WORM_AUTORUN.ESK
VirTool:Win32/VBInject.TE(Microsoft), Win32/AutoRun.KS worm(Eset)
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: Worm
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This worm 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.
TECHNICAL DETAILS
Arrival Details
This worm 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 component file(s):
- {Drive Letter}:\tko_je\to_rekao\DesKTop.ini
- %System Root%\tko_je\to_rekao\DesKTop.ini
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)
It drops the following copies of itself into the affected system:
- %System Root%\tko_je\to_rekao\j3k5any.exe
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)
It creates the following folders:
- %System Root%\tko_je
- %System Root%\tko_je\to_rekao
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)
Autostart Technique
This worm adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{random}
StubPath = "{Drive Letter}:\tko_je\to_rekao\j3k5any.exe"
Other System Modifications
This worm adds the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{random}
Propagation
This worm creates the following folders in all removable drives:
- {Drive Letter}:\tko_je
- {Drive Letter}:\tko_je\to_rekao
It drops the following copy(ies) of itself in all removable drives:
- {Drive Letter}:\tko_je\to_rekao\j3k5any.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=tko_je\to_rekao\j3k5any.exe
;While Karl Aloys zu Fürstenberg fought for the Habsburg cause in Serbia, in France,
;Karl Aloys zu Fürstenberg (26 June 1760 - 25 March 1799) was an Austrian military commander.
action=Open folder to view files
shell\oepn=Open
shell\open\command=tko_je\to_rekao\j3k5any.exe
shell\open\default=1
Other Details
This worm connects to the following possibly malicious URL:
- acc7w3lv3.{BLOCKED}s.org
- accn1n3.{BLOCKED}on-the.net
- acc313v3n.{BLOCKED}as.comt
SOLUTION
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 key
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\Active Setup\Installed Components
- {random}
- {random}
Step 4
Search and delete these folders
- {Drive Letter}:\tko_je
- %System Root%\tko_je
Step 5
Search and delete AUTORUN.INF files created by WORM_AUTORUN.ESK that contain these strings
[autorun]
open=tko_je\to_rekao\j3k5any.exe
;While Karl Aloys zu Fürstenberg fought for the Habsburg cause in Serbia, in France,
;Karl Aloys zu Fürstenberg (26 June 1760 - 25 March 1799) was an Austrian military commander.
action=Open folder to view files
shell\oepn=Open
shell\open\command=tko_je\to_rekao\j3k5any.exe
shell\open\default=1
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_AUTORUN.ESK. 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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