We analyzed samples of EMOTET, URSNIF, DRIDEX and BitPaymer and found similar payload loaders and internal data structures, possibly implying that these different groups are familiar with and are working closely together.
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In late October, security researchers from Cymulate showed a proof of concept (PoC) exploiting a logic bug that could allow hackers to abuse the online video feature in Microsoft Office to deliver malware. We indeed identified an in-the-wild sample (detected by Trend Micro as TROJ_EXPLOIT.AOOCAI) in VirusTotal, using this method to deliver the URSNIF information stealer (TSPY_URSNIF.OIBEAO).
Since this kind of attack involves the use of a specially crafted Word document, we can assume that it can arrive on a user’s system through other malware or as an attachment or links/URLs in spam.
Read More A spam campaign we observed in September indicates attackers are angling towards a more sophisticated form of phishing. The campaign uses hijacked email accounts to deliver URSNIF as part of or as a response to an existing email thread.
Read More Trend Micro recently saw increased abuse of the internet query file IQY, similar to the activity detected in June from a Necurs-distributed spam wave that delivered the FlawedAmmyy RAT. It appears cybercriminals are taking advantage of the simple structure of IQY files because they can be used to evade structure-based detection methods.
Our latest observation found the Cutwail botnet distributing spam mails abusing IQY files. The spam campaign specifically targets users in Japan, delivering either the BEBLOH (detected by Trend Micro as TSPY_BEBLOH.YMNPV) or URSNIF (TSPY_URSNIF.TIBAIDO) malware. The spam mails attempt to trick users into clicking the attachment using conventional social engineering baits such as “payment,” “photos sent,” “photos attached,” and “please confirm,” among others. The campaign’s activity was detected on August 6, 2018, and has managed to distribute approximately 500,000 spam mails. The spam distribution has since died down on August 9.
Read More Although many tax scams purely rely on social engineering, other campaigns make use of more sophisticated tools and techniques. We found and analyzed one such campaign delivering the notorious banking trojan known as URSNIF to North American targets.
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