Malware Analysis Report

2024-11-13 14:28

Sample ID 240603-lrlkesbg27
Target 2024-06-03_eed7c72ac005ec2aff1842c04688a730_bkransomware
SHA256 491adfdc3cce051731ea87c3ca9e16ffcdd8d8cc9e10d9649f8b49d5575def92
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

491adfdc3cce051731ea87c3ca9e16ffcdd8d8cc9e10d9649f8b49d5575def92

Threat Level: Shows suspicious behavior

The file 2024-06-03_eed7c72ac005ec2aff1842c04688a730_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

2024-06-03 09:46

Signatures

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-06-03 09:46

Reported

2024-06-03 09:48

Platform

win7-20240508-en

Max time kernel

118s

Max time network

118s

Command Line

"C:\Users\Admin\AppData\Local\Temp\2024-06-03_eed7c72ac005ec2aff1842c04688a730_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\2024-06-03_eed7c72ac005ec2aff1842c04688a730_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\2024-06-03_eed7c72ac005ec2aff1842c04688a730_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\2024-06-03_eed7c72ac005ec2aff1842c04688a730_bkransomware.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\CTS.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\2024-06-03_eed7c72ac005ec2aff1842c04688a730_bkransomware.exe

"C:\Users\Admin\AppData\Local\Temp\2024-06-03_eed7c72ac005ec2aff1842c04688a730_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\SvyHz1zgaXS2vBc.exe

MD5 21e544ff9c1e4bb3185a25f0a71c1a01
SHA1 1d44474e33167c196c66a19dae2bbfb1ae37c402
SHA256 f17987676d34e3a70a2101bf0d48737472fc73b2a9ee16a0d181cff1d095824a
SHA512 bdfa3b0354b862a0db9931f68bed1984da5c2a21462fcbc213a642513130b9410a870cc51d34cf810f22f4b0f997f9e5a41f2852c226025ea27b09cb3eee506c

Analysis: behavioral2

Detonation Overview

Submitted

2024-06-03 09:46

Reported

2024-06-03 09:48

Platform

win10v2004-20240426-en

Max time kernel

92s

Max time network

94s

Command Line

"C:\Users\Admin\AppData\Local\Temp\2024-06-03_eed7c72ac005ec2aff1842c04688a730_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\2024-06-03_eed7c72ac005ec2aff1842c04688a730_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\2024-06-03_eed7c72ac005ec2aff1842c04688a730_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\2024-06-03_eed7c72ac005ec2aff1842c04688a730_bkransomware.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\CTS.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\2024-06-03_eed7c72ac005ec2aff1842c04688a730_bkransomware.exe

"C:\Users\Admin\AppData\Local\Temp\2024-06-03_eed7c72ac005ec2aff1842c04688a730_bkransomware.exe"

C:\Windows\CTS.exe

"C:\Windows\CTS.exe"

Network

Country Destination Domain Proto
US 8.8.8.8:53 104.219.191.52.in-addr.arpa udp
US 8.8.8.8:53 88.210.23.2.in-addr.arpa udp
US 8.8.8.8:53 67.31.126.40.in-addr.arpa udp
US 8.8.8.8:53 217.106.137.52.in-addr.arpa udp
US 8.8.8.8:53 183.59.114.20.in-addr.arpa udp
US 8.8.8.8:53 15.164.165.52.in-addr.arpa udp
US 8.8.8.8:53 97.90.14.23.in-addr.arpa udp
US 8.8.8.8:53 30.243.111.52.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 8d4a552c02bd977f7f99f7f34adb866f
SHA1 707944e73a0dbc7cc768edcb625f1d62eabc129f
SHA256 458e7cba3b5da1407271567433ced020d2ccf4b57bf7db4fada141b68bd43a04
SHA512 bc38b58e5aca68b955452f3a4a44dae42b2760b5501b9011afc989fb67713efcbb959377444a49563caa104f632e53abc1d63701a34876f56d189f358afdbce0

C:\Users\Admin\AppData\Local\Temp\piEkocDQIPq3ujK.exe

MD5 027e94f3e2dd93dfe8b0d69118fed7d5
SHA1 6a0187e291539a6c11b64a1d5ca56f097d8e4343
SHA256 dc68c1c45c77b7130185702ddd2996d3d407178912644b04c08f8eda80fe7a25
SHA512 2e535b394625f64a376e53aafebea467d58d259ca274bdf870948b2d2f042754c189de3e6a56e48d799dcf57ae26b94b7e45d379a256dec50defa87f4d9b3519