Malware Analysis Report

2024-08-06 07:58

Sample ID 230908-nn1laaba9w
Target 2023-08-23_d12d9bcdb6f25681c8b84907e440f5ab_cobalt-strike_cobaltstrike_meterpreter_JC.exe
SHA256 4a8862d41d74bb81df8aaad2664922e2afc22b0cbfe682894441f7ddbf07f30a
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

4a8862d41d74bb81df8aaad2664922e2afc22b0cbfe682894441f7ddbf07f30a

Threat Level: Known bad

The file 2023-08-23_d12d9bcdb6f25681c8b84907e440f5ab_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

2023-09-08 11:33

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

2023-09-08 11:33

Reported

2023-09-08 11:35

Platform

win7-20230831-en

Max time kernel

119s

Max time network

123s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\2023-08-23_d12d9bcdb6f25681c8b84907e440f5ab_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 2932 wrote to memory of 1736 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2932 wrote to memory of 1736 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2932 wrote to memory of 1736 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2932 wrote to memory of 1736 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2932 wrote to memory of 1736 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2932 wrote to memory of 1736 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2932 wrote to memory of 1736 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 1736 wrote to memory of 2308 N/A C:\Windows\SysWOW64\rundll32.exe C:\Windows\SysWOW64\WerFault.exe
PID 1736 wrote to memory of 2308 N/A C:\Windows\SysWOW64\rundll32.exe C:\Windows\SysWOW64\WerFault.exe
PID 1736 wrote to memory of 2308 N/A C:\Windows\SysWOW64\rundll32.exe C:\Windows\SysWOW64\WerFault.exe
PID 1736 wrote to memory of 2308 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_d12d9bcdb6f25681c8b84907e440f5ab_cobalt-strike_cobaltstrike_meterpreter_JC.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\2023-08-23_d12d9bcdb6f25681c8b84907e440f5ab_cobalt-strike_cobaltstrike_meterpreter_JC.dll,#1

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 1736 -s 232

Network

N/A

Files

N/A

Analysis: behavioral2

Detonation Overview

Submitted

2023-09-08 11:33

Reported

2023-09-08 11:35

Platform

win10v2004-20230831-en

Max time kernel

140s

Max time network

146s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\2023-08-23_d12d9bcdb6f25681c8b84907e440f5ab_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 3108 wrote to memory of 2156 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 3108 wrote to memory of 2156 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 3108 wrote to memory of 2156 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_d12d9bcdb6f25681c8b84907e440f5ab_cobalt-strike_cobaltstrike_meterpreter_JC.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\2023-08-23_d12d9bcdb6f25681c8b84907e440f5ab_cobalt-strike_cobaltstrike_meterpreter_JC.dll,#1

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 368 -p 2156 -ip 2156

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 2156 -s 640

Network

Country Destination Domain Proto
US 8.8.8.8:53 146.78.124.51.in-addr.arpa udp
US 8.8.8.8:53 240.81.21.72.in-addr.arpa udp
US 8.8.8.8:53 71.159.190.20.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 88.156.103.20.in-addr.arpa udp
US 8.8.8.8:53 158.240.127.40.in-addr.arpa udp
US 8.8.8.8:53 103.169.127.40.in-addr.arpa udp
US 8.8.8.8:53 18.31.95.13.in-addr.arpa udp
US 8.8.8.8:53 15.173.189.20.in-addr.arpa udp

Files

N/A