Monday, September 9, 2013

MMD-0005-2013 - A Leaked Malvertisement, Cutwail+BHEK & Triple Payloads of "Syria Campaign"

We've been in a good undercover coordination on fighting comeback botnet (still on it-->HERE) when we spotted this threat. It's related to recent event and malvertisement so I thought better to share this information. On the 1st September 2013 during our monitoring, we intercepted a communication within one scum into another, with the message as per follows:
Evaluating the authenticity of the message and understanding the specific spam template used and the urgency of the threat we sent "check your perimeter" warning to all group of researchers that we could reach. This is a definitely spooky encouragement message for an attack that the ring of cyber scums were going to hit.

On early September some of our friends started to spot (i.e.-->HERE) the related threat, and on September 7th I personally received the sample in my honeypot as per below full email snapshot:

Email header is shown the following data:

It shows us a 100% plastic surgery of faking relay data, if I may explain as follows; the first line it fakes the facebook envelop-from data(used to be grabbed via HELO), supported by the line #7, the fake SMTP HELO communication trace. We will see also the fake email client signature shows in header part of "User-Agent", we've seen this fake MUA data in many spams of BHEK before too.

We see also a fake local network relay data with the lame Message-ID generated by fake Microsoft SMTP server, why is it lame? Because they use same strings in most of the similar spams sent recently. Furthermore, you'll see the line 7 & 9 written IP address of, which in my opinion wasn't close to reality either, judging by the below lookups that ending up to Iran/Teheran network, which reminds me the DoD network case (link-->HERE)faked by the same malvertisement:

inetnum: -
netname:        tckhr-DSL
descr:          Telecommunication Company of Khorasan Razavi for ADSL users
country:        IR
admin-c:        JS10218-RIPE
tech-c:         JS10218-RIPE
status:         ASSIGNED PA
mnt-by:         AS12880-MNT
source:         RIPE # Filtered

person:         Jamil Sabaghi
address:        Khomeini ST Mashhad Iran
phone:          +98 511 604 44 40
nic-hdl:        JS10218-RIPE
mnt-by:         AS12880-MNT
source:         RIPE # Filtered
But yet, there is still also a possibility of the infected machine by SpamBot in that address, it's to be checked by local authority since I won't be fooled by this scum and have no interest to fire my nmap to that direction during this "heat up" political season. BTW the "faking" of the MessageID (see no 3), and also fake MUA data (no 4), are the typical work of the SpamBot, suspected the work of Cutwail spambot template.

The email has one link that pointing into a malicious infector site which as per shown in the bottom of email snapshot above, the domain name of is a recent well-known Blakhole infector URL of a hacked site with long history of blackhole infection during past months--> HERE, the Robtex diagram below is proofing the dedicated usage of the IP that supporting the theory:

But yet, the infection coming from this IP ( is quite rapid, it will do you no harm to block the IP address and the below domains to prevent infections: 

Back to the time line of infection, a good report by Umbrella Security Graph tool providing me the first time and the peak of current threat's infection occured via the infector domains as per follows:

This explains the access from the PC for infection in timing which is matched to the malvertisement used.

Moving on, back to the URL of the infector, which ending up contains of multiple .JS javascript file's links coded in the index.html (as usual BHEK infector scheme), we went throgh same writing dozen times so I am not going to be into details for this matter, shortly, the inside of .JS files is written one single link that ending up into a Blackhole Exploit Kit landing page below:

luggagepreview .com/topic/able_disturb_planning.php
Again for confirming the infection timing I checked the landing page's domain DNS query request via Umbrella Security Graph below:

The result is suggesting me this malvertisement "possibility" of infection's timeline.

Seeking further into the IP address used for this blackhole in passive DNS, it was also recorded the other 12 domains of the same IP which having malware requests as per below details (I share this for the blocking purpose, in case you didn't have it yet):
Well OK, then what does this BHEK do?

The Story of Exploitation and Infection

I used the method of applet access that must have been written in the landing page to make it guides me to the exploit infector, I picked this method since I know the java infection is a kind of "HOT" in he BHEK trend recently, hopefully will see something new stuff to break. Tweaking with your preferred fetcher you'll get this jar if you do it right, my log as PoC:

HTTP/1.1 200 OK
Server: nginx/0.7.67
Date: Mon, 09 Sep 2013 07:01:51 GMT
Content-Type: application/java-archive
Connection: keep-alive
Content-Length: 22553
X-Powered-By: PHP/5.3.14-1~dotdeb.0
ETag: "e21e49a30bd84a1d042602ba446aceb0"
Last-Modified: Mon, 09 Sep 2013 07:04:00 GMT
Accept-Ranges: bytes
200 OK
Length: 22553 (22K) [application/java-archive]
Saving to: `java1.jar'
2013-09-09 16:05:27 (70.8 KB/s) - `java1.jar' saved [22553/22553]
As I expected, the low detection in VT -->LINK
SHA256: 20811157e12152bd262710b5b743ddf60857c3cd157e4f64ea2e6f4fd8ee8eaf
SHA1:  370acfc6bf26d9e4761586cc634382a517e4baaf
MD5:  e21e49a30bd84a1d042602ba446aceb0
File size:  22.0 KB ( 22553 bytes )
File name:  java1.jar
File type:  ZIP
Detection ratio:  4 / 47
Analysis date:  2013-09-09 07:22:06 UTC ( 0 minutes ago ) 

Kaspersky           UDS:DangerousObject.Multi.Generic 
McAfee              Suspect-BO!Exploit-JAR
McAfee-GW-Ed.       Suspect-BO!Exploit-JAR 
Sophos              Mal/ExpJava-U 
Had my fun in decompiling this jar by facing the error below:

Yes it suppose to prevent decompilation, see this reference--> HERE, to make me bumping into the interesting concept of applet loading within Main.class:

Shortly, some hours in manual decoding to solve the strings one by one, I burped the below strings to confirm this jar as CVE-2013-0422, your reference is -->HERE
↑this is at least what I fetch via my method, there could be more others jar with other CVE too. I must say some comments up to this moment as follows, the usage of obfuscation method of the jar is also not a commonly I saw, loading applet object from a class, the anti-debugging fnction, the horrible obfuscation. Without pcap that help guided me testing some result I don't think I can manage to crack this one in such a short time..

Anyway, the post is long, so let's move on: To the deeper more disappointment is, this is all only to burp this a very well known fake adobe url below :-/ - sorry, I can't expose more than this at the moment.

[domain][root-dir] /adobe/update_flash_player .exe 

The Payload Story

Fetching the first level payload, it was tricky effort. Forget the URLqery tricks, doesn't work that way. You must follow the route of infection I described above well to put the correct parameter to fetch this payload, then you will get this:

GET /adobe/update_flash_player.exe HTTP/1.0
HTTP request sent, awaiting response...
HTTP/1.1 200 OK
Server: nginx/0.7.67
Date: Mon, 09 Sep 2013 07:27:08 GMT
Content-Type: application/octet-stream
Connection: keep-alive
Content-Length: 115712
Last-Modified: Mon, 09 Sep 2013 07:25:01 GMT
Accept-Ranges: bytes
200 OK
Length: 115712 (113K) [application/octet-stream]
Saving to: `update_flash_player.exe'
2013-09-09 16:31:12 (3.99 KB/s) - `update_flash_player.exe' saved [115712/115712]
The payload is the Trojan PWS Win32/Fareit, and by reversing method we can figure URL of what other malware to be downloaded by this trojan:
And posting the infected PC's data into the below panels:
↑Please see the above domains well. We have the well-known findings of fake adobe updater served in these urls way beforehand:
mickmicheyl .biz/chrome
mickmicheyl .biz/adobe
mickmicheyl .ca/chrome
mickmicheyl .ca/adobe
mickmicheyl .com/chrome
mickmicheyl .com/adobe
luxurybrandswalla .com/chrome
luxurybrandswalla .com/adobe
The HTTP header used for download is this template:
Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/5.0)
GET %s HTTP/1.0
Host: %s
Accept-Language: en-US
Accept: */*
Accept-Encoding: identity, *;q=0
Connection: close
User-Agent: %s
and the POST command is using this template:
Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/5.0)
POST %s HTTP/1.0
Host: %s
Accept: */*
Accept-Encoding: identity, *;q=0
Accept-Language: en-US
Content-Length: %lu
Content-Type: application/octet-stream
Connection: close
Content-Encoding: binary
User-Agent: %s
The Virus Total scan result of this payload: -->LINK
SHA256: 87470e30daee6c01abc7c6f5411356dad1350db215b856e69d78cd728bc28458
SHA1:  1c6780add9bfda83bafbfa349ddc91d4eb709a51
MD5:  117efa2ab14ef1623b7889a4bb9100e3
File size:  113.0 KB ( 115712 bytes )
File name:  sample
File type:  Win32 EXE
Tags:  peexe
Detection ratio:  11 / 47
Analysis date:  2013-09-09 07:36:47 UTC ( 11 minutes ago ) 

BitDefender           Gen:Variant.Zusy.60090 
Comodo                Heur.Packed.Unknown 
Emsisoft              Gen:Variant.Zusy.60090 (B) 
F-Secure              Gen:Variant.Zusy.60090 
Fortinet              W32/Kryptik.BDPK!tr 
GData                 Gen:Variant.Zusy.60090 
Malwarebytes          Trojan.FavLock 
McAfee                BackDoor-FBFW!117EFA2AB14E 
McAfee-GW-Ed.         Heuristic.LooksLike.Win32.Suspicious.B 
eScan                 Gen:Variant.Zusy.60090 
Symantec              Suspicious.Cloud.5 
↑None of the result said Fareit...You can see the more details of this trojan in my previos post-->HERE and HERE.

Below is the PoC in PCAP about the downloaded and posted URLs:

Second payloads: Gameover & Medfos..

These are the second level payloads:

So what are these payloads?
There are two types of secondary payloads there, the blue icon ones is peer-to-peer ZeuS variant, the Gameover. And the one with the exclamation icon is Win32/Medfos, I uploaded them both in Virus Total as per below report:

Trojan Zeus P2P Variant/Gameover -->LINK

SHA256: be256dc175599524fa65bcf7263de3065658a86ee21184b59671a3c0fd9b05f1
SHA1:  22f2bd96982e479236d81dc0487ab755b57f26c7
MD5:  acab07b3eb59a7b2e9ee66f1eef7e761
File size:  297.0 KB ( 304128 bytes )
File name:  edebk.exe
File type:  Win32 EXE
Detection ratio:  6 / 46
Analysis date:  2013-09-09 08:52:22 UTC ( 0 minutes ago ) 

Fortinet           W32/Kryptik.BDPK!tr 
Malwarebytes       Trojan.FavLock
McAfee             FakeSecTool-FAZ!ACAB07B3EB59 
McAfee-GW-Edition  Heuristic.LooksLike.Win32.Suspicious.B 
Symantec           Suspicious.Cloud.5 
VIPRE              Trojan.Win32.Winwebsec.ia (v) 
↑and none of the above mention the ZeuS/Gameover. Below is the P2P's PoC:

Trojan downloader Win32/Medfos: -->LINK

SHA256: 5baf297dc80f807182b46b189e9df87d5397f728ba93758ac68ece59355cfdba
SHA1:  13bc3d1c1a24e4e0c4753d0bd83c10c783609614
MD5:  d9a50ae2c4bed7a59d8bed0c1320a068
File size:  210.5 KB ( 215552 bytes )
File name:  ucUMruv.exe
File type:  Win32 EXE
Detection ratio:  6 / 47
Analysis date:  2013-09-09 08:18:58 UTC ( 39 minutes ago ) 

ByteHero           Trojan.Malware.Obscu.Gen.002 
Comodo             MalCrypt.Indus! 
Fortinet           W32/Medfos.IOE 
Malwarebytes       Trojan.Medfos.RRE 
Norman             Medfos.JMP 
VBA32              SScope.Trojan.Midhos.2513 
↑four of six products is doing a good work in detecng this Win32/Medfos Trojan Downloader.

The mistery of the third level of payload

The medfos is trying to fetch the third level of payloads from some URLs i.e.:
Method: HTTP/1.1 GET
URL: GET /uploading/id=1083243553&u=4WSbvjA+sJYdbjvNmxr6tWHxLtArmTtrSHvRwRLcacviRtnYIg2xc6QMAWYaZM4RqxalcusDRHEPVjzpf+v2xg==
Too bad (which is a good news indeed!) the file was removed↓


As always, a share for research purpose & raising the detection ratio:

Please mention to @malwaremustdie for password.

Hall of Fame

I thank my friends who stick together in course than we are doing. Thank you ‏@Malwageddon for the solid teamwork, @markusg for the advice & hints. @DhiaLite for introducing us to a new good useful tool, to @ConradLongmore for quick reference to I can confirm the findings, for all OP-kelihos team members.. you guys rocks! At @sempersecurus for the great patience, and all #MalwareMustDie team & friends for standing still side by side in battling malware together. To Umbrella Security Graph for the chance to use the good tool, link-->HERE


In the end, this malicious campaign using the the political situation itself is already bad enough, we think of the an-usual scheme judging by the well-made spam template..all payloads are very low detection ratio.. medfos backends for the third infection layer from file uploader service..and it stings us to the short term of event.
We hope that US and Russia political heat will cool down soon. The more heat raise, the more similar news/event come with more worst malware infection chances that those scums will use to hit our innocent victims..

Latest findings, same threat variants (players?)