2016-11-28 - PSEUDO-DARKLEECH RIG-V FROM 194.87.238[.]156 SENDS CERBER RANSOMWARE

NOTICE:

• The zip archives on this page have been updated, and they now use the new password scheme.  For the new password, see the "about" page of this website.

ASSOCIATED FILES:

• 2016-11-28-2nd-run-pseudoDarkleech-Rig-V-sends-Cerber-ransomware.pcap.zip   389 kB (388,757 bytes)

• 2016-11-28-2nd-run-pseudoDarkleech-Rig-V-sends-Cerber-ransomware.pcap   (509,913 bytes)

• 2016-11-28-2nd-run-pseudoDarkleech-Rig-V-and-Cerber-ransomware-files.zip   565.8 kB (565,831 bytes)

• 2016-11-28-2nd-run-page-from-wordtemplates_org-with-injected-script.txt   (54,453 bytes)
• 2016-11-28-2nd-run-pseudoDarkleech-Rig-V-artifact-MXj6sFosp.txt   (1,137 bytes)
• 2016-11-28-2nd-run-pseudoDarkleech-Rig-V-flash-exploit.swf   (12,174 bytes)
• 2016-11-28-2nd-run-pseudoDarkleech-Rig-V-landing-page.txt   (90,012 bytes)
• 2016-11-28-2nd-run-pseudoDarkleech-Rig-V-payload-Cerber-ransomware-radC2813.tmp.exe   (284,505 bytes)
• 2016-11-28-Cerber-ransomware-decryption-instructions.bmp   (1,920,054 bytes)
• 2016-11-28-Cerber-ransomware-decryption-instructions_README_.hta   (67,727 bytes)

BACKGROUND ON RIG EXPLOIT KIT:

• I'm currently tracking 3 versions of Rig EK as classified in an October 2016 blog post by Kafeine.
• Rig-V: a "VIP version" with new URL patterns and RC4 encryption for the payload.  Used by the Afraidgate, EITest, and pseudoDarkleech campaigns.
• Rig-E: a variant with old URL patterns, but uses with RC4 encryption for the payload.  Also known as Empire Pack.  I often see Rig-E used by the EITest campaign.
• Rig standard: uses new URL patterns introduced by Rig-V, but old obfuscation (ASCII string to XOR the payload binary).  The pseudoDarkleech campaign formerly used Rig standard to send CryptFile2 (Cerber) ransomware before switching to Rig-V for that purpose.

BACKGROUND ON THE PSEUDO-DARKLEECH CAMPAIGN:

• Something I wrote on exploit kit (EK) fundamentals:  link
• 2016-03-22 - PaloAlto Networks Unit 42 blog:  Campaign Evolution: Darkleech to Pseudo-Darkleech and Beyond
• 2016-07-02 - SANS ISC diary:  Change in patterns for the pseudoDarkleech campaign
• 2016-09-14 - Malware-traffic-analysis.net:  The pseudoDarkleech campaign starts using Rig EK instead of Neutrino EK
• 2016-10-03 - Malware-traffic-analysis.net:  The pseudoDarkleech campaign stops sending CryptXXX, starts sending Cerber ransomware

CERBER UPDATED:

• Cerber ransomware recently transitioned from version 4 to version 5 (link).  Today I saw version 5.0.1.
• No drastic changes for network traffic associated with Cerber ransomware.  Just a change in the UDP traffic (see below).

 

Shown above:  Flowchart for this infection traffic.

 

TRAFFIC

Shown above:  Injected script from the pseudoDarkleech campaign from the compromised site.

 

Shown above:  Pcap of the infection traffic filtered in Wireshark.

 

ASSOCIATED DOMAINS:

• www.wordtemplates[.]org - Compromised site
• 194.87.238[.]156 port 80 - try.uludan[.]com - Rig-V
• 192.168.0[.]0 to 192.168.0[.]31 (192.168.0[.]0/27) UDP port 6892 - Cerber ransomware post-infection UDP traffic
• 194.165.16[.]0 to 194.165.17[.]255 (195.165.16[.]0/23) UDP port 6892 - Cerber ransomware post-infection UDP traffic
• 210.16.101[.]23 port 80 - ffoqr3ug7m726zou.ejc92c[.]top - Cerber ransomware post-infection HTTP traffic

 

FILE HASHES

FLASH EXPLOIT:

• SHA256 hash:  a51c4a6e8797b75620efb64edf297bd2137230a45c18d96f66a3e9edbe988403
  File name:  2016-11-28-2nd-run-pseudoDarkleech-Rig-V-flash-exploit.swf   (12,174 bytes)

PAYLOAD (CERBER RANSOMWARE):

• SHA256 hash:  222bb4e588b0865f36047b4eb2e725c715a289898bc630b1245c46a0289522ff
  File name:  C:\Users\[Username]\AppData\Local\Temp\radC2813.tmp.exe   (284,505 bytes)

 

IMAGES

Shown above:  Desktop of an infected Windows host after checking the decryption instructions.

 

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