TROJ_KRYPTIK.RQL
PWS:Win32/Fareit.gen!C (Microsoft), Trojan-PSW.Win32.Tepfer.npos (Kaspersky), W32/Kryptik.BFHP (Fortinet)
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:
In the wild: Yes
OVERVIEW
This Trojan may arrive bundled with malware packages as a malware component. It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
It modifies the Internet Explorer Zone Settings.
It deletes itself after execution.
TECHNICAL DETAILS
214,016 bytes
EXE
Yes
04 Jul 2013
Arrival Details
This Trojan may arrive bundled with malware packages as a malware component.
It 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 files:
- %Application Data%\{Chosen Folder}\{Random File Name 1}.exe
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.)
It drops the following file(s)/component(s):
- %Application Data%\{Chosen Folder}\user.js
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.)
Autostart Technique
This Trojan adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{Random File Name 2}.exe = "%Application Data%\{Chosen Folder}\{Random File Name 1}.exe"
Web Browser Home Page and Search Page Modification
This Trojan modifies the Internet Explorer Zone Settings.
Other Details
This Trojan connects to the following possibly malicious URL:
- http://{BLOCKED}ctions.cc:18365
- http://{BLOCKED}je.cc/ping.html
- http://{BLOCKED}hi.cc/ping.html
- http://{BLOCKED}ju.cc/ping.html
- http://{BLOCKED}je.cc/files/rar.exe
- http://{BLOCKED}er.su/ping.html
- http://{BLOCKED}go.cc/ping.html
- http://{BLOCKED}a2b5wf.aenaethi.cc
It deletes itself after execution.
NOTES:
{Chosen Folder} is any chosen folder under %Application Data%.
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
Scan your computer with your Trend Micro product and note files detected as TROJ_KRYPTIK.RQL
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
- {Random File Name 2}.exe = "%Application Data%\{Chosen Folder}\{Random File Name 1}.exe"
- {Random File Name 2}.exe = "%Application Data%\{Chosen Folder}\{Random File Name 1}.exe"
Step 5
Search and delete this file
- %Application Data%\{Chosen Folder}\{Random File Name 1}.exe
- %Application Data%\{Chosen Folder}\user.js
Step 6
Reset Internet security settings
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_KRYPTIK.RQL. 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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