Malware Analysis Report

2025-01-18 16:49

Sample ID 221003-cvfc5scbd8
Target 91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88
SHA256 91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88
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

91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88

Threat Level: Known bad

The file 91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88 was found to be: Known bad.

Malicious Activity Summary

isrstealer spyware stealer trojan upx

ISR Stealer payload

ISR Stealer

UPX packed file

Reads user/profile data of web browsers

Suspicious use of SetThreadContext

AutoIT Executable

Enumerates physical storage devices

Suspicious use of SetWindowsHookEx

Suspicious use of SendNotifyMessage

Suspicious use of WriteProcessMemory

Suspicious use of FindShellTrayWindow

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2022-10-03 02:23

Signatures

AutoIT Executable

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

Analysis: behavioral1

Detonation Overview

Submitted

2022-10-03 02:23

Reported

2022-10-03 07:42

Platform

win7-20220812-en

Max time kernel

38s

Max time network

45s

Command Line

"C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.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

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

Enumerates physical storage devices

Suspicious use of SetWindowsHookEx

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 1488 wrote to memory of 112 N/A C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe
PID 1488 wrote to memory of 112 N/A C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe
PID 1488 wrote to memory of 112 N/A C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe
PID 1488 wrote to memory of 112 N/A C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe
PID 1488 wrote to memory of 112 N/A C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe
PID 1488 wrote to memory of 112 N/A C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe
PID 1488 wrote to memory of 112 N/A C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe
PID 112 wrote to memory of 1688 N/A C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe
PID 112 wrote to memory of 1688 N/A C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe
PID 112 wrote to memory of 1688 N/A C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe
PID 112 wrote to memory of 1688 N/A C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe
PID 112 wrote to memory of 1688 N/A C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe
PID 112 wrote to memory of 1688 N/A C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe
PID 112 wrote to memory of 1688 N/A C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe
PID 112 wrote to memory of 1688 N/A C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe
PID 112 wrote to memory of 1688 N/A C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe

Processes

C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe

"C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe"

C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe

"C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe"

C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe

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

Network

N/A

Files

memory/1488-54-0x0000000076681000-0x0000000076683000-memory.dmp

memory/112-55-0x0000000000400000-0x0000000000432000-memory.dmp

memory/112-56-0x0000000000400000-0x0000000000432000-memory.dmp

memory/112-58-0x0000000000400000-0x0000000000432000-memory.dmp

memory/112-60-0x0000000000000000-mapping.dmp

memory/112-61-0x0000000000400000-0x0000000000432000-memory.dmp

memory/1688-64-0x0000000000400000-0x0000000000453000-memory.dmp

memory/1688-65-0x00000000004512E0-mapping.dmp

memory/1688-68-0x0000000000400000-0x0000000000453000-memory.dmp

memory/1688-69-0x0000000000400000-0x0000000000453000-memory.dmp

memory/112-70-0x0000000000400000-0x0000000000432000-memory.dmp

memory/1688-71-0x0000000000400000-0x0000000000453000-memory.dmp

memory/1688-72-0x0000000000400000-0x0000000000453000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2022-10-03 02:23

Reported

2022-10-03 07:41

Platform

win10v2004-20220901-en

Max time kernel

94s

Max time network

131s

Command Line

"C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.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

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

Reads user/profile data of web browsers

spyware stealer

Enumerates physical storage devices

Suspicious use of SetWindowsHookEx

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 3448 wrote to memory of 5092 N/A C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe
PID 3448 wrote to memory of 5092 N/A C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe
PID 3448 wrote to memory of 5092 N/A C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe
PID 3448 wrote to memory of 5092 N/A C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe
PID 3448 wrote to memory of 5092 N/A C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe
PID 3448 wrote to memory of 5092 N/A C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe
PID 5092 wrote to memory of 1728 N/A C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe
PID 5092 wrote to memory of 1728 N/A C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe
PID 5092 wrote to memory of 1728 N/A C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe
PID 5092 wrote to memory of 1728 N/A C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe
PID 5092 wrote to memory of 1728 N/A C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe
PID 5092 wrote to memory of 1728 N/A C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe
PID 5092 wrote to memory of 1728 N/A C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe
PID 5092 wrote to memory of 1728 N/A C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe

Processes

C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe

"C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe"

C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe

"C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe"

C:\Users\Admin\AppData\Local\Temp\91e3e9cc577255c3515aabc14fc485521098421bc7d77c9bab64fbe9c7b5ab88.exe

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

Network

Country Destination Domain Proto
US 20.42.72.131:443 tcp
BE 67.24.25.254:80 tcp
BE 67.24.25.254:80 tcp
BE 67.24.25.254:80 tcp
US 8.8.8.8:53 106.89.54.20.in-addr.arpa udp

Files

memory/5092-132-0x0000000000000000-mapping.dmp

memory/5092-133-0x0000000000400000-0x0000000000432000-memory.dmp

memory/1728-136-0x0000000000000000-mapping.dmp

memory/1728-137-0x0000000000400000-0x0000000000453000-memory.dmp

memory/5092-140-0x0000000000400000-0x0000000000432000-memory.dmp

memory/1728-139-0x0000000000400000-0x0000000000453000-memory.dmp

memory/1728-141-0x0000000000400000-0x0000000000453000-memory.dmp

memory/1728-142-0x0000000000400000-0x0000000000453000-memory.dmp