WORM_PUSHBOT.CY
Mal/Buzus-GA (Sophos), W32/Injector.HRV!tr (Fortinet), W32/CeeInject.AE.gen!Eldorado (FProt), Trojan.Win32.Menti (Ikarus), Backdoor.Win32.Bifrose.fyb (Kaspersky), VirTool:Win32/CeeInject.gen!FI (Microsoft), a variant of Win32/Injector.HNC trojan (NOD32)
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: Yes
In the wild: Yes
OVERVIEW
Propagates via removable drives
This worm arrives via removable drives.
It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.
It does not have any information-stealing capability.
TECHNICAL DETAILS
99,328 bytes
EXE
Yes
05 Jul 2013
Compromises system security
Arrival Details
This worm arrives via removable drives.
Installation
This worm drops the following copies of itself into the affected system:
- %User Temp%\lsass.exe
(Note: %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 adds the following mutexes to ensure that only one of its copies runs at any one time:
- jiuhuig
It terminates the execution of the copy it initially executed and executes the copy it drops instead.
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\Run
Windows Firewall = "%User Temp%\lsass.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
Windows Firewall = "%User Temp%\lsass.exe"
Propagation
This worm creates the following folders in all removable drives:
- {Removable Drive}:\ TTHDHGC
- {Removable Drive}:\ TTHDHGC\DFG-2352-66235-2352322-634621321-6662355
It drops the following copy(ies) of itself in all removable drives:
- {Removable Drives}:\TTHDHGC\DFG-2352-66235-2352322-634621321-6662355\364855.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=TTHDHGC\DFG-2352-66235-2352322-634621321-6662355\364855.exe
icon=%SystemRoot%\system32\SHELL32.dll,4
action=Open folder to view files
shell\open\command=TTHDHGC\DFG-2352-66235-2352322-634621321-6662355\364855.exe
shell\open\default=1
Backdoor Routine
This worm connects to any of the following IRC server(s):
- irc.{BLOCKED}ol.co.cc
It accesses a remote Internet Relay Chat (IRC) server where it receives the following commands from a remote malicious user:
- Delete itself
- Kill Specific Processes
- Establish New IRC Connection
- Download and Execute Adware
- Propagate via MSN
- Propagate via Torrent
- Update itself
Dropping Routine
This worm sets the attributes of its dropped file(s) to the following:
- Read Only
- Hidden
- System
Information Theft
This worm does not have any information-stealing capability.
Other Details
This worm uses the following credentials when accessing its IRC server:
- NICK [USA][{OS Version}]{Random Numbers}
- PASS ciaxx
NOTES:
Where {OS Version} can be any of the following depending on affected machine's OS Version:
- 2K
- XP
- VS
- W7
- UNK
It propagates via MSN as one of its backdoor commands using the following file name:
- google_cache113.tmp
It seeds itself in a torrent software as one of its backdoor commands by creating a .torrent file and executing it. The .torrent file it creates uses the following file name:
- %User Temp%\torr.torrent
It deletes itself as one of its backdoor commands by creating and executing the following batch file:
- %User Temp%\removeMe{values}.bat
It does not have rootkit capabilities.
It does not exploit any vulnerability.
SOLUTION
9.300
10.137.80
06 Jul 2013
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
Restart in Safe Mode
Step 3
Delete this registry value
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
- Windows Firewall = "%User Temp%\lsass.exe"
- Windows Firewall = "%User Temp%\lsass.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- Windows Firewall = "%User Temp%\lsass.exe"
- Windows Firewall = "%User Temp%\lsass.exe"
Step 4
Search and delete this folder
- {Removable Drive}:\TTHDHGC
Step 5
Search and delete AUTORUN.INF files created by WORM_PUSHBOT.CY that contain these strings
open=TTHDHGC\DFG-2352-66235-2352322-634621321-6662355\364855.exe
icon=%SystemRoot%\system32\SHELL32.dll,4
action=Open folder to view files
shell\open\command=TTHDHGC\DFG-2352-66235-2352322-634621321-6662355\364855.exe
shell\open\default=1
Step 6
Search and delete these files
- %User Temp%\removeMe{values}.bat
- %User Temp%\torr.torrent
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_PUSHBOT.CY. 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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