Malware Analysis Report

2024-08-06 07:57

Sample ID 230907-yf49lsdf85
Target 2023-08-23_b98f1c3ea99ae80025bff40ea3e97998_cobalt-strike_cobaltstrike_meterpreter_JC.exe
SHA256 3bee59e5cd394fb76382fa533f51d77fbaf3e2f93f4581466f682b1c047edf9c
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

3bee59e5cd394fb76382fa533f51d77fbaf3e2f93f4581466f682b1c047edf9c

Threat Level: Known bad

The file 2023-08-23_b98f1c3ea99ae80025bff40ea3e97998_cobalt-strike_cobaltstrike_meterpreter_JC.exe was found to be: Known bad.

Malicious Activity Summary

1359593325 cobaltstrike

Cobaltstrike family

Cobalt Strike reflective loader

Drops file in System32 directory

Program crash

Unsigned PE

Checks processor information in registry

Enumerates system info in registry

Uses Task Scheduler COM API

Suspicious use of WriteProcessMemory

MITRE ATT&CK Matrix V13

Initial Access
TA0001
Execution
TA0002
Persistence
TA0003
Privilege Escalation
TA0004
Defense Evasion
TA0005
Credential Access
TA0006
Discovery
TA0007
Query Registry
T1012
System Information Discovery
T1082
Lateral Movement
TA0008
Collection
TA0009
Exfiltration
TA0010
Command and Control
TA0011
Impact
TA0040
Resource Development
TA0042
Reconnaissance
TA0043

Analysis: static1

Detonation Overview

Reported

2023-09-07 19:44

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 19:44

Reported

2023-09-07 19:47

Platform

win7-20230831-en

Max time kernel

120s

Max time network

124s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\2023-08-23_b98f1c3ea99ae80025bff40ea3e97998_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 2208 wrote to memory of 2008 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2208 wrote to memory of 2008 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2208 wrote to memory of 2008 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2208 wrote to memory of 2008 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2208 wrote to memory of 2008 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2208 wrote to memory of 2008 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2208 wrote to memory of 2008 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2008 wrote to memory of 1968 N/A C:\Windows\SysWOW64\rundll32.exe C:\Windows\SysWOW64\WerFault.exe
PID 2008 wrote to memory of 1968 N/A C:\Windows\SysWOW64\rundll32.exe C:\Windows\SysWOW64\WerFault.exe
PID 2008 wrote to memory of 1968 N/A C:\Windows\SysWOW64\rundll32.exe C:\Windows\SysWOW64\WerFault.exe
PID 2008 wrote to memory of 1968 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_b98f1c3ea99ae80025bff40ea3e97998_cobalt-strike_cobaltstrike_meterpreter_JC.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\2023-08-23_b98f1c3ea99ae80025bff40ea3e97998_cobalt-strike_cobaltstrike_meterpreter_JC.dll,#1

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 2008 -s 232

Network

N/A

Files

N/A

Analysis: behavioral2

Detonation Overview

Submitted

2023-09-07 19:44

Reported

2023-09-07 19:47

Platform

win10v2004-20230831-en

Max time kernel

143s

Max time network

155s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\2023-08-23_b98f1c3ea99ae80025bff40ea3e97998_cobalt-strike_cobaltstrike_meterpreter_JC.dll,#1

Signatures

Drops file in System32 directory

Description Indicator Process Target
File created C:\Windows\system32\config\systemprofile\AppData\Local\Microsoft\InstallService\{92175CE9-04AB-4764-9DB1-CDA4418A792E}.catalogItem C:\Windows\System32\svchost.exe N/A

Program crash

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

Checks processor information in registry

Description Indicator Process Target
Key opened \REGISTRY\MACHINE\Hardware\Description\System\CentralProcessor\0 C:\Windows\System32\svchost.exe N/A
Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz C:\Windows\System32\svchost.exe N/A
Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString C:\Windows\System32\svchost.exe N/A

Enumerates system info in registry

Description Indicator Process Target
Key opened \REGISTRY\MACHINE\Hardware\Description\System\BIOS C:\Windows\System32\svchost.exe N/A
Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemSKU C:\Windows\System32\svchost.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 3908 wrote to memory of 5020 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 3908 wrote to memory of 5020 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 3908 wrote to memory of 5020 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe

Uses Task Scheduler COM API

persistence

Processes

C:\Windows\system32\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\2023-08-23_b98f1c3ea99ae80025bff40ea3e97998_cobalt-strike_cobaltstrike_meterpreter_JC.dll,#1

C:\Windows\System32\svchost.exe

C:\Windows\System32\svchost.exe -k netsvcs -p

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\2023-08-23_b98f1c3ea99ae80025bff40ea3e97998_cobalt-strike_cobaltstrike_meterpreter_JC.dll,#1

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 184 -p 5020 -ip 5020

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 5020 -s 640

Network

Country Destination Domain Proto
US 8.8.8.8:53 4.159.190.20.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 241.154.82.20.in-addr.arpa udp
US 8.8.8.8:53 26.35.223.20.in-addr.arpa udp
US 8.8.8.8:53 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 8.8.8.8:53 126.23.238.8.in-addr.arpa udp
US 8.8.8.8:53 13.227.111.52.in-addr.arpa udp
US 8.8.8.8:53 4.173.189.20.in-addr.arpa udp

Files

N/A