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Threat Group Cards: A Threat Actor Encyclopedia

Tool: MirrorStealer

Names	MirrorStealer
Category	Malware
Type	Credential stealer
Description	(ESET) MirrorStealer, internally named 31558_n.dll by MirrorFace, is a credential stealer. To the best of our knowledge, this malware has not been publicly described. In general, MirrorStealer steals credentials from various applications such as browsers and email clients. Interestingly, one of the targeted applications is Becky!, an email client that is currently only available in Japan. All the stolen credentials are stored in %TEMP%\31558.txt and since MirrorStealer doesn’t have the capability to exfiltrate the stolen data, it depends on other malware to do it.
Information	<https://www.welivesecurity.com/2022/12/14/unmasking-mirrorface-operation-liberalface-targeting-japanese-political-entities/>

Last change to this tool card: 27 December 2022

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All groups using tool MirrorStealer

Changed	Name	Country	Observed
APT groups
	Operation LiberalFace, MirrorFace		2022

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

Digital Service Security Center
Electronic Transactions Development Agency

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