Sigma
thegentlemenThis record tracks a ransomware attack claimed by the thegentlemen group against Sigma. It collects the publicly disclosed attack details — sector, location and timeline — as published on the operator's leak site and indexed by Breach House.
Window Zero
EXPOSURE GAPWindow Zero is the time the breach stayed in the open before anyone said so — the gap between when the attack was first discovered on the operator's leak site (t1) and when it was publicly disclosed (t2). The wider this window, the longer victims, staff and customers were exposed with no warning.
Attack Summary
Sigma Informatique, also known as Groupe Sigma, is a mission-driven IT and digital services company headquartered in La Chapelle-sur-Erdre, France, with over 50 years of experience in the sector. The firm specializes in software publishing, integration of tailor-made digital solutions, and outsourced technology services, supporting clients through their digital transition with 700 employees across five agencies. As a 100% French enterprise, Sigma provides comprehensive IT support and innovation services to businesses seeking impactful digital transformation. The company was listed as a ransomware victim associated with the threat actor thegentlemen.
Leak Screenshots
SAMPLEProof-of-breach screenshots the operator posted from the stolen data. Previews are redacted and locked — the originals are available on HaveIBeenRansom.