Malware Analysis Report

2025-03-15 08:00

Sample ID 240812-htyqzsvbmf
Target b2170857d00662b2c1bda2649b05767bc5f141e3ca4914846c2de3292f24715d.zip
SHA256 3f24eaca4de5182f8506dca795c86f7bd17c56b9233019ff0640f2a55df9089f
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

3f24eaca4de5182f8506dca795c86f7bd17c56b9233019ff0640f2a55df9089f

Threat Level: Known bad

The file b2170857d00662b2c1bda2649b05767bc5f141e3ca4914846c2de3292f24715d.zip was found to be: Known bad.

Malicious Activity Summary

0 cobaltstrike discovery

Cobalt Strike reflective loader

Cobaltstrike family

Program crash

Unsigned PE

System Location Discovery: System Language Discovery

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-08-12 07:02

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

2024-08-12 07:02

Reported

2024-08-12 07:04

Platform

win7-20240708-en

Max time kernel

119s

Max time network

120s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\b2170857d00662b2c1bda2649b05767bc5f141e3ca4914846c2de3292f24715d.dll,#1

Signatures

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 2204 wrote to memory of 1708 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2204 wrote to memory of 1708 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2204 wrote to memory of 1708 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2204 wrote to memory of 1708 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2204 wrote to memory of 1708 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2204 wrote to memory of 1708 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2204 wrote to memory of 1708 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\b2170857d00662b2c1bda2649b05767bc5f141e3ca4914846c2de3292f24715d.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\b2170857d00662b2c1bda2649b05767bc5f141e3ca4914846c2de3292f24715d.dll,#1

Network

N/A

Files

N/A

Analysis: behavioral2

Detonation Overview

Submitted

2024-08-12 07:02

Reported

2024-08-12 07:04

Platform

win10v2004-20240802-en

Max time kernel

148s

Max time network

150s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\b2170857d00662b2c1bda2649b05767bc5f141e3ca4914846c2de3292f24715d.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 3520 wrote to memory of 3976 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 3520 wrote to memory of 3976 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 3520 wrote to memory of 3976 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\b2170857d00662b2c1bda2649b05767bc5f141e3ca4914846c2de3292f24715d.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\b2170857d00662b2c1bda2649b05767bc5f141e3ca4914846c2de3292f24715d.dll,#1

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 468 -p 3976 -ip 3976

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 3976 -s 564

Network

Country Destination Domain Proto
US 8.8.8.8:53 133.211.185.52.in-addr.arpa udp
US 8.8.8.8:53 g.bing.com udp
US 204.79.197.237:443 g.bing.com tcp
US 8.8.8.8:53 240.221.184.93.in-addr.arpa udp
US 8.8.8.8:53 237.197.79.204.in-addr.arpa udp
US 8.8.8.8:53 138.32.126.40.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 205.47.74.20.in-addr.arpa udp
US 8.8.8.8:53 13.86.106.20.in-addr.arpa udp
US 8.8.8.8:53 104.219.191.52.in-addr.arpa udp
US 8.8.8.8:53 157.123.68.40.in-addr.arpa udp
US 8.8.8.8:53 206.23.85.13.in-addr.arpa udp
US 8.8.8.8:53 172.214.232.199.in-addr.arpa udp
IE 52.111.236.23:443 tcp
US 8.8.8.8:53 43.229.111.52.in-addr.arpa udp
US 8.8.8.8:53 tse1.mm.bing.net udp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 8.8.8.8:53 57.169.31.20.in-addr.arpa udp
US 8.8.8.8:53 10.28.171.150.in-addr.arpa udp

Files

N/A