
{
	meta:
		description = "Detects LogClear.class found in the Ivanti EPMM / MobileIron Core compromises exploiting CVE-2023-35078"
		author = "Florian Roth"
		id = "e1ef3bf3-0107-5ba6-a49f-71e079851a4f"
		date = "2023-08-01"
		modified = "2023-12-05"
		reference = "https://www.cisa.gov/news-events/cybersecurity-advisories/aa23-213a"
		source_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/expl_ivanti_epmm_mobileiron_cve_2023_35078.yar#L34-L53"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		hash = "deb381c25d7a511b9eb936129eeba2c0341cff7f4bd2168b05e40ab2ee89225e"
		logic_hash = "c42c2eca784d7089aab56addca11bad658a4a6c34a81ae823bd0c3dad41a1c99"
		score = 80
		quality = 85
		tags = "CVE-2023-35078, FILE"

	strings:
		$s1 = "logsPaths.txt" ascii fullword
		$s2 = "log file: %s, not read" ascii fullword
		$s3 = "/tmp/.time.tmp" ascii fullword
		$s4 = "readKeywords" ascii fullword
		$s5 = "\"----------------  ----------------" ascii fullword

	condition:
		uint16( 0 ) == 0xfeca and filesize < 20KB and 4 of them or all of them
}

Strings (5 patterns)

IdentifierTypeValueModifiers
$s1text"logsPaths.txt"ascii fullword
$s2text"log file: %s, not read"ascii fullword
$s3text"/tmp/.time.tmp"ascii fullword
$s4text"readKeywords"ascii fullword
$s5text"\"---------------- ----------------"ascii fullword

Condition

uint16( 0 ) == 0xfeca and filesize < 20KB and 4 of them or all of them

In plain words (Heuristic)

  • The file must be smaller than 20KB (a cheap guard that skips large files).
  • All patterns in the rule must match.
  • At least 4 patterns in the rule must match.

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References

Sample hashes

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

  • deb381c25d7a511b9eb936129eeba2c0341cff7f4bd2168b05e40ab2ee89225e

Licence & attribution

Author: Florian Roth

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: e1ef3bf3-0107-5ba6-a49f-71e079851a4f

Tags:CVE_2023_35078FILE

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