Our checkout started throwing intermittent 429s from the gateway during a flash sale. Client retry logic used fixed exponential backoff: 1s, 2s, 4s, 8s, capped at 30s. Looked reasonable on paper. What we missed: the gateway's rate limiter tracks consecutive throttled requests per merchant key, and every response carried a Retry-After header we... Weiterlesen
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Ignoring Retry-After on 429s turned a 2-second blip into a 4-minute lockout
Our checkout started throwing intermittent 429s from the gateway during a flash sale. Client retry logic used fixed exponential backoff: 1s, 2s, 4s, 8s, capped at 30s. Looked reasonable on paper. What we missed: the gateway's rate…
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Syntax validiert (0 Fehler)
title: Detect Exploitation - Ignoring Retry-After on 429s turned a 2-second blip into a 4-minute lockout
id: 3355c073-a3cb-45c0-a260-b31d7ddd9237
status: experimental
description: Automatisch generierte SIEM-Erkennungsregel basierend auf CTI Intelligence
references:
- https://tsecurity.de/
author: iShareStuff CTI Automated Detection Engine
date: 2026-09-25
logsource:
category: network_connection
product: any
detection:
selection:
CommandLine|contains:
- 'exploit'
condition: selection
falsepositives:
- Legitime administrative Zugriffe oder Penetrationstests
level: high
tags:
- attack.initial_accessSyntax validiert (0 Fehler)
rule CTI_Threat_Indicator {
meta:
author = "iShareStuff CTI Automated Detection Engine"
date = "2026-09-25"
description = "YARA Signature for "
strings:
$str = "Ignoring Retry-After on 429s t" ascii wide
condition:
any of them
}Syntax validiert (0 Fehler)
index=security sourcetype IN ("cisco:asa", "pan:traffic", "zeek_conn", "suricata", "WinEventLog:Security")
("Ignoring Retry-After on 429s turned a 2-")
| stats count earliest(_time) as first_seen latest(_time) as last_seen by src_ip, dest_ip, dest_host, signature
| eval first_seen=strftime(first_seen, "%Y-%m-%d %H:%M:%S"), last_seen=strftime(last_seen, "%Y-%m-%d %H:%M:%S")
| sort - countSyntax validiert (0 Fehler)
message: "*Ignoring Retry-After on 429s turned a 2-*"Syntax validiert (0 Fehler)
CommonSecurityLog
| where Message has "Ignoring Retry-After on 429s turned a 2-"
| summarize EventCount = count(), FirstSeen = min(TimeGenerated), LastSeen = max(TimeGenerated) by SourceIP, DestinationIP, DestinationPort, Activity
| extend DetectionRule = "iShareStuff-CTI-Compiled"
| sort by EventCount desc🎯
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Reconnaissance
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Resource Development
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Initial Access
Execution
Persistence
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Privilege Escalation
Defense Evasion
Credential Access
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Discovery
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Lateral Movement
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Collection
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Command and Control
Exfiltration
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Impact
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Kognitive Analyse für identifizierte Bedrohung: Erhöhte Bedrohungslage im Bereich Ignoring Retry-After on 429s turned a 2-.... Basierend auf 368k Vektor-Korrelationen werden sofortige Isolationsmaßnahmen für betroffene Endpunkte empfohlen.
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