Malware Analysis Report

2024-08-06 07:57

Sample ID 230904-te77naha6z
Target 2023-08-23_535ca62f8774e763efd9168a3877b3cc_cobalt-strike_cobaltstrike_meterpreter_JC.exe
SHA256 61c1d9c410d3128276e10ffed5caf9c53c62fc91b2d4cb175a9af41c907f0764
Tags
1359593325 cobaltstrike
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK Matrix

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

61c1d9c410d3128276e10ffed5caf9c53c62fc91b2d4cb175a9af41c907f0764

Threat Level: Known bad

The file 2023-08-23_535ca62f8774e763efd9168a3877b3cc_cobalt-strike_cobaltstrike_meterpreter_JC.exe was found to be: Known bad.

Malicious Activity Summary

1359593325 cobaltstrike

Cobalt Strike reflective loader

Cobaltstrike family

Unsigned PE

Program crash

Suspicious use of WriteProcessMemory

MITRE ATT&CK Matrix

N/A

Analysis: static1

Detonation Overview

Reported

2023-09-04 15:59

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: behavioral1

Detonation Overview

Submitted

2023-09-04 15:59

Reported

2023-09-04 16:01

Platform

win7-20230831-en

Max time kernel

117s

Max time network

121s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\2023-08-23_535ca62f8774e763efd9168a3877b3cc_cobalt-strike_cobaltstrike_meterpreter_JC.dll,#1

Signatures

Program crash

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

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2076 wrote to memory of 2880 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2076 wrote to memory of 2880 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2076 wrote to memory of 2880 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2076 wrote to memory of 2880 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2076 wrote to memory of 2880 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2076 wrote to memory of 2880 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2076 wrote to memory of 2880 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2880 wrote to memory of 3000 N/A C:\Windows\SysWOW64\rundll32.exe C:\Windows\SysWOW64\WerFault.exe
PID 2880 wrote to memory of 3000 N/A C:\Windows\SysWOW64\rundll32.exe C:\Windows\SysWOW64\WerFault.exe
PID 2880 wrote to memory of 3000 N/A C:\Windows\SysWOW64\rundll32.exe C:\Windows\SysWOW64\WerFault.exe
PID 2880 wrote to memory of 3000 N/A C:\Windows\SysWOW64\rundll32.exe C:\Windows\SysWOW64\WerFault.exe

Processes

C:\Windows\system32\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\2023-08-23_535ca62f8774e763efd9168a3877b3cc_cobalt-strike_cobaltstrike_meterpreter_JC.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\2023-08-23_535ca62f8774e763efd9168a3877b3cc_cobalt-strike_cobaltstrike_meterpreter_JC.dll,#1

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 2880 -s 232

Network

N/A

Files

N/A

Analysis: behavioral2

Detonation Overview

Submitted

2023-09-04 15:59

Reported

2023-09-04 16:01

Platform

win10v2004-20230831-en

Max time kernel

142s

Max time network

147s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\2023-08-23_535ca62f8774e763efd9168a3877b3cc_cobalt-strike_cobaltstrike_meterpreter_JC.dll,#1

Signatures

Program crash

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

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2408 wrote to memory of 2696 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2408 wrote to memory of 2696 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2408 wrote to memory of 2696 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\2023-08-23_535ca62f8774e763efd9168a3877b3cc_cobalt-strike_cobaltstrike_meterpreter_JC.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\2023-08-23_535ca62f8774e763efd9168a3877b3cc_cobalt-strike_cobaltstrike_meterpreter_JC.dll,#1

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 2696 -ip 2696

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 2696 -s 632

Network

Country Destination Domain Proto
US 8.8.8.8:53 9.228.82.20.in-addr.arpa udp
US 8.8.8.8:53 26.35.223.20.in-addr.arpa udp
US 8.8.8.8:53 134.32.126.40.in-addr.arpa udp
US 8.8.8.8:53 195.233.44.23.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 183.59.114.20.in-addr.arpa udp
US 8.8.8.8:53 171.39.242.20.in-addr.arpa udp
US 8.8.8.8:53 1.202.248.87.in-addr.arpa udp
US 8.8.8.8:53 120.207.253.8.in-addr.arpa udp
US 8.8.8.8:53 21.236.111.52.in-addr.arpa udp
US 8.8.8.8:53 169.117.168.52.in-addr.arpa udp

Files

N/A