Malware Analysis Report

2024-08-06 07:57

Sample ID 230907-yg7q5adg29
Target 2023-08-23_bc79d08dd924f6385a7d0f5fe2143a84_cobalt-strike_cobaltstrike_meterpreter_JC.exe
SHA256 8a91a5d6b395eb58411fc11ef64d73721f51bd80d8da193910a690f3e791a16b
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

8a91a5d6b395eb58411fc11ef64d73721f51bd80d8da193910a690f3e791a16b

Threat Level: Known bad

The file 2023-08-23_bc79d08dd924f6385a7d0f5fe2143a84_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

2023-09-07 19:46

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

2023-09-07 19:46

Reported

2023-09-07 19:49

Platform

win7-20230831-en

Max time kernel

122s

Max time network

132s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\2023-08-23_bc79d08dd924f6385a7d0f5fe2143a84_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 532 wrote to memory of 2160 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 532 wrote to memory of 2160 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 532 wrote to memory of 2160 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 532 wrote to memory of 2160 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 532 wrote to memory of 2160 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 532 wrote to memory of 2160 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 532 wrote to memory of 2160 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2160 wrote to memory of 2192 N/A C:\Windows\SysWOW64\rundll32.exe C:\Windows\SysWOW64\WerFault.exe
PID 2160 wrote to memory of 2192 N/A C:\Windows\SysWOW64\rundll32.exe C:\Windows\SysWOW64\WerFault.exe
PID 2160 wrote to memory of 2192 N/A C:\Windows\SysWOW64\rundll32.exe C:\Windows\SysWOW64\WerFault.exe
PID 2160 wrote to memory of 2192 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_bc79d08dd924f6385a7d0f5fe2143a84_cobalt-strike_cobaltstrike_meterpreter_JC.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\2023-08-23_bc79d08dd924f6385a7d0f5fe2143a84_cobalt-strike_cobaltstrike_meterpreter_JC.dll,#1

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 2160 -s 232

Network

N/A

Files

N/A

Analysis: behavioral2

Detonation Overview

Submitted

2023-09-07 19:46

Reported

2023-09-07 19:49

Platform

win10v2004-20230831-en

Max time kernel

142s

Max time network

163s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\2023-08-23_bc79d08dd924f6385a7d0f5fe2143a84_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 1856 wrote to memory of 2780 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 1856 wrote to memory of 2780 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 1856 wrote to memory of 2780 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_bc79d08dd924f6385a7d0f5fe2143a84_cobalt-strike_cobaltstrike_meterpreter_JC.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\2023-08-23_bc79d08dd924f6385a7d0f5fe2143a84_cobalt-strike_cobaltstrike_meterpreter_JC.dll,#1

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 2780 -ip 2780

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 2780 -s 632

Network

Country Destination Domain Proto
US 8.8.8.8:53 0.159.190.20.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 8.3.197.209.in-addr.arpa udp
US 8.8.8.8:53 241.154.82.20.in-addr.arpa udp
US 8.8.8.8:53 43.58.199.20.in-addr.arpa udp
US 8.8.8.8:53 41.110.16.96.in-addr.arpa udp
US 8.8.8.8:53 157.123.68.40.in-addr.arpa udp
US 8.8.8.8:53 15.164.165.52.in-addr.arpa udp
US 8.8.8.8:53 1.202.248.87.in-addr.arpa udp
US 8.8.8.8:53 126.38.238.8.in-addr.arpa udp
US 8.8.8.8:53 11.227.111.52.in-addr.arpa udp
US 8.8.8.8:53 85.65.42.20.in-addr.arpa udp

Files

N/A