Ransom.PS1.SODINOKIBI.B

August 05, 2020

Analysis by: Clive Fuentebella

ALIASES:

N/A

PLATFORM:

Windows

OVERALL RISK RATING:

DAMAGE POTENTIAL:

DISTRIBUTION POTENTIAL:

REPORTED INFECTION:

INFORMATION EXPOSURE:

Threat Type: Ransomware
Destructiveness: No
Encrypted: Yes
In the wild: Yes

OVERVIEW

Infection Channel:

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 drops files as ransom note. It avoids encrypting files with the following file extensions.

TECHNICAL DETAILS

File Size:

1,373,641 bytes

File Type:

PS1

Memory Resident:

Yes

Initial Samples Received Date:

29 Jul 2020

Payload:

Drops files, Terminates processes, Displays message/message boxes, Steals information

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:

%User Temp%\{Random characters}.bmp

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

It adds the following processes:

powershell -e {Base-64 encoded command} (to delete shadow copies)

Process Termination

This Ransomware terminates processes or services that contain any of the following strings if found running in the affected system's memory:

mysql
mepocs
veeam
vss
backup
sql
memtas
sophos
svc$l

Information Theft

Upon execution of the affected application, it gathers the following information:

Username
Computer name
Operating system
Processor information
Workgroup

Stolen Information

This Ransomware sends the gathered information via HTTP POST to the following URL:

https://{Domain}/{String 1}/{String 2}/{Random characters}
- Domain:
- String 1:
- String 2:

Ransomware Routine

This Ransomware avoids encrypting files with the following strings in their file name:

autorun.inf
ntldr
bootfont.bin
ntuser.ini
boot.ini
ntuser.dat.log
thumbs.db
desktop.ini
ntuser.dat
iconcache.db
bootsect.bak

It avoids encrypting files with the following strings in their file path:

google
$recycle.bin
tor browser
application data
boot
windows.old
intel
system volume information
msocache
$windows.~bt
programdata
program files
$windows.~ws
appdata
perflogs
program files (x86)
mozilla
windows

It appends the following extension to the file name of the encrypted files:

.{Random characters}

It drops the following file(s) as ransom note:

{Encrypted directory}\{Random characters}-readme.txt

It avoids encrypting files with the following file extensions:

ani
com
idx
adv
prf
key
ics
drv
icl
cur
shs
mpa
msi
lnk
bat
386
themepack
msstyles
diagcfg
cpl
rtp
deskthemepack
spl
ps1
diagcab
nomedia
msc
msu
wpx
icns
nls
hta
ocx
ico
theme
sys
mod
cab
msp
scr
diagpkg
hlp
rom
ldf
dll
lock
cmd
exe
bin

NOTES:

This Ransomware displays the following images:

SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

16.132.05

FIRST VSAPI PATTERN DATE:

29 Jul 2020

VSAPI OPR PATTERN File:

16.133.00

VSAPI OPR PATTERN Date:

30 Jul 2020

Step 1

Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 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

[ Learn More ]

Step 4

Search and delete these files

[ Learn More ]

There may be some files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.

%User Temp%\{Random characters}.bmp
{Encrypted directory}\{Random characters}-readme.txt

Step 5

Restart in normal mode and scan your computer with your Trend Micro product for files detected as Ransom.PS1.SODINOKIBI.B. 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.

Did this description help? Tell us how we did.

Ransom.PS1.SODINOKIBI.B

OVERVIEW

TECHNICAL DETAILS

SOLUTION

Resources

Support

About Trend

Country Headquarters

Ransom.PS1.SODINOKIBI.B

OVERVIEW

TECHNICAL DETAILS

SOLUTION

Resources

Support

About Trend

Country Headquarters

The Americas

Middle East & Africa

Europe

Asia & Pacific