Malware Analysis Report

2024-10-19 10:27

Sample ID 240327-emv5qsfc8w
Target e0b8ddf70d7ab115a8bfa5b49f285a5d
SHA256 0a7d70527905957f57ef2b03eedceb93a55dfc626e6eee86bf9b7b184af1a390
Tags
isrstealer bootkit persistence spyware stealer trojan
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V15

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

0a7d70527905957f57ef2b03eedceb93a55dfc626e6eee86bf9b7b184af1a390

Threat Level: Known bad

The file e0b8ddf70d7ab115a8bfa5b49f285a5d was found to be: Known bad.

Malicious Activity Summary

isrstealer bootkit persistence spyware stealer trojan

ISR Stealer

ISR Stealer payload

Reads data files stored by FTP clients

Reads user/profile data of web browsers

Writes to the Master Boot Record (MBR)

Suspicious use of SetThreadContext

Enumerates physical storage devices

Unsigned PE

Suspicious behavior: EnumeratesProcesses

Suspicious use of SetWindowsHookEx

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-03-27 04:03

Signatures

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-03-27 04:03

Reported

2024-03-27 04:06

Platform

win7-20240319-en

Max time kernel

118s

Max time network

122s

Command Line

"C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.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

Writes to the Master Boot Record (MBR)

bootkit persistence
Description Indicator Process Target
File opened for modification \??\PhysicalDrive0 C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe N/A

Enumerates physical storage devices

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2228 wrote to memory of 2328 N/A C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe
PID 2228 wrote to memory of 2328 N/A C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe
PID 2228 wrote to memory of 2328 N/A C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe
PID 2228 wrote to memory of 2328 N/A C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe
PID 2228 wrote to memory of 2328 N/A C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe
PID 2228 wrote to memory of 2328 N/A C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe
PID 2228 wrote to memory of 2328 N/A C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe
PID 2228 wrote to memory of 2328 N/A C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe
PID 2228 wrote to memory of 2328 N/A C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe
PID 2328 wrote to memory of 2552 N/A C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe
PID 2328 wrote to memory of 2552 N/A C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe
PID 2328 wrote to memory of 2552 N/A C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe
PID 2328 wrote to memory of 2552 N/A C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe
PID 2328 wrote to memory of 2552 N/A C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe
PID 2328 wrote to memory of 2552 N/A C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe
PID 2328 wrote to memory of 2552 N/A C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe
PID 2328 wrote to memory of 2552 N/A C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe

Processes

C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe

"C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe"

C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe

"C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe"

C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe

"C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe"

Network

N/A

Files

memory/2328-2-0x0000000000400000-0x000000000041E000-memory.dmp

memory/2328-4-0x0000000000400000-0x000000000041E000-memory.dmp

memory/2328-6-0x0000000000400000-0x000000000041E000-memory.dmp

memory/2328-10-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

memory/2328-12-0x0000000000400000-0x000000000041E000-memory.dmp

memory/2328-14-0x0000000000400000-0x000000000041E000-memory.dmp

memory/2552-17-0x0000000000400000-0x0000000000414000-memory.dmp

memory/2552-19-0x0000000000400000-0x0000000000414000-memory.dmp

memory/2552-21-0x0000000000400000-0x0000000000414000-memory.dmp

memory/2552-25-0x0000000000400000-0x0000000000414000-memory.dmp

memory/2328-26-0x0000000000400000-0x000000000041E000-memory.dmp

memory/2552-32-0x0000000000400000-0x0000000000414000-memory.dmp

memory/2552-33-0x0000000000400000-0x0000000000414000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-03-27 04:03

Reported

2024-03-27 04:06

Platform

win10v2004-20240226-en

Max time kernel

147s

Max time network

155s

Command Line

"C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.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

Reads data files stored by FTP clients

spyware stealer

Reads user/profile data of web browsers

spyware stealer

Writes to the Master Boot Record (MBR)

bootkit persistence
Description Indicator Process Target
File opened for modification \??\PhysicalDrive0 C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe N/A

Enumerates physical storage devices

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 4436 wrote to memory of 1420 N/A C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe
PID 4436 wrote to memory of 1420 N/A C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe
PID 4436 wrote to memory of 1420 N/A C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe
PID 4436 wrote to memory of 1420 N/A C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe
PID 4436 wrote to memory of 1420 N/A C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe
PID 4436 wrote to memory of 1420 N/A C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe
PID 4436 wrote to memory of 1420 N/A C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe
PID 4436 wrote to memory of 1420 N/A C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe
PID 1420 wrote to memory of 1696 N/A C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe
PID 1420 wrote to memory of 1696 N/A C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe
PID 1420 wrote to memory of 1696 N/A C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe
PID 1420 wrote to memory of 1696 N/A C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe
PID 1420 wrote to memory of 1696 N/A C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe
PID 1420 wrote to memory of 1696 N/A C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe
PID 1420 wrote to memory of 1696 N/A C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe
PID 1420 wrote to memory of 1696 N/A C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe

Processes

C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe

"C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe"

C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe

"C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe"

C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe

"C:\Users\Admin\AppData\Local\Temp\e0b8ddf70d7ab115a8bfa5b49f285a5d.exe"

Network

Country Destination Domain Proto
US 8.8.8.8:53 67.31.126.40.in-addr.arpa udp
US 8.8.8.8:53 13.86.106.20.in-addr.arpa udp
US 8.8.8.8:53 173.178.17.96.in-addr.arpa udp
US 8.8.8.8:53 57.169.31.20.in-addr.arpa udp
US 8.8.8.8:53 9.228.82.20.in-addr.arpa udp
N/A 224.0.0.251:5353 udp
US 8.8.8.8:53 103.169.127.40.in-addr.arpa udp
US 8.8.8.8:53 41.110.16.96.in-addr.arpa udp
US 8.8.8.8:53 241.154.82.20.in-addr.arpa udp
US 8.8.8.8:53 56.126.166.20.in-addr.arpa udp
US 8.8.8.8:53 2.136.104.51.in-addr.arpa udp
US 8.8.8.8:53 104.241.123.92.in-addr.arpa udp
US 8.8.8.8:53 119.110.54.20.in-addr.arpa udp
US 8.8.8.8:53 146.78.124.51.in-addr.arpa udp
US 8.8.8.8:53 217.135.221.88.in-addr.arpa udp
US 8.8.8.8:53 176.178.17.96.in-addr.arpa udp
US 8.8.8.8:53 11.134.221.88.in-addr.arpa udp
US 8.8.8.8:53 43.58.199.20.in-addr.arpa udp
US 8.8.8.8:53 tse1.mm.bing.net udp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 8.8.8.8:53 18.134.221.88.in-addr.arpa udp
US 8.8.8.8:53 174.178.17.96.in-addr.arpa udp
US 8.8.8.8:53 180.178.17.96.in-addr.arpa udp
US 8.8.8.8:53 0.204.248.87.in-addr.arpa udp
US 8.8.8.8:53 31.243.111.52.in-addr.arpa udp
US 8.8.8.8:53 224.162.46.104.in-addr.arpa udp

Files

memory/1420-2-0x0000000000400000-0x000000000041E000-memory.dmp

memory/1420-4-0x0000000000400000-0x000000000041E000-memory.dmp

memory/1696-7-0x0000000000400000-0x0000000000414000-memory.dmp

memory/1696-9-0x0000000000400000-0x0000000000414000-memory.dmp

memory/1420-11-0x0000000000400000-0x000000000041E000-memory.dmp

memory/1696-14-0x0000000000400000-0x0000000000414000-memory.dmp