In an undated online post, which listed "March 2020" as the date, the company said it had become aware of "unusual activity on its systems" early last Sunday (15 March).
Security sources have indicated to iTWire that the ransomware in question is Maze as the people behind it often post the names of companies they have attacked on their website.
Both Henning Harders Sydney and Melbourne offices have been listed by the people behind Maze as sites that were attacked.
Affected customers were advised to contact their respective key account manager for any further information.
According to its own website, Henning Harders has operations in Sydney, Melbourne, Brisbane, Perth, and Orange.
Across the ditch, it has offices in Auckland and Wellington which were opened after it acquired the global logistics firm Profile Global. The company has a total of 130 staff.
Contacted for comment, a Henning Harders spokesperson told iTWire that the investigation into the incident was still underway.
The spokesperson said the company's operations continued as normal.
In response to a specific query, the spokesperson said the Australian Cyber Security Centre had been informed about what had happened.