Malware Analysis Report

2025-08-06 00:46

Sample ID 240608-zby3gafh3t
Target 2024-06-08_490cc71f335c60d7e0655c8258dba016_bkransomware
SHA256 ab0f890a4d3ebd0611f77ff7018453eac882a131a815b68798f73ff45d5c4fa3
Tags
persistence spyware stealer
score
7/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V15

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
7/10

SHA256

ab0f890a4d3ebd0611f77ff7018453eac882a131a815b68798f73ff45d5c4fa3

Threat Level: Shows suspicious behavior

The file 2024-06-08_490cc71f335c60d7e0655c8258dba016_bkransomware was found to be: Shows suspicious behavior.

Malicious Activity Summary

persistence spyware stealer

Executes dropped EXE

Reads user/profile data of web browsers

Adds Run key to start application

Drops file in Windows directory

Unsigned PE

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-06-08 20:33

Signatures

Unsigned PE

Description Indicator Process Target
N/A N/A N/A N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-06-08 20:33

Reported

2024-06-08 20:35

Platform

win7-20240221-en

Max time kernel

121s

Max time network

122s

Command Line

"C:\Users\Admin\AppData\Local\Temp\2024-06-08_490cc71f335c60d7e0655c8258dba016_bkransomware.exe"

Signatures

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Windows\CTS.exe N/A

Reads user/profile data of web browsers

spyware stealer

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\CTS = "C:\\Windows\\CTS.exe" C:\Users\Admin\AppData\Local\Temp\2024-06-08_490cc71f335c60d7e0655c8258dba016_bkransomware.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\CTS = "C:\\Windows\\CTS.exe" C:\Windows\CTS.exe N/A

Drops file in Windows directory

Description Indicator Process Target
File created C:\Windows\CTS.exe C:\Users\Admin\AppData\Local\Temp\2024-06-08_490cc71f335c60d7e0655c8258dba016_bkransomware.exe N/A
File created C:\Windows\CTS.exe C:\Windows\CTS.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\2024-06-08_490cc71f335c60d7e0655c8258dba016_bkransomware.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\CTS.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\2024-06-08_490cc71f335c60d7e0655c8258dba016_bkransomware.exe

"C:\Users\Admin\AppData\Local\Temp\2024-06-08_490cc71f335c60d7e0655c8258dba016_bkransomware.exe"

C:\Windows\CTS.exe

"C:\Windows\CTS.exe"

Network

N/A

Files

C:\Windows\CTS.exe

MD5 f9d4ab0a726adc9b5e4b7d7b724912f1
SHA1 3d42ca2098475924f70ee4a831c4f003b4682328
SHA256 b43be87e8586ca5e995979883468f3b3d9dc5212fbfd0b5f3341a5b7c56e0fbc
SHA512 22a5f0e4b2716244e978ee50771823926f86baf0382ece48fd049f039cf77b5eb0691d83c61148903cff081fdbea969f47b8ed521647717f42bbed5c64552432

C:\Users\Admin\AppData\Local\Temp\cjnACliiHABoqMh.exe

MD5 9c70e3e3fa178cd80940079b570667d5
SHA1 d7f8af9dfb0527bf92bc6198414dee2d56a5f0d9
SHA256 c74cfbaa3095aecb5a7f40ba2a052af25d2eb8aa6195ef5fb44098719fe2b973
SHA512 ea8710abf7941b60c9d15070fb040d65863927b1a158b8ac0db25d18884e11c80d9eea7c868fe0de8c5ddddd1b7ddf45b7ce828f25835ea10b77e96b4b8e16df

Analysis: behavioral2

Detonation Overview

Submitted

2024-06-08 20:33

Reported

2024-06-08 20:35

Platform

win10v2004-20240426-en

Max time kernel

95s

Max time network

124s

Command Line

"C:\Users\Admin\AppData\Local\Temp\2024-06-08_490cc71f335c60d7e0655c8258dba016_bkransomware.exe"

Signatures

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Windows\CTS.exe N/A

Reads user/profile data of web browsers

spyware stealer

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\CTS = "C:\\Windows\\CTS.exe" C:\Users\Admin\AppData\Local\Temp\2024-06-08_490cc71f335c60d7e0655c8258dba016_bkransomware.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\CTS = "C:\\Windows\\CTS.exe" C:\Windows\CTS.exe N/A

Drops file in Windows directory

Description Indicator Process Target
File created C:\Windows\CTS.exe C:\Users\Admin\AppData\Local\Temp\2024-06-08_490cc71f335c60d7e0655c8258dba016_bkransomware.exe N/A
File created C:\Windows\CTS.exe C:\Windows\CTS.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\2024-06-08_490cc71f335c60d7e0655c8258dba016_bkransomware.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\CTS.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\2024-06-08_490cc71f335c60d7e0655c8258dba016_bkransomware.exe

"C:\Users\Admin\AppData\Local\Temp\2024-06-08_490cc71f335c60d7e0655c8258dba016_bkransomware.exe"

C:\Windows\CTS.exe

"C:\Windows\CTS.exe"

Network

Country Destination Domain Proto
US 8.8.8.8:53 228.249.119.40.in-addr.arpa udp
US 8.8.8.8:53 101.58.20.217.in-addr.arpa udp
US 8.8.8.8:53 17.160.190.20.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 149.220.183.52.in-addr.arpa udp
US 8.8.8.8:53 50.23.12.20.in-addr.arpa udp
US 8.8.8.8:53 15.164.165.52.in-addr.arpa udp
US 8.8.8.8:53 240.143.123.92.in-addr.arpa udp
US 8.8.8.8:53 13.227.111.52.in-addr.arpa udp

Files

C:\Windows\CTS.exe

MD5 f9d4ab0a726adc9b5e4b7d7b724912f1
SHA1 3d42ca2098475924f70ee4a831c4f003b4682328
SHA256 b43be87e8586ca5e995979883468f3b3d9dc5212fbfd0b5f3341a5b7c56e0fbc
SHA512 22a5f0e4b2716244e978ee50771823926f86baf0382ece48fd049f039cf77b5eb0691d83c61148903cff081fdbea969f47b8ed521647717f42bbed5c64552432

C:\Users\Admin\AppData\Local\Microsoft\Office\16.0\excel.exe_Rules.xml

MD5 943cdd802b2f6ef59efdb08624c42e60
SHA1 b686995f022711c56a81f10a771730871a9d83dd
SHA256 a2cc877ead25628e93d41909f8f5cc1e2a1bd1e35df734d53655206c8e34d8d3
SHA512 8f8b8e1d9a54926e67a23553820e7f9f20f895e40924ca003b0a1361eee5a627b201985456279b6d91239e8c8b5e0d8f5df1f824fdf047265fb098704ba918db

C:\Users\Admin\AppData\Local\Temp\MxZmWNAGJX7ADo2.exe

MD5 fdfc604ac6340c19f4a59d8ee2610017
SHA1 5397e6a29fde3a1856c1a06d17444b17f6b74cb7
SHA256 c6ad9dc281d1ab8fd6f75f5491c43a557612d022873d2e0edbae823dc7d02505
SHA512 d7224a7972b53286d0ebab0c48cc39f832363772d5d43ccd6fdeee9e282db3cc13af5ff8d2cc6ecb84e6c9e926141d4074507b30a8f799054d4d70fd49211492