PUA.Win32.InstallCore.USMANHOBKM

February 24, 2020
 PLATFORM:

Windows

 OVERALL RISK RATING:
 REPORTED INFECTION:
 SYSTEM IMPACT RATING:
 INFORMATION EXPOSURE:

  • Threat Type: Potentially Unwanted Application

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Potentially Unwanted Application 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

File Size:

2,628,512 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

24 Feb 2020

Arrival Details

This Potentially Unwanted Application 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 Potentially Unwanted Application adds the following processes:

  • "%User Temp%\is-81AEE.tmp\{malware file name}.tmp" /SL5="$300D0,2379480,205824,{malware file path and name}"
  • "%System%\NOTEPAD.EXE" %Program Files%\Dokanoso\Hetelapaliru.txt
  • %Program Files%\Dokanoso\Hetelapaliru.txt

(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).. %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000(32-bit), Server 2003(32-bit), XP, Vista(64-bit), 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit) , or C:\Program Files (x86) in Windows XP(64-bit), Vista(64-bit), 7(64-bit), 8(64-bit), 8.1(64-bit), 2008(64-bit), 2012(64-bit) and 10(64-bit).)

It creates the following folders:

  • %All Users Profile%\Microsoft\Windows\Start Menu\Programs\Dokanoso
  • %User Temp%\is-RHOBI.tmp\_isetup
  • %Program Files%\Dokanoso

(Note: %All Users Profile% is the common user's profile folder, which is usually C:\Documents and Settings\All Users on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\ProgramData on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit). . %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).. %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000(32-bit), Server 2003(32-bit), XP, Vista(64-bit), 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit) , or C:\Program Files (x86) in Windows XP(64-bit), Vista(64-bit), 7(64-bit), 8(64-bit), 8.1(64-bit), 2008(64-bit), 2012(64-bit) and 10(64-bit).)

Other System Modifications

This Potentially Unwanted Application deletes the following files:

  • %All Users Profile%\Microsoft\Windows\Start Menu\Programs\Dokanoso\Dokanoso.url
  • %All Users Profile%\Microsoft\Windows\Start Menu\Programs\Dokanoso\Dokanoso.pif

(Note: %All Users Profile% is the common user's profile folder, which is usually C:\Documents and Settings\All Users on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\ProgramData on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit). )

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
RestartManager\Session0000
Owner = "\xe4\x0b\x00\x00\x1aj5\x1e\x10\x8c\xd5\x01"

HKEY_CURRENT_USER\Software\Microsoft\
RestartManager\Session0000
SessionHash = "{random characters}"

HKEY_CURRENT_USER\Software\Microsoft\
RestartManager\Session0000
Sequence = "1"

HKEY_CURRENT_USER\Software\Microsoft\
RestartManager\Session0000
RegFiles0000 = "\x00"

HKEY_CURRENT_USER\Software\Microsoft\
RestartManager\Session0000
RegFilesHash = "{random characters}"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\Dokanoso_is1
Inno Setup: Setup Version = "5.5.6 (a)"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\Dokanoso_is1
Inno Setup: App Path = "%Program Files%\Dokanoso"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\Dokanoso_is1
InstallLocation = "%Program Files%\Dokanoso"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\Dokanoso_is1
Inno Setup: Icon Group = "Dokanoso"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\Dokanoso_is1
Inno Setup: User = "{username}"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\Dokanoso_is1
Inno Setup: Language = "default"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\Dokanoso_is1
DisplayName = "Dokanoso version 3.2"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\Dokanoso_is1
DisplayIcon = "%Program Files%\Dokanoso\Nedasamad.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\Dokanoso_is1
UninstallString = "%Program Files%\Dokanoso\unins000.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\Dokanoso_is1
QuietUninstallString = "%Program Files%\Dokanoso\unins000.exe /SILENT"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\Dokanoso_is1
DisplayVersion = "3.2"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\Dokanoso_is1
NoModify = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\Dokanoso_is1
NoRepair = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\Dokanoso_is1
InstallDate = "20191026"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\Dokanoso_is1
MajorVersion = "3"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\Dokanoso_is1
MinorVersion = "2"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\Dokanoso_is1
EstimatedSize = "946"

It deletes the following registry keys:

HKEY_CURRENT_USER\Software\Microsoft\
RestartManager\Session0000\RegFilesHash

HKEY_CURRENT_USER\Software\Microsoft\
RestartManager\Session0000\RegFiles0000

HKEY_CURRENT_USER\Software\Microsoft\
RestartManager\Session0000\Sequence

HKEY_CURRENT_USER\Software\Microsoft\
RestartManager\Session0000\SessionHash

HKEY_CURRENT_USER\Software\Microsoft\
RestartManager\Session0000\Owner

Dropping Routine

This Potentially Unwanted Application drops the following files:

  • %Program Files%\Dokanoso\Neposefopope.odt
  • %Program Files%\Dokanoso\is-01FID.tmp
  • %Program Files%\Dokanoso\is-G1F30.tmp
  • %Program Files%\Dokanoso\Fukemukadap.exe
  • %Program Files%\Dokanoso\is-QQKKB.tmp
  • %Program Files%\Dokanoso\is-NO9UT.tmp
  • %Program Files%\Dokanoso\unins000.dat
  • %Program Files%\Dokanoso\is-PHNEK.tmp
  • %Program Files%\Dokanoso\is-BF3JE.tmp
  • %Program Files%\Dokanoso\Poponebim.jar
  • %Program Files%\Dokanoso\Kerigo.mp3
  • %Program Files%\Dokanoso\Sugihebecot.docx
  • %Program Files%\Dokanoso\is-2DA8O.tmp
  • %Program Files%\Dokanoso\Nunedeside.cpp
  • %Program Files%\Dokanoso\Hetelapaliru.txt
  • %Program Files%\Dokanoso\Cakeridat.odt
  • %Program Files%\Dokanoso\is-T7I1O.tmp
  • %Program Files%\Dokanoso\Sudisatom.do
  • %User Temp%\is-RHOBI.tmp\_isetup\_shfoldr.dll
  • %All Users Profile%\Microsoft\Windows\Start Menu\Programs\Dokanoso\Dokanoso.lnk
  • %Program Files%\Dokanoso\is-8QBFC.tmp
  • %Program Files%\Dokanoso\is-O7TVT.tmp
  • %Program Files%\Dokanoso\unins000.exe
  • %Program Files%\Dokanoso\Pepifececeke.msg
  • %Program Files%\Dokanoso\Locagi.ppt
  • %Program Files%\Dokanoso\is-6B655.tmp
  • %Program Files%\Dokanoso\is-R2SE4.tmp
  • %Program Files%\Dokanoso\is-OG6FO.tmp
  • %Program Files%\Dokanoso\Lahimogutora.kak

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000(32-bit), Server 2003(32-bit), XP, Vista(64-bit), 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit) , or C:\Program Files (x86) in Windows XP(64-bit), Vista(64-bit), 7(64-bit), 8(64-bit), 8.1(64-bit), 2008(64-bit), 2012(64-bit) and 10(64-bit).. %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).. %All Users Profile% is the common user's profile folder, which is usually C:\Documents and Settings\All Users on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\ProgramData 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

Minimum Scan Engine:

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

Identify and terminate files detected as PUA.Win32.InstallCore.USMANHOBKM

[ Learn More ]
  1. 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.
  2. 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.
  3. 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

[ Learn More ]

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\RestartManager\Session0000
    • Owner = "\xe4\x0b\x00\x00\x1aj5\x1e\x10\x8c\xd5\x01"
  • In HKEY_CURRENT_USER\Software\Microsoft\RestartManager\Session0000
    • SessionHash = "{random characters}"
  • In HKEY_CURRENT_USER\Software\Microsoft\RestartManager\Session0000
    • Sequence = "1"
  • In HKEY_CURRENT_USER\Software\Microsoft\RestartManager\Session0000
    • RegFiles0000 = "\x00"
  • In HKEY_CURRENT_USER\Software\Microsoft\RestartManager\Session0000
    • RegFilesHash = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\Dokanoso_is1
    • Inno Setup: Setup Version = "5.5.6 (a)"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\Dokanoso_is1
    • Inno Setup: App Path = "%Program Files%\Dokanoso"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\Dokanoso_is1
    • InstallLocation = "%Program Files%\Dokanoso"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\Dokanoso_is1
    • Inno Setup: Icon Group = "Dokanoso"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\Dokanoso_is1
    • Inno Setup: User = "{username}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\Dokanoso_is1
    • Inno Setup: Language = "default"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\Dokanoso_is1
    • DisplayName = "Dokanoso version 3.2"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\Dokanoso_is1
    • DisplayIcon = "%Program Files%\Dokanoso\Nedasamad.exe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\Dokanoso_is1
    • UninstallString = "%Program Files%\Dokanoso\unins000.exe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\Dokanoso_is1
    • QuietUninstallString = "%Program Files%\Dokanoso\unins000.exe /SILENT"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\Dokanoso_is1
    • DisplayVersion = "3.2"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\Dokanoso_is1
    • NoModify = "1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\Dokanoso_is1
    • NoRepair = "1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\Dokanoso_is1
    • InstallDate = "20191026"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\Dokanoso_is1
    • MajorVersion = "3"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\Dokanoso_is1
    • MinorVersion = "2"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\Dokanoso_is1
    • EstimatedSize = "946"

Step 4

Search and delete these components

[ Learn More ]
There may be some components that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
  • %Program Files%\Dokanoso\Neposefopope.odt
  • %Program Files%\Dokanoso\is-01FID.tmp
  • %Program Files%\Dokanoso\is-G1F30.tmp
  • %Program Files%\Dokanoso\Fukemukadap.exe
  • %Program Files%\Dokanoso\is-QQKKB.tmp
  • %Program Files%\Dokanoso\is-NO9UT.tmp
  • %Program Files%\Dokanoso\unins000.dat
  • %Program Files%\Dokanoso\is-PHNEK.tmp
  • %Program Files%\Dokanoso\is-BF3JE.tmp
  • %Program Files%\Dokanoso\Poponebim.jar
  • %Program Files%\Dokanoso\Kerigo.mp3
  • %Program Files%\Dokanoso\Sugihebecot.docx
  • %Program Files%\Dokanoso\is-2DA8O.tmp
  • %Program Files%\Dokanoso\Nunedeside.cpp
  • %Program Files%\Dokanoso\Hetelapaliru.txt
  • %Program Files%\Dokanoso\Cakeridat.odt
  • %Program Files%\Dokanoso\is-T7I1O.tmp
  • %Program Files%\Dokanoso\Sudisatom.do
  • %User Temp%\is-RHOBI.tmp\_isetup\_shfoldr.dll
  • %All Users Profile%\Microsoft\Windows\Start Menu\Programs\Dokanoso\Dokanoso.lnk
  • %Program Files%\Dokanoso\is-8QBFC.tmp
  • %Program Files%\Dokanoso\is-O7TVT.tmp
  • %Program Files%\Dokanoso\unins000.exe
  • %Program Files%\Dokanoso\Pepifececeke.msg
  • %Program Files%\Dokanoso\Locagi.ppt
  • %Program Files%\Dokanoso\is-6B655.tmp
  • %Program Files%\Dokanoso\is-R2SE4.tmp
  • %Program Files%\Dokanoso\is-OG6FO.tmp
  • %Program Files%\Dokanoso\Lahimogutora.kak

Step 5

Search and delete these folders

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %All Users Profile%\Microsoft\Windows\Start Menu\Programs\Dokanoso
  • %User Temp%\is-RHOBI.tmp\_isetup
  • %Program Files%\Dokanoso

Step 6

Scan your computer with your Trend Micro product to delete files detected as PUA.Win32.InstallCore.USMANHOBKM. 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 the following Trend Micro Support pages for more information:

Step 7

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.

  • %All Users Profile%\Microsoft\Windows\Start Menu\Programs\Dokanoso\Dokanoso.url
  • %All Users Profile%\Microsoft\Windows\Start Menu\Programs\Dokanoso\Dokanoso.pif

Step 8

Restore these deleted registry keys/values from backup

*Note: Only Microsoft-related keys/values will be restored. If the malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.

  • In HKEY_CURRENT_USER\Software\Microsoft\RestartManager\Session0000
    • RegFilesHash
  • In HKEY_CURRENT_USER\Software\Microsoft\RestartManager\Session0000
    • RegFiles0000
  • In HKEY_CURRENT_USER\Software\Microsoft\RestartManager\Session0000
    • Sequence
  • In HKEY_CURRENT_USER\Software\Microsoft\RestartManager\Session0000
    • SessionHash
  • In HKEY_CURRENT_USER\Software\Microsoft\RestartManager\Session0000
    • Owner


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