WORM_PSYOKYM.IRT
Worm:Win32/Psyokym.C (Microsoft), Trojan.Win32.Diple (Ikarus), Found Luhe.Fiha.A (AVG)
Windows
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
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 copies of itself into the affected system:
- %ProgramData%\{user name}.exe for Windows 7
- %All Users Profile%\{user name}.exe for Windows 7
- %All Users Profile%\Application Data\{user name}.exe for Windows XP
(Note: %ProgramData% is the Program Data folder, where it usually is C:\Program Files in Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\ProgramData in 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.. %All Users Profile% is the All Users folder, where it usually is C:\Documents and Settings\All Users on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\ProgramData 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:
- %User Temp%\~DF{random alphanumeric characters}.TMP
(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp 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
System32 = %ProgramData%\{user name}.exe for Windows 7
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
System32 = %All Users Profile%\Application Data\{user name}.exe for Windows XP
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
System32 = %ProgramData%\{user name}.exe for Windows 7
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
System32 = %All Users Profile%\Application Data\{user name}.exe for Windows XP
Other System Modifications
This worm modifies the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
HideFileExt = 1
(Note: The default value data of the said registry entry is 0.)
Download Routine
This worm saves the files it downloads using the following names:
- %ProgramData%\habeys.exe for Windows 7
- %All Users Profile%\habeys.exe for Windows 7
- %All Users Profile%\Application Data\habeys.exe for Windows XP
(Note: %ProgramData% is the Program Data folder, where it usually is C:\Program Files in Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\ProgramData in 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.. %All Users Profile% is the All Users folder, where it usually is C:\Documents and Settings\All Users on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\ProgramData 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.)
Other Details
This worm connects to the following possibly malicious URL:
- http://www.{BLOCKED}ushionline.net/habeys.exe
- http://{BLOCKED}o.{BLOCKED}tr.com/domain/www.hoarafushionline.net
- http://{BLOCKED}o.{BLOCKED}w.hoarafushionline.net/d5a153f6e8a637bfcbd304c6b8d0572b
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
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
- System32 = %ProgramData%\{user name}.exe
- System32 = %ProgramData%\{user name}.exe
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- System32 = %All Users Profile%\Application Data\{user name}.exe
- System32 = %All Users Profile%\Application Data\{user name}.exe
- In HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
- System32 = %ProgramData%\{user name}.exe
- System32 = %ProgramData%\{user name}.exe
- In HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
- System32 = %All Users Profile%\Application Data\{user name}.exe
- System32 = %All Users Profile%\Application Data\{user name}.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: HideFileExt = 1
To: HideFileExt = 0
- From: HideFileExt = 1
Step 6
Search and delete these files
- %User Temp%\~DF{random alphanumeric characters}.TMP
- %ProgramData%\habeys.exe for Windows 7
- %All Users Profile%\habeys.exe for Windows 7
- %All Users Profile%\Application Data\habeys.exe for Windows XP
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_PSYOKYM.IRT. 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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