38/100 CVSS 6.5 🦠 MALWAREPublished: May 22, 2026

Tracking Iranian APT Screening Serpens’ 2026 Espionage Campaigns

Unit 42 details Screening Serpens' use of AppDomainManager hijacking and new RAT variants to target tech and defense sectors in recent campaigns. The post Tracking Iranian APT Screening Serpens’ 2026 Espionage Campaigns appeared first on Unit 42 .

6.5

CVSS Score

LOW

Threat Level

Priority /100

TBD

Exploited ITW

Monitor

CISA Status

Sources

🔵

HIGH-PRIORITY SECURITY ADVISORY — Priority Score: 38/100

CVSS 6.5 LOW. SENTINEL APEX recommends immediate patch evaluation. Intelligence from 1 confirmed source(s).

📋 Executive Summary

⚡ Analyst Assessment — SENTINEL APEX v4.0

CYBERDUDEBIVASH SENTINEL APEX has confirmed a LOW-tier threat intelligence signal for UNIT42-56e1f3c9f00a84de affecting unit42 Threat Intelligence. Composite threat score: 38/100. Intelligence corroborated across 1 source(s): unit42. CVSS base score: 6.5. Exploitation probability assessed as HIGH based on vulnerability characteristics.

Intelligence sources: unit42

⚠️ Business Impact Analysis

⚠️ unit42 Threat Intelligence users face material security risk requiring immediate remediation

🔗 Attack Chain Analysis

Step-by-step attack chain based on observed TTPs and vulnerability characteristics:

#	Phase	Attacker Action	MITRE
1	Reconnaissance	Attacker identifies exposed Threat Intelligence instances via Shodan, Censys, or targeted scanning	`TA0043`
2	Initial Access	Exploitation of UNIT42-56e1f3c9f00a84de in unit42 Threat Intelligence	`T1190`
3	Persistence	Backdoor, scheduled task, or new admin account created for persistent access	`T1053`
4	Command & Control	Attacker establishes persistent C2 channel using HTTPS or DNS tunneling	`T1071`
5	Impact / Objectives	Intellectual property theft, espionage, cryptomining, or preparation for future attack stage	`T1657`

⚠ Deep Dive Analysis

Active malware campaign infrastructure has been identified and confirmed. This campaign is using live distribution infrastructure currently serving payloads. The IOCs in this report should be blocked immediately across all security controls — firewall, proxy, EDR, and email gateway.

SENTINEL APEX URGENCY: ELEVATED. Score: 38/100 LOW. Patch before exploitation activity begins.

🎯 MITRE ATT&CK Mapping

Category	Mapping
Primary Tactic	Execution
Primary Technique	T1059 — Command & Scripting Interpreter
Sub-Technique	T1055 — Process Injection
Weakness (CWE)	See NVD entry
Intel Type	🦠 MALWARE
Source(s)	unit42

🔍 Detection Rules — Sigma (SIEM)

Deploy to Splunk, Elastic, Microsoft Sentinel, or QRadar. SOC Pro subscribers receive pre-compiled SIEM-native query packs updated with each pipeline run.

Sigma YAMLtitle: UNIT42-56e1f3c9f00a84de Exploitation Attempt — unit42 Threat Intelligence
id: ac788c0c1acc4ebb-3eca
status: experimental
description: Detects exploitation of UNIT42-56e1f3c9f00a84de in unit42 Threat Intelligence. Priority: LOW. Score: 38/100
author: CYBERDUDEBIVASH SENTINEL APEX v4.0 (bivash@cyberdudebivash.com)
date: 2026-05-22
references:
    - https://nvd.nist.gov/vuln/detail/UNIT42-56e1f3c9f00a84de
    - https://blog.cyberdudebivash.in/
tags:
    - attack.initial_access
    - attack.t1190
logsource:
    category: webserver
detection:
    keywords:
        - 'unit42-56e1f3c9f00a84de'
    condition: keywords
falsepositives:
    - Security scanners
level: medium

📡 Detection Rules — YARA (Endpoint)

Deploy to endpoint detection platforms. Enterprise subscribers receive tuned, FP-validated YARA rule packs.

YARArule UNIT42_56e1f3c9f00a84de_Exploitation {
    meta:
        description = "Detects artifacts related to UNIT42-56e1f3c9f00a84de exploitation in unit42 Threat Intelligence"
        author      = "CYBERDUDEBIVASH SENTINEL APEX v4.0"
        date        = "2026-05-22"
        severity    = "HIGH"
        cvss        = "6.5"
        priority    = "38/100"
        threat_level = "LOW"
        reference   = "https://nvd.nist.gov/vuln/detail/UNIT42-56e1f3c9f00a84de"
    strings:
        $id_str  = "UNIT42-56e1f3c9f00a84de" ascii nocase
        $product = "Threat_Intelligence" ascii nocase wide
    condition:
        any of them
}

🛡️ SOC Response Playbook

1IMMEDIATE (0-1hr): Identify all instances of Threat Intelligence in your environment via CMDB/asset inventory
2IMMEDIATE (0-1hr): Apply vendor patch — no maintenance window exception for LOW threats
3IMMEDIATE (1-2hr): If no patch available: implement WAF rules, ACLs, or network-level compensating controls
4SHORT-TERM (2-4hr): Deploy Sigma detection rule to SIEM — validate alert generation in test environment
5SHORT-TERM (4-8hr): Review logs for exploitation indicators (anomalous Threat Intelligence requests, error spikes)
6SHORT-TERM (8-24hr): Hunt for post-exploitation: new admin accounts, scheduled tasks, lateral movement
7MONITOR: Subscribe to unit42 security advisories for patch updates
8ONGOING: Track SENTINEL APEX intelligence feed for follow-on campaigns targeting Threat Intelligence

📎 Intelligence References

unit42.paloaltonetworks.com/tracking-iran-apt-screening-serpens/

SENTINEL INTEL BRIEF

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⚡ CYBERDUDEBIVASH SENTINEL APEX v4.0

Intelligence report generated by CYBERDUDEBIVASH SENTINEL APEX v4.0
Report ID: SENTINEL-UNIT42-56e1f3c9f00a84de-2026-05-22 | Priority: 38/100 LOW | Sources: 1
© 2026 CYBERDUDEBIVASH PRIVATE LIMITED
Republication requires written attribution to CYBERDUDEBIVASH SENTINEL APEX

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