Analysis by: Rheniel Rhay Ramos

ALIASES:

Java.Trojan.Agent.FU (Bitdefender); HEUR:Trojan.Java.Agent.gen (Kaspersky); JV/Backdoor-Adwind.m(McAfee)

 PLATFORM:

Windows

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

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

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 adds certain registry entries to disable the Task Manager. This action prevents users from terminating the malware process, which can usually be done via the Task Manager.

It runs certain commands that it receives remotely from a malicious user. Doing this puts the affected computer and information found on the computer at greater risk. It connects to a website to send and receive information.

It gathers information and reports it to its servers.

  TECHNICAL DETAILS

File Size: 636,560 bytes
File Type: JAR
Memory Resident: No
Initial Samples Received Date: 01 Aug 2017
Payload: Compromises system security, 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 copies of itself into the affected system:

  • %UserProfile%\nYbQTVxcHuE\uiylKSALYJr.Vybgol

It drops the following files:

  • %ProgramData%\Oracle\Java\.oracle_jre_usage\{random name1}.timestamp -> time usage of oracle
  • %System%\test.txt -> used to check for admin rights
  • %User Profile%\fUTkALeaTxM\ID.txt -> contains UUID
  • %User Profile%\nYbQTVxcHuE\ID.txt -> contains UUID
  • %User Temp%\hsperfdata_{username}\{process ID} -> contains details of the malware (2 files)
  • %User Temp%\{random name2}.reg -> contains log of registries modified by the malware
  • %User Temp%\Retrive{random numbers}.vbs -> script to detect installed AV security and Firewall products (deleted after execution) (4 files)

(Note: %ProgramData% is the Program Data folder, where it usually is C:\Program Files in Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\ProgramData in 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.. %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.)

It drops and executes the following files:

  • %User Temp%\0.{random numbers}.class -> class to be loaded by main executable JAR

(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 adds the following processes:

  • %ProgramData%\Oracle\Java\jre1.8.0_144\bin\java.exe
  • %ProgramData%\Oracle\Java\jre1.8.0_144\bin\javaw.exe
  • %System%\taskkill.exe /IM {process name} /T /F -> where {process name} could be one of the following processes terminated by the malware
  • %System%\xcopy "%Program Files%\Java\jre{version}" "%Application Data%\Oracle\" /e -> copy files and directory trees of Java Installation folder to %Application Data%\Oracle folder

(Note: %ProgramData% is the Program Data folder, where it usually is C:\Program Files in Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\ProgramData in 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.. %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.)

It creates the following folders:

  • %Application Data%\Oracle
  • %User Profile%\fUTkALeaTxM
  • %User Profile%\fUTkALeaTxM\DdWDtpinxpf -> plugin folder
  • %User Profile%\nYbQTVxcHuE
  • %User Temp%\hsperfdata_{User Name}

(Note: %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.. %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:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
WLyQyhWoosi = ""%Application Data%\Oracle\bin\javaw.exe" -jar "%UserProfile%\nYbQTVxcHuE\uiylKSALYJr.Vybgol""

Other System Modifications

This Backdoor adds the following registry entries as part of its installation routine:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
{process name}
debugger = "svchost.exe"
where {process name} could be one of the following processes terminated by the malware

It adds the following registry entries to disable the Task Manager:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
System
DisableTaskMgr = "2"

Backdoor Routine

This Backdoor executes the following command(s) from a remote malicious user:

  • Download Plug-ins
  • Download and Execute Files
  • Update itself
  • Uninstall itself
  • Reset Connection
  • Terminate Process
  • Sceen Capture
  • Access Webcam
  • Log Keystrokes

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

  • {BLOCKED}.{BLOCKED}.27.66:1010

Process Termination

This Backdoor terminates the following processes if found running in the affected system's memory:

  • 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
  • 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
  • quamgr.exe
  • QUHLPSVC.EXE
  • Rawshark.exe
  • regedit.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
  • Taskmgr.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
  • UserAccountControlSettings.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

Other Details

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

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

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 13.574.02
FIRST VSAPI PATTERN DATE: 01 Aug 2017
VSAPI OPR PATTERN File: 13.575.00
VSAPI OPR PATTERN Date: 02 Aug 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
    • WLyQyhWoosi = ""%Application Data%\Oracle\bin\javaw.exe" -jar "%UserProfile%\nYbQTVxcHuE\uiylKSALYJr.Vybgol""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\{process name}
    where {process name} could be one of the following processes terminated by the malwar
    • debugger = "svchost.exe"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System
    • DisableTaskMgr = "2"

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.
  • %Application Data%\Oracle
  • %User Profile%\fUTkALeaTxM
  • %User Profile%\fUTkALeaTxM\DdWDtpinxpf
  • %User Profile%\nYbQTVxcHuE
  • %User Temp%\hsperfdata_{User Name}

Step 6

Search and delete this file

[ 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.
  • %System%\test.txt
  • %User Temp%\0.{random numbers}.class
  • %User Temp%\{random name2}.reg

Step 7

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