2016-06-25 - MALSPAM - SUBJ: BOLETO CONDOMINIO EM ABERTO

ASSOCIATED FILES:

• ZIP archive of the emails:  2016-06-25-malspam-emails.zip   2.1 kB (2,112 bytes)

• 2016-06-16-1843-UTC.eml   (1,511 bytes)
• 2016-06-25-0228-UTC.eml   (1,501 bytes)

• ZIP archive of the traffic on 2016-06-25:  2016-06-25-malspam-traffic.pcap.zip   22.6 MB (22,616,201 bytes)

• 2016-06-25-malspam-traffic.pcap   (23,804,255 bytes)

• ZIP archive of the malware and artifacts:  2016-06-25-malspam-malware-and-artifacts.zip   24.3 MB (24,305,931 bytes)

• 471Aw.bat   (204 bytes)
• B20062016.js   (5,254 bytes)
• B24062016.js   (4,395 bytes)
• BoT.mp3   (1,925,226 bytes)   NOTE: This file is a zip archive.
• Cad.mp3   (14,854,002 bytes)   NOTE: This file is a zip archive.
• HOSTNAME-PC.jpg   (97 bytes)   NOTE: This is a text file.
• X8YZ   (7,506,104 bytes)   NOTE: This file is a zip archive.
• tNfRz.jpg   (16,204 bytes)

 

NOTES:

• I first ran across this particular boleto malspam campaign last week on 2016-06-16, but I didn't have time to look into it until now.
• Traffic from the two infections is nearly identical, so the pcap archive only contains traffic from the 2016-06-25 infection.
• The zip archive only contains artifacts from 2016-06-25 infection, except for B20062016.js which came from the 2016-06-16 infection.
• This infection worked on a Win7 x64 host, but my infected Win7 x86 (32-bit) host kept crashing after the system rebooted.

 

EMAILS

• 2016-06-16 18:43 UTC - Subject: Boleto Condominio em Aberto (50638) - From: [spoofed recipient's address]
• 2016-06-25 02:28 UTC - Subject: Boleto Condominio em Aberto. (64290) - From: [spoofed recipient's address]

 

TRAFFIC

TRAFFIC ON 2016-06-16:

• googledrive.com GET - /host/0B0WN5mYYinJNY3JlYlhIVS1jV2c/?=Boleto   (HTTPS traffic)
• cl.ly - GET /3L1X1F0J3l39/download/B20062016.js HTTP/1.1
• api.cld.me - GET /3L1X1F0J3l39/download/B20062016.js HTTP/1.1
• s3.amazonaws.com - GET /f.cl.ly/items/3W1e1L2B0c1L0B42280u/B20062016.js?AWSAccessKeyId=AKIAJEFUZRCWSLB2QA5Q&
  Expires=1466110849&Signature=ly1cQrnJjAYd35sYnfULUHB77vY%3D&response-content-disposition=attachment   (HTTPS traffic)
• 146.185.181.235 port 80 - 146.185.181.235 - GET /imagem/Sub.mp3 HTTP/1.1
• 146.185.181.235 port 80 - 146.185.181.235 - GET /imagem/Cad.mp3 HTTP/1.0
• 146.185.181.235 port 80 - 146.185.181.235 - GET /imagem/BoT.mp3 HTTP/1.0
• 146.185.181.235 port 80 - 146.185.181.235 - GET /imagem/Hut.mp3 HTTP/1.0
• 146.185.181.235 port 80 - 146.185.181.235 - POST /cadastrar/point.php HTTP/1.0

 

TRAFFIC ON 2016-06-26:

• googledrive.com - GET /host/0B0WN5mYYinJNY3JlYlhIVS1jV2c/?=Boleto   (HTTPS traffic)
• cl.ly - GET /0h0J3G1k1c3W/download/B24062016.js HTTP/1.1
• api.cld.me - GET /0h0J3G1k1c3W/download/B24062016.js HTTP/1.1
• s3.amazonaws.com - GET /f.cl.ly/items/0U0O3621230R3M3m3Z1b/B24062016.js?AWSAccessKeyId=AKIAJEFUZRCWSLB2QA5Q&
  Expires=1466830442&Signature=hW0gnOQR0IhnqAeYX%2B7rtqxfODc%3D&response-content-disposition=attachment   (HTTPS traffic)
• 146.185.166.74 port 80 - 146.185.166.74 - GET /api/Sub.mp3 HTTP/1.1
• 146.185.166.74 port 80 - 146.185.166.74 - GET /api/Cad.mp3 HTTP/1.0
• 146.185.166.74 port 80 - 146.185.166.74 - GET /api/BoT.mp3 HTTP/1.0
• 146.185.166.74 port 80 - 146.185.166.74 - GET /api/Hut.mp3 HTTP/1.0
• 146.185.166.74 port 80 - 146.185.166.74 - POST /log/point.php HTTP/1.0

 

ARTIFACTS

SOME ARTIFACTS FROM THE INFECTED HOST ON 2016-06-26:

• B24062016.js   (downloaded .js file)
• C:\Users\[username]\AppData\Local\Temp\[hostname].jpg   (deleted)
• C:\Users\[username]\AppData\Local\Temp\471Aw.bat   (deleted)
• C:\Users\[username]\AppData\Local\Temp\Hut.mp3   (copied to X8YZ and deleted)
• C:\Users\[username]\AppData\Local\Temp\X8YZ   (same file as Hut.mp3)
• C:\Users\[username]\AppData\Roaming\Microsoft\Windows\Templates\tNfRz.jpg
• C:\Users\[username]\AppData\Roaming\Microsoft\Windows\Templates\t0A4fP0q\Bot.mp3
• C:\Users\[username]\AppData\Roaming\Microsoft\Windows\Templates\t0A4fP0q\Cad.mp3

 

IMAGES FROM 2016-06-25

Shown above:  An example from this boleto malspam campaign on 2016-06-25.

 

Shown above:  Looking at the email headers (and body) from the 2016-06-25 example of this malspam.

 

Shown above:  Following the from the email and downloading the .js file.

 

Shown above:  What the .js file from 2016-06-26 looks like.

 

Shown above:  Traffic from the 2016-06-25 infection filtered in Wireshark.

 

Shown above:  A popup window from the infected host after double-clicking the .js file.

 

Shown above:  What happened when I proceeded with the popup window.

 

Shown above:  The .bat file referenced in the previous image before it deleted itself.

 

Shown above:  Another file that appeared in the infected user's AppData\Local\Temp directory before it deleted itself.

 

Shown above:  A closer look at the file C:\Users\[username]\AppData\Local\Temp\X8YZ  (downloaded as filename: Hut.mp3).

 

Shown above:  Two other zip archives that were downloaded during the 2016-06-25 infection.

 

Shown above:  Interesting file that appeared at C:\Users\[username]\AppData\Roaming\Microsoft\Windows\Templates\tNfRz.jpg.

 

Shown above:  One of the directories had different artifacts after rebooting the infected host.

 

FINAL NOTES

Once again, here are the associated files:

• ZIP archive of the emails:  2016-06-25-malspam-emails.zip   2.1 kB (2,112 bytes)
• ZIP archive of the traffic on 2016-06-25:  2016-06-25-malspam-traffic.pcap.zip   22.6 MB (22,616,201 bytes)
• ZIP archive of the malware and artifacts:  2016-06-25-malspam-malware-and-artifacts.zip   24.3 MB (24,305,931 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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