Citizen Lab and Microsoft exposed Candiru, an Israel-based mercenary spyware vendor also known as Saito Tech Ltd., after investigators recovered a Windows malware sample dubbed DevilsTongue from a politically active victim in Western Europe. The investigation tied Candiru to a large surveillance operation that used more than 750 spoofed domains masquerading as media outlets, advocacy groups, international organizations, and technology brands to lure targets and support spyware delivery.
Microsoft said the operation exploited two Windows privilege-escalation zero-days, CVE-2021-31979 and CVE-2021-33771, which it patched as part of its response. Researchers and Microsoft linked the activity to at least 100 victims across countries including Palestine, Israel, Iran, Lebanon, Yemen, Spain, the United Kingdom, Turkey, Armenia, and Singapore, with journalists, dissidents, activists, politicians, and human rights defenders among those targeted; the infrastructure was also connected to the CHAINSHOT exploit kit and earlier Chrome and Microsoft Office zero-day exploitation.

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Microsoft published details on a private-sector offensive actor using 0-day exploits and DevilsTongue malware. Citizen Lab says Microsoft observed at least 100 victims across countries including Palestine, Israel, Iran, Lebanon, Yemen, Spain, the United Kingdom, Turkey, Armenia, and Singapore, including journalists, dissidents, activists, politicians, academics, and embassy workers.
Google Threat Analysis Group reported Chrome zero-days CVE-2021-21166 and CVE-2021-30551, and Citizen Lab says eight of the nine exploit distribution websites in that report matched Candiru's CF3 infrastructure fingerprint. Citizen Lab also notes Google linked Microsoft Office exploit CVE-2021-33742 to the same operator.
Microsoft patched CVE-2021-31979 and CVE-2021-33771, two Windows privilege escalation vulnerabilities that Citizen Lab says were discovered during joint analysis of Candiru spyware with Microsoft Threat Intelligence Center.
Citizen Lab says Candiru, an Israel-based spyware company also known as Saito Tech Ltd., was founded in Tel Aviv in 2014.
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