{
  "name": "Certified OysterLoader: Tracking Rhysida ransomware gang activity via code-signing certificates",
  "slug": "certified-oysterloader-tracking-rhysida-ransomware-gang-activity-via-code-signing-certificates",
  "description": "The Rhysida ransomware gang, formerly known as Vice Society, is conducting an ongoing malicious ad campaign to deliver OysterLoader malware. This initial access tool establishes a foothold on devices for dropping a persistent backdoor. The campaign uses Bing search engine advertisements to direct users to malicious landing pages impersonating popular software downloads. To evade detection, the malware is packed and uses code-signing certificates, including Microsoft Trusted Signing. The gang's activity has expanded, with over 40 certificates tracked in 2025 compared to 7 in 2024. They're also using Latrodectus malware for initial access. The campaign's scale and use of legitimate services highlight the gang's sophistication and resource investment.",
  "published": "2025-11-03T09:15:39+00:00",
  "created_at": "2025-11-03T09:15:39+00:00",
  "modified_at": "2025-11-03T11:13:25+00:00",
  "created_at_opencti": "2025-11-03T09:15:39+00:00",
  "author": "",
  "confidence": null,
  "report_types": [],
  "labels": [],
  "tags": [
    "2025-11-03",
    "code-signing",
    "initial access",
    "latrodectus",
    "malvertising",
    "microsoft trusted signing",
    "oysterloader",
    "ransomware"
  ],
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    ],
    "malware": [
      {
        "id": "legacy:malware:10cac5e3a0dc2bf0",
        "name": "OysterLoader",
        "slug": "oysterloader"
      },
      {
        "id": "legacy:malware:6d75d6c71d1f38b5",
        "name": "Latrodectus",
        "slug": "latrodectus"
      }
    ],
    "intrusion_sets": [
      {
        "id": "6b269fa1-6ab6-4e2f-891a-38ae7fbcab92",
        "name": "Rhysida",
        "slug": "rhysida"
      }
    ],
    "attack_patterns": [
      {
        "id": "e1b18ecf-d74e-4fe6-9bd4-ca6a62e7d818",
        "name": "T1027.002"
      },
      {
        "id": "16e4fc82-7c0b-4d1a-b784-b804b4df26dc",
        "name": "T1204.001"
      },
      {
        "id": "196f2a64-c55b-47a6-8e38-beb76ba700b6",
        "name": "T1204.002"
      },
      {
        "id": "c3af9fd7-d307-4df4-9220-cc627938fb85",
        "name": "T1055"
      },
      {
        "id": "0156fcda-e385-4662-b388-086c3e16feec",
        "name": "T1140"
      },
      {
        "id": "0c836307-129e-4ff7-a532-180c633cacba",
        "name": "T1027"
      },
      {
        "id": "6c8f8a40-2746-4a37-86bd-81e82afa6e62",
        "name": "T1190"
      },
      {
        "id": "b9eab970-53dd-4977-9a26-c4fe566e422d",
        "name": "T1133"
      },
      {
        "id": "9f11a241-9abc-4c57-95dd-33955ab08826",
        "name": "T1078"
      },
      {
        "id": "9b6064e6-a05b-4e95-baf5-34d180bc9221",
        "name": "T1059"
      }
    ]
  },
  "external_refs": [
    "https://expel.com/blog/certified-oysterloader-tracking-rhysida-ransomware-gang-activity-via-code-signing-certificates/",
    "https://otx.alienvault.com/pulse/690880cb9724e9d7053104ca"
  ]
}