TROJ_CRYPLOCK.H
Ransom:Win32/Teerac.A (MICROSOFT), Trojan-Ransom.Win32.Crypren.qej (KASPERSKY),
Windows
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Trojan
Destructiveness: No
Encrypted: No
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
299,084 bytes
EXE
Yes
06 Nov 2014
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 files:
- %All Users Profile%\Application Data\{random folder name}\00000000
- %All Users Profile%\Application Data\{random folder name}\01000000
- %All Users Profile%\Application Data\{random folder name}\02000000
- %All Users Profile%\Application Data\{random folder name}\03000000
- %All Users Profile%\Application Data\{random folder name}\04000000
(Note: %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 copies of itself into the affected system:
- %Windows%\{random file name}.exe
(Note: %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)
It creates the following folders:
- %All Users Profile%\Application Data\{random folder name}
(Note: %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.)
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
(random key) = "%Windows%\{random file name}.exe"
Other Details
This Trojan connects to the following possibly malicious URL:
- http://{BLOCKED}happy.ru:443
NOTES:
This Trojan renames encrypted files using the file name {original file name and extension}.encrypted. It drops the ransom note DECRYPT_INSTRUCTIONS.html in every folder it encrypts.
SOLUTION
9.700
11.268.05
10 Nov 2014
11.269.00
11 Nov 2014
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
Search and delete this folder
- %All Users Profile%\Application Data\{random folder name}
Step 5
Search and delete these files
- DECRYPT_INSTRUCTIONS.html
Step 6
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
- (random key) = "%Windows%\{random file name}.exe"
- (random key) = "%Windows%\{random file name}.exe"
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_CRYPLOCK.H. 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.
NOTES:
Restore the encrypted files by this malware from backup. Note that the encrypted files have the extension .encrypted.
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