Researchers reported a targeted malware campaign against French government, construction, and real-estate organizations that used GDPR-themed phishing emails with macro-enabled Microsoft Word documents to deploy a backdoor dubbed Serpent. The infection chain relied on steganography, with the initial document fetching an image from fhccu.com that concealed a Base64-encoded PowerShell script; that script installed Chocolatey, then Python and related packages including pip and PySocks, before retrieving a second image containing the Python-based backdoor payload.
Once installed, Serpent contacted command-and-control infrastructure through Tor proxy domains such as onion.pet, polled for host-specific commands, executed them on compromised systems, and exfiltrated results by uploading output to termbin.com and returning the generated URL to a second C2 endpoint. Researchers also highlighted an unusual defense-evasion method in which schtasks.exe created a temporary scheduled task linked to Event ID 777, causing the payload to run as a child of taskhostsw.exe; despite the sophistication of the operation, the activity was not attributed to a known threat actor and the attackers’ ultimate objectives remained unclear.

Get the infrastructure and lures behind it.
2 events from the most recent confirmed update back to the earliest known activity.
VMware published a technical analysis of the Serpent malware campaign targeting French government agencies and construction firms. The report detailed the phishing-based infection chain, steganographic payload delivery from fhccu.com, onion.pet command-and-control infrastructure, Termbin exfiltration, and provided YARA rules and indicators of compromise.
Proofpoint reported a targeted phishing campaign against French organizations in the construction, real estate, and government sectors that used macro-enabled Word documents and GDPR-themed lures to deploy a backdoor it named Serpent. The report described the attack chain using steganographic image payloads, Chocolatey, Python, Tor-accessible onion.pet C2 servers, and Termbin-based exfiltration.
Vulnerabilities, threat actors, malware, products, organizations, breaches, and observables Mallory has linked to this story. Indicator values are masked here and available in full in the app.
Indicator values are masked on this page. View all 35 in Mallory Domains, IPs, hashes, and URLs are exportable to your SIEM.
Get the infrastructure, lures, and IOCs behind this campaign, ready to push into your email and identity stack.
4 references tracked. Mallory keeps watching after this page renders.
pypi.org
Open sourceblogs.vmware.com
Open sourcebleepingcomputer.com
Open sourceproofpoint.com
Open sourceMap indicators from this story to your assets and identify affected systems in minutes.
Every observed campaign, victim, and pivot linked to actors named in this story.
Malware, exploits, and IOCs connected to the activity described here.
YARA, Sigma, and Snort rules deployed to your SIEM as soon as they’re published.
Get matching new stories delivered to your team as they break — not the next morning.
Ask questions about this story and take action on the answers.