MuddyWater hackers use Chaos ransomware as a decoy in attacks
The MuddyWater Iranian hackers disguised their operations as a Chaos ransomware attack, relying on Microsoft Teams social engineering to gain access and establish persistence.
Grace Ops
triage-ready iocs + detections
fresh
1
IOC Workbench
typed indicators with fast copy and export actions
2 total
uhttps://www.bleepingcomputer.com/news/security/muddywater-hackers-use-chaos-ransomware-as-a-decoy-in-attacks/
dwww.bleepingcomputer.com
2 indicators staged for handoff.
2
Rule Studio
starter detections generated from this IOC set
2 formats
!Draft output: validate and tune before production rollout.
sigmadraft
title: AHackaday IOC starter detection
id: ahackaday-2026-05-06-muddywater-hackers-use-chaos-ransomware-as-a-decoy-in-attacks-beed4573
description: IOC starter rule for MuddyWater hackers use Chaos ransomware as a decoy in attacks
status: experimental
author: ahackaday
logsource:
product: network
detection:
selection_iocs:
- "https://www.bleepingcomputer.com/news/security/muddywater-hackers-use-chaos-ransomware-as-a-decoy-in-attacks/"
- "www.bleepingcomputer.com"
condition: selection_iocs
falsepositives:
- unknown
level: medium
coverage
yaradraft
rule ahackaday_2026_05_06_muddywater_hackers_use_chaos_ransomware_as_a_decoy_in_attacks_beed4573
{
meta:
description = "IOC starter for MuddyWater hackers use Chaos ransomware as a decoy in attacks"
author = "ahackaday"
strings:
$ioc1 = "https://www.bleepingcomputer.com/news/security/muddywater-hackers-use-chaos-ransomware-as-a-decoy-in-attacks/" nocase
$ioc2 = "www.bleepingcomputer.com" nocase
condition:
any of them
}
coverage
3
Response Tracks
fast operational tracks from this incident snapshot
4 tracks
source-backed 1 refs
audit trail / provenance1
Provenance
Claims tie surfaced fields back to sources, models, or heuristics.
- severity.upliftheuristicn/aRansomware campaign indicators detected — floor raised to at least high.
What changed
Append-only revisions when ingest or analysts evolve the record.
No revision rows stored yet.
Sources
Curated May 06, 2026 by the ahackaday team./Sources verified./Brief grounded in 1 source.
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