Among the handwritten scrawls by ‘Lord of the Shadows’ Samir Abd Muhammad al-Khlifawi is a plot to infiltrate and intimidate families and communities across the region.
The 31-page document, obtained by a German newspaper, shows the former colonel in the intelligence services of Hussein’s air force planned to recruit a legion of spies as the group’s sphere of influence expanded.
It shows detailed charts, lists and schedules for how the group, which has claimed thousands of lives, would swallow up more territory.
The notes reveal Haji Bakr, as he is better known, planned to blackmail those who didn’t comply with the regime’s strict religious code, using conscripts as young as 16.
The group even married off women to influential families in a bid to widen their influence.
He subsequently spent time in the notorious prison camp Abu Ghraib, run by the US, and was reportedly killed in a firefight in Iraq in January 2014.
The report claims IS is still using information gleaned from years of surveillance – including data from banks and land registry offices – to wring money from millions of people who live under IS control.
The papers were handed to journalists at Der Spiegel after IS fighters were forced to abandon their headquarters in Aleppo, Syria, last year.
Christoph Reuter, the report’s author, wrote: “What Bakr put on paper, page by page, with carefully outlined boxes for individual responsibilities, was nothing less than a blueprint for takeover”.
The pages show that plans by the architect of IS stretched back years, with detailed notes on how the group would spread across northern Syria using command posts disguised as missionary centres.
The latest revelation offers the best glimpse yet into the secretive jihadist organisation.
Until now, experts have explained the rapid rise of IS as either an off-shoot of the already established al-Qaeda terror group – responsible for the 9/11 attack on America – or a mafia-like network of influential families extorting money from already-impoverished communities in the region.
But the cache of secret documents reveals undeniable links between the cult and Hussein’s bloody dictatorship.
It says Bakr’s blueprint was simply a modified version of plans used by Hussein to maintain absolute rule.
The papers also hint at links between the current Syrian regime and IS, with a map of the chain of command scribbled with ballpoint pen on the Syrian Defence Ministry’s letter-headed paper.
Journalist Mr Reuter dismissed the link with the Syrian president Bashar al-Assad’s regime as “presumably a coincidence”.