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Threat Group Cards: A Threat Actor Encyclopedia

Tool: AtomSilo

Names	AtomSilo
Category	Malware
Type	Ransomware
Description	According to PCrisk, AtomSilo is a type of malware that blocks access to files by encrypting them and renames every encrypted file by appending the '.ATOMSILO' to its filename. It renames '1.jpg' to '1.jpg.ATOMSILO', '2.jpg' to '2.jpg.ATOMSILO', and so on. As its ransom note, AtomSilo creates the 'README-FILE-#COMPUTER-NAME#-#CREATION-TIME#.hta' file.
Information	<https://chuongdong.com//reverse%20engineering/2021/10/13/AtomSiloRansomware/> <https://www.microsoft.com/security/blog/2022/05/09/ransomware-as-a-service-understanding-the-cybercrime-gig-economy-and-how-to-protect-yourself> <https://news.sophos.com/en-us/2021/10/04/atom-silo-ransomware-actors-use-confluence-exploit-dll-side-load-for-stealthy-attack/> <https://www.secureworks.com/research/bronze-starlight-ransomware-operations-use-hui-loader> <https://chuongdong.com/reverse%20engineering/2021/10/13/AtomSiloRansomware/> <https://decoded.avast.io/threatintel/decryptor-for-atomsilo-and-lockfile-ransomware/> <https://twitter.com/siri_urz/status/1437664046556274694?s=20> <https://www.zscaler.com/blogs/security-research/atomsilo-ransomware-enters-league-double-extortion> <https://news.sophos.com/en-us/2022/03/17/the-ransomware-threat-intelligence-center/>
Malpedia	<https://malpedia.caad.fkie.fraunhofer.de/details/win.atomsilo>

Last change to this tool card: 30 November 2023

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All groups using tool AtomSilo

Changed	Name	Country	Observed
APT groups
	Bronze Starlight		2021-Mar 2023

1 group listed (1 APT, 0 other, 0 unknown)

Digital Service Security Center
Electronic Transactions Development Agency

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