TROJ_OTOTI.YAJV
Windows
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Trojan
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
Downloaded from the Internet, Dropped by other malware
This Trojan 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
954,880 bytes
EXE
Yes
05 Apr 2017
Drops files
Arrival Details
This Trojan 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 Trojan drops and executes the following files:
- %Windows%\SetACL.exe - normal file (set attributes to Hidden)
Notes: With the following parameters: "-on "HKLM\SOFTWARE\ESET\ESET Security\CurrentVersion\Info" -ot reg -actn clear -clr dacl,sacl -silent"
(Note: %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)
Other System Modifications
This Trojan adds the following registry keys as part of its installation routine:
HKEY_LOCAL_MACHINE\Software\ESET
It also creates the following registry entry(ies) as part of its installation routine:
HKEY_LOCAL_MACHINE\SOFTWARE\ESET\
ESET Security
FirstUse = 1
HKEY_LOCAL_MACHINE\SOFTWARE\ESET\
ESET Security\CurrentVersion\Info
PackageTag = 1620109144
HKEY_LOCAL_MACHINE\SOFTWARE\ESET\
ESET Security\CurrentVersion\Info
ScannerVersion = Open window for status.
HKEY_LOCAL_MACHINE\SOFTWARE\ESET\
ESET Security\CurrentVersion\IPlugins\
01000400\Profiles\@My profile
SelectedServer = autoselect
HKEY_LOCAL_MACHINE\SOFTWARE\ESET\
ESET Security\CurrentVersion\Plugins\
01000400\Settings
InstallTime = 1970/01/01 00:00:00
HKEY_LOCAL_MACHINE\SOFTWARE\ESET\
ESET Security\CurrentVersion\Plugins\
01000400\Settings
LastUpdateAttempt = 1970/01/01 00:00:00
HKEY_LOCAL_MACHINE\SOFTWARE\ESET\
ESET Security\CurrentVersion\Plugins\
01000400\Settings
LastUpdate = 1970/01/01 00:00:00
HKEY_LOCAL_MACHINE\SOFTWARE\ESET\
ESET Security\CurrentVersion\Plugins\
01000400\Settings
FailSafeServer = http://update.eset.com/eset_eval/
HKEY_LOCAL_MACHINE\SOFTWARE\ESET\
ESET Security\CurrentVersion\Plugins\
01000400\Settings
RegistrationType = 0
HKEY_LOCAL_MACHINE\SOFTWARE\ESET\
ESET Security\CurrentVersion\Plugins\
01000400\Settings
Registration = 1
HKEY_LOCAL_MACHINE\SOFTWARE\ESET\
ESET Security\CurrentVersion\LicenseInfo
ExpirationDate = 1970/01/01 00:00:00
HKEY_LOCAL_MACHINE\SOFTWARE\ESET\
ESET Security\CurrentVersion\LicenseInfo
TimeStamp = 1970/01/01 00:00:00
HKEY_LOCAL_MACHINE\SOFTWARE\ESET\
ESET Security\CurrentVersion\Plugins\
01000101\Profiles\@My profile
Autostart = 1
HKEY_LOCAL_MACHINE\SOFTWARE\ESET\
ESET Security\CurrentVersion\Plugins\
01000600\Profiles\@My profile
SelfdefenceEnabled = 1
It deletes the following registry keys:
HKEY_LOCAL_MACHINE\Software\ESET
Process Termination
This Trojan terminates the following processes if found running in the affected system's memory:
- egui.exe
Other Details
This Trojan does the following:
- It check installed AV product by searching the following files:
- %Program Files%\ESET\ESET NOD32 Antivirus\egui.exe
- It executes the following commands:
- @Comspec /c sc config ekrn start = disabled
- @Comspec /c sc config ekrn start= auto
- @Comspec /c net start ekrn
- cmd.exe %Program Files%\ESET\ESET NOD32 Antivirus\ecmd.exe /update open
(Note: %Program Files% is the Program Files folder, where it usually is C:\Program Files on all Windows operating system versions; C:\Program Files (x86) for 32-bit applications running on Windows 64-bit operating systems.)
SOLUTION
9.850
13.320.03
05 Apr 2017
13.321.00
06 Apr 2017
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 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. Before you could do this, you must restart in Safe Mode. For instructions on how to do this, you may refer to this page If the preceding step requires you to restart in safe mode, you may proceed to edit the system registry.
- In HKEY_LOCAL_MACHINE\Software
- ESET
- ESET
Step 5
Search and delete this file
- %Windows%\SetACL.exe
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_OTOTI.YAJV. 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.
Did this description help? Tell us how we did.