Malware Analysis Report

2024-10-19 10:27

Sample ID 240305-jpkt1aah27
Target b42e7395d548094719753ce21cafc064
SHA256 95f5e8a8f81cc22aa687cf82e0d6cadbf130f25018fa0097710927ed40d2f939
Tags
isrstealer bootkit persistence stealer trojan spyware
score
10/10

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
10/10

SHA256

95f5e8a8f81cc22aa687cf82e0d6cadbf130f25018fa0097710927ed40d2f939

Threat Level: Known bad

The file b42e7395d548094719753ce21cafc064 was found to be: Known bad.

Malicious Activity Summary

isrstealer bootkit persistence stealer trojan spyware

ISR Stealer payload

ISR Stealer

Loads dropped DLL

Executes dropped EXE

Reads data files stored by FTP clients

Reads user/profile data of web browsers

Checks computer location settings

Adds Run key to start application

Writes to the Master Boot Record (MBR)

Suspicious use of SetThreadContext

Unsigned PE

Enumerates physical storage devices

Suspicious behavior: EnumeratesProcesses

Suspicious use of WriteProcessMemory

Suspicious use of SetWindowsHookEx

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-03-05 07:50

Signatures

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-03-05 07:50

Reported

2024-03-05 07:53

Platform

win7-20240221-en

Max time kernel

129s

Max time network

132s

Command Line

"C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe"

Signatures

ISR Stealer

trojan stealer isrstealer

ISR Stealer payload

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

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\mw_111221_passwd.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\mw_111221_vnpanel.exe N/A

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\USER\S-1-5-21-3787592910-3720486031-2929222812-1000\Software\Microsoft\Windows\CurrentVersion\Run\crssr = "C:\\Users\\Admin\\AppData\\Roaming\\crssr" C:\Users\Admin\AppData\Local\Temp\mw_111221_vnpanel.exe N/A

Writes to the Master Boot Record (MBR)

bootkit persistence
Description Indicator Process Target
File opened for modification \??\PhysicalDrive0 C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe N/A

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 1856 set thread context of 2236 N/A C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe

Enumerates physical storage devices

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 1856 wrote to memory of 2236 N/A C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe
PID 1856 wrote to memory of 2236 N/A C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe
PID 1856 wrote to memory of 2236 N/A C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe
PID 1856 wrote to memory of 2236 N/A C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe
PID 1856 wrote to memory of 2236 N/A C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe
PID 1856 wrote to memory of 2236 N/A C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe
PID 1856 wrote to memory of 2236 N/A C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe
PID 1856 wrote to memory of 2236 N/A C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe
PID 1856 wrote to memory of 2236 N/A C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe
PID 2236 wrote to memory of 2672 N/A C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe C:\Users\Admin\AppData\Local\Temp\mw_111221_passwd.exe
PID 2236 wrote to memory of 2672 N/A C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe C:\Users\Admin\AppData\Local\Temp\mw_111221_passwd.exe
PID 2236 wrote to memory of 2672 N/A C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe C:\Users\Admin\AppData\Local\Temp\mw_111221_passwd.exe
PID 2236 wrote to memory of 2672 N/A C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe C:\Users\Admin\AppData\Local\Temp\mw_111221_passwd.exe
PID 2236 wrote to memory of 2500 N/A C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe C:\Users\Admin\AppData\Local\Temp\mw_111221_vnpanel.exe
PID 2236 wrote to memory of 2500 N/A C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe C:\Users\Admin\AppData\Local\Temp\mw_111221_vnpanel.exe
PID 2236 wrote to memory of 2500 N/A C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe C:\Users\Admin\AppData\Local\Temp\mw_111221_vnpanel.exe
PID 2236 wrote to memory of 2500 N/A C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe C:\Users\Admin\AppData\Local\Temp\mw_111221_vnpanel.exe

Processes

C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe

"C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe"

C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe

"C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe"

C:\Users\Admin\AppData\Local\Temp\mw_111221_passwd.exe

"C:\Users\Admin\AppData\Local\Temp\mw_111221_passwd.exe"

C:\Users\Admin\AppData\Local\Temp\mw_111221_vnpanel.exe

"C:\Users\Admin\AppData\Local\Temp\mw_111221_vnpanel.exe"

Network

Country Destination Domain Proto
US 8.8.8.8:53 mw.webcampaign.de udp

Files

memory/2236-2-0x0000000000400000-0x0000000000449000-memory.dmp

memory/2236-4-0x0000000000400000-0x0000000000449000-memory.dmp

memory/2236-6-0x0000000000400000-0x0000000000449000-memory.dmp

memory/2236-10-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

memory/2236-12-0x0000000000400000-0x0000000000449000-memory.dmp

memory/2236-14-0x0000000000400000-0x0000000000449000-memory.dmp

\Users\Admin\AppData\Local\Temp\mw_111221_passwd.exe

MD5 32c96c4a94e4066cc6eeb2b0d24dfc36
SHA1 d256f6ea46af1c578d96b59d945f00880f9aa4f0
SHA256 02d227751808eb5cd476c91d6b2f8260c812042de78fc04ae3770168f2873f97
SHA512 af0e6c6b8ba9769b5981780740b00bac46c3cc1ae552e5d6a6a29f6eeb4df312e3f39cbd163e5d612125ae2f91173432b6a22aa1dcccc7c5eff9aafad0692fe2

\Users\Admin\AppData\Local\Temp\mw_111221_vnpanel.exe

MD5 16cde6a521edcd5cc7fa9860096f9222
SHA1 b69246e52d0adee6725fd9ec69c7a7b9974b7634
SHA256 cdd686b7f74b3f0224bbc44daffe7fa9cc9309838866f1586d317a7df5e5df6f
SHA512 41ebfe0a023213113e13307d9bcea0f780f9604cdaa444ce73cc720156d2f3868f1f32c585ad2eb8a8bdd60a0d0ba14e1140d1fd484b4cd75de8ff02826869b9

memory/2236-36-0x0000000000400000-0x0000000000449000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-03-05 07:50

Reported

2024-03-05 07:53

Platform

win10v2004-20240226-en

Max time kernel

150s

Max time network

153s

Command Line

"C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe"

Signatures

ISR Stealer

trojan stealer isrstealer

ISR Stealer payload

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

Checks computer location settings

Description Indicator Process Target
Key value queried \REGISTRY\USER\S-1-5-21-275798769-4264537674-1142822080-1000\Control Panel\International\Geo\Nation C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe N/A

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\mw_111221_passwd.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\mw_111221_vnpanel.exe N/A

Reads data files stored by FTP clients

spyware stealer

Reads user/profile data of web browsers

spyware stealer

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\USER\S-1-5-21-275798769-4264537674-1142822080-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\crssr = "C:\\Users\\Admin\\AppData\\Roaming\\crssr" C:\Users\Admin\AppData\Local\Temp\mw_111221_vnpanel.exe N/A

Writes to the Master Boot Record (MBR)

bootkit persistence
Description Indicator Process Target
File opened for modification \??\PhysicalDrive0 C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe N/A

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 1056 set thread context of 4508 N/A C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe

Enumerates physical storage devices

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 1056 wrote to memory of 4508 N/A C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe
PID 1056 wrote to memory of 4508 N/A C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe
PID 1056 wrote to memory of 4508 N/A C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe
PID 1056 wrote to memory of 4508 N/A C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe
PID 1056 wrote to memory of 4508 N/A C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe
PID 1056 wrote to memory of 4508 N/A C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe
PID 1056 wrote to memory of 4508 N/A C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe
PID 1056 wrote to memory of 4508 N/A C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe
PID 4508 wrote to memory of 4560 N/A C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe C:\Users\Admin\AppData\Local\Temp\mw_111221_passwd.exe
PID 4508 wrote to memory of 4560 N/A C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe C:\Users\Admin\AppData\Local\Temp\mw_111221_passwd.exe
PID 4508 wrote to memory of 4560 N/A C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe C:\Users\Admin\AppData\Local\Temp\mw_111221_passwd.exe
PID 4508 wrote to memory of 3592 N/A C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe C:\Users\Admin\AppData\Local\Temp\mw_111221_vnpanel.exe
PID 4508 wrote to memory of 3592 N/A C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe C:\Users\Admin\AppData\Local\Temp\mw_111221_vnpanel.exe
PID 4508 wrote to memory of 3592 N/A C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe C:\Users\Admin\AppData\Local\Temp\mw_111221_vnpanel.exe

Processes

C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe

"C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe"

C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe

"C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064.exe"

C:\Users\Admin\AppData\Local\Temp\mw_111221_passwd.exe

"C:\Users\Admin\AppData\Local\Temp\mw_111221_passwd.exe"

C:\Users\Admin\AppData\Local\Temp\mw_111221_vnpanel.exe

"C:\Users\Admin\AppData\Local\Temp\mw_111221_vnpanel.exe"

Network

Country Destination Domain Proto
US 8.8.8.8:53 133.211.185.52.in-addr.arpa udp
US 8.8.8.8:53 73.159.190.20.in-addr.arpa udp
US 8.8.8.8:53 9.228.82.20.in-addr.arpa udp
US 8.8.8.8:53 mw.webcampaign.de udp
US 8.8.8.8:53 187.178.17.96.in-addr.arpa udp
US 8.8.8.8:53 57.169.31.20.in-addr.arpa udp
US 8.8.8.8:53 41.110.16.96.in-addr.arpa udp
US 8.8.8.8:53 50.23.12.20.in-addr.arpa udp
US 8.8.8.8:53 56.126.166.20.in-addr.arpa udp
US 8.8.8.8:53 58.55.71.13.in-addr.arpa udp
US 8.8.8.8:53 209.205.72.20.in-addr.arpa udp
US 20.231.121.79:80 tcp
US 8.8.8.8:53 mw.webcampaign.de udp
US 8.8.8.8:53 240.221.184.93.in-addr.arpa udp
US 8.8.8.8:53 104.241.123.92.in-addr.arpa udp
US 8.8.8.8:53 119.110.54.20.in-addr.arpa udp
US 8.8.8.8:53 180.178.17.96.in-addr.arpa udp
US 8.8.8.8:53 mw.webcampaign.de udp
US 8.8.8.8:53 18.134.221.88.in-addr.arpa udp
US 8.8.8.8:53 211.178.17.96.in-addr.arpa udp
US 8.8.8.8:53 211.135.221.88.in-addr.arpa udp
US 8.8.8.8:53 55.36.223.20.in-addr.arpa udp
US 8.8.8.8:53 13.227.111.52.in-addr.arpa udp
US 8.8.8.8:53 mw.webcampaign.de udp
US 8.8.8.8:53 tse1.mm.bing.net udp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 8.8.8.8:53 217.135.221.88.in-addr.arpa udp
US 8.8.8.8:53 mw.webcampaign.de udp
US 8.8.8.8:53 91.65.42.20.in-addr.arpa udp

Files

memory/4508-2-0x0000000000400000-0x0000000000449000-memory.dmp

memory/4508-4-0x0000000000400000-0x0000000000449000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\mw_111221_passwd.exe

MD5 32c96c4a94e4066cc6eeb2b0d24dfc36
SHA1 d256f6ea46af1c578d96b59d945f00880f9aa4f0
SHA256 02d227751808eb5cd476c91d6b2f8260c812042de78fc04ae3770168f2873f97
SHA512 af0e6c6b8ba9769b5981780740b00bac46c3cc1ae552e5d6a6a29f6eeb4df312e3f39cbd163e5d612125ae2f91173432b6a22aa1dcccc7c5eff9aafad0692fe2

C:\Users\Admin\AppData\Local\Temp\mw_111221_vnpanel.exe

MD5 16cde6a521edcd5cc7fa9860096f9222
SHA1 b69246e52d0adee6725fd9ec69c7a7b9974b7634
SHA256 cdd686b7f74b3f0224bbc44daffe7fa9cc9309838866f1586d317a7df5e5df6f
SHA512 41ebfe0a023213113e13307d9bcea0f780f9604cdaa444ce73cc720156d2f3868f1f32c585ad2eb8a8bdd60a0d0ba14e1140d1fd484b4cd75de8ff02826869b9

memory/4508-28-0x0000000000400000-0x0000000000449000-memory.dmp