Malware Analysis Report

2024-11-30 06:43

Sample ID 240604-bzag1sgf8z
Target 2024-06-04_67e0e55fcd10c7e2686d053bca192be8_bkransomware
SHA256 da548f8455e682da362cfc259f86839b6587edb51f13bcdb2674b232662342a6
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

da548f8455e682da362cfc259f86839b6587edb51f13bcdb2674b232662342a6

Threat Level: Shows suspicious behavior

The file 2024-06-04_67e0e55fcd10c7e2686d053bca192be8_bkransomware was found to be: Shows suspicious behavior.

Malicious Activity Summary

persistence spyware stealer

Reads user/profile data of web browsers

Executes dropped EXE

Loads dropped DLL

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

2024-06-04 01:34

Signatures

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-06-04 01:34

Reported

2024-06-04 01:38

Platform

win7-20240215-en

Max time kernel

121s

Max time network

122s

Command Line

"C:\Users\Admin\AppData\Local\Temp\2024-06-04_67e0e55fcd10c7e2686d053bca192be8_bkransomware.exe"

Signatures

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\L1BV1DdqI9lYPyw.exe N/A
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\2024-06-04_67e0e55fcd10c7e2686d053bca192be8_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\2024-06-04_67e0e55fcd10c7e2686d053bca192be8_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\2024-06-04_67e0e55fcd10c7e2686d053bca192be8_bkransomware.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\CTS.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\2024-06-04_67e0e55fcd10c7e2686d053bca192be8_bkransomware.exe

"C:\Users\Admin\AppData\Local\Temp\2024-06-04_67e0e55fcd10c7e2686d053bca192be8_bkransomware.exe"

C:\Users\Admin\AppData\Local\Temp\L1BV1DdqI9lYPyw.exe

C:\Users\Admin\AppData\Local\Temp\L1BV1DdqI9lYPyw.exe

C:\Windows\CTS.exe

"C:\Windows\CTS.exe"

Network

N/A

Files

\Users\Admin\AppData\Local\Temp\L1BV1DdqI9lYPyw.exe

MD5 abbd49c180a2f8703f6306d6fa731fdc
SHA1 d63f4bfe7f74936b2fbace803e3da6103fbf6586
SHA256 5f411c0bd9ed9a42b0f07ed568c7d0cf358a83063b225a1f8f7da3296dde90f1
SHA512 290dd984acc451b778f3db8c510bae7aec1d9547c3ad0a1829df731c136e4ecc9a37dc6a786cf8f1ecc4d14339aed1288af25055f450f6f953138c8d4d5c36e9

C:\Windows\CTS.exe

MD5 f9d4ab0a726adc9b5e4b7d7b724912f1
SHA1 3d42ca2098475924f70ee4a831c4f003b4682328
SHA256 b43be87e8586ca5e995979883468f3b3d9dc5212fbfd0b5f3341a5b7c56e0fbc
SHA512 22a5f0e4b2716244e978ee50771823926f86baf0382ece48fd049f039cf77b5eb0691d83c61148903cff081fdbea969f47b8ed521647717f42bbed5c64552432

memory/2916-15-0x0000000000400000-0x000000000040D000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\L1BV1DdqI9lYPyw.exe

MD5 14d794dbd99ee8df3f9fb40d30aae8b3
SHA1 e6295432d8d7a21a0c9036099a3198988db9444f
SHA256 5071dfae960c0619e9228204d05368b42e6a5b2d77be3553ec4454ae1a035b80
SHA512 536e2e515d34956c77f1ee47afa67f99d70b1fc795bdef97b4f749833226d412d40dfa982f7e2d26bc5012bdfd9297babb93f08e65d4d0d62504521b45602728

Analysis: behavioral2

Detonation Overview

Submitted

2024-06-04 01:34

Reported

2024-06-04 01:38

Platform

win10v2004-20240426-en

Max time kernel

148s

Max time network

151s

Command Line

"C:\Users\Admin\AppData\Local\Temp\2024-06-04_67e0e55fcd10c7e2686d053bca192be8_bkransomware.exe"

Signatures

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\x2qrxqvmWsVHwar.exe N/A
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\2024-06-04_67e0e55fcd10c7e2686d053bca192be8_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\2024-06-04_67e0e55fcd10c7e2686d053bca192be8_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\2024-06-04_67e0e55fcd10c7e2686d053bca192be8_bkransomware.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\CTS.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\2024-06-04_67e0e55fcd10c7e2686d053bca192be8_bkransomware.exe

"C:\Users\Admin\AppData\Local\Temp\2024-06-04_67e0e55fcd10c7e2686d053bca192be8_bkransomware.exe"

C:\Users\Admin\AppData\Local\Temp\x2qrxqvmWsVHwar.exe

C:\Users\Admin\AppData\Local\Temp\x2qrxqvmWsVHwar.exe

C:\Windows\CTS.exe

"C:\Windows\CTS.exe"

Network

Country Destination Domain Proto
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 133.211.185.52.in-addr.arpa udp
US 8.8.8.8:53 82.90.14.23.in-addr.arpa udp
US 8.8.8.8:53 138.32.126.40.in-addr.arpa udp
US 8.8.8.8:53 97.17.167.52.in-addr.arpa udp
US 8.8.8.8:53 232.168.11.51.in-addr.arpa udp
US 8.8.8.8:53 157.123.68.40.in-addr.arpa udp
US 8.8.8.8:53 198.187.3.20.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 14.227.111.52.in-addr.arpa udp
US 8.8.8.8:53 24.73.42.20.in-addr.arpa udp

Files

C:\Users\Admin\AppData\Local\Temp\x2qrxqvmWsVHwar.exe

MD5 abbd49c180a2f8703f6306d6fa731fdc
SHA1 d63f4bfe7f74936b2fbace803e3da6103fbf6586
SHA256 5f411c0bd9ed9a42b0f07ed568c7d0cf358a83063b225a1f8f7da3296dde90f1
SHA512 290dd984acc451b778f3db8c510bae7aec1d9547c3ad0a1829df731c136e4ecc9a37dc6a786cf8f1ecc4d14339aed1288af25055f450f6f953138c8d4d5c36e9

C:\Windows\CTS.exe

MD5 f9d4ab0a726adc9b5e4b7d7b724912f1
SHA1 3d42ca2098475924f70ee4a831c4f003b4682328
SHA256 b43be87e8586ca5e995979883468f3b3d9dc5212fbfd0b5f3341a5b7c56e0fbc
SHA512 22a5f0e4b2716244e978ee50771823926f86baf0382ece48fd049f039cf77b5eb0691d83c61148903cff081fdbea969f47b8ed521647717f42bbed5c64552432

memory/1832-10-0x0000000000400000-0x000000000040D000-memory.dmp

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

MD5 e7d8003a2a7e5c28e2bdcdf7a925c69f
SHA1 6546a3ba4349f73070365351da226d2a566d17ef
SHA256 4c77fd0ffde096ef4360d67eeb3dbab31e48773326c31d163e5f6f3972f910e9
SHA512 db40ecdd053823ef3a1da32aba2fb9ae07a778b2818874302144275cb3f0ae3f7b789ee484228152df5da1d46ad27c3f8de0d94235e30c4b094e6f32c65b9442