Malware Analysis Report

2025-01-18 16:46

Sample ID 220315-q8aayaccd8
Target fb476e8cd10587ebb49487f1d95165fc1a3065038edcea30c725d9ad1ab015a1
SHA256 fb476e8cd10587ebb49487f1d95165fc1a3065038edcea30c725d9ad1ab015a1
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

fb476e8cd10587ebb49487f1d95165fc1a3065038edcea30c725d9ad1ab015a1

Threat Level: Known bad

The file fb476e8cd10587ebb49487f1d95165fc1a3065038edcea30c725d9ad1ab015a1 was found to be: Known bad.

Malicious Activity Summary

isrstealer collection spyware stealer trojan upx

ISR Stealer

ISR Stealer Payload

Nirsoft

NirSoft WebBrowserPassView

NirSoft MailPassView

UPX packed file

Executes dropped EXE

Loads dropped DLL

Reads user/profile data of web browsers

Reads data files stored by FTP clients

Accesses Microsoft Outlook accounts

Suspicious use of SetThreadContext

Enumerates physical storage devices

Suspicious use of AdjustPrivilegeToken

Suspicious use of SetWindowsHookEx

Suspicious use of WriteProcessMemory

Suspicious behavior: EnumeratesProcesses

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2022-03-15 13:55

Signatures

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2022-03-15 13:55

Reported

2022-03-15 13:59

Platform

win7-20220311-en

Max time kernel

4294180s

Max time network

143s

Command Line

"C:\Users\Admin\AppData\Local\Temp\fb476e8cd10587ebb49487f1d95165fc1a3065038edcea30c725d9ad1ab015a1.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

NirSoft MailPassView

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

NirSoft WebBrowserPassView

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
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

Reads data files stored by FTP clients

spyware stealer

Reads user/profile data of web browsers

spyware stealer

Accesses Microsoft Outlook accounts

collection
Description Indicator Process Target
Key opened \REGISTRY\USER\S-1-5-21-2199625441-3471261906-229485034-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts C:\Users\Admin\AppData\Local\Temp\cvtres.exe N/A

Enumerates physical storage devices

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\fb476e8cd10587ebb49487f1d95165fc1a3065038edcea30c725d9ad1ab015a1.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\cvtres.exe N/A

Suspicious use of SetWindowsHookEx

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

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 1620 wrote to memory of 1668 N/A C:\Users\Admin\AppData\Local\Temp\fb476e8cd10587ebb49487f1d95165fc1a3065038edcea30c725d9ad1ab015a1.exe C:\Users\Admin\AppData\Local\Temp\cvtres.exe
PID 1620 wrote to memory of 1668 N/A C:\Users\Admin\AppData\Local\Temp\fb476e8cd10587ebb49487f1d95165fc1a3065038edcea30c725d9ad1ab015a1.exe C:\Users\Admin\AppData\Local\Temp\cvtres.exe
PID 1620 wrote to memory of 1668 N/A C:\Users\Admin\AppData\Local\Temp\fb476e8cd10587ebb49487f1d95165fc1a3065038edcea30c725d9ad1ab015a1.exe C:\Users\Admin\AppData\Local\Temp\cvtres.exe
PID 1620 wrote to memory of 1668 N/A C:\Users\Admin\AppData\Local\Temp\fb476e8cd10587ebb49487f1d95165fc1a3065038edcea30c725d9ad1ab015a1.exe C:\Users\Admin\AppData\Local\Temp\cvtres.exe
PID 1620 wrote to memory of 1668 N/A C:\Users\Admin\AppData\Local\Temp\fb476e8cd10587ebb49487f1d95165fc1a3065038edcea30c725d9ad1ab015a1.exe C:\Users\Admin\AppData\Local\Temp\cvtres.exe
PID 1620 wrote to memory of 1668 N/A C:\Users\Admin\AppData\Local\Temp\fb476e8cd10587ebb49487f1d95165fc1a3065038edcea30c725d9ad1ab015a1.exe C:\Users\Admin\AppData\Local\Temp\cvtres.exe
PID 1620 wrote to memory of 1668 N/A C:\Users\Admin\AppData\Local\Temp\fb476e8cd10587ebb49487f1d95165fc1a3065038edcea30c725d9ad1ab015a1.exe C:\Users\Admin\AppData\Local\Temp\cvtres.exe
PID 1620 wrote to memory of 1668 N/A C:\Users\Admin\AppData\Local\Temp\fb476e8cd10587ebb49487f1d95165fc1a3065038edcea30c725d9ad1ab015a1.exe C:\Users\Admin\AppData\Local\Temp\cvtres.exe
PID 1668 wrote to memory of 920 N/A C:\Users\Admin\AppData\Local\Temp\cvtres.exe C:\Users\Admin\AppData\Local\Temp\cvtres.exe
PID 1668 wrote to memory of 920 N/A C:\Users\Admin\AppData\Local\Temp\cvtres.exe C:\Users\Admin\AppData\Local\Temp\cvtres.exe
PID 1668 wrote to memory of 920 N/A C:\Users\Admin\AppData\Local\Temp\cvtres.exe C:\Users\Admin\AppData\Local\Temp\cvtres.exe
PID 1668 wrote to memory of 920 N/A C:\Users\Admin\AppData\Local\Temp\cvtres.exe C:\Users\Admin\AppData\Local\Temp\cvtres.exe
PID 1668 wrote to memory of 920 N/A C:\Users\Admin\AppData\Local\Temp\cvtres.exe C:\Users\Admin\AppData\Local\Temp\cvtres.exe
PID 1668 wrote to memory of 920 N/A C:\Users\Admin\AppData\Local\Temp\cvtres.exe C:\Users\Admin\AppData\Local\Temp\cvtres.exe
PID 1668 wrote to memory of 920 N/A C:\Users\Admin\AppData\Local\Temp\cvtres.exe C:\Users\Admin\AppData\Local\Temp\cvtres.exe
PID 1668 wrote to memory of 920 N/A C:\Users\Admin\AppData\Local\Temp\cvtres.exe C:\Users\Admin\AppData\Local\Temp\cvtres.exe
PID 1668 wrote to memory of 920 N/A C:\Users\Admin\AppData\Local\Temp\cvtres.exe C:\Users\Admin\AppData\Local\Temp\cvtres.exe
PID 1668 wrote to memory of 920 N/A C:\Users\Admin\AppData\Local\Temp\cvtres.exe C:\Users\Admin\AppData\Local\Temp\cvtres.exe
PID 1668 wrote to memory of 920 N/A C:\Users\Admin\AppData\Local\Temp\cvtres.exe C:\Users\Admin\AppData\Local\Temp\cvtres.exe
PID 1668 wrote to memory of 920 N/A C:\Users\Admin\AppData\Local\Temp\cvtres.exe C:\Users\Admin\AppData\Local\Temp\cvtres.exe
PID 920 wrote to memory of 1820 N/A C:\Users\Admin\AppData\Local\Temp\cvtres.exe C:\Users\Admin\AppData\Local\Temp\cvtres.exe
PID 920 wrote to memory of 1820 N/A C:\Users\Admin\AppData\Local\Temp\cvtres.exe C:\Users\Admin\AppData\Local\Temp\cvtres.exe
PID 920 wrote to memory of 1820 N/A C:\Users\Admin\AppData\Local\Temp\cvtres.exe C:\Users\Admin\AppData\Local\Temp\cvtres.exe
PID 920 wrote to memory of 1820 N/A C:\Users\Admin\AppData\Local\Temp\cvtres.exe C:\Users\Admin\AppData\Local\Temp\cvtres.exe
PID 920 wrote to memory of 1820 N/A C:\Users\Admin\AppData\Local\Temp\cvtres.exe C:\Users\Admin\AppData\Local\Temp\cvtres.exe
PID 920 wrote to memory of 1820 N/A C:\Users\Admin\AppData\Local\Temp\cvtres.exe C:\Users\Admin\AppData\Local\Temp\cvtres.exe
PID 920 wrote to memory of 364 N/A C:\Users\Admin\AppData\Local\Temp\cvtres.exe C:\Users\Admin\AppData\Local\Temp\cvtres.exe
PID 920 wrote to memory of 364 N/A C:\Users\Admin\AppData\Local\Temp\cvtres.exe C:\Users\Admin\AppData\Local\Temp\cvtres.exe
PID 920 wrote to memory of 364 N/A C:\Users\Admin\AppData\Local\Temp\cvtres.exe C:\Users\Admin\AppData\Local\Temp\cvtres.exe
PID 920 wrote to memory of 364 N/A C:\Users\Admin\AppData\Local\Temp\cvtres.exe C:\Users\Admin\AppData\Local\Temp\cvtres.exe
PID 920 wrote to memory of 364 N/A C:\Users\Admin\AppData\Local\Temp\cvtres.exe C:\Users\Admin\AppData\Local\Temp\cvtres.exe
PID 920 wrote to memory of 364 N/A C:\Users\Admin\AppData\Local\Temp\cvtres.exe C:\Users\Admin\AppData\Local\Temp\cvtres.exe
PID 920 wrote to memory of 1136 N/A C:\Users\Admin\AppData\Local\Temp\cvtres.exe C:\Users\Admin\AppData\Local\Temp\cvtres.exe
PID 920 wrote to memory of 1136 N/A C:\Users\Admin\AppData\Local\Temp\cvtres.exe C:\Users\Admin\AppData\Local\Temp\cvtres.exe
PID 920 wrote to memory of 1136 N/A C:\Users\Admin\AppData\Local\Temp\cvtres.exe C:\Users\Admin\AppData\Local\Temp\cvtres.exe
PID 920 wrote to memory of 1136 N/A C:\Users\Admin\AppData\Local\Temp\cvtres.exe C:\Users\Admin\AppData\Local\Temp\cvtres.exe
PID 920 wrote to memory of 1136 N/A C:\Users\Admin\AppData\Local\Temp\cvtres.exe C:\Users\Admin\AppData\Local\Temp\cvtres.exe
PID 920 wrote to memory of 1136 N/A C:\Users\Admin\AppData\Local\Temp\cvtres.exe C:\Users\Admin\AppData\Local\Temp\cvtres.exe

Processes

C:\Users\Admin\AppData\Local\Temp\fb476e8cd10587ebb49487f1d95165fc1a3065038edcea30c725d9ad1ab015a1.exe

"C:\Users\Admin\AppData\Local\Temp\fb476e8cd10587ebb49487f1d95165fc1a3065038edcea30c725d9ad1ab015a1.exe"

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

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

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

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

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

"C:\Users\Admin\AppData\Local\Temp\cvtres.exe" /scomma C:\Users\Admin\AppData\Local\Temp\data.dmp

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

"C:\Users\Admin\AppData\Local\Temp\cvtres.exe" /scomma C:\Users\Admin\AppData\Local\Temp\data1.dmp

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

"C:\Users\Admin\AppData\Local\Temp\cvtres.exe" /scomma C:\Users\Admin\AppData\Local\Temp\data2.dmp

Network

Country Destination Domain Proto
US 8.8.8.8:53 www.rampymc.binhoster.com udp

Files

memory/1620-54-0x0000000075471000-0x0000000075473000-memory.dmp

\Users\Admin\AppData\Local\Temp\cvtres.exe

MD5 ed797d8dc2c92401985d162e42ffa450
SHA1 0f02fc517c7facc4baefde4fe9467fb6488ebabe
SHA256 b746362010a101cb5931bc066f0f4d3fc740c02a68c1f37fc3c8e6c87fd7cb1e
SHA512 e831a6ff987f3ef29982da16afad06938b68eddd43c234ba88d1c96a1b5547f2284baf35cbb3a5bfd75e7f0445d14daa014e0ba00b4db72c67f83f0a314c80c2

memory/1668-56-0x0000000000400000-0x0000000000470000-memory.dmp

memory/1668-58-0x0000000000400000-0x0000000000470000-memory.dmp

memory/1668-60-0x0000000000400000-0x0000000000470000-memory.dmp

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

MD5 ed797d8dc2c92401985d162e42ffa450
SHA1 0f02fc517c7facc4baefde4fe9467fb6488ebabe
SHA256 b746362010a101cb5931bc066f0f4d3fc740c02a68c1f37fc3c8e6c87fd7cb1e
SHA512 e831a6ff987f3ef29982da16afad06938b68eddd43c234ba88d1c96a1b5547f2284baf35cbb3a5bfd75e7f0445d14daa014e0ba00b4db72c67f83f0a314c80c2

memory/1668-62-0x0000000000400000-0x0000000000470000-memory.dmp

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

MD5 ed797d8dc2c92401985d162e42ffa450
SHA1 0f02fc517c7facc4baefde4fe9467fb6488ebabe
SHA256 b746362010a101cb5931bc066f0f4d3fc740c02a68c1f37fc3c8e6c87fd7cb1e
SHA512 e831a6ff987f3ef29982da16afad06938b68eddd43c234ba88d1c96a1b5547f2284baf35cbb3a5bfd75e7f0445d14daa014e0ba00b4db72c67f83f0a314c80c2

memory/920-69-0x0000000000400000-0x000000000045F000-memory.dmp

memory/920-71-0x0000000000400000-0x000000000045F000-memory.dmp

memory/920-73-0x0000000000400000-0x000000000045F000-memory.dmp

memory/920-75-0x0000000000400000-0x000000000045F000-memory.dmp

memory/920-77-0x0000000000400000-0x000000000045F000-memory.dmp

memory/920-79-0x0000000000400000-0x000000000045F000-memory.dmp

memory/920-81-0x0000000000400000-0x000000000045F000-memory.dmp

\Users\Admin\AppData\Local\Temp\cvtres.exe

MD5 ed797d8dc2c92401985d162e42ffa450
SHA1 0f02fc517c7facc4baefde4fe9467fb6488ebabe
SHA256 b746362010a101cb5931bc066f0f4d3fc740c02a68c1f37fc3c8e6c87fd7cb1e
SHA512 e831a6ff987f3ef29982da16afad06938b68eddd43c234ba88d1c96a1b5547f2284baf35cbb3a5bfd75e7f0445d14daa014e0ba00b4db72c67f83f0a314c80c2

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

MD5 ed797d8dc2c92401985d162e42ffa450
SHA1 0f02fc517c7facc4baefde4fe9467fb6488ebabe
SHA256 b746362010a101cb5931bc066f0f4d3fc740c02a68c1f37fc3c8e6c87fd7cb1e
SHA512 e831a6ff987f3ef29982da16afad06938b68eddd43c234ba88d1c96a1b5547f2284baf35cbb3a5bfd75e7f0445d14daa014e0ba00b4db72c67f83f0a314c80c2

memory/920-83-0x0000000000400000-0x000000000045F000-memory.dmp

memory/920-85-0x0000000000400000-0x000000000045F000-memory.dmp

memory/920-87-0x0000000000400000-0x000000000045F000-memory.dmp

\Users\Admin\AppData\Local\Temp\cvtres.exe

MD5 ed797d8dc2c92401985d162e42ffa450
SHA1 0f02fc517c7facc4baefde4fe9467fb6488ebabe
SHA256 b746362010a101cb5931bc066f0f4d3fc740c02a68c1f37fc3c8e6c87fd7cb1e
SHA512 e831a6ff987f3ef29982da16afad06938b68eddd43c234ba88d1c96a1b5547f2284baf35cbb3a5bfd75e7f0445d14daa014e0ba00b4db72c67f83f0a314c80c2

memory/1820-89-0x0000000000400000-0x0000000000454000-memory.dmp

memory/1620-90-0x0000000074930000-0x0000000074EDB000-memory.dmp

memory/1820-93-0x0000000000400000-0x0000000000454000-memory.dmp

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

MD5 ed797d8dc2c92401985d162e42ffa450
SHA1 0f02fc517c7facc4baefde4fe9467fb6488ebabe
SHA256 b746362010a101cb5931bc066f0f4d3fc740c02a68c1f37fc3c8e6c87fd7cb1e
SHA512 e831a6ff987f3ef29982da16afad06938b68eddd43c234ba88d1c96a1b5547f2284baf35cbb3a5bfd75e7f0445d14daa014e0ba00b4db72c67f83f0a314c80c2

memory/1620-97-0x0000000074930000-0x0000000074EDB000-memory.dmp

memory/364-98-0x0000000000400000-0x0000000000426000-memory.dmp

\Users\Admin\AppData\Local\Temp\cvtres.exe

MD5 ed797d8dc2c92401985d162e42ffa450
SHA1 0f02fc517c7facc4baefde4fe9467fb6488ebabe
SHA256 b746362010a101cb5931bc066f0f4d3fc740c02a68c1f37fc3c8e6c87fd7cb1e
SHA512 e831a6ff987f3ef29982da16afad06938b68eddd43c234ba88d1c96a1b5547f2284baf35cbb3a5bfd75e7f0445d14daa014e0ba00b4db72c67f83f0a314c80c2

memory/364-102-0x0000000000400000-0x0000000000426000-memory.dmp

memory/364-108-0x0000000000400000-0x0000000000426000-memory.dmp

memory/1136-110-0x0000000000400000-0x000000000041F000-memory.dmp

memory/1136-106-0x0000000000400000-0x000000000041F000-memory.dmp

memory/364-111-0x0000000000400000-0x0000000000426000-memory.dmp

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

MD5 ed797d8dc2c92401985d162e42ffa450
SHA1 0f02fc517c7facc4baefde4fe9467fb6488ebabe
SHA256 b746362010a101cb5931bc066f0f4d3fc740c02a68c1f37fc3c8e6c87fd7cb1e
SHA512 e831a6ff987f3ef29982da16afad06938b68eddd43c234ba88d1c96a1b5547f2284baf35cbb3a5bfd75e7f0445d14daa014e0ba00b4db72c67f83f0a314c80c2

memory/1820-101-0x0000000000400000-0x0000000000454000-memory.dmp

\Users\Admin\AppData\Local\Temp\cvtres.exe

MD5 ed797d8dc2c92401985d162e42ffa450
SHA1 0f02fc517c7facc4baefde4fe9467fb6488ebabe
SHA256 b746362010a101cb5931bc066f0f4d3fc740c02a68c1f37fc3c8e6c87fd7cb1e
SHA512 e831a6ff987f3ef29982da16afad06938b68eddd43c234ba88d1c96a1b5547f2284baf35cbb3a5bfd75e7f0445d14daa014e0ba00b4db72c67f83f0a314c80c2

memory/1620-92-0x0000000001F90000-0x0000000001F91000-memory.dmp

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

MD5 ed797d8dc2c92401985d162e42ffa450
SHA1 0f02fc517c7facc4baefde4fe9467fb6488ebabe
SHA256 b746362010a101cb5931bc066f0f4d3fc740c02a68c1f37fc3c8e6c87fd7cb1e
SHA512 e831a6ff987f3ef29982da16afad06938b68eddd43c234ba88d1c96a1b5547f2284baf35cbb3a5bfd75e7f0445d14daa014e0ba00b4db72c67f83f0a314c80c2

memory/1136-115-0x0000000000400000-0x000000000041F000-memory.dmp

memory/1136-116-0x0000000000400000-0x000000000041F000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2022-03-15 13:55

Reported

2022-03-15 13:59

Platform

win10v2004-en-20220113

Max time kernel

159s

Max time network

179s

Command Line

"C:\Users\Admin\AppData\Local\Temp\fb476e8cd10587ebb49487f1d95165fc1a3065038edcea30c725d9ad1ab015a1.exe"

Signatures

Processes

C:\Users\Admin\AppData\Local\Temp\fb476e8cd10587ebb49487f1d95165fc1a3065038edcea30c725d9ad1ab015a1.exe

"C:\Users\Admin\AppData\Local\Temp\fb476e8cd10587ebb49487f1d95165fc1a3065038edcea30c725d9ad1ab015a1.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
US 20.189.173.7:443 tcp
NL 84.53.175.122:80 tcp
NL 84.53.175.122:80 tcp
US 209.197.3.8:80 tcp
US 209.197.3.8:80 tcp
US 209.197.3.8:80 tcp
US 8.8.8.8:53 151.122.125.40.in-addr.arpa udp
US 8.8.8.8:53 crl4.digicert.com udp
US 93.184.220.29:80 crl4.digicert.com tcp
US 8.8.8.8:53 106.89.54.20.in-addr.arpa udp

Files

N/A