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Threat Group Cards: A Threat Actor Encyclopedia

Permanent link Tool: Dexter

NamesDexter
LusyPOS
StarDust
CategoryMalware
TypePOS malware, Reconnaissance, Backdoor, Keylogger, Info stealer, Credential stealer, Botnet
Description(Trend Micro) Based on our analysis of the malware, BKDR_DEXTR.A downloads files, sends information, and checks memory for information among others. But the centerpiece of the malware is its ability to collect and send certain information to a remote server. Some of the possible data that can be stolen from POS systems include such as username, hostname, key to decrypt the sent information, OS information, and list of running processes. These data are then presumably duplicated by remote malicious users.

The malware executable is found to be packed or encrypted and when loaded, it loads long garbage code to decrypt the actual code. However, this decryption routine involves only a combination of XOR and ADD instructions, with the use of a hardcoded key. The perpetrators behind ‘Dexter’ malware probably done this to make analysis difficult.
Information<https://blog.trendmicro.com/trendlabs-security-intelligence/infostealer-dexter-targets-checkout-systems/>
<https://www.trustwave.com/en-us/resources/blogs/spiderlabs-blog/the-dexter-malware-getting-your-hands-dirty/>
<https://securitykitten.github.io/2014/12/01/lusypos-and-tor.html>
<https://volatility-labs.blogspot.com/2012/12/unpacking-dexter-pos-memory-dump.html>
<https://kc.mcafee.com/resources/sites/MCAFEE/content/live/PRODUCT_DOCUMENTATION/25000/PD25658/en_US/McAfee_Labs_Threat_Advisory-LusyPOS.pdf>
<https://www.trendmicro.de/cloud-content/us/pdfs/security-intelligence/white-papers/wp-pos-ram-scraper-malware.pdf>
<https://www.secureworks.com/research/point-of-sale-malware-threats>
<https://www.us-cert.gov/ncas/alerts/TA14-002A>
Malpedia<https://malpedia.caad.fkie.fraunhofer.de/details/win.dexter>

Last change to this tool card: 24 May 2020

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All groups using tool Dexter

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Unknown groups

 _[ Interesting malware not linked to an actor yet ]_ 

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

Thailand Computer Emergency Response Team (ThaiCERT)
Electronic Transactions Development Agency

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