2017-01-06 - SUNDOWN EK FROM 188.165.163.226 AND 93.190.143.201

ASSOCIATED FILES:

• ZIP archive of the pcap:  2017-01-06-Sundown-EK-sends-Terdot.A-Zloader.pcap.zip   763 kB (763,107 bytes)

• 2017-01-06-Sundown-EK-sends-Terdot.A-Zloader.pcap   (978,479 bytes)

• ZIP archive of the malware:  2017-01-06-Sundown-EK-malware-and-artifacts.zip   321 kB (320,772 bytes)

• 2017-01-06-Sundown-EK-fash-exploit-78493521.swf   (45,026 bytes)
• 2017-01-06-Sundown-EK-fash-exploit-9643522803.swf   (14,088 bytes)
• 2017-01-06-Sundown-EK-landing-page.txt   (73,418 bytes)
• 2017-01-06-Sundown-EK-payload-Terdot.A-Zloader.exe   (244,224 bytes)
• 2017-01-06-run-Sundown-EK-other-exploit-JHgfjhc.png   (52,591 bytes)

BACKGROUND ON SUNDOWN EXPLOIT KIT:

• Nick Biasini from Cisco's Talos threat intelligence team, wrote about Sundown EK in this October 2016 article:  Sundown EK: You Better Take Care.
• A more recent article on Sundown EK is from TrendLabs Security Intelligence Blog in December 2016:  Updated Sundown Exploit Kit Uses Steganography

OTHER NOTES:

• The URL patterns for Sundown EK changed starting 2017-01-05 to what I'm showing for today.

 

TRAFFIC

Shown above:  Pcap from the infection traffic filtered in Wireshark

 

SUNDOWN EK:

• 188.165.163.226 port 80 - eud.3204.mobi - GET /index.php?9W7EBUOp191ha3GjlA=4y23ZDynh_NRHnyN0aRE9FnWh5o0_xI-rVWoyQUxcwvxksnowbciR2Mb
• 188.165.163.226 port 80 - eud.3204.mobi - GET /JHgfjhc.png
• 188.165.163.226 port 80 - eud.3204.mobi - GET /7/?9643522803
• 188.165.163.226 port 80 - eud.3204.mobi - GET /7/?947545190441&id=225
• 188.165.163.226 port 80 - eud.3204.mobi - GET /7/?78493521
• 93.190.143.201 port 80 - eho.1146.mobi - GET /z.php?id=225
• 93.190.143.201 port 80 - eho.1146.mobi - GET /43526876827345687356872456.php?id=225
• 93.190.143.201 port 80 - eho.1146.mobi - GET /z.php?id=225

POST INFECTION TRAFFIC:

• 54.210.141.161 port 80 - overtgrill.su - POST /FE8hVs3/gs98h.php
• 35.167.23.188 port 80 - overtgrill.su - POST /FE8hVs3/gs98h.php
• checkip.dyndns.org - GET /

 

FILE HASHES

EXPLOITS:

• SHA256 hash:  0744ba67c5f8210fcdcf4acb328df68780e96d10f2c68b8eddbb9a355bca213e
  File description:  Sundown EK Flash exploit returned after GET /7/?9643522803
  File size:  14,088 bytes

• SHA256 hash:  67d598c6acbd6545ab24bbd44cedcb825657746923f47473dc40d0d1f122abb6
  File description:  Sundown EK Flash exploit returned after GET /7/?78493521
  File size:  45,026 bytes

• SHA256 hash:  49cb62e64ce93a825e5fb9b20dc2407a0d943d5c49fa06a464b76c0f04efcc94
  File description:  Sundown EK exploit returned after GET /JHgfjhc.png
  File size:  52,591 bytes

PAYLOADS AND FOLLOW-UP MALWARE:

• SHA256 hash:  05b96b412347a1383d7add644b2bc29142ec79df581655ffca4731dbde742d40
  File description:  Terdot.A/Zloader sent as Sundown EK payload
  File size:  244,224 bytes
  File path:  C:\Users\[username]\AppData\Local\Temp\rad0B36A.tmp.exe
  File path:  C:\Users\[username]\AppData\Local\Temp\rad5EFE3.tmp.exe
  File path:  C:\Users\[username]\AppData\Local\Temp\radB325B.tmp.exe
  File path:  C:\Users\[username]\AppData\Local\Temp\rgh.exe
  File path:  C:\Users\[username]\AppData\Local\Temp\sf.exe
  File path:  C:\Users\[username]\AppData\Local\Temp\yrre.exe
  File path:  C:\Users\[username]\AppData\Local\Temp\z.tmp

 

IMAGES

NOTE: For the folders and most of the files shown below, the names are randomized, so if you infected a Windows host with the same malware sample, you won't have the same folder or file names (except for php.exe and php5ts.dll).

Shown above:  Some of the folders created on the infected Windows host.

 

Shown above:  Contents of C:\Users\[username]\AppData\Roaming\Advui

 

Shown above:  Contents of C:\Users\[username]\AppData\Roaming\Nueqma

 

Shown above:  Contents of C:\Users\[username]\AppData\Roaming\Qiid

 

Shown above:  Contents of C:\Users\[username]\AppData\Roaming\Urhiwy

 

FINAL NOTES

Once again, here are the associated files:

• ZIP archive of the pcap:  2017-01-06-Sundown-EK-sends-Terdot.A-Zloader.pcap.zip   763 kB (763,107 bytes)
• ZIP archive of the malware:  2017-01-06-Sundown-EK-malware-and-artifacts.zip   321 kB (320,772 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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