Analysis by: John Anthony Banes

ALIASES:

Trojan.Maljava (Norton); Trojan.Java.Agent.ht (Kaspersky); Adwind.ab (NAI)

 PLATFORM:

Windows

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

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

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

It executes commands from a remote malicious user, effectively compromising the affected system. It connects to a website to send and receive information.

It gathers information and reports it to its servers.

  TECHNICAL DETAILS

File Size: 272,997 bytes
File Type: JAR
Memory Resident: Yes
Initial Samples Received Date: 03 Feb 2017
Payload: Connects to URLs/IPs, Steals information

Arrival Details

This backdoor 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 backdoor drops the following files:

  • %User Temp%\m1487914{random numbers}.tmp
  • %User Profile%\zNzxfluTvQW\ID.txt
  • %Application Data%\Oracle\{copy of the files under Java Installation folder}
  • %System%\test.txt
  • %User Temp%\hsperfdata_{username}\{random numbers}

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.. %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.. %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

It drops and executes the following files:

  • %User Temp%\Retrive{random numbers}.vbs - queries machine's installed antivirus and firewall software
  • %User Temp%\{random}.reg - modifies registry entries

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

It drops the following copies of itself into the affected system:

  • %User Profile%\zNzxfluTvQW\ObLlcoxrtyx.jfboin
  • %User Temp%\MCNKJHGGFFF{random numbers}.JAR

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.. %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

Autostart Technique

This backdoor adds the following registry entries to enable its automatic execution at every system startup:

HKCU\Software\Microsoft\
Windows\CurrentVersion\Run
ebodSkeoTlV = "%Application Data%\Oracle\bin\javaw.exe" -jar "%User Profile%\zNzxfluTvQW\ObLlcoxrtyx.jfboin"

HKCU\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
REalTechInfo = "java -jar "%User Temp%\MCNKJHGGFFF{random numbers}.JAR istmp""

Backdoor Routine

This backdoor executes the following commands from a remote malicious user:

  • Download Plug-ins
  • Download and Execute Files
  • Update itself
  • Uninstall itself
  • Reset Connection

It connects to the following websites to send and receive information:

  • {BLOCKED}.{BLOCKED}.126.138:2888

Other Details

This backdoor gathers the following information and reports it to its servers:

  • Local IP
  • Mac Address
  • Size of RAM
  • Country
  • OS Name
  • OS Version
  • If User is Admin
  • Java Version

NOTES:

It disables the following programs and antivirus-related applications by adding the following registry entries:

  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
  • Windows NT\CurrentVersion\Image File Execution Options\{application}
  • Debugger = "svchost.exe"

The registry key value {application} can be any of the following:

  • acs.exe
  • AdAwareDesktop.exe
  • AdAwareService.exe
  • AdAwareTray.exe
  • AgentSvc.exe
  • av_task.exe
  • AVK.exe
  • AVKProxy.exe
  • AVKService.exe
  • AVKTray.exe
  • AVKWCtlx64.exe
  • avpmapp.exe
  • Bav.exe
  • bavhm.exe
  • BavSvc.exe
  • BavTray.exe
  • BavUpdater.exe
  • BavWebClient.exe
  • BDSSVC.exe
  • BgScan.exe
  • BullGuard.exe
  • BullGuardBhvScanner.exe
  • BullGuardUpdate.exe
  • BullGuarScanner.exe
  • capinfos.exe
  • cavwp.exe
  • CertReg.exe
  • cis.exe
  • CisTray.exe
  • clamscan.exe
  • ClamTray.exe
  • ClamWin.exe
  • cmdagent.exe
  • ConfigSecurityPolicy.exe
  • CONSCTLX.exe
  • coreFrameworkHost.exe
  • coreServiceShell.exe
  • dragon_updater.exe
  • dumpcap.exe
  • econceal.exe
  • econser.exe
  • editcap.exe
  • EMLPROXY.exe
  • escanmon.exe
  • escanpro.exe
  • fcappdb.exe
  • FCDBlog.exe
  • FCHelper64.exe
  • FilMsg.exe
  • FilUp.exe
  • filwscc.exe
  • fmon.exe
  • FortiClient.exe
  • FortiClient_Diagnostic_Tool.exe
  • FortiESNAC.exe
  • FortiFW.exe
  • FortiProxy.exe
  • FortiSSLVPNdaemon.exe
  • FortiTray.exe
  • FPAVServer.exe
  • FProtTray.exe
  • FPWin.exe
  • freshclam.exe
  • freshclamwrap.exe
  • fsgk32.exe
  • FSHDLL64.exe
  • fshoster32.exe
  • FSM32.exe
  • FSMA32.exe
  • fsorsp.exe
  • fssm32.exe
  • GdBgInx64.exe
  • GDKBFltExe32.exe
  • GDSC.exe
  • GDScan.exe
  • guardxkickoff_x64.exe
  • guardxservice.exe
  • iptray.exe
  • K7AVScan.exe
  • K7CrvSvc.exe
  • K7EmlPxy.exe
  • K7FWSrvc.exe
  • K7PSSrvc.exe
  • K7RTScan.exe
  • K7SysMon.exe
  • K7TSecurity.exe
  • K7TSMain.exe
  • K7TSMngr.exe
  • LittleHook.exe
  • mbam.exe
  • mbamscheduler.exe
  • mbamservice.exe
  • MCShieldCCC.exe
  • MCShieldDS.exe
  • MCShieldRTM.exe
  • MCS-Uninstall.exe
  • mergecap.exe
  • MpCmdRun.exe
  • MpUXSrv.exe
  • MSASCui.exe
  • MsMpEng.exe
  • MWAGENT.exe
  • MWASER.exe
  • nanoav.exe
  • nanosvc.exe
  • nbrowser.exe
  • nfservice.exe
  • NisSrv.exe
  • njeeves2.exe
  • nnf.exe
  • nprosec.exe
  • NS.exe
  • nseupdatesvc.exe
  • nvcod.exe
  • nvcsvc.exe
  • nvoy.exe
  • nwscmon.exe
  • ONLINENT.exe
  • op_mon.exe
  • OPSSVC.exe
  • ProcessHacker.exe
  • procexp.exe
  • PSANHost.exe
  • PSUAMain.exe
  • PSUAService.exe
  • psview.exe
  • PtSessionAgent.exe
  • PtSvcHost.exe
  • PtWatchDog.exe
  • quamgr.exe
  • QUHLPSVC.exe
  • rawshark.exe
  • SAPISSVC.exe
  • SASCore64.exe
  • SASTask.exe
  • SBAMSvc.exe
  • SBAMTray.exe
  • SBPIMSvc.exe
  • SCANNER.exe
  • SCANWSCS.exe
  • schmgr.exe
  • scproxysrv.exe
  • ScSecSvc.exe
  • SDFSSvc.exe
  • SDScan.exe
  • SDTray.exe
  • SDWelcome.exe
  • SSUpdate64.exe
  • SUPERAntiSpyware.exe
  • SUPERDelete.exe
  • text2pcap.exe
  • TRAYICOS.exe
  • TRAYSSER.exe
  • trigger.exe
  • tshark.exe
  • twsscan.exe
  • twssrv.exe
  • uiSeAgnt.exe
  • uiUpdateTray.exe
  • uiWatchDog.exe
  • uiWinMgr.exe
  • UnThreat.exe
  • UserReg.exe
  • utsvc.exe
  • V3Main.exe
  • V3Medic.exe
  • V3Proxy.exe
  • V3SP.exe
  • V3Svc.exe
  • V3Up.exe
  • VIEWTCP.exe
  • VIPREUI.exe
  • virusutilities.exe
  • WebCompanion.exe
  • wireshark.exe
  • Zanda.exe
  • Zlh.exe
  • zlhh.exe

It also terminates the applications listed above using this command, taskkill /IM {Application} /T /F.

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 13.196.08
FIRST VSAPI PATTERN DATE: 02 Feb 2017
VSAPI OPR PATTERN File: 13.197.00
VSAPI OPR PATTERN Date: 03 Feb 2017

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

 
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • ebodSkeoTlV = "%Application Data%\Oracle\bin\javaw.exe" -jar "%User Profile%\zNzxfluTvQW\ObLlcoxrtyx.jfboin"
  • In HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • REalTechInfo = "java -jar "%User Temp%\MCNKJHGGFFF{random numbers}.JAR istmp""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\{application}
    • Debugger = "svchost.exe"

Step 5

Search and delete these folders

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %User Profile%\zNzxfluTvQW
  • %Application Data%\Oracle
  • %User Temp%\hsperfdata_{username}

Step 6

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.
  • %User Temp%\m1487914{random numbers}.tmp
  • %System%\test.txt
  • %User Temp%\Retrive{random numbers}.vbs
  • %User Temp%\{random}.reg

Step 7

Restart in normal mode and scan your computer with your Trend Micro product for files detected as JAVA_ADWIND.AUSTB . 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.


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