Candiru / Sourgum
Candiru / Sourgum (canonical company naming "Candiru Ltd" founded 2014 by Eran Shorer + Yaakov Weizman in Tel Aviv Israel - "Saito Tech Ltd" current operating name - "Integrity Labs Ltd" post-2025 Integrity Partners US investment firm $30M acquisition restructuring; Microsoft canonical naming "Sourgum".
primary Windows spyware product "DevilsTongue" per Microsoft naming) is an Israeli private offensive cyber operations contractor / commercial spyware vendor, operationally Israel's second- largest cyber-espionage firm after NSO Group per industry consensus, with signature investment ecosystem overlap with NSO Group (chairman Isaac Zack is an early NSO Group investor.
Founders Group angel syndicate operated by NSO co-founders Omri Lavie + Shalev Hulio invested in Candiru) and workforce primarily drawn from Israeli Unit 8200 signals intelligence alumni.
signature operational tradecraft is DevilsTongue Windows spyware (cluster- defining complex modular multi-threaded malware written in C and C++ with both user-mode and kernel-mode capabilities + novel detection evasion mechanisms + DLLs encrypted on disk and only decrypted in memory + configuration/tasking data separate from malware) plus multi-platform capability (iOS + Android + macOS + Windows + cloud accounts)
signature Windows kernel 0day exploitation chain CVE-2021-31979 + CVE-2021-33771 (Windows NTOS integer overflow + privilege escalation patched Microsoft July 2021 Patch Tuesday) chained with Chrome + Internet Explorer + WebKit/Safari browser 0days documented by Google TAG.
signature 750+ websites infrastructure documented by Citizen Lab Internet-scan mapping with domains masquerading as Amnesty International + Black Lives Matter + Russian postal service + media companies + civil-society organizations.
WhatsApp single- use URL phishing delivery vector + drive-by exploits + network data tampering / MitM + malicious documents + physical intrusion per leaked Candiru proposal.
Microsoft MSTIC + Citizen Lab canonical joint disclosure July 15, 2021 documented 100+ victims in Palestine + Israel + Iran + Lebanon + Yemen + Spain (Catalonia) + UK + Turkey + Armenia + Singapore including politicians + human rights activists + journalists + academics + embassy workers + political dissidents (despite stated restricted- territory list of US + Russia + China + Israel + Iran); first publicly-documented deployment via Kaspersky 2019 Uzbekistan State Security Service discovery (Uzbekistan SSS used Kaspersky antivirus to test Candiru spyware detection on itt.uz domain, enabling Kaspersky to identify Saudi Arabia and UAE Candiru clients)
signature corporate name change obfuscation tradecraft (Candiru - Grindavik - Tabatha - Saito Tech - Integrity Labs) operationally consistent with cyber-mercenary industry sensitivity to public exposure.
€16M leaked Candiru proposal pricing model with unlimited infection attempts + 10 concurrent device monitoring + Signal Private Messenger decryption add-on capability.
US Department of Commerce Entity List sanctions November 2021 + 2025 Integrity Partners acquisition + Integrity Labs Ltd corporate restructuring (operationally a sanctions-evasion- style corporate pivot)
per Recorded Future Insikt Group August 2025 infrastructure analysis: 8 distinct operational clusters identified with 5 currently active (Hungary + Saudi Arabia confirmed active + Indonesia active until November 2024)
fills the 2nd cyber-mercenary / private-offensive-actor cell in the curated corpus following nso_group_pegasus (1st cyber-mercenary cluster) , operationally distinct from NSO Group through Windows- focused DevilsTongue spyware specialization.