PE_SAFOOK.A
Virus:Win32/Safook.A (Microsoft); W32/HLLP.Asub (McAfee); W32.Safook (Symantec); PAK:UPX, Trojan-Downloader.Win32.Agent.bam (Kaspersky); BehavesLike.Win32.Malware.wsc (mx-v) (Sunbelt); Trojan.Downloader.Agent.BAM (FSecure)
Windows 2000, Windows XP, Windows Server 2003
Threat Type: File infector
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This file infector 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 file infector 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 file infector drops the following copies of itself into the affected system:
- %Windows%\winabc3.exe
(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)
Other System Modifications
This file infector deletes the following files:
- %Temp%\scs1.tmp
- %Temp%\scs3.tmp
- %Temp%\scs2.tmp
- %Temp%\scs4.tmp
- %Temp%\scs5.tmp
- %Temp%\scs6.tmp
- %Temp%\scs7.tmp
- %Temp%\scs8.tmp
- %Temp%\scs9.tmp
- %Temp%\scsA.tmp
- %Temp%\scsB.tmp
- %Temp%\scsC.tmp
(Note: %Temp% is the Windows Temporary folder, which is usually C:\Windows\Temp or C:\WINNT\Temp.)
It adds the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer\Run
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer\Run
KernelFaultCheck = "%Windows%\winabc3.exe"
Dropping Routine
This file infector drops the following files:
- ~{malware file name}
- %Windows%\A1.exe
- %Windows%\A2.exe
- %Windows%\A3.exe
- %Windows%\A4.exe
- %Windows%\A5.exe
- %Windows%\A6.exe
(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)
Other Details
This file infector connects to the following possibly malicious URL:
- http://ccred.{BLOCKED}7.com/A1.exe
- http://ccred.{BLOCKED}7.com/A2.exe
- http://ccred.{BLOCKED}7.com/A3.exe
- http://ccred.{BLOCKED}7.com/A4.exe
- http://ccred.{BLOCKED}7.com/A5.exe
- http://ccred.{BLOCKED}7.com/A6.exe
This report is generated via an automated analysis system.
SOLUTION
Step 1
For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.
Step 2
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.
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer
- Run
Step 3
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\policies\Explorer\Run
- KernelFaultCheck = "%Windows%\winabc3.exe"
Step 4
Search and delete these files
- ~{malware file name}
- %Windows%\A1.exe
- %Windows%\A2.exe
- %Windows%\A3.exe
- %Windows%\A4.exe
- %Windows%\A5.exe
- %Windows%\A6.exe
Step 5
Scan your computer with your Trend Micro product to clean files detected as PE_SAFOOK.A. 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 6
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.
- %Temp%\scs1.tmp
- %Temp%\scs3.tmp
- %Temp%\scs2.tmp
- %Temp%\scs4.tmp
- %Temp%\scs5.tmp
- %Temp%\scs6.tmp
- %Temp%\scs7.tmp
- %Temp%\scs8.tmp
- %Temp%\scs9.tmp
- %Temp%\scsA.tmp
- %Temp%\scsB.tmp
- %Temp%\scsC.tmp
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