Technical Information
To ensure autorun and distribution
Modifies the following registry keys
- [HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] 'Backup' = '%HOMEPATH%\BackConfig\BackUp\csrsses.exe'
- [HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] 'BigData' = '%HOMEPATH%\BackConfig\BigData\svchots.exe'
- [HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] 'BigSyn' = '%HOMEPATH%\BackConfig\BigData\lssmp.exe'
- [HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] 'BigSym' = '%HOMEPATH%\BackConfig\BigData\lssms.exe'
- [HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] 'Dataupdate' = '%HOMEPATH%\BackConfig\BigData\kylgr.exe'
Malicious functions
Creates and executes the following (exploit)
- '%APPDATA%\skyep.exe'
Executes the following (exploit)
- '<SYSTEM32>\cmd.exe' /c C:\Skyep\Skyep.bat
- '%CommonProgramFiles%\Microsoft Shared\DW\DW20.EXE' -x -s 1448
Modifies file system
Creates the following files
- %APPDATA%\skyep.exe
- %HOMEPATH%\documents\vbb52f.tmp
- %HOMEPATH%\documents\vbb88d.tmp
- C:\skyep\skyep.txt
- %TEMP%\1030854.cvr
- %HOMEPATH%\backconfig\backup\pcap.txt
- %HOMEPATH%\backconfig\bigdata\pcap.txt
Deletes the following files
- %TEMP%\vbb52e.tmp
- %TEMP%\vbb88c.tmp
- %APPDATA%\skyep.exe
Moves the following files
- from %HOMEPATH%\documents\vbb52f.tmp to %TEMP%\vbb52e.tmp
- from %HOMEPATH%\documents\vbb88d.tmp to %TEMP%\vbb88c.tmp
- from C:\skyep\skyep.txt to C:\skyep\skyep.bat
Network activity
UDP
- DNS ASK da#####.akamaihub.stream
Miscellaneous
Creates and executes the following
- '<SYSTEM32>\cmd.exe' /c C:\Skyep\Skyep.bat' (with hidden window)
Executes the following
- '<SYSTEM32>\attrib.exe' +a +h +s "%HOMEPATH%\BackConfig"
- '<SYSTEM32>\attrib.exe' +a +h +s "%HOMEPATH%\Printers"
- '<SYSTEM32>\reg.exe' delete "HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v BackUp /f
- '<SYSTEM32>\reg.exe' delete "HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v BigData /f
- '<SYSTEM32>\reg.exe' delete "HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v BigSyn /f
- '<SYSTEM32>\reg.exe' delete "HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v BigSym /f
- '<SYSTEM32>\reg.exe' delete "HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v Dataupdate /f
- '<SYSTEM32>\reg.exe' add "HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v Backup /t REG_SZ /d %HOMEPATH%\BackConfig\BackUp\csrsses.exe
- '<SYSTEM32>\reg.exe' add "HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v BigData /t REG_SZ /d %HOMEPATH%\BackConfig\BigData\svchots.exe
- '<SYSTEM32>\reg.exe' add "HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v BigSyn /t REG_SZ /d %HOMEPATH%\BackConfig\BigData\lssmp.exe
- '<SYSTEM32>\reg.exe' add "HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v BigSym /t REG_SZ /d %HOMEPATH%\BackConfig\BigData\lssms.exe
- '<SYSTEM32>\reg.exe' add "HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v Dataupdate /t REG_SZ /d %HOMEPATH%\BackConfig\BigData\kylgr.exe
- '%WINDIR%\syswow64\cmd.exe' /C Del "%APPDATA%\Skyep.exe"
