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NOTE: The sending email addresses might be spoofed.
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See attached docs for full information.ġ11 Hunter Street East, Peterborough, ON K9H 1G7 We detect unauthorized Login Attempts to your ID #295030013990 from other IP Address. Subject: Account #295030013990 Temporarily Locked This sample of Dalexis did 124 HTTP POST requests before a server finally replied with a 200 OK.įor indicators of compromise (IOCs), a list of domains unique to this infection follows: In the image below, you'll find HTTP POST requests to different servers as Dalexis tries to find a CnC server that will respond. Dalexis reports to a command and control (CnC) server after the malware is successfully downloaded. The file is encrypted in transit, but I retrieved a decrypted copy from the infected host.
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The bitcoin address for the ransom payment is: 18GuppWVuZGqutYvZz9uaHxHcostrU6Upc (check here to see if any transactions have been made by this bitcoin account).īelow is an image from Sguil on Security Onion for some of the EmergingThreats and ETPRO snort events seen during this infection:ĭalexis uses an HTTP GET request to download CTB-Locker. Had to download a Tor browser to get at the decryption instructions. Instructions for decrypting your files are shown below: The following image shows what happened immediately after opening this Dalexis malware on the desktop:Ī few minutes later, the desktop shows signs of infection by CTB-Locker: If you don't know it, email and ask.Įxtracted malware from these email attachments is an SCR file with an Excel icon.
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The ZIP file is password-protected with the standard password. ZIP file of 24 Dalexis samples from this malspam wave:.PCAP from the infected host (10.8 MB):.Extracted malware (Dalexis downloader):.I infected a host using one of the attachments. The messages have slightly different subject lines, and each email attachment has a different file hash. Below is a flow chart from Tuesday's wave of Dalexis/CTB-Locker malspam: Behavior of this malware is well-documented, but small changes often occur as new waves of malspam are sent out.Ī similar wave of malspam from Monday was reported by. In exchange for a ransom payment, the malware authors will provide a key to decrypt your files. CTB-Locker is ransomware that encrypts files on your computer. Dalexis is often used to deliver CTB-Locker. It drops a CAB file with embedded document that's opened on a user's computer then downloads more malware. This diary concerns a recent malspam wave on Tuesday from a botnet pushing Dalexis/CTB-Locker.ĭalexis is a malware downloader. Fortunately, most of these emails are blocked by our spam filters. I'll see Dridex or Upatre/Dyre campaigns a daily basis.
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These malspam campaigns send malware designed to infect Windows computers. Malicious spam (malspam) is by sent by botnets every day.