Malware Analysis Report

2025-01-22 19:30

Sample ID 240807-cqg16sybjr
Target cef901fb3035aaf084f8b42bf72d00f99886e3b08a716760d6a90d1851b37441.zip
SHA256 fcf3b615f3fb2230959cdf0d8c0b8ff4da31df6fae792cb4a7e80d7cba543439
Tags
discovery 0 cobaltstrike
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V15

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

fcf3b615f3fb2230959cdf0d8c0b8ff4da31df6fae792cb4a7e80d7cba543439

Threat Level: Known bad

The file cef901fb3035aaf084f8b42bf72d00f99886e3b08a716760d6a90d1851b37441.zip was found to be: Known bad.

Malicious Activity Summary

discovery 0 cobaltstrike

Cobalt Strike reflective loader

Cobaltstrike family

Program crash

System Location Discovery: System Language Discovery

Unsigned PE

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-08-07 02:16

Signatures

Cobalt Strike reflective loader

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

Cobaltstrike family

cobaltstrike

Unsigned PE

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

Analysis: behavioral2

Detonation Overview

Submitted

2024-08-07 02:16

Reported

2024-08-07 02:19

Platform

win10v2004-20240802-en

Max time kernel

90s

Max time network

139s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\cef901fb3035aaf084f8b42bf72d00f99886e3b08a716760d6a90d1851b37441.dll,#1

Signatures

Program crash

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\WerFault.exe C:\Windows\SysWOW64\rundll32.exe

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\SysWOW64\rundll32.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 380 wrote to memory of 4008 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 380 wrote to memory of 4008 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 380 wrote to memory of 4008 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe

Processes

C:\Windows\system32\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\cef901fb3035aaf084f8b42bf72d00f99886e3b08a716760d6a90d1851b37441.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\cef901fb3035aaf084f8b42bf72d00f99886e3b08a716760d6a90d1851b37441.dll,#1

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 4008 -ip 4008

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 4008 -s 556

Network

Country Destination Domain Proto
US 8.8.8.8:53 g.bing.com udp
US 204.79.197.237:443 g.bing.com tcp
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 76.32.126.40.in-addr.arpa udp
US 8.8.8.8:53 237.197.79.204.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 26.35.223.20.in-addr.arpa udp
US 8.8.8.8:53 15.164.165.52.in-addr.arpa udp
US 8.8.8.8:53 103.169.127.40.in-addr.arpa udp
US 8.8.8.8:53 172.214.232.199.in-addr.arpa udp
US 8.8.8.8:53 31.243.111.52.in-addr.arpa udp

Files

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-08-07 02:16

Reported

2024-08-07 02:19

Platform

win7-20240708-en

Max time kernel

117s

Max time network

118s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\cef901fb3035aaf084f8b42bf72d00f99886e3b08a716760d6a90d1851b37441.dll,#1

Signatures

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\SysWOW64\rundll32.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 1716 wrote to memory of 1540 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 1716 wrote to memory of 1540 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 1716 wrote to memory of 1540 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 1716 wrote to memory of 1540 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 1716 wrote to memory of 1540 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 1716 wrote to memory of 1540 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 1716 wrote to memory of 1540 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe

Processes

C:\Windows\system32\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\cef901fb3035aaf084f8b42bf72d00f99886e3b08a716760d6a90d1851b37441.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\cef901fb3035aaf084f8b42bf72d00f99886e3b08a716760d6a90d1851b37441.dll,#1

Network

N/A

Files

N/A