Malware Analysis Report

2025-01-22 19:29

Sample ID 240807-ewz52svakf
Target 91a7b45deae8c1ad7cb93bb85c43a6966ef8c56d47f76e5f85b564d0a9832d7c.zip
SHA256 de3dea7785ea352f5c01b0a5fb37f610d621362fa5133a1aa428cd84b3840696
Tags
0 cobaltstrike discovery
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V15

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

de3dea7785ea352f5c01b0a5fb37f610d621362fa5133a1aa428cd84b3840696

Threat Level: Known bad

The file 91a7b45deae8c1ad7cb93bb85c43a6966ef8c56d47f76e5f85b564d0a9832d7c.zip was found to be: Known bad.

Malicious Activity Summary

0 cobaltstrike discovery

Cobalt Strike reflective loader

Cobaltstrike family

Unsigned PE

Program crash

System Location Discovery: System Language Discovery

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-08-07 04:18

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

2024-08-07 04:18

Reported

2024-08-07 04:20

Platform

win7-20240704-en

Max time kernel

119s

Max time network

123s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\91a7b45deae8c1ad7cb93bb85c43a6966ef8c56d47f76e5f85b564d0a9832d7c.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

Processes

C:\Windows\system32\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\91a7b45deae8c1ad7cb93bb85c43a6966ef8c56d47f76e5f85b564d0a9832d7c.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\91a7b45deae8c1ad7cb93bb85c43a6966ef8c56d47f76e5f85b564d0a9832d7c.dll,#1

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 1628 -s 244

Network

N/A

Files

N/A

Analysis: behavioral2

Detonation Overview

Submitted

2024-08-07 04:18

Reported

2024-08-07 04:20

Platform

win10v2004-20240802-en

Max time kernel

149s

Max time network

150s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\91a7b45deae8c1ad7cb93bb85c43a6966ef8c56d47f76e5f85b564d0a9832d7c.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 4020 wrote to memory of 4920 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 4020 wrote to memory of 4920 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 4020 wrote to memory of 4920 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\91a7b45deae8c1ad7cb93bb85c43a6966ef8c56d47f76e5f85b564d0a9832d7c.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\91a7b45deae8c1ad7cb93bb85c43a6966ef8c56d47f76e5f85b564d0a9832d7c.dll,#1

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 368 -p 4920 -ip 4920

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 4920 -s 680

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 67.31.126.40.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 8.8.8.8:53 183.59.114.20.in-addr.arpa udp
US 8.8.8.8:53 18.31.95.13.in-addr.arpa udp
US 8.8.8.8:53 240.221.184.93.in-addr.arpa udp
US 8.8.8.8:53 13.227.111.52.in-addr.arpa udp
US 8.8.8.8:53 79.190.18.2.in-addr.arpa udp
US 8.8.8.8:53 udp

Files

N/A