RANSOM_XDATA.A
Trojan.Ransom.Xdata(ALYac)
Windows
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Ransomware
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
Dropped by other malware, Downloaded from the Internet
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 deletes itself after execution.
TECHNICAL DETAILS
944,128 bytes
EXE
Yes
19 May 2017
Encrypts files, Displays message/message boxes
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 files:
- %Application Data%\{file name}
where {file name} can be any of the following:- mssql.exe
- mscomrpc.exe
- mscom.exe
- msdcom.exe
- mssec.exe
- mssecsvc.exe
- msdns.exe
- msaddc.exe
- %Application Data%\{file name} - copy of itself
where {file name} can be any of the following:- lsm.exe
- conhost.exe
- dwm.exe
- smss.exe
- lsass.exe
- wuaclt.exe
- services.exe
- svchost.exe
- taskhost.exe
- wininit.exe
- %All Users Profile%\{computer name}#-{random values}-#-{yyyyMMddhhmmss}-{random number}.key
- %System Root%\{computer name}#-{random values}-#-{yyyyMMddhhmmss}-{random number}.key
- %Desktop%\{computer name}#-{random values}-#-{yyyyMMddhhmmss}-{random number}.key
- %Application Data%\{file name}
where {file name} can be any of the following:- explorer.exe
- spoolss.exe
- spoolsv.exe
- system.exe
- {folder of encrypted files}\HOW_CAN_I_DECRYPT_MY_FILES.txt - ransom note
(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming 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.. %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.. %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.. %Desktop% is the desktop folder, where it usually is C:\Documents and Settings\{user name}\Desktop in Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\Desktop in 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.)
Other Details
This Ransomware does the following:
- It clears all Windows Event logs using the wevtutil.exe command.
It deletes itself after execution.
Ransomware Routine
This Ransomware renames encrypted files using the following names:
- {original filename and extension}.~xdata~
NOTES:
The ransom note contains the following:
SOLUTION
9.850
13.416.05
19 May 2017
13.417.00
20 May 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
Restart in Safe Mode
Step 4
Search and delete this file
- {folder of encrypted files}\HOW_CAN_I_DECRYPT_MY_FILES.txt
- explorer.exe
- spoolss.exe
- spoolsv.exe
- system.exe
- mssql.exe
- mscomrpc.exe
- mscom.exe
- msdcom.exe
- mssec.exe
- mssecsvc.exe
- msdns.exe
- msaddc.exe
- %All Users Profile%\{computer name}#-{random values}-#-{yyyyMMddhhmmss}-{random number}.key
- %System Root%\{computer name}#-{random values}-#-{yyyyMMddhhmmss}-{random number}.key
- %Desktop%\{computer name}#-{random values}-#-{yyyyMMddhhmmss}-{random number}.key
Step 5
Restart in normal mode and scan your computer with your Trend Micro product for files detected as RANSOM_XDATA.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 encrypted files from backup.
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