Analysis by: Rheniel Rhay Ramos

 ALIASES:

HEUR:Trojan-Spy.OSX.Aptordoc.b (Kaspersky) MacOS:Dok-D [Trj] (Avast)

 PLATFORM:

Mac OS X

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel: Downloaded from the Internet, Dropped by other malware

This malware abuses certificates and has security software evasion that affects machines using Apple's OS X operating system. The fake certificates installed by the malware allows for man in the middle attacks. The malware is also known to target financial institutions.

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It modifies the affected system's HOSTS files. This prevents users from accessing certain websites.

  TECHNICAL DETAILS

File Size: 38,864 bytes
File Type: Mach-O
Memory Resident: Yes
Initial Samples Received Date: 26 May 2017
Payload: Displays graphics/image

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This Trojan drops the following copies of itself into the affected system and executes them:

  • /Users/Shared/AppStore.app

HOSTS File Modification

This Trojan modifies the affected system's HOSTS files to prevent a user from accessing the following websites:

  • 127.0.0.1 localhost
  • 255.255.255.255 broadcasthost
  • ::1 localhost
  • 127.0.0.1 metrics.apple.com
  • 127.0.0.1 ocsp.apple.com
  • 127.0.0.1 su.itunes.apple.com
  • 127.0.0.1 ax.su.itunes.apple.com
  • 127.0.0.1 swscan.apple.com
  • 127.0.0.1 swcdn.apple.com
  • 127.0.0.1 swdist.apple.com
  • 127.0.0.1 a1.phobos.apple.com
  • 127.0.0.1 a101.phobos.apple.com
  • 127.0.0.1 a102.phobos.apple.com
  • 127.0.0.1 a103.phobos.apple.com
  • 127.0.0.1 a104.phobos.apple.com
  • 127.0.0.1 a105.phobos.apple.com
  • 127.0.0.1 a11.phobos.apple.com
  • 127.0.0.1 a12.phobos.apple.com
  • 127.0.0.1 a13.phobos.apple.com
  • 127.0.0.1 a14.phobos.apple.com
  • 127.0.0.1 a15.phobos.apple.com
  • 127.0.0.1 access.apple.com
  • 127.0.0.1 advertising.apple.com
  • 127.0.0.1 albert.apple.com
  • 127.0.0.1 ali.apple.com
  • 127.0.0.1 ams.apple.com
  • 127.0.0.1 apple.apple.com
  • 127.0.0.1 apple.com
  • 127.0.0.1 appleconnect.apple.com
  • 127.0.0.1 appleid-it.apple.com
  • 127.0.0.1 appleid.apple.com
  • 127.0.0.1 appleseed.apple.com
  • 127.0.0.1 appleseed3.apple.com
  • 127.0.0.1 appleseedtest.apple.com
  • 127.0.0.1 aps.info.apple.com
  • 127.0.0.1 ara.apple.com
  • 127.0.0.1 arait.apple.com
  • 127.0.0.1 asia.apple.com
  • 127.0.0.1 asw.apple.com
  • 127.0.0.1 atlaslms.apple.com
  • 127.0.0.1 av.apple.com
  • 127.0.0.1 benefits.apple.com
  • 127.0.0.1 beta.apple.com
  • 127.0.0.1 bugreport.apple.com
  • 127.0.0.1 bugreporter.apple.com
  • 127.0.0.1 c.apple.com
  • 127.0.0.1 calendar.apple.com
  • 127.0.0.1 certifications-test.apple.com
  • 127.0.0.1 certifications.apple.com
  • 127.0.0.1 certifications2.apple.com
  • 127.0.0.1 checkcoverage.apple.com
  • 127.0.0.1 checkrepair.apple.com
  • 127.0.0.1 concierge-mobile.apple.com
  • 127.0.0.1 concierge.apple.com
  • 127.0.0.1 consultants.apple.com
  • 127.0.0.1 cooljobs.apple.com
  • 127.0.0.1 deimos.apple.com
  • 127.0.0.1 deimos2.apple.com
  • 127.0.0.1 deimos3.apple.com
  • 127.0.0.1 deploy.apple.com
  • 127.0.0.1 developer.apple.com
  • 127.0.0.1 developer2.apple.com
  • 127.0.0.1 developertest.apple.com
  • 127.0.0.1 devforums.apple.com
  • 127.0.0.1 devimages.apple.com
  • 127.0.0.1 diagnostics.apple.com
  • 127.0.0.1 discussions.apple.com
  • 127.0.0.1 documentation.apple.com
  • 127.0.0.1 downloads.apple.com
  • 127.0.0.1 ecommerce.apple.com
  • 127.0.0.1 employment.apple.com
  • 127.0.0.1 enterprise.apple.com
  • 127.0.0.1 ep.sap.apple.com
  • 127.0.0.1 erp.apple.com
  • 127.0.0.1 esp-test.apple.com
  • 127.0.0.1 esp.apple.com
  • 127.0.0.1 euro.apple.com
  • 127.0.0.1 events.apple.com
  • 127.0.0.1 ext.apple.com
  • 127.0.0.1 ext1.apple.com
  • 127.0.0.1 extensions.apple.com
  • 127.0.0.1 files.apple.com
  • 127.0.0.1 gspa21.ls.apple.com
  • 127.0.0.1 gsx-it.apple.com
  • 127.0.0.1 gsx.apple.com
  • 127.0.0.1 gsxit.apple.com
  • 127.0.0.1 guide.apple.com
  • 127.0.0.1 help.apple.com
  • 127.0.0.1 hrweb.apple.com
  • 127.0.0.1 iad.apple.com
  • 127.0.0.1 iadworkbench.apple.com
  • 127.0.0.1 id.apple.com
  • 127.0.0.1 identity.apple.com
  • 127.0.0.1 iforgot.apple.com
  • 127.0.0.1 images.apple.com
  • 127.0.0.1 index.apple.com
  • 127.0.0.1 init.apple.com
  • 127.0.0.1 investor.apple.com
  • 127.0.0.1 iphone.apple.com
  • 127.0.0.1 itunes.apple.com
  • 127.0.0.1 itunespartner.apple.com
  • 127.0.0.1 jobs.apple.com
  • 127.0.0.1 k.apple.com
  • 127.0.0.1 lists.apple.com
  • 127.0.0.1 locate.apple.com
  • 127.0.0.1 macos.apple.com
  • 127.0.0.1 manuals.info.apple.com
  • 127.0.0.1 manuals01.info.apple.com
  • 127.0.0.1 manuals02.info.apple.com
  • 127.0.0.1 manuals03.info.apple.com
  • 127.0.0.1 manuals04.info.apple.com
  • 127.0.0.1 maps.apple.com
  • 127.0.0.1 mapsconnect.apple.com
  • 127.0.0.1 meetingroom.apple.com
  • 127.0.0.1 mfi.apple.com
  • 127.0.0.1 mobile.apple.com
  • 127.0.0.1 mobileaccess.apple.com
  • 127.0.0.1 movies.apple.com
  • 127.0.0.1 movietrailers.apple.com
  • 127.0.0.1 myaccess-it.apple.com
  • 127.0.0.1 myaccess.apple.com
  • 127.0.0.1 mynews.apple.com
  • 127.0.0.1 mystore.apple.com
  • 127.0.0.1 news.apple.com
  • 127.0.0.1 nr.apple.com
  • 127.0.0.1 opensource.apple.com
  • 127.0.0.1 podcastsconnect.apple.com
  • 127.0.0.1 portal.apple.com
  • 127.0.0.1 quicktime.apple.com
  • 127.0.0.1 radar.apple.com
  • 127.0.0.1 register.apple.com
  • 127.0.0.1 relay.apple.com
  • 127.0.0.1 relay1.apple.com
  • 127.0.0.1 relay11.apple.com
  • 127.0.0.1 relay12.apple.com
  • 127.0.0.1 relay13.apple.com
  • 127.0.0.1 relay14.apple.com
  • 127.0.0.1 relay15.apple.com
  • 127.0.0.1 relay2.apple.com
  • 127.0.0.1 relay3.apple.com
  • 127.0.0.1 relay4.apple.com
  • 127.0.0.1 relay5.apple.com
  • 127.0.0.1 remoteadvisor.apple.com
  • 127.0.0.1 remoteadvisor1.apple.com
  • 127.0.0.1 remoteadvisor2.apple.com
  • 127.0.0.1 reportaproblem.apple.com
  • 127.0.0.1 s.apple.com
  • 127.0.0.1 safari-extensions.apple.com
  • 127.0.0.1 sales.apple.com
  • 127.0.0.1 salesresources.apple.com
  • 127.0.0.1 school.apple.com
  • 127.0.0.1 selfsolve.apple.com
  • 127.0.0.1 servers.apple.com
  • 127.0.0.1 service.apple.com
  • 127.0.0.1 sift.apple.com
  • 127.0.0.1 signin.apple.com
  • 127.0.0.1 signin.info.apple.com
  • 127.0.0.1 source.apple.com
  • 127.0.0.1 ssl.apple.com
  • 127.0.0.1 sso.apple.com
  • 127.0.0.1 store.apple.com
  • 127.0.0.1 support.apple.com
  • 127.0.0.1 support01.apple.com
  • 127.0.0.1 support02.apple.com
  • 127.0.0.1 support03.apple.com
  • 127.0.0.1 support04.apple.com
  • 127.0.0.1 support05.apple.com
  • 127.0.0.1 supportprofile.apple.com
  • 127.0.0.1 supporttest.apple.com
  • 127.0.0.1 survey.apple.com
  • 127.0.0.1 survey2.apple.com
  • 127.0.0.1 swdlp.apple.com
  • 127.0.0.1 time.apple.com
  • 127.0.0.1 time1.apple.com
  • 127.0.0.1 time2.apple.com
  • 127.0.0.1 time3.apple.com
  • 127.0.0.1 time4.apple.com
  • 127.0.0.1 time5.apple.com
  • 127.0.0.1 tips.apple.com
  • 127.0.0.1 trailers.apple.com
  • 127.0.0.1 training.apple.com
  • 127.0.0.1 trainingevents.apple.com
  • 127.0.0.1 uptodate.apple.com
  • 127.0.0.1 volume.apple.com
  • 127.0.0.1 war.apple.com
  • 127.0.0.1 www1.apple.com
  • 127.0.0.1 wwwtest.apple.com
  • 127.0.0.1 xml.apple.com
  • 127.0.0.1 xp.apple.com
  • 127.0.0.1 xp2.apple.com
  • 127.0.0.1 virustotal.com
  • 127.0.0.1 www.virustotal.com

Other Details

This Trojan connects to the following URL(s) to get the affected system's IP address:

  • api.ipify.org

It does the following:

  • It installs fake certificates without notifying the user.
  • It terminates the following browsers:
    • Safari
    • Firefox
    • Google Chrome
  • It disables system updates.
  • It installs the following in the affected system:
    • brew
    • tor
    • socat
  • It contains a list of its targeted financial institutions :
    • *.cic.ch
    • *.clientis.ch
    • *.postfinance.ch
    • *.ukb.ch
    • *.urkb.ch
    • *abs ch
    • *acrevis.ch
    • *aekbank.ch
    • *akb.ch
    • *alpharheintalbank.ch
    • *apbank.ch
    • *appkb.ch
    • *arabbank.ch
    • *baloise.ch
    • *bancasempione.ch
    • *bancazarattini.ch
    • *bankbiz.ch
    • *bankgantrisch.ch
    • *bankhaus-jungholz.ch
    • *bankleerau.ch
    • *bankslm.ch
    • *bankzimmerberg.ch
    • *banquecramer.ch
    • *banqueduleman.ch
    • *banquethaler.com
    • *bbobank.ch
    • *bbva.ch
    • *bcf.ch
    • *bcge.ch
    • *bcj.ch
    • *bcn.ch
    • *bcpconnect.com
    • *bcv.ch
    • *bcvs.ch
    • *bekb.ch
    • *bil.com
    • *bkb.chs
    • *blkb.ch
    • *bnpparibas.com
    • *bordier.com
    • *bsibank.com
    • *btv3banken.ch
    • *ca-financements.ch
    • *cash.ch
    • *cbhbank.com
    • *ce-riviera.ch
    • *ceanet.ch
    • *cedc.ch
    • *cembra.ch
    • *cen.ch
    • *cimbanque.net
    • *cmvsa.ch
    • *commerzbank.com
    • *corneronline.ch
    • *coutts.com
    • *credinvest.ch
    • *credit-suisse.com
    • *dcbank.ch
    • *dominickco.ch
    • *eek.ch
    • *efginternational.com
    • *ekaffoltern.ch
    • *eki.ch
    • *ekr.ch
    • *ersparniskasse.ch
    • *exane.com
    • *falconpb.com
    • *frankfurter-bankgesellschaft.com
    • *gemeinschaftsbank.ch
    • *gkb.ch
    • *glarner-regionalbank.ch
    • *glkb.ch
    • *globalance-bank.com
    • *gobanking.ch
    • *hbl.ch
    • *hsbcprivatebank.com
    • *hypobank.ch
    • *incorebank.ch
    • *inlinea.ch
    • *juliusbaer.com
    • *leihkasse-stammheim.ch
    • *lienhardt.ch
    • *lukb.ch
    • *maerki-baumann.ch
    • *mirabaud.com
    • *mmwarburg.ch
    • *mybancaria.ch
    • *neuehelvetischebank.ch
    • *nkb.ch
    • *nordea.ch
    • *notenstein-laroche.ch
    • *onba.ch
    • *owkb.ch
    • *pbgate.net
    • *pbihag.ch
    • *piguetgalland.ch
    • *rahnbodmer.ch
    • *raiffeisen.chs
    • *rbm.ch
    • *regiobank.ch
    • *reyl.com
    • *saanenbank.ch
    • *sebgroup.com
    • *shkb.ch
    • *slbucheggberg.ch
    • *slfrutigen.ch
    • *slguerbetal.ch
    • *slr.ch
    • *slwynigen.ch
    • *sparhafen.ch
    • *sparkasse-dielsdorf.ch
    • *sparkasse.ch
    • *szkb.ch
    • *trafina.ch
    • *triba.ch
    • *ubp.com
    • *ubs.com
    • *umtb.ch
    • *valiant.ch
    • *vermoegenszentrum.ch
    • *vontobel.com
    • *wir.ch
    • *zkb.ch
    • *zuercherlandbank.ch
    • *zugerkb.ch
    • bankthalwil.ch
    • bernerlandb. nk.ch
    • cic.ch
    • clientis.ch
    • cs.directnet.com
    • ebanking.raiffeisen.ch
    • tb.raiffeiendirect.ch
    • ukb.ch
    • urkb.ch
  • It adds itself to the macOS Login Items named "AppStore"
  • It installs the following files in the user's Launch Agents folder to redirect HTTP and HTTPS traffic:
    • com.apple.Safari.pac.plist
    • com.apple.Safari.proxy.plist
  • It removes the system AppStore and opens a fake OSX update screen.

NOTES:
It displays the following fake system update application:

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 13.466.08
FIRST VSAPI PATTERN DATE: 12 Jun 2017
VSAPI OPR PATTERN File: 13.467.00
VSAPI OPR PATTERN Date: 13 Jun 2017

Step 1

Search and delete these files

[ Learn More ]
There may be some files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
  • /Users/YOUR USERNAME/Library/LaunchAgents/com.apple.Safari.proxy.plist
  • /Users/YOUR USERNAME/Library/LaunchAgents/com.apple.Safari.pac.plist

Step 2

Scan your computer with your Trend Micro product to delete files detected as OSX_DOK.C. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.

NOTES:
Solution: Remove these strings added by the malware/grayware/spyware in the HOSTS file

[ Learn More ]

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