BKDR_GBOT.FSM
Trojan:W32/Malex.D(FSecure), BDS/Gbod.swr(Antivir), W32/Gimemo.CEH!tr(Fortinet), Trojan.Win32.Ransom(Ikarus)
Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Backdoor
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
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 executes commands from a remote malicious user, effectively compromising the affected system. It connects to a website to send and receive information.
TECHNICAL DETAILS
75,264 bytes
EXE
No
02 Oct 2013
Connects to URLs/IPs
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 and executes them:
- %Windows%\WinUpdaterstd\svchost.exe
(Note: %Windows% is the Windows folder, which is usually C:\Windows.)
It creates the following folders:
- %Windows%\WinUpdaterstd
(Note: %Windows% is the Windows folder, which is usually C:\Windows.)
Autostart Technique
This backdoor adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer\Run
WinUpdaterstd = "%Windows%\WinUpdaterstd\svchost.exe"
Backdoor Routine
This backdoor executes the following commands from a remote malicious user:
- simplehttpflood - HTTP flooding in simple mode
- httpflood - HTTP flooding
- ghttpflood - HTTP flooding excluding the "idle" load bots
- inthttpflood - HTTP flooding in intelligent mode (used to monitor user activity)
- highhttpflood - HTTP flooding in aggressive mode
- posthttpflood - HTTP flooding (POST)
- intposthttpflood - HTTP flooding in intelligent mode
- icmpflood - ICMP flooding
- inticmpflood - ICMP flooding in intelligent mode
- newtimeout - Change pause between requests
- stop - cancel previous command
- update - update itself
It connects to the following websites to send and receive information:
- http://{BLOCKED}ll.ru/gbot/getcmd.php?id=-{Malware ID}&traff=0
NOTES:
This backdoor uses the following websites as its fake referrer:
- http://2ip.ru/
- http://pentagon.afis.osd.mil/
- http://upyachka.ru/
- http://vkontakte.ru/
- http://whois.domaintools.com/
- http://wikipedia.o g/
- http://www.1tv.ru/
- http://www.f-1.ru/
- http://www.fc-zenit.ru/
- http://www.google.com/
- http://www.hardcoreporn.com/
- http://www.lenta.ru/
- http://www.live.com/
- http://www.mail.ru/
- http://www.mozilla-europe.org/
- http://www.mywestside.com/
- http://www.nigma.ru/
- http://www.nysite.com/
- http://www.opera.com/
- http://www.rambler.ru/
- http://www.sexymama.com/
- http://www.vkontakte.ru/
- http://www.wannabrowser.ru/
- http://www.webmoney.ru/
- http://www.westside-barbell.com/
- http://www.westsiderentals.com/
- http://www.westsidestory.com/
- http://www.westwestsidemusic.com/
- http://www.yahoo.com/
- http://www.youtube.com/
SOLUTION
9.300
9.876.05
24 Apr 2013
9.877.00
24 Apr 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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\Run
- WinUpdaterstd = "%Windows%\WinUpdaterstd\svchost.exe"
- WinUpdaterstd = "%Windows%\WinUpdaterstd\svchost.exe"
Step 4
Search and delete this folder
- %Windows%\WinUpdaterstd
Step 5
Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_GBOT.FSM. 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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