Malware Analysis Report

2024-10-16 03:26

Sample ID 210726-felcjwc41e
Target b9b71eb04d255b21e3272eef5f4c15d1c208183748dfad3569efd455d87879c6.sample
SHA256 b9b71eb04d255b21e3272eef5f4c15d1c208183748dfad3569efd455d87879c6
Tags
egregor ransomware
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

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

b9b71eb04d255b21e3272eef5f4c15d1c208183748dfad3569efd455d87879c6

Threat Level: Known bad

The file b9b71eb04d255b21e3272eef5f4c15d1c208183748dfad3569efd455d87879c6.sample was found to be: Known bad.

Malicious Activity Summary

egregor ransomware

Egregor Ransomware

Suspicious use of WriteProcessMemory

MITRE ATT&CK

N/A

Analysis: static1

Detonation Overview

Reported

2021-07-26 12:40

Signatures

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2021-07-26 12:40

Reported

2021-07-26 12:49

Platform

win7v20210408

Max time kernel

4s

Max time network

36s

Command Line

regsvr32 /s C:\Users\Admin\AppData\Local\Temp\b9b71eb04d255b21e3272eef5f4c15d1c208183748dfad3569efd455d87879c6.sample.dll

Signatures

Egregor Ransomware

ransomware egregor

Processes

C:\Windows\system32\regsvr32.exe

regsvr32 /s C:\Users\Admin\AppData\Local\Temp\b9b71eb04d255b21e3272eef5f4c15d1c208183748dfad3569efd455d87879c6.sample.dll

C:\Windows\SysWOW64\regsvr32.exe

/s C:\Users\Admin\AppData\Local\Temp\b9b71eb04d255b21e3272eef5f4c15d1c208183748dfad3569efd455d87879c6.sample.dll

Network

N/A

Files

memory/752-59-0x000007FEFB7B1000-0x000007FEFB7B3000-memory.dmp

memory/1572-60-0x0000000000000000-mapping.dmp

memory/1572-61-0x0000000075451000-0x0000000075453000-memory.dmp

memory/1572-62-0x00000000001D0000-0x000000000020F000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2021-07-26 12:40

Reported

2021-07-26 12:48

Platform

win10v20210410

Max time kernel

14s

Max time network

116s

Command Line

regsvr32 /s C:\Users\Admin\AppData\Local\Temp\b9b71eb04d255b21e3272eef5f4c15d1c208183748dfad3569efd455d87879c6.sample.dll

Signatures

Egregor Ransomware

ransomware egregor

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 3624 wrote to memory of 1012 N/A C:\Windows\system32\regsvr32.exe C:\Windows\SysWOW64\regsvr32.exe
PID 3624 wrote to memory of 1012 N/A C:\Windows\system32\regsvr32.exe C:\Windows\SysWOW64\regsvr32.exe
PID 3624 wrote to memory of 1012 N/A C:\Windows\system32\regsvr32.exe C:\Windows\SysWOW64\regsvr32.exe

Processes

C:\Windows\system32\regsvr32.exe

regsvr32 /s C:\Users\Admin\AppData\Local\Temp\b9b71eb04d255b21e3272eef5f4c15d1c208183748dfad3569efd455d87879c6.sample.dll

C:\Windows\SysWOW64\regsvr32.exe

/s C:\Users\Admin\AppData\Local\Temp\b9b71eb04d255b21e3272eef5f4c15d1c208183748dfad3569efd455d87879c6.sample.dll

Network

N/A

Files

memory/1012-114-0x0000000000000000-mapping.dmp

memory/1012-115-0x0000000004810000-0x000000000484F000-memory.dmp