WORM_REBHIP.DC
Worm:Win32/Rebhip.A(Microsoft), Virus.Win32.VBInject(Ikarus), a variant of Win32/Injector.AZJ trojan(Eset)
Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
Threat Type: Worm
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This worm arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.
TECHNICAL DETAILS
339,968 bytes
EXE
Yes
04 May 2013
Arrival Details
This worm 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 and executes them:
- %System%\install\server.exe
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)
It drops the following files:
- %Application Data%\logs.dat
- %User Temp%\UuU.uUu
- %User Temp%\XxX.xXx
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.. %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)
It creates the following folders:
- %System%\install
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)
Autostart Technique
This worm adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\Run
Policies = "%System%\install\server.exe"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
HKCU = "%System%\install\server.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer\Run
Policies = "%System%\install\server.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
HKLM = "%System%\install\server.exe"
Other System Modifications
This worm adds the following registry keys:
HKEY_CURRENT_USER\Software\Victim
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\Run
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{random}
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer\Run
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Victim
FirstExecution = "{Date of 1st execution} -- {Time of 1st execution}"
HKEY_CURRENT_USER\Software\Victim
NewIdentification = "Victim"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{random}
StubPath = "%System%\install\server.exe"
Propagation
This worm creates the following folders in all removable drives:
- {Drive Letter}:\RECYCLER
- {Drive Letter}:\RECYCLER\S-1-5-21-{random}
It drops the following copy(ies) of itself in all removable drives:
- {Drive Letter}:\RECYCLER\S-1-5-21-{random}\server.exe
It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.
The said .INF file contains the following strings:
[autorun]
;open=RECYCLER\S-1-5-21-{random}\server.exe
icon=shell32.dll,4
shellexecute=RECYCLER\S-1-5-21-{random}\server.exe
label=PENDRIVE
action=Open folder to view files
shell\Open=Open
shell\Open\command=RECYCLER\S-1-5-21-{random}\server.exe
shell\Open\Default=1