![]() This will take all the content of the Folder2Iso folder and create an ISO of it. Run Folder2Iso.exe "Folder2Iso" "%USERPROFILE%\Downloads\" "DECLASS" 0 0 0 "None". Open a Windows command prompt and cd to the working directory.In the Folder2Iso directory, create a shortcut called Reports and set the Target to: C:\Windows\System32\rundll32.exe "DOCUMENTS.DLL",PlatformClientMain.Copy and rename the DLL payload to DOCUMENTS.dll and put it in the Folder2Iso of the working directory.Note we are using the Folder2Iso project to create the ISO. ![]() Copy the src folder from our GitHub to a working directory on your Windows system.If you are a SCYTHE user, create a new SCYTHE campaign, download a 32-bit or 64-bit DLL with the entry-point function name of "PlatformClientMain". Set up Command and Control (C2) using HTTPS and generate a DLL payload.While compromising a third-party web service and sending email through that service will be out of scope for most Red and Purple Team engagements, we can emulate the other adversary behaviors to test attack, detect, and respond. We went ahead and documented this in our Community Threats GitHub under the Compound Actions folder and also committed the test to the Atomic Red Team project as it did not have any tests for T1553.005. As we like to map to MITRE ATT&CK, this technique most closely resembles T1553.005 - Subvert Trust Controls: Mark-of-the-Web Bypass. Packaging a payload in an ISO image file is interesting because when downloaded from the internet, it will bypass the Mark-of-the-Web security controls. T1071 - Application Layer Protocol: HTTPS heartbeat of 62 seconds and jitter of 39% T1204.002 - User Execution: Malicious File (Windows Explorer Shortcut) T1218.011 - Signed Binary Proxy Execution: Rundll32 T1553.005 - Subvert Trust Controls: Mark-of-the-Web Bypass (ISO Image) T1566.002 - Phishing: Spearphishing Link (Link downloads ISO image) T1566.003 - Phishing: Spearphishing via Service (Constant Contact) T1584.006 - Compromise Infrastructure: Web Services (compromised the Constant Contact account of USAID) NOBELIUM, the Russian threat actor behind SolarWinds compromised Constant Contact to send malicious emails with a weaponized ISO file The ISO file contained a decoy PDF file, a DLL, and a shortcut file that executed Rundll32.exe: T1204.002 & T1218.011Ĭommand and Control is established via HTTPS: T1071.001& T1573.Opening an ISO file bypassed Mark-of-the-Web security control, evading defenses: T1553.005 ISO files are images that can be mounted as “Disk Drives”.NOBELIUM sends emails to USAID subscribers with a link that downloads an ISO file: T1566.002.This is significant because most subscribers are accustomed to receiving emails from USAID via Constant Contact and are essentially a known, trusted email they are used to receiving: T1566.003 Constant Contact is an email service to send newsletters and updates to anyone that subscribes.NOBELIUM, the Russian threat actor behind SolarWinds, compromised the Constant Contact account of USAID: T1584.006.Microsoft was quick to release an alert and then a number of follow up posts when it realized that NOBELIUM, the same threat actor behind the attacks against SolarWinds, SUNBURST, TEARDROP, and GoldMax, compromised Constant Contact:Ĭyber Threat Intelligence reports can be dense and long, so here is a quick summary: We also committed an atomic test to the Atomic Red Team project. For this post, we look at the recent attack from NOBELIUM and show how to emulate these techniques with SCYTHE. Matt Graber was quick in putting together a PowerShell script that highlights why attackers likely choose ISO/IMG as a delivery mechanism: it evades SmartScreen because Mark-of-the-Web (MOTW) cannot be applied to non NTFS volumes. We had not considered nor documented using an ISO file as a defense evasion method so we started looking into it after this report was published. Microsoft released a blog post late on Thursday about a new sophisticated email-based attack from NOBELIUM, the SolarWinds threat actor, where they compromised Constant Contact to send malicious emails with a weaponized ISO file. It's a software very heavily used in countries such as Singapore, United Arab Emirates, and Slovakia.Evading Defenses with ISO files like NOBELIUM It's available for users with the operating system Windows 98 and former versions, and it is available in English.Ībout the download, PowerZip is a slick program that will require less free space than the average program in the section Software utilities. The current version of the program is and it has been updated on.
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