Malware Analysis Report

2025-01-18 16:44

Sample ID 221002-lrs99shhb3
Target 4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab
SHA256 4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab
Tags
isrstealer collection spyware stealer trojan upx
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V6

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

4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab

Threat Level: Known bad

The file 4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab was found to be: Known bad.

Malicious Activity Summary

isrstealer collection spyware stealer trojan upx

ISR Stealer payload

Isrstealer family

ISR Stealer

Nirsoft

NirSoft MailPassView

UPX packed file

Reads user/profile data of web browsers

Accesses Microsoft Outlook accounts

Suspicious use of SetThreadContext

Suspicious use of WriteProcessMemory

Suspicious use of SetWindowsHookEx

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2022-10-02 09:46

Signatures

ISR Stealer payload

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

Isrstealer family

isrstealer

Analysis: behavioral1

Detonation Overview

Submitted

2022-10-02 09:46

Reported

2022-10-02 12:20

Platform

win7-20220812-en

Max time kernel

24s

Max time network

46s

Command Line

"C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe"

Signatures

ISR Stealer

trojan stealer isrstealer

NirSoft MailPassView

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

Nirsoft

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

UPX packed file

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

Reads user/profile data of web browsers

spyware stealer

Accesses Microsoft Outlook accounts

collection
Description Indicator Process Target
Key opened \REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe N/A

Suspicious use of SetWindowsHookEx

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 1808 wrote to memory of 1628 N/A C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe
PID 1808 wrote to memory of 1628 N/A C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe
PID 1808 wrote to memory of 1628 N/A C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe
PID 1808 wrote to memory of 1628 N/A C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe
PID 1808 wrote to memory of 1628 N/A C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe
PID 1808 wrote to memory of 1628 N/A C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe
PID 1808 wrote to memory of 1628 N/A C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe
PID 1808 wrote to memory of 1628 N/A C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe
PID 1808 wrote to memory of 1628 N/A C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe
PID 1808 wrote to memory of 1584 N/A C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe
PID 1808 wrote to memory of 1584 N/A C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe
PID 1808 wrote to memory of 1584 N/A C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe
PID 1808 wrote to memory of 1584 N/A C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe
PID 1808 wrote to memory of 1584 N/A C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe
PID 1808 wrote to memory of 1584 N/A C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe
PID 1808 wrote to memory of 1584 N/A C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe
PID 1808 wrote to memory of 1584 N/A C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe
PID 1808 wrote to memory of 1584 N/A C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe

Processes

C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe

"C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe"

C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe

/scomma "C:\Users\Admin\AppData\Local\Temp\HmSOL9z2pe.ini"

C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe

/scomma "C:\Users\Admin\AppData\Local\Temp\nCwrp9Cqly.ini"

Network

Country Destination Domain Proto
US 8.8.8.8:53 texh.hj.cx udp
DE 64.190.63.111:80 texh.hj.cx tcp

Files

memory/1628-56-0x0000000000400000-0x0000000000453000-memory.dmp

memory/1628-57-0x00000000004512E0-mapping.dmp

memory/1628-59-0x0000000075211000-0x0000000075213000-memory.dmp

memory/1628-60-0x0000000000400000-0x0000000000453000-memory.dmp

memory/1628-61-0x0000000000400000-0x0000000000453000-memory.dmp

memory/1628-62-0x0000000000400000-0x0000000000453000-memory.dmp

memory/1628-63-0x0000000000400000-0x0000000000453000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\HmSOL9z2pe.ini

MD5 d1ea279fb5559c020a1b4137dc4de237
SHA1 db6f8988af46b56216a6f0daf95ab8c9bdb57400
SHA256 fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba
SHA512 720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

memory/1584-66-0x0000000000400000-0x000000000041F000-memory.dmp

memory/1584-67-0x000000000041C410-mapping.dmp

memory/1584-70-0x0000000000400000-0x000000000041F000-memory.dmp

memory/1584-71-0x0000000000400000-0x000000000041F000-memory.dmp

memory/1584-72-0x0000000000400000-0x000000000041F000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2022-10-02 09:46

Reported

2022-10-02 12:20

Platform

win10v2004-20220812-en

Max time kernel

92s

Max time network

167s

Command Line

"C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe"

Signatures

NirSoft MailPassView

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

Nirsoft

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

UPX packed file

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

Reads user/profile data of web browsers

spyware stealer

Accesses Microsoft Outlook accounts

collection
Description Indicator Process Target
Key opened \REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe N/A

Suspicious use of SetWindowsHookEx

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 4836 wrote to memory of 4756 N/A C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe
PID 4836 wrote to memory of 4756 N/A C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe
PID 4836 wrote to memory of 4756 N/A C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe
PID 4836 wrote to memory of 4756 N/A C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe
PID 4836 wrote to memory of 4756 N/A C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe
PID 4836 wrote to memory of 4756 N/A C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe
PID 4836 wrote to memory of 4756 N/A C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe
PID 4836 wrote to memory of 4756 N/A C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe
PID 4836 wrote to memory of 1460 N/A C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe
PID 4836 wrote to memory of 1460 N/A C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe
PID 4836 wrote to memory of 1460 N/A C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe
PID 4836 wrote to memory of 1460 N/A C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe
PID 4836 wrote to memory of 1460 N/A C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe
PID 4836 wrote to memory of 1460 N/A C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe
PID 4836 wrote to memory of 1460 N/A C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe
PID 4836 wrote to memory of 1460 N/A C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe

Processes

C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe

"C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe"

C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe

/scomma "C:\Users\Admin\AppData\Local\Temp\9dSa6n8KoA.ini"

C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe

/scomma "C:\Users\Admin\AppData\Local\Temp\uWxqkozI0Q.ini"

Network

Country Destination Domain Proto
US 93.184.221.240:80 tcp
US 93.184.221.240:80 tcp
US 93.184.220.29:80 tcp
US 93.184.221.240:80 tcp
US 8.8.8.8:53 texh.hj.cx udp
DE 64.190.63.111:80 texh.hj.cx tcp
NL 104.80.225.205:443 tcp
US 93.184.221.240:80 tcp
IE 13.69.239.73:443 tcp
US 93.184.220.29:80 tcp

Files

memory/4756-134-0x0000000000000000-mapping.dmp

memory/4756-135-0x0000000000400000-0x0000000000453000-memory.dmp

memory/4756-137-0x0000000000400000-0x0000000000453000-memory.dmp

memory/4756-138-0x0000000000400000-0x0000000000453000-memory.dmp

memory/4756-139-0x0000000000400000-0x0000000000453000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\9dSa6n8KoA.ini

MD5 d1ea279fb5559c020a1b4137dc4de237
SHA1 db6f8988af46b56216a6f0daf95ab8c9bdb57400
SHA256 fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba
SHA512 720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

memory/1460-141-0x0000000000000000-mapping.dmp

memory/1460-142-0x0000000000400000-0x000000000041F000-memory.dmp

memory/1460-144-0x0000000000400000-0x000000000041F000-memory.dmp

memory/1460-145-0x0000000000400000-0x000000000041F000-memory.dmp

memory/1460-146-0x0000000000400000-0x000000000041F000-memory.dmp