WORM_JORIK.MJSM

This worm arrives via removable drives. It 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 then deletes itself afterward.

It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.

Arrival Details

This worm arrives via removable drives.

It may arrive via network shares.

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

• %System%\{random}.exe

(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)

It executes then deletes itself afterward.

It adds the following mutexes to ensure that only one of its copies runs at any one time:

• V8x
• muipcdraotse

It injects threads into the following normal process(es):

• explorer.exe

It terminates itself if it finds the following processes in the affected system's memory:

• port
• vbox
• vmsrvc
• vmware
• sandbox
• tcpview
• wireshark.exe
• regshot.exe
• procmon.exe
• filemon.exe
• procmon.exe
• regmon.exe
• procdump.exe
• cports.exe
• procexp.exe
• squid.exe
• dumpcap.exe

Autostart Technique

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

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Run
Intel Display Controler = "%System%\{random}.exe"

Other System Modifications

This worm also creates the following registry entry(ies) as part of its installation routine:

HKLM\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\AppCompatFlags\
Layers
DisableNXShowUI = "%System%\{random}.exe"

Propagation

This worm drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.

Process Termination

This worm terminates the following services if found on the affected system:

• SIScanner
• K7RTScan
• K7TSMngr
• DrWebEngine
• SPIDERNT
• DrWebCom
• avast! Antivirus
• avast! Firewall
• AntiVirService
• VSSERV
• avgfws
• avgwd
• avg8wd
• avg9wd
• NOD32krn
• ekrn
• mcmscsvc
• McShield
• MSK80Service
• McNASvc
• MpfService
• McODS
• MpfService
• McSysmon
• SmcService
• Symantec AntiVirus
• Norton Antivirus Server
• MBAMProtector
• MBAMService
• WebrootSpySweeperService
• WRConsumerService
• Amsp
• SAVService
• SAVAdminService
• Sophos AutoUpdate Service
• Sophos Client Firewall
• Sophos Client Firewall Manager
• OutpostFirewall
• TMBMServer
• TmPfw
• KPF4
• cmdAgent
• SbPF.Launcher
• SPF4
• acssrv

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

• TEATIMER.EXE
• MRT.EXE
• MRTSTUB.EXE
• TCPVIEW.EXE
• HIJACKTHIS.EXE
• MSMPENG.EXE
• MSASCUI.EXE
• MPCMDRUN.EXE
• USBGUARD.EXE
• BILLY.EXE
• AADRIVE32.EXE

NOTES:

It terminates itself if any of the following conditions are satisfied:

• If the malware path contains any of the following:
  
  sample
  sand-box
  sandbox
  test
  virus
• This malware checks if it is running on a virutal machine. It terminates itself if the data in the registry entry HKLM\SYSTEM\ControlSet001\Services\Disk\Enum\0 contains any of the following strings:
  
  QEMU
  VBox
  Virtual
  VMware
• If an open window has any of the following ClassName, WindowName pairs:
  
  gdkWindowToplevel, The Wireshark Network Analyzer
  CNetmonMainFrame, Microsoft Network Monitor 3.3
  SmartSniff, SmartSniff
  CurrPorts,CurrPorts
  TCPViewClass, 0
  PROCMON_WINDOW_CLASS, Process Monitor - Sysinternals: www.sysinternals.com
  #32770, Regshot 1.8.2
  PROCEXPL, 0
• If any of the following files exist in the %Program Files% folder:
  
  Ethereal\ethereal.html
  Microsoft Network Monitor 3\netmon.exe
  WinPcap\rpcapd.exe
  WireShark\rawshark.exe

It connects to a remote IRC server where it receives the following commands from a remote malicious user:

• down_exec
• IM
• IMSTOP
• start-scan
• stop-scan
• update
• visit

It is capable of the following routines:

• Create/Open/Delete Files
• Create/Terminate Process
• Download/Upload files
• Join IRC
• Search for other system in Network
• Send Instant Messages