WORM_GOLROTED.ABAFN
Trojan:Win32/Dynamer!ac(Microsot)
Windows
Threat Type: Worm
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
Propagates via removable drives, Downloaded from the Internet
This worm arrives via removable drives. It 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.
It steals sensitive information such as user names and passwords related to certain games.
TECHNICAL DETAILS
1,534,976 bytes
Yes
28 Jul 2016
Connects to URLs/IPs, Steals information
Arrival Details
This worm arrives via removable drives.
It 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:
- %Application Data%\Windows Update.exe
(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)
It drops the following files:
- %Application Data%\pid.txt - contains the Process ID of the malware.
- %Application Data%\pidloc.txt - contains the full path of the malware where it is executed.
(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)
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 Update = "%Application Data%\Windows Update.exe"
Other System Modifications
This worm modifies the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
Hidden = 1
(Note: The default value data of the said registry entry is 2.)
Propagation
This worm drops the following copy(ies) of itself in all removable drives:
- {Removable Drive}:\Sys.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=Sys.exe
action=Run win32
Information Theft
This worm steals sensitive information such as user names and passwords related to the following games:
- Steam
- Minecraft
It gathers the following data:
- Server Name
- Keyboard Logs
- Clipboard Logs
- Time Logs
- Stealers Enabled
- Local Date and Time
- Installed Language
- Operating System
- Internal IP Address
- External IP Address
- Installed Anti-Virus
- Installed Firewall
It attempts to steal stored email credentials from the following:
- Internet Account Manager
- Outlook Express
- Microsoft Outlook
- Windows Mail
- Windows Live Mail
- Incredimail
- Eudora
- Netscape
- Google Talk
- Google Desktop
- Gmail
- Hotmail
- Yahoo
- GroupMail
It attempts to get stored information such as user names, passwords, and hostnames from the following browsers:
- Internet Explorer
- Mozilla Firefox
- Google Chrome
- Safari
- Opera
Drop Points
This worm sends the information it gathers to the following email addresses:
- logs@{BLOCKED}wo.com
Other Details
This worm connects to the following URL(s) to get the affected system's IP address:
- http://whatismyipaddress.com
It does the following:
- This worm hides the files that it drops in removable drives.
SOLUTION
9.800
12.688.03
01 Aug 2016
12.689.00
02 Aug 2016
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
Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.
Step 3
Restart in Safe Mode
Step 4
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 Update = "%Application Data%\Windows Update.exe"
- Windows Update = "%Application Data%\Windows Update.exe"
Step 5
Restore this modified 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\Explorer\ Advanced
- From: Hidden = 1
To: Hidden = {User Preference}
- From: Hidden = 1
Step 6
Search and delete AUTORUN.INF files created by WORM_GOLROTED.ABAFN that contain these strings
- [autorun]
- open=Sys.exe
- action=Run win32
Step 7
Search and delete this file
- %Application Data%\pid.txt
- %Application Data%\pidloc.txt
Step 8
Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_GOLROTED.ABAFN. 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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