Malware Analysis Report

2025-01-18 16:49

Sample ID 221003-kgb3kaggbr
Target af2880ecae68d9343387f01808dbccc39ce14ec8df607a8361783346d893ae82
SHA256 af2880ecae68d9343387f01808dbccc39ce14ec8df607a8361783346d893ae82
Tags
isrstealer spyware stealer trojan
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

af2880ecae68d9343387f01808dbccc39ce14ec8df607a8361783346d893ae82

Threat Level: Known bad

The file af2880ecae68d9343387f01808dbccc39ce14ec8df607a8361783346d893ae82 was found to be: Known bad.

Malicious Activity Summary

isrstealer spyware stealer trojan

ISR Stealer

ISR Stealer payload

Reads data files stored by FTP clients

Reads user/profile data of web browsers

Suspicious use of SetThreadContext

Enumerates physical storage devices

Suspicious use of WriteProcessMemory

Modifies registry class

Suspicious behavior: EnumeratesProcesses

Suspicious use of SetWindowsHookEx

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2022-10-03 08:33

Signatures

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2022-10-03 08:33

Reported

2022-10-04 20:01

Platform

win7-20220812-en

Max time kernel

32s

Max time network

46s

Command Line

"C:\Users\Admin\AppData\Local\Temp\af2880ecae68d9343387f01808dbccc39ce14ec8df607a8361783346d893ae82.exe"

Signatures

ISR Stealer

trojan stealer isrstealer

ISR Stealer payload

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

Reads data files stored by FTP clients

spyware stealer

Reads user/profile data of web browsers

spyware stealer

Enumerates physical storage devices

Modifies registry class

Description Indicator Process Target
Key created \REGISTRY\MACHINE\SOFTWARE\Classes\MIME\Database C:\Users\Admin\AppData\Local\Temp\af2880ecae68d9343387f01808dbccc39ce14ec8df607a8361783346d893ae82.exe N/A
Key created \REGISTRY\MACHINE\SOFTWARE\Classes\MIME\Database\Charset C:\Users\Admin\AppData\Local\Temp\af2880ecae68d9343387f01808dbccc39ce14ec8df607a8361783346d893ae82.exe N/A
Key created \REGISTRY\MACHINE\SOFTWARE\Classes\MIME\Database\Codepage C:\Users\Admin\AppData\Local\Temp\af2880ecae68d9343387f01808dbccc39ce14ec8df607a8361783346d893ae82.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2020 wrote to memory of 908 N/A C:\Users\Admin\AppData\Local\Temp\af2880ecae68d9343387f01808dbccc39ce14ec8df607a8361783346d893ae82.exe C:\Users\Admin\AppData\Local\Temp\af2880ecae68d9343387f01808dbccc39ce14ec8df607a8361783346d893ae82.exe
PID 2020 wrote to memory of 908 N/A C:\Users\Admin\AppData\Local\Temp\af2880ecae68d9343387f01808dbccc39ce14ec8df607a8361783346d893ae82.exe C:\Users\Admin\AppData\Local\Temp\af2880ecae68d9343387f01808dbccc39ce14ec8df607a8361783346d893ae82.exe
PID 2020 wrote to memory of 908 N/A C:\Users\Admin\AppData\Local\Temp\af2880ecae68d9343387f01808dbccc39ce14ec8df607a8361783346d893ae82.exe C:\Users\Admin\AppData\Local\Temp\af2880ecae68d9343387f01808dbccc39ce14ec8df607a8361783346d893ae82.exe
PID 2020 wrote to memory of 908 N/A C:\Users\Admin\AppData\Local\Temp\af2880ecae68d9343387f01808dbccc39ce14ec8df607a8361783346d893ae82.exe C:\Users\Admin\AppData\Local\Temp\af2880ecae68d9343387f01808dbccc39ce14ec8df607a8361783346d893ae82.exe
PID 2020 wrote to memory of 908 N/A C:\Users\Admin\AppData\Local\Temp\af2880ecae68d9343387f01808dbccc39ce14ec8df607a8361783346d893ae82.exe C:\Users\Admin\AppData\Local\Temp\af2880ecae68d9343387f01808dbccc39ce14ec8df607a8361783346d893ae82.exe
PID 2020 wrote to memory of 908 N/A C:\Users\Admin\AppData\Local\Temp\af2880ecae68d9343387f01808dbccc39ce14ec8df607a8361783346d893ae82.exe C:\Users\Admin\AppData\Local\Temp\af2880ecae68d9343387f01808dbccc39ce14ec8df607a8361783346d893ae82.exe
PID 2020 wrote to memory of 908 N/A C:\Users\Admin\AppData\Local\Temp\af2880ecae68d9343387f01808dbccc39ce14ec8df607a8361783346d893ae82.exe C:\Users\Admin\AppData\Local\Temp\af2880ecae68d9343387f01808dbccc39ce14ec8df607a8361783346d893ae82.exe
PID 2020 wrote to memory of 908 N/A C:\Users\Admin\AppData\Local\Temp\af2880ecae68d9343387f01808dbccc39ce14ec8df607a8361783346d893ae82.exe C:\Users\Admin\AppData\Local\Temp\af2880ecae68d9343387f01808dbccc39ce14ec8df607a8361783346d893ae82.exe
PID 2020 wrote to memory of 908 N/A C:\Users\Admin\AppData\Local\Temp\af2880ecae68d9343387f01808dbccc39ce14ec8df607a8361783346d893ae82.exe C:\Users\Admin\AppData\Local\Temp\af2880ecae68d9343387f01808dbccc39ce14ec8df607a8361783346d893ae82.exe

Processes

C:\Users\Admin\AppData\Local\Temp\af2880ecae68d9343387f01808dbccc39ce14ec8df607a8361783346d893ae82.exe

"C:\Users\Admin\AppData\Local\Temp\af2880ecae68d9343387f01808dbccc39ce14ec8df607a8361783346d893ae82.exe"

C:\Users\Admin\AppData\Local\Temp\af2880ecae68d9343387f01808dbccc39ce14ec8df607a8361783346d893ae82.exe

"C:\Users\Admin\AppData\Local\Temp\af2880ecae68d9343387f01808dbccc39ce14ec8df607a8361783346d893ae82.exe"

Network

Country Destination Domain Proto
US 8.8.8.8:53 smtp.gmail.com udp
US 142.250.27.109:465 smtp.gmail.com tcp
US 72.21.91.29:80 tcp

Files

memory/908-56-0x0000000000400000-0x0000000000414000-memory.dmp

memory/908-57-0x00000000004011F0-mapping.dmp

memory/908-61-0x00000000751A1000-0x00000000751A3000-memory.dmp

memory/908-62-0x0000000000400000-0x0000000000414000-memory.dmp

memory/908-63-0x0000000000400000-0x0000000000414000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2022-10-03 08:33

Reported

2022-10-04 20:01

Platform

win10v2004-20220812-en

Max time kernel

145s

Max time network

158s

Command Line

"C:\Users\Admin\AppData\Local\Temp\af2880ecae68d9343387f01808dbccc39ce14ec8df607a8361783346d893ae82.exe"

Signatures

ISR Stealer

trojan stealer isrstealer

ISR Stealer payload

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

Reads data files stored by FTP clients

spyware stealer

Reads user/profile data of web browsers

spyware stealer

Enumerates physical storage devices

Modifies registry class

Description Indicator Process Target
Key created \REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000_Classes\MIME\Database C:\Users\Admin\AppData\Local\Temp\af2880ecae68d9343387f01808dbccc39ce14ec8df607a8361783346d893ae82.exe N/A
Key created \REGISTRY\MACHINE\SOFTWARE\Classes\MIME\Database\Charset C:\Users\Admin\AppData\Local\Temp\af2880ecae68d9343387f01808dbccc39ce14ec8df607a8361783346d893ae82.exe N/A
Key created \REGISTRY\MACHINE\SOFTWARE\Classes\MIME\Database\Codepage C:\Users\Admin\AppData\Local\Temp\af2880ecae68d9343387f01808dbccc39ce14ec8df607a8361783346d893ae82.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 4384 wrote to memory of 3592 N/A C:\Users\Admin\AppData\Local\Temp\af2880ecae68d9343387f01808dbccc39ce14ec8df607a8361783346d893ae82.exe C:\Users\Admin\AppData\Local\Temp\af2880ecae68d9343387f01808dbccc39ce14ec8df607a8361783346d893ae82.exe
PID 4384 wrote to memory of 3592 N/A C:\Users\Admin\AppData\Local\Temp\af2880ecae68d9343387f01808dbccc39ce14ec8df607a8361783346d893ae82.exe C:\Users\Admin\AppData\Local\Temp\af2880ecae68d9343387f01808dbccc39ce14ec8df607a8361783346d893ae82.exe
PID 4384 wrote to memory of 3592 N/A C:\Users\Admin\AppData\Local\Temp\af2880ecae68d9343387f01808dbccc39ce14ec8df607a8361783346d893ae82.exe C:\Users\Admin\AppData\Local\Temp\af2880ecae68d9343387f01808dbccc39ce14ec8df607a8361783346d893ae82.exe
PID 4384 wrote to memory of 3592 N/A C:\Users\Admin\AppData\Local\Temp\af2880ecae68d9343387f01808dbccc39ce14ec8df607a8361783346d893ae82.exe C:\Users\Admin\AppData\Local\Temp\af2880ecae68d9343387f01808dbccc39ce14ec8df607a8361783346d893ae82.exe
PID 4384 wrote to memory of 3592 N/A C:\Users\Admin\AppData\Local\Temp\af2880ecae68d9343387f01808dbccc39ce14ec8df607a8361783346d893ae82.exe C:\Users\Admin\AppData\Local\Temp\af2880ecae68d9343387f01808dbccc39ce14ec8df607a8361783346d893ae82.exe
PID 4384 wrote to memory of 3592 N/A C:\Users\Admin\AppData\Local\Temp\af2880ecae68d9343387f01808dbccc39ce14ec8df607a8361783346d893ae82.exe C:\Users\Admin\AppData\Local\Temp\af2880ecae68d9343387f01808dbccc39ce14ec8df607a8361783346d893ae82.exe
PID 4384 wrote to memory of 3592 N/A C:\Users\Admin\AppData\Local\Temp\af2880ecae68d9343387f01808dbccc39ce14ec8df607a8361783346d893ae82.exe C:\Users\Admin\AppData\Local\Temp\af2880ecae68d9343387f01808dbccc39ce14ec8df607a8361783346d893ae82.exe
PID 4384 wrote to memory of 3592 N/A C:\Users\Admin\AppData\Local\Temp\af2880ecae68d9343387f01808dbccc39ce14ec8df607a8361783346d893ae82.exe C:\Users\Admin\AppData\Local\Temp\af2880ecae68d9343387f01808dbccc39ce14ec8df607a8361783346d893ae82.exe

Processes

C:\Users\Admin\AppData\Local\Temp\af2880ecae68d9343387f01808dbccc39ce14ec8df607a8361783346d893ae82.exe

"C:\Users\Admin\AppData\Local\Temp\af2880ecae68d9343387f01808dbccc39ce14ec8df607a8361783346d893ae82.exe"

C:\Users\Admin\AppData\Local\Temp\af2880ecae68d9343387f01808dbccc39ce14ec8df607a8361783346d893ae82.exe

"C:\Users\Admin\AppData\Local\Temp\af2880ecae68d9343387f01808dbccc39ce14ec8df607a8361783346d893ae82.exe"

Network

Country Destination Domain Proto
US 93.184.221.240:80 tcp
US 8.8.8.8:53 smtp.gmail.com udp
US 142.250.27.108:465 smtp.gmail.com tcp
NL 8.238.23.254:80 tcp
NL 8.238.23.254:80 tcp
US 8.8.8.8:53 164.2.77.40.in-addr.arpa udp
US 93.184.221.240:80 tcp
US 93.184.221.240:80 tcp
DE 51.116.253.170:443 tcp
US 93.184.220.29:80 tcp
US 93.184.221.240:80 tcp
US 8.8.8.8:53 151.122.125.40.in-addr.arpa udp

Files

memory/3592-134-0x0000000000000000-mapping.dmp

memory/3592-135-0x0000000000400000-0x0000000000414000-memory.dmp

memory/3592-139-0x0000000000400000-0x0000000000414000-memory.dmp

memory/3592-140-0x0000000000400000-0x0000000000414000-memory.dmp