Malware Analysis Report

2025-01-18 16:46

Sample ID 220312-jvp1xadbcm
Target 91ed0d89cfea28fa7889128593cb541b3da9088cf5ea5b8b09047f765b275d9f
SHA256 91ed0d89cfea28fa7889128593cb541b3da9088cf5ea5b8b09047f765b275d9f
Tags
isrstealer 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

91ed0d89cfea28fa7889128593cb541b3da9088cf5ea5b8b09047f765b275d9f

Threat Level: Known bad

The file 91ed0d89cfea28fa7889128593cb541b3da9088cf5ea5b8b09047f765b275d9f was found to be: Known bad.

Malicious Activity Summary

isrstealer spyware stealer trojan upx

Isrstealer family

ISR Stealer

ISR Stealer Payload

UPX packed file

Reads user/profile data of web browsers

Suspicious use of SetThreadContext

Suspicious use of AdjustPrivilegeToken

Suspicious use of SetWindowsHookEx

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2022-03-12 07:59

Signatures

ISR Stealer Payload

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

Isrstealer family

isrstealer

Analysis: behavioral1

Detonation Overview

Submitted

2022-03-12 07:59

Reported

2022-03-12 09:13

Platform

win7-20220310-en

Max time kernel

4294178s

Max time network

130s

Command Line

"C:\Users\Admin\AppData\Local\Temp\91ed0d89cfea28fa7889128593cb541b3da9088cf5ea5b8b09047f765b275d9f.exe"

Signatures

ISR Stealer

trojan stealer isrstealer

ISR Stealer Payload

Description Indicator Process Target
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

Reads user/profile data of web browsers

spyware stealer

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\91ed0d89cfea28fa7889128593cb541b3da9088cf5ea5b8b09047f765b275d9f.exe N/A

Suspicious use of SetWindowsHookEx

Description Indicator Process Target
N/A N/A C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 1428 wrote to memory of 1808 N/A C:\Users\Admin\AppData\Local\Temp\91ed0d89cfea28fa7889128593cb541b3da9088cf5ea5b8b09047f765b275d9f.exe C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe
PID 1428 wrote to memory of 1808 N/A C:\Users\Admin\AppData\Local\Temp\91ed0d89cfea28fa7889128593cb541b3da9088cf5ea5b8b09047f765b275d9f.exe C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe
PID 1428 wrote to memory of 1808 N/A C:\Users\Admin\AppData\Local\Temp\91ed0d89cfea28fa7889128593cb541b3da9088cf5ea5b8b09047f765b275d9f.exe C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe
PID 1428 wrote to memory of 1808 N/A C:\Users\Admin\AppData\Local\Temp\91ed0d89cfea28fa7889128593cb541b3da9088cf5ea5b8b09047f765b275d9f.exe C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe
PID 1428 wrote to memory of 1808 N/A C:\Users\Admin\AppData\Local\Temp\91ed0d89cfea28fa7889128593cb541b3da9088cf5ea5b8b09047f765b275d9f.exe C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe
PID 1428 wrote to memory of 1808 N/A C:\Users\Admin\AppData\Local\Temp\91ed0d89cfea28fa7889128593cb541b3da9088cf5ea5b8b09047f765b275d9f.exe C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe
PID 1428 wrote to memory of 1808 N/A C:\Users\Admin\AppData\Local\Temp\91ed0d89cfea28fa7889128593cb541b3da9088cf5ea5b8b09047f765b275d9f.exe C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe
PID 1428 wrote to memory of 1808 N/A C:\Users\Admin\AppData\Local\Temp\91ed0d89cfea28fa7889128593cb541b3da9088cf5ea5b8b09047f765b275d9f.exe C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe
PID 1428 wrote to memory of 1808 N/A C:\Users\Admin\AppData\Local\Temp\91ed0d89cfea28fa7889128593cb541b3da9088cf5ea5b8b09047f765b275d9f.exe C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe
PID 1428 wrote to memory of 1808 N/A C:\Users\Admin\AppData\Local\Temp\91ed0d89cfea28fa7889128593cb541b3da9088cf5ea5b8b09047f765b275d9f.exe C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe
PID 1428 wrote to memory of 1808 N/A C:\Users\Admin\AppData\Local\Temp\91ed0d89cfea28fa7889128593cb541b3da9088cf5ea5b8b09047f765b275d9f.exe C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe
PID 1428 wrote to memory of 1808 N/A C:\Users\Admin\AppData\Local\Temp\91ed0d89cfea28fa7889128593cb541b3da9088cf5ea5b8b09047f765b275d9f.exe C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe
PID 1808 wrote to memory of 1780 N/A C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe
PID 1808 wrote to memory of 1780 N/A C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe
PID 1808 wrote to memory of 1780 N/A C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe
PID 1808 wrote to memory of 1780 N/A C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe
PID 1808 wrote to memory of 1780 N/A C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe
PID 1808 wrote to memory of 1780 N/A C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe
PID 1808 wrote to memory of 1780 N/A C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe
PID 1808 wrote to memory of 1780 N/A C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe
PID 1808 wrote to memory of 1780 N/A C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe
PID 1808 wrote to memory of 1780 N/A C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe
PID 1808 wrote to memory of 1780 N/A C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe
PID 1808 wrote to memory of 1780 N/A C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe
PID 1808 wrote to memory of 1100 N/A C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe
PID 1808 wrote to memory of 1100 N/A C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe
PID 1808 wrote to memory of 1100 N/A C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe
PID 1808 wrote to memory of 1100 N/A C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe
PID 1808 wrote to memory of 1100 N/A C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe
PID 1808 wrote to memory of 1100 N/A C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe
PID 1808 wrote to memory of 1100 N/A C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe
PID 1808 wrote to memory of 1100 N/A C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe
PID 1808 wrote to memory of 1100 N/A C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe
PID 1808 wrote to memory of 1100 N/A C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe
PID 1808 wrote to memory of 1100 N/A C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe
PID 1808 wrote to memory of 1100 N/A C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe

Processes

C:\Users\Admin\AppData\Local\Temp\91ed0d89cfea28fa7889128593cb541b3da9088cf5ea5b8b09047f765b275d9f.exe

"C:\Users\Admin\AppData\Local\Temp\91ed0d89cfea28fa7889128593cb541b3da9088cf5ea5b8b09047f765b275d9f.exe"

C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe

"C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe"

C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe

/scomma "C:\Users\Admin\AppData\Local\Temp\fwzjTKh8w9.ini"

C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe

/scomma "C:\Users\Admin\AppData\Local\Temp\jQCDLrIz9J.ini"

Network

N/A

Files

memory/1428-54-0x0000000074DE1000-0x0000000074DE3000-memory.dmp

memory/1428-56-0x0000000000830000-0x0000000000831000-memory.dmp

memory/1428-55-0x00000000741D0000-0x000000007477B000-memory.dmp

memory/1428-57-0x00000000741D0000-0x000000007477B000-memory.dmp

memory/1808-58-0x0000000000400000-0x0000000000442000-memory.dmp

memory/1780-64-0x0000000000400000-0x0000000000453000-memory.dmp

memory/1780-67-0x0000000000400000-0x0000000000453000-memory.dmp

memory/1780-69-0x0000000000400000-0x0000000000453000-memory.dmp

memory/1780-70-0x0000000000400000-0x0000000000453000-memory.dmp

memory/1780-71-0x0000000000400000-0x0000000000453000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2022-03-12 07:59

Reported

2022-03-12 09:13

Platform

win10v2004-20220310-en

Max time kernel

127s

Max time network

155s

Command Line

"C:\Users\Admin\AppData\Local\Temp\91ed0d89cfea28fa7889128593cb541b3da9088cf5ea5b8b09047f765b275d9f.exe"

Signatures

Processes

C:\Users\Admin\AppData\Local\Temp\91ed0d89cfea28fa7889128593cb541b3da9088cf5ea5b8b09047f765b275d9f.exe

"C:\Users\Admin\AppData\Local\Temp\91ed0d89cfea28fa7889128593cb541b3da9088cf5ea5b8b09047f765b275d9f.exe"

C:\Windows\SysWOW64\fondue.exe

"C:\Windows\system32\fondue.exe" /enable-feature:NetFx3 /caller-name:mscoreei.dll

C:\Windows\system32\FonDUE.EXE

"C:\Windows\sysnative\FonDUE.EXE" /enable-feature:NetFx3 /caller-name:mscoreei.dll

Network

Country Destination Domain Proto
NL 8.238.21.254:80 tcp
NL 8.238.21.254:80 tcp
US 104.18.21.226:80 tcp
US 104.18.20.226:80 tcp

Files

N/A