RANSOM_ALLCRY.A
Trojan:Win32/Tiggre!rfn (MICROSOFT); Ransom.Crysis (NORTON); Trojan.GenericKD.6141973 (BITDEFENDER)
Windows
Threat Type: Ransomware
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
Dropped by other malware
This Ransomware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
It encrypts files found in specific folders.
TECHNICAL DETAILS
580,096 bytes
EXE
UPX
No
21 Oct 2017
Terminates processes, Displays message/message boxes, Encrypts files,
Arrival Details
This Ransomware 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 Ransomware drops the following copies of itself into the affected system:
- %Windows%\winsrv.exe
(Note: %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)
Autostart Technique
This Ransomware adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Allcry Software\Shell\Open\
Command
(Default) = "%Windows%\winsrv.exe"
Other System Modifications
This Ransomware adds the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
.allcry
(Default) = "Allcry Software"
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001
AllcryID = "{Hardware ID}"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001
AllcryRun = "1"
Process Termination
This Ransomware terminates the following processes if found running in the affected system's memory:
- scanDemo.exe
- mysqld.exe
- nmesrvc.exe
- sqlagent.exe
- fdhost.exe
- fdlauncher.exe
- reportingservicesservice.exe
- omtsreco.exe
- tnslsnr.exe
- oracle.exe
- ScanDemo.exe
- emagent.exe
- java.exe
- perl.exe
- sqlservr.exe
- sqlwriter.exe
- Cmd.exe
Other Details
This Ransomware displays a pop-up window with the following message:
Ransomware Routine
This Ransomware encrypts files found in the following folders:
- %System Root%\test
(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)
It avoids encrypting files with the following strings in their file name:
- .allcry
- .cab
- .dll
- .msi
- .exe
- .lib
- .sys
- .wim
- .h
- .js
- .sql
It appends the following extension to the file name of the encrypted files:
- .allcry
SOLUTION
9.850
13.738.06
24 Oct 2017
13.739.00
25 Oct 2017
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
Identify and terminate files detected as RANSOM_ALLCRY.A
- 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 4
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\Classes\.allcry
- (Default) = "Allcry Software"
- (Default) = "Allcry Software"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Allcry Software\Shell\Open\Command
- (Default) = "%Windows%\winsrv.exe"
- (Default) = "%Windows%\winsrv.exe"
Step 5
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\SYSTEM\ControlSet001
- AllcryID = "{Hardware ID}"
- AllcryID = "{Hardware ID}"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001
- AllcryRun = "1"
- AllcryRun = "1"
Step 6
Scan your computer with your Trend Micro product to delete files detected as RANSOM_ALLCRY.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 the following Trend Micro Support pages for more information:
Step 7
Restore encrypted files from backup.
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