BKDR_GBOT.A
Trojan:Win32/Seleya.A(Microsoft),Trojan.Gen(Norton),Trojan.Win32.Rorpian.d (v)(Sunbelt),W32/Rorpian.C!tr(Fortinet),Win32/Seleya.A 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)
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Backdoor
Destructiveness: No
Encrypted: Yes
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.
TECHNICAL DETAILS
133,632 bytes
EXE
Yes
22 Apr 2013
Compromises system security, Connects to URLs/IPs, Steals information
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:
- %User Temp%\WinUpdaterstd\svchost.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 creates the following folders:
- %User Temp%\WinUpdaterstd
(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.)
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
Update service = "%User Temp%\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
- oldhttpflood - HTTP/HTTPS flooding in the old mode
- intoldhttpflood - HTTP/HTTPS flooding in the old intellectual mode
- 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 URL(s) to send and receive commands from a remote malicious user:
- http://{BLOCKED}oid.net//./././getcmd.php?id=-{Malware ID}&traff=0
Information Theft
This backdoor attempts to steal stored account information used in the following installed File Transfer Protocol (FTP) clients or file manager software:
- FlashFXP
- FileZilla
- SmartFTP
- GHISLER
- ALFTP
It gathers the following account information from any of the mentioned File Transfer Protocol (FTP) clients or file manager software:
- User ID
- Host Name
- Password
- Port Number
SOLUTION
9.300
9.872.05
22 Apr 2013
9.873.00
22 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
- Update service = "%User Temp%\WinUpdaterstd\svchost.exe"
- Update service = "%User Temp%\WinUpdaterstd\svchost.exe"
Step 4
Search and delete these folders
- %User Temp%\WinUpdaterstd
Step 5
Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_GBOT.A. 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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