Worm.Win32.DORKBOT.TIGAAAU
TrojanDownloader:Win32/SmallAgent!MTB (Microsoft); GenericRXIG-TN!1425EFC1DE76 (McAfee); Trojan-Banker.Win32.CliptoShuffler.zx (Kaspersky); Troj/DwnLdr-YLF (Sophos)
Windows
![](/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.
TECHNICAL DETAILS
277,504 bytes
EXE
Yes
02 Mar 2020
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 adds the following processes:
- %Windows%\2183022721619\svchost.exe
- %Windows%\7888234607504\svchost.exe
- %User Temp%\3993626189.exe
- %User Temp%\1258637550.exe
- %User Temp%\3552111389.exe
- %User Temp%\3353725755.exe
- %Windows%\1341330876808\svchost.exe
- %User Temp%\3765511625.exe
- %User Temp%\2262225309.exe
- %User Temp%\3789720002.exe
- %User Temp%\2356828896.exe
(Note: %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.. %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)
It creates the following folders:
- %Windows%\1341330876808
- %Windows%\2183022721619
- %Windows%\7888234607504
- F:\__\data
- F:\__
- F:\__\data\photos
(Note: %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)
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
Microsoft Windows Driver = "%Windows%\2183022721619\svchost.exe"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Microsoft Windows Driver = "%Windows%\7888234607504\svchost.exe"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Microsoft Windows Driver = "%Windows%\1341330876808\svchost.exe"
Other System Modifications
This Worm deletes the following files:
- F:\data\WinLines.exe
- %User Temp%\1258637550.exe:Zone.Identifier
- %User Temp%\3464337780.exe:Zone.Identifier
- %Windows%\2183022721619\svchost.exe:Zone.Identifier
- %User Temp%\C2D1.exe:Zone.Identifier
- %User Temp%\3993626189.exe:Zone.Identifier
- F:\data\dolist.txt
- F:\wlines.zip
- %User Temp%\2356828896.exe:Zone.Identifier
- %User Temp%\3789720002.exe:Zone.Identifier
- F:\data\photos\stunning.jpg
- %Windows%\1341330876808\svchost.exe:Zone.Identifier
- F:\data\tmp.doc
- {malware file path and name}:Zone.Identifier
- F:\__\DriveMgr.exe
- %User Temp%\3765511625.exe:Zone.Identifier
- %User Temp%\3353725755.exe:Zone.Identifier
- %User Temp%\4078.exe:Zone.Identifier
- %User Temp%\3552111389.exe:Zone.Identifier
- F:\data\photos\long_exposure.jpg
- %User Temp%\2262225309.exe:Zone.Identifier
- F:\mail_client.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(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)
It deletes the following folders:
- F:\data\photos
- F:\data
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Run
Microsoft Windows Driver = "%Windows%\2183022721619\svchost.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Run
Microsoft Windows Driver = "%Windows%\7888234607504\svchost.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Security Center
AntiVirusOverride = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Security Center
UpdatesOverride = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Security Center
FirewallOverride = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Security Center
AntiVirusDisableNotify = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Security Center
UpdatesDisableNotify = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Security Center
AutoUpdateDisableNotify = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Security Center
FirewallDisableNotify = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Run
Microsoft Windows Driver = "%Windows%\1341330876808\svchost.exe"
Dropping Routine
This Worm drops the following files:
- %User Temp%\1258637550.exe
- F:\__\data\ramdiskui.exe
- %User Temp%\3789720002.exe
- %User Temp%\1344576416191198.jpg
- F:\.lnk
- %System Root%\Program Files\DVD Maker\DVDMaker.exe
- %Windows%\1341330876808\svchost.exe
- %User Temp%\3552111389.exe
- F:\__\data\config.exe
- %User Temp%\3353725755.exe
- %User Temp%\2262225309.exe
- %User Temp%\3464337780.exe
- F:\__\ramdyn.exe
- F:\__\discutilsdevio.exe
- %User Temp%\3765511625.exe
- F:\__\data\discutilsdevio.exe
- F:\__\data\ramdyn.exe
- %System Root%\Program Files\ImDisk\config.exe
- %User Temp%\95233412121010904.jpg
- F:\__\wlines.zip
- F:\__\data\photos\long_exposure.jpg
- F:\__\data\dolist.txt
- %User Temp%\3993626189.exe
- %Windows%\7888234607504\svchost.exe
- F:\__\imdisk-dlg.exe
- %Application Data%\winsvcs.txt
- F:\__\mail_client.exe
- %User Temp%\103921007413753819.jpg
- F:\__\data\tmp.doc
- F:\__\data\WinLines.exe
- F:\__\data\photos\stunning.jpg
- %User Temp%\2356828896.exe
- F:\autorun.inf
- %Windows%\2183022721619\svchost.exe
- F:\__\DriveMgr.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(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.. %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.. %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)
This report is generated via an automated analysis system.
SOLUTION
9.850
Step 1
Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.
Step 2
Restart in Safe Mode
Step 3
Identify and terminate files detected as Worm.Win32.DORKBOT.TIGAAAU
- 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 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
- Microsoft Windows Driver = "%Windows%\2183022721619\svchost.exe"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- Microsoft Windows Driver = "%Windows%\7888234607504\svchost.exe"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- Microsoft Windows Driver = "%Windows%\1341330876808\svchost.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run
- Microsoft Windows Driver = "%Windows%\2183022721619\svchost.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run
- Microsoft Windows Driver = "%Windows%\7888234607504\svchost.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center
- AntiVirusOverride = "1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center
- UpdatesOverride = "1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center
- FirewallOverride = "1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center
- AntiVirusDisableNotify = "1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center
- UpdatesDisableNotify = "1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center
- AutoUpdateDisableNotify = "1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center
- FirewallDisableNotify = "1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run
- Microsoft Windows Driver = "%Windows%\1341330876808\svchost.exe"
Step 5
Search and delete these components
- %User Temp%\1258637550.exe
- F:\__\data\ramdiskui.exe
- %User Temp%\3789720002.exe
- %User Temp%\1344576416191198.jpg
- F:\.lnk
- %System Root%\Program Files\DVD Maker\DVDMaker.exe
- %Windows%\1341330876808\svchost.exe
- %User Temp%\3552111389.exe
- F:\__\data\config.exe
- %User Temp%\3353725755.exe
- %User Temp%\2262225309.exe
- %User Temp%\3464337780.exe
- F:\__\ramdyn.exe
- F:\__\discutilsdevio.exe
- %User Temp%\3765511625.exe
- F:\__\data\discutilsdevio.exe
- F:\__\data\ramdyn.exe
- %System Root%\Program Files\ImDisk\config.exe
- %User Temp%\95233412121010904.jpg
- F:\__\wlines.zip
- F:\__\data\photos\long_exposure.jpg
- F:\__\data\dolist.txt
- %User Temp%\3993626189.exe
- %Windows%\7888234607504\svchost.exe
- F:\__\imdisk-dlg.exe
- %Application Data%\winsvcs.txt
- F:\__\mail_client.exe
- %User Temp%\103921007413753819.jpg
- F:\__\data\tmp.doc
- F:\__\data\WinLines.exe
- F:\__\data\photos\stunning.jpg
- %User Temp%\2356828896.exe
- F:\autorun.inf
- %Windows%\2183022721619\svchost.exe
- F:\__\DriveMgr.exe
Step 6
Search and delete these folders
- %Windows%\1341330876808
- %Windows%\2183022721619
- %Windows%\7888234607504
- F:\__\data
- F:\__
- F:\__\data\photos
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as Worm.Win32.DORKBOT.TIGAAAU. 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.
Step 8
Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.
- F:\data\WinLines.exe
- %User Temp%\1258637550.exe:Zone.Identifier
- %User Temp%\3464337780.exe:Zone.Identifier
- %Windows%\2183022721619\svchost.exe:Zone.Identifier
- %User Temp%\C2D1.exe:Zone.Identifier
- %User Temp%\3993626189.exe:Zone.Identifier
- F:\data\dolist.txt
- F:\wlines.zip
- %User Temp%\2356828896.exe:Zone.Identifier
- %User Temp%\3789720002.exe:Zone.Identifier
- F:\data\photos\stunning.jpg
- %Windows%\1341330876808\svchost.exe:Zone.Identifier
- F:\data\tmp.doc
- {malware file path and name}:Zone.Identifier
- F:\__\DriveMgr.exe
- %User Temp%\3765511625.exe:Zone.Identifier
- %User Temp%\3353725755.exe:Zone.Identifier
- %User Temp%\4078.exe:Zone.Identifier
- %User Temp%\3552111389.exe:Zone.Identifier
- F:\data\photos\long_exposure.jpg
- %User Temp%\2262225309.exe:Zone.Identifier
- F:\mail_client.exe
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