Malware Analysis Report

2025-01-18 16:44

Sample ID 221020-y4fk6adcd4
Target 4b4138636d2afe18abff9cde7681abb2c6c16bdf1e21d665eb1fa7b6f6f1b447
SHA256 4b4138636d2afe18abff9cde7681abb2c6c16bdf1e21d665eb1fa7b6f6f1b447
Tags
isrstealer collection 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

4b4138636d2afe18abff9cde7681abb2c6c16bdf1e21d665eb1fa7b6f6f1b447

Threat Level: Known bad

The file 4b4138636d2afe18abff9cde7681abb2c6c16bdf1e21d665eb1fa7b6f6f1b447 was found to be: Known bad.

Malicious Activity Summary

isrstealer collection stealer trojan upx

ISR Stealer

ISR Stealer payload

NirSoft MailPassView

Nirsoft

UPX packed file

Accesses Microsoft Outlook accounts

Suspicious use of SetThreadContext

Suspicious use of SetWindowsHookEx

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2022-10-20 20:20

Signatures

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2022-10-20 20:20

Reported

2022-10-20 23:18

Platform

win7-20220901-en

Max time kernel

76s

Max time network

141s

Command Line

"C:\Users\Admin\AppData\Local\Temp\4b4138636d2afe18abff9cde7681abb2c6c16bdf1e21d665eb1fa7b6f6f1b447.exe"

Signatures

ISR Stealer

trojan stealer isrstealer

ISR Stealer payload

Description Indicator Process Target
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NirSoft MailPassView

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

Nirsoft

Description Indicator Process Target
N/A N/A N/A N/A
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UPX packed file

upx
Description Indicator Process Target
N/A N/A N/A N/A
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Accesses Microsoft Outlook accounts

collection
Description Indicator Process Target
Key opened \REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts C:\Windows\SysWOW64\svchost.exe N/A

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 1468 set thread context of 1388 N/A C:\Users\Admin\AppData\Local\Temp\4b4138636d2afe18abff9cde7681abb2c6c16bdf1e21d665eb1fa7b6f6f1b447.exe C:\Windows\SysWOW64\svchost.exe
PID 1388 set thread context of 464 N/A C:\Windows\SysWOW64\svchost.exe C:\Windows\SysWOW64\svchost.exe
PID 1388 set thread context of 436 N/A C:\Windows\SysWOW64\svchost.exe C:\Windows\SysWOW64\svchost.exe

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\4b4138636d2afe18abff9cde7681abb2c6c16bdf1e21d665eb1fa7b6f6f1b447.exe N/A

Suspicious use of SetWindowsHookEx

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\svchost.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 1468 wrote to memory of 1388 N/A C:\Users\Admin\AppData\Local\Temp\4b4138636d2afe18abff9cde7681abb2c6c16bdf1e21d665eb1fa7b6f6f1b447.exe C:\Windows\SysWOW64\svchost.exe
PID 1468 wrote to memory of 1388 N/A C:\Users\Admin\AppData\Local\Temp\4b4138636d2afe18abff9cde7681abb2c6c16bdf1e21d665eb1fa7b6f6f1b447.exe C:\Windows\SysWOW64\svchost.exe
PID 1468 wrote to memory of 1388 N/A C:\Users\Admin\AppData\Local\Temp\4b4138636d2afe18abff9cde7681abb2c6c16bdf1e21d665eb1fa7b6f6f1b447.exe C:\Windows\SysWOW64\svchost.exe
PID 1468 wrote to memory of 1388 N/A C:\Users\Admin\AppData\Local\Temp\4b4138636d2afe18abff9cde7681abb2c6c16bdf1e21d665eb1fa7b6f6f1b447.exe C:\Windows\SysWOW64\svchost.exe
PID 1468 wrote to memory of 1388 N/A C:\Users\Admin\AppData\Local\Temp\4b4138636d2afe18abff9cde7681abb2c6c16bdf1e21d665eb1fa7b6f6f1b447.exe C:\Windows\SysWOW64\svchost.exe
PID 1468 wrote to memory of 1388 N/A C:\Users\Admin\AppData\Local\Temp\4b4138636d2afe18abff9cde7681abb2c6c16bdf1e21d665eb1fa7b6f6f1b447.exe C:\Windows\SysWOW64\svchost.exe
PID 1468 wrote to memory of 1388 N/A C:\Users\Admin\AppData\Local\Temp\4b4138636d2afe18abff9cde7681abb2c6c16bdf1e21d665eb1fa7b6f6f1b447.exe C:\Windows\SysWOW64\svchost.exe
PID 1468 wrote to memory of 1388 N/A C:\Users\Admin\AppData\Local\Temp\4b4138636d2afe18abff9cde7681abb2c6c16bdf1e21d665eb1fa7b6f6f1b447.exe C:\Windows\SysWOW64\svchost.exe
PID 1388 wrote to memory of 464 N/A C:\Windows\SysWOW64\svchost.exe C:\Windows\SysWOW64\svchost.exe
PID 1388 wrote to memory of 464 N/A C:\Windows\SysWOW64\svchost.exe C:\Windows\SysWOW64\svchost.exe
PID 1388 wrote to memory of 464 N/A C:\Windows\SysWOW64\svchost.exe C:\Windows\SysWOW64\svchost.exe
PID 1388 wrote to memory of 464 N/A C:\Windows\SysWOW64\svchost.exe C:\Windows\SysWOW64\svchost.exe
PID 1388 wrote to memory of 464 N/A C:\Windows\SysWOW64\svchost.exe C:\Windows\SysWOW64\svchost.exe
PID 1388 wrote to memory of 464 N/A C:\Windows\SysWOW64\svchost.exe C:\Windows\SysWOW64\svchost.exe
PID 1388 wrote to memory of 464 N/A C:\Windows\SysWOW64\svchost.exe C:\Windows\SysWOW64\svchost.exe
PID 1388 wrote to memory of 464 N/A C:\Windows\SysWOW64\svchost.exe C:\Windows\SysWOW64\svchost.exe
PID 1388 wrote to memory of 464 N/A C:\Windows\SysWOW64\svchost.exe C:\Windows\SysWOW64\svchost.exe
PID 1388 wrote to memory of 436 N/A C:\Windows\SysWOW64\svchost.exe C:\Windows\SysWOW64\svchost.exe
PID 1388 wrote to memory of 436 N/A C:\Windows\SysWOW64\svchost.exe C:\Windows\SysWOW64\svchost.exe
PID 1388 wrote to memory of 436 N/A C:\Windows\SysWOW64\svchost.exe C:\Windows\SysWOW64\svchost.exe
PID 1388 wrote to memory of 436 N/A C:\Windows\SysWOW64\svchost.exe C:\Windows\SysWOW64\svchost.exe
PID 1388 wrote to memory of 436 N/A C:\Windows\SysWOW64\svchost.exe C:\Windows\SysWOW64\svchost.exe
PID 1388 wrote to memory of 436 N/A C:\Windows\SysWOW64\svchost.exe C:\Windows\SysWOW64\svchost.exe
PID 1388 wrote to memory of 436 N/A C:\Windows\SysWOW64\svchost.exe C:\Windows\SysWOW64\svchost.exe
PID 1388 wrote to memory of 436 N/A C:\Windows\SysWOW64\svchost.exe C:\Windows\SysWOW64\svchost.exe
PID 1388 wrote to memory of 436 N/A C:\Windows\SysWOW64\svchost.exe C:\Windows\SysWOW64\svchost.exe

Processes

C:\Users\Admin\AppData\Local\Temp\4b4138636d2afe18abff9cde7681abb2c6c16bdf1e21d665eb1fa7b6f6f1b447.exe

"C:\Users\Admin\AppData\Local\Temp\4b4138636d2afe18abff9cde7681abb2c6c16bdf1e21d665eb1fa7b6f6f1b447.exe"

C:\Windows\SysWOW64\svchost.exe

"C:\Windows\system32\svchost.exe"

C:\Windows\SysWOW64\svchost.exe

/scomma "C:\Users\Admin\AppData\Local\Temp\Q4RvMJrOqJ.ini"

C:\Windows\SysWOW64\svchost.exe

/scomma "C:\Users\Admin\AppData\Local\Temp\zXCCK3IEcJ.ini"

Network

Country Destination Domain Proto
US 8.8.8.8:53 deman.netai.net udp
US 153.92.0.100:80 deman.netai.net tcp
US 8.8.8.8:53 www.000webhost.com udp
US 104.19.185.120:443 www.000webhost.com tcp

Files

memory/1468-54-0x0000000076BA1000-0x0000000076BA3000-memory.dmp

memory/1468-55-0x0000000074F30000-0x00000000754DB000-memory.dmp

memory/1468-56-0x0000000074F30000-0x00000000754DB000-memory.dmp

memory/1388-57-0x0000000000400000-0x0000000000442000-memory.dmp

memory/1388-58-0x0000000000400000-0x0000000000442000-memory.dmp

memory/1388-60-0x0000000000400000-0x0000000000442000-memory.dmp

memory/1388-62-0x0000000000400000-0x0000000000442000-memory.dmp

memory/1388-63-0x0000000000401180-mapping.dmp

memory/1468-68-0x0000000074F30000-0x00000000754DB000-memory.dmp

memory/464-69-0x0000000000400000-0x0000000000453000-memory.dmp

memory/464-70-0x00000000004512E0-mapping.dmp

memory/464-73-0x0000000000400000-0x0000000000453000-memory.dmp

memory/1388-74-0x0000000000400000-0x0000000000442000-memory.dmp

memory/464-75-0x0000000000400000-0x0000000000453000-memory.dmp

memory/464-76-0x0000000000400000-0x0000000000453000-memory.dmp

memory/464-77-0x0000000000400000-0x0000000000453000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\Q4RvMJrOqJ.ini

MD5 d1ea279fb5559c020a1b4137dc4de237
SHA1 db6f8988af46b56216a6f0daf95ab8c9bdb57400
SHA256 fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba
SHA512 720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

memory/436-80-0x0000000000400000-0x000000000041F000-memory.dmp

memory/436-81-0x000000000041C410-mapping.dmp

memory/436-84-0x0000000000400000-0x000000000041F000-memory.dmp

memory/436-85-0x0000000000400000-0x000000000041F000-memory.dmp

memory/1388-86-0x0000000000400000-0x0000000000442000-memory.dmp

memory/436-87-0x0000000000400000-0x000000000041F000-memory.dmp

memory/436-88-0x0000000000400000-0x000000000041F000-memory.dmp

memory/1388-89-0x0000000000400000-0x0000000000442000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2022-10-20 20:20

Reported

2022-10-20 23:19

Platform

win10v2004-20220812-en

Max time kernel

143s

Max time network

169s

Command Line

"C:\Users\Admin\AppData\Local\Temp\4b4138636d2afe18abff9cde7681abb2c6c16bdf1e21d665eb1fa7b6f6f1b447.exe"

Signatures

ISR Stealer

trojan stealer isrstealer

ISR Stealer payload

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

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 4412 set thread context of 3364 N/A C:\Users\Admin\AppData\Local\Temp\4b4138636d2afe18abff9cde7681abb2c6c16bdf1e21d665eb1fa7b6f6f1b447.exe C:\Windows\SysWOW64\svchost.exe

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\4b4138636d2afe18abff9cde7681abb2c6c16bdf1e21d665eb1fa7b6f6f1b447.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\4b4138636d2afe18abff9cde7681abb2c6c16bdf1e21d665eb1fa7b6f6f1b447.exe

"C:\Users\Admin\AppData\Local\Temp\4b4138636d2afe18abff9cde7681abb2c6c16bdf1e21d665eb1fa7b6f6f1b447.exe"

C:\Windows\SysWOW64\svchost.exe

"C:\Windows\system32\svchost.exe"

Network

Country Destination Domain Proto
US 209.197.3.8:80 tcp
US 209.197.3.8:80 tcp
US 20.189.173.10:443 tcp
US 8.253.208.113:80 tcp
US 8.253.208.113:80 tcp
US 209.197.3.8:80 tcp
US 8.8.8.8:53 176.122.125.40.in-addr.arpa udp
US 8.8.8.8:53 a.2.0.0.0.0.0.0.0.0.0.0.0.0.0.0.3.0.0.0.5.0.8.0.0.3.0.1.3.0.6.2.ip6.arpa udp

Files

memory/4412-132-0x0000000074880000-0x0000000074E31000-memory.dmp

memory/4412-133-0x0000000074880000-0x0000000074E31000-memory.dmp

memory/3364-134-0x0000000000000000-mapping.dmp

memory/3364-136-0x0000000000600000-0x0000000000642000-memory.dmp

memory/4412-138-0x0000000074880000-0x0000000074E31000-memory.dmp