TROJ_PHER.SA
TrojanDownloader:Win32/Pher.A (Microsoft), W32/Pher.HHP!tr.dldr (Fortinet), Trojan-Downloader.Win32.Pher (Ikarus),
Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
Threat Type: Trojan
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
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
1,678,336 bytes
EXE
Yes
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 the following copies of itself into the affected system:
- %Program Files%\mcmst\{malware name}.exe
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)
It creates the following folders:
- %Program Files%\mcmst
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)
It adds the following mutexes to ensure that only one of its copies runs at any one time:
- {malware name}.exe
Autostart Technique
This Trojan adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
{malware name}.exe = "%Program Files%\mcmst\{malware name}.exe"
Other System Modifications
This Trojan adds the following registry entries as part of its installation routine:
HKEY_LOCAL_MACHINE\SOFTWARE\mcmst
date = "{date of execution}"
HKEY_LOCAL_MACHINE\SOFTWARE\sink
inchk = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\sink
version = ""
HKEY_LOCAL_MACHINE\SOFTWARE\sink
inchkter = "1"
It adds the following registry keys as part of its installation routine:
HKEY_LOCAL_MACHINE\SOFTWARE\mcmst
HKEY_LOCAL_MACHINE\SOFTWARE\sink
Other Details
This Trojan connects to the following URL(s) to check for an Internet connection:
- http://naver.com/
- http://www.naver.com/
SOLUTION
9.300
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
Identify and terminate files detected as TROJ_PHER.SA
- 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 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. 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
- mcmst
- mcmst
- In HKEY_LOCAL_MACHINE\SOFTWARE
- sink
- sink
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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- {malware name}.exe = "%Program Files%\mcmst\{malware name}.exe"
- {malware name}.exe = "%Program Files%\mcmst\{malware name}.exe"
Step 5
Search and delete these folders
Step 6
Scan your computer with your Trend Micro product to delete files detected as TROJ_PHER.SA. 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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