(Proofpoint) PowerSpritz is a Windows executable that hides both its legitimate payload and malicious PowerShell command using a non-standard implementation of the already rarely used Spritz encryption algorithm. PowerSpritz decrypts a legitimate Skype or Telegram installer using a custom Spritz implementation with the key “Znxkai@if8qa9w9489”. PowerSpritz then writes the legitimate installer to disk in the directory returned by GetTempPathA either as a hardcoded filename such as SkypeSetup.exe or, in some versions, as the filename returned by GetTempFileNameA. The installer is then executed to trick the potential victim into thinking they downloaded a legitimate, working application installer or update. Finally, Spritz uses the same key to decrypt a PowerShell command that downloads the first stage of {{PowerRatankba}}.
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2017-12-19 by Darien Huss from Proofpoint
Tool: PowerSpritz
Names: PowerSpritz
Description: (Proofpoint) PowerSpritz is a Windows executable that hides both its legitimate payload and malicious PowerShell command using a non-standard implementation of the already rarely used Spritz encryption algorithm. PowerSpritz decrypts a legitimate Skype or Telegram installer using a custom Spritz implementation with the key “Znxkai@if8qa9w9489”. PowerSpritz then writes the legitimate installer to disk in the directory returned by GetTempPathA either as a hardcoded filename such as SkypeSetup.exe or, in some versions, as the filename returned by GetTempFileNameA. The installer is then executed to trick the potential victim into thinking they downloaded a legitimate, working application installer or update. Finally, Spritz uses the same key to decrypt a PowerShell command that downloads the first stage of {{PowerRatankba}}.
Category: Malware
Type: Dropper, Downloader
Information: https://www.proofpoint.com/sites/default/files/pfpt-us-wp-north-korea-bitten-by-bitcoin-bug.pdf
Malpedia: https://malpedia.caad.fkie.fraunhofer.de/details/ps1.powerspritz
Last-card-change: 2020-04-23
Source: https://apt.etda.or.th/cgi-bin/listtools.cgi
| TA0043 | TA0042 | TA0001 | TA0002 | TA0003 | TA0004 | TA0005 | TA0006 | TA0007 | TA0008 | TA0009 | TA0011 | TA0010 | TA0040 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Reconnaissance | Resource Development | Initial Access | Execution | Persistence | Privilege Escalation | Defense Evasion | Credential Access | Discovery | Lateral Movement | Collection | Command and Control | Exfiltration | Impact |