BKDR_IRCBOT.JSJ
VirTool:Win32/VBInject.gen!IK (Microsoft), a variant of Win32/Injector.AGGA 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: 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.
TECHNICAL DETAILS
195,577 bytes
EXE
Yes
08 May 2013
Connects to URLs/IPs, Compromises system security
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 adds the following mutexes to ensure that only one of its copies runs at any one time:
- ev1l1lod1ld0s
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\Run
Windongs = "{malware path and file name}"
Backdoor Routine
This backdoor connects to any of the following IRC server(s):
- {BLOCKED}.{BLOCKED}.cat
It accesses a remote Internet Relay Chat (IRC) server where it receives the following commands from a remote malicious user:
- (DOWNLOAD): Download and execute file
- (GET): Send GET floods
- (HELP): Show available commands
- (OPENURL): Open a URL using a hidden browser
- (POST): Send POST floods
- (QUIT): Terminate itself
- (SHELL EXEC): Execute shell command
- (SPEEDTEST): Check connection speed
- (STOP EXEC): Stop a specific thread
- (STOP GET): Stop GET floods
- (STOP SPEEDTEST): Stop speedtest
- (STOP SYN): Stop a SYN Flood
- (STOP UDP): Stop UDP Flooding
- (SYN): Send a SYN Flood
- (UDP): Start UDP Flooding
- (VERSION): Show Bot Version
Other Details
This backdoor uses the following credentials when accessing its IRC server:
- NICK: zwin-{random letters}|{random number}|
NOTES:
It connects to any of the following sites to perform a speed test:
- http://speedtest1.hivelocity.net/speedtest/upload.php?x={random value}
- http://rolotech-electronics.comuf.com/speedtest/upload.php?x={random value}
SOLUTION
9.300
9.902.08
08 May 2013
9.903.00
08 May 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
Identify and terminate files detected as BKDR_IRCBOT.JSJ
- Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
- If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
- If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.
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\Run
- Windongs = "{malware path and file name}"
- Windongs = "{malware path and file name}"
Step 4
Scan your computer with your Trend Micro product to delete files detected as BKDR_IRCBOT.JSJ. 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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