2018-01-09 - MALSPAM PUSHING JAVA-BASED RAT

ASSOCIATED FILES:

• Zip archive of the pcap:  2018-01-09-Java-based-RAT-malspam-traffic.pcap.zip   490 kB (489,640 bytes)

• 2018-01-09-Java-based-RAT-malspam-traffic.pcap   (534,031 bytes)

• Zip archive of the email and malware:  2018-01-09-Java-based-RAT-email-and-malware.zip   1.6 MB (1,633,585 bytes)

• 2018-01-08-Java-based-RAT-malspam-UTC.txt   (7,736 bytes)
• ImportantSign_PDF.jar   (712,446 bytes)
• ImportantSign_PDF.zip   (696,956 bytes)
• _0.247387460198232888134367552441532945.class   (247,088 bytes)

NOTES:

• This often gets tagged as "Adwind", but it's gone through a few name changes, and it might be called jRAT now.

 

WEB TRAFFIC BLOCK LIST

Indicators are not a block list.  If you feel the need to block web traffic, I suggest the following domain:

• prodocusign.com
• vvrhhhnaijyj6s2m.onion.top

 

EMAIL

Shown above:  Screenshot of the email.

 

EMAIL INFORMATION:

• Date:  Monday, 2018-01-08 at 21:33 UTC
• Subject:  RE: FYI
• From:  Dean Stanley <dstanley@accutemp.net>
• Message-ID:  <F8CCF827-C349-46FC-9F0B-C67C290307C5@accutemp.net>
• Received: from NAM02-BL2-obe.outbound.protection.outlook.com ([104.47.38.236])
• Link in the email:  hxxp://producsign.com/ImportantSign_PDF.zip

 

Shown above:  Downloading the malicious zip archive and extracting its contents.

 

TRAFFIC

Shown above:  Infection traffic in Wireshark.

 

INFECTION TRAFFIC:

• 23.229.193.160 port 80 - prodocusign.com - GET /ImportantSign_PDF.zip
• 46.246.120.179 port 443 - vvrhhhnaijyj6s2m.onion.top - HTTPS traffic
• 91.236.116.180 port 7676 - Attempted TCP connections (SYN packets sent, but RST from server)

 

MALWARE

ZIP ARCHIVE FROM LINK IN THE EMAIL:

• SHA256 hash:  726d745b31a66b17db70353e3f5ae58ca020401ef29401364165bc0aa23a2f0d
  File size:  712,446 bytes
  File name:  ImportantSign_PDF.zip

JAVA ARCHIVE (.JAR) FILE EXTRACTED FROM THE ZIP ARCHIVE:

• SHA256 hash:  ffcbbe10a4e0ececf0b13e3b06c329ebc11d4f394daa8ad3dc8adc3d6949aa6f
  File size:  712,446 bytes
  File name:  ImportantSign_PDF.jar
  File location:  C:\Users\[username]\AppData\WCUkrffrYPW\WUrfrLvepB.JStdFrfrc

ARTIFACT FROM THE INFECTED WINDOWS HOST:

• SHA256 hash:  97d585b6aff62fb4e43e7e6a5f816dcd7a14be11a88b109a9ba9e8cd4c456eb9
  File size:  247,088 bytes
  File name:  ImportantSign_PDF.jar
  File location:  C:\Users\[username]\AppData\Local\Temp\_0.247387460198232888134367552441532945.class
  File location:  C:\Users\[username]\AppData\Local\Temp\_0.3243062791444255803638734785218251.class
  File location:  C:\Users\[username]\AppData\Local\Temp\_0.79817373850884391680127356134437643.class
  File location:  C:\Users\[username]\AppData\Local\Temp\_0.97236765186552721410066307447487038.class

WINDOWS REGISTRY ENTRY FOR PERSISTENCE:

• Registry Key:  HKCU\Software\Microsoft\Windows\CurrentVersion\Run
• Value name:  raFnSZOca
• Value Type:  REG_EXPAND_SZ
• Value Data:  "C:\Users\[username]\AppData\Roaming\Oracle\bin\javaw.exe" -jar "C:\Users\[username]\AppData\WCUkrffrYPW\WUrfrLvepB.JStdFrfrc"

 

IMAGES

Shown above:  Registry key and associated files on the infected Windows host.

 

FINAL NOTES

Once again, here are the associated files:

• Zip archive of the pcap:  2018-01-09-Java-based-RAT-malspam-traffic.pcap.zip   490 kB (489,640 bytes)
• Zip archive of the email and malware:  2018-01-09-Java-based-RAT-email-and-malware.zip   1.6 MB (1,633,585 bytes)

ZIP files are password-protected with the standard password.  If you don't know it, look at the "about" page of this website.

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