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The Kelihos botnet has a long history of delivering pharma spam and stock market manipulation spam (pump-n-dump), but now it was spamming the WildFire ransomware. ( See: http://garwarner.blogspot.com/2016/07/kelihos-botnet-delivering-dutch.html ) I was under the impression that it was one of the occasional gimmicks observed with Kelihos where they try something a single time and then move on. I assumed that some script kiddies were testing new ransomware techniques. Unfortunately, I was wrong and Kelihos hit back with CryptFIle2 encryption ransomware." }, { "type": "observed-data", "spec_version": "2.1", "id": "observed-data--5846b291-723c-4f42-beec-31ad950d210f", "created_by_ref": "identity--55f6ea5e-2c60-40e5-964f-47a8950d210f", "created": "2016-12-06T12:44:01.000Z", "modified": "2016-12-06T12:44:01.000Z", "first_observed": "2016-12-06T12:44:01Z", "last_observed": "2016-12-06T12:44:01Z", "number_observed": 1, "object_refs": [ "email-message--5846b291-723c-4f42-beec-31ad950d210f" ], "labels": [ "misp:type=\"email-subject\"", "misp:category=\"Payload delivery\"" ] }, { "type": "email-message", "spec_version": "2.1", "id": "email-message--5846b291-723c-4f42-beec-31ad950d210f", "is_multipart": false, "subject": "Bonus from AmericanAirlines" }, { "type": "observed-data", "spec_version": "2.1", "id": "observed-data--5846b291-1d70-4e89-aa04-31ad950d210f", "created_by_ref": "identity--55f6ea5e-2c60-40e5-964f-47a8950d210f", "created": 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