Malware Analysis Report

2025-06-16 06:57

Sample ID 241104-eb1k3stckn
Target ef53e8071a456732eb373d3e1e6d599008681bde0a3cb05fdf862c589a2723de
SHA256 ef53e8071a456732eb373d3e1e6d599008681bde0a3cb05fdf862c589a2723de
Tags
discovery evasion trojan
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

ef53e8071a456732eb373d3e1e6d599008681bde0a3cb05fdf862c589a2723de

Threat Level: Known bad

The file ef53e8071a456732eb373d3e1e6d599008681bde0a3cb05fdf862c589a2723de was found to be: Known bad.

Malicious Activity Summary

discovery evasion trojan

UAC bypass

Blocklisted process makes network request

Checks installed software on the system

Enumerates connected drives

Unsigned PE

System Location Discovery: System Language Discovery

System policy modification

Checks processor information in registry

Suspicious use of WriteProcessMemory

Suspicious behavior: EnumeratesProcesses

Suspicious use of SetWindowsHookEx

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-11-04 03:46

Signatures

Unsigned PE

Description Indicator Process Target
N/A N/A N/A N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-11-04 03:46

Reported

2024-11-04 03:49

Platform

win7-20240903-en

Max time kernel

150s

Max time network

148s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\ef53e8071a456732eb373d3e1e6d599008681bde0a3cb05fdf862c589a2723de.dll,#1

Signatures

UAC bypass

evasion trojan
Description Indicator Process Target
Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0" C:\Windows\SysWOW64\rundll32.exe N/A
Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0" C:\Windows\SysWOW64\rundll32.exe N/A

Blocklisted process makes network request

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

Checks installed software on the system

discovery

Enumerates connected drives

Description Indicator Process Target
File opened (read-only) \??\H: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\X: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\O: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\Q: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\R: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\E: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\G: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\J: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\K: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\L: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\S: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\V: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\N: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\U: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\W: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\Z: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\Y: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\B: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\I: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\M: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\P: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\T: C:\Windows\SysWOW64\rundll32.exe N/A

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

Checks processor information in registry

Description Indicator Process Target
Key opened \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ C:\Windows\SysWOW64\rundll32.exe N/A
Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString C:\Windows\SysWOW64\rundll32.exe N/A

Suspicious behavior: EnumeratesProcesses

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

Suspicious use of SetWindowsHookEx

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

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2672 wrote to memory of 3064 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2672 wrote to memory of 3064 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2672 wrote to memory of 3064 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2672 wrote to memory of 3064 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2672 wrote to memory of 3064 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2672 wrote to memory of 3064 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2672 wrote to memory of 3064 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe

System policy modification

evasion
Description Indicator Process Target
Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0" C:\Windows\SysWOW64\rundll32.exe N/A
Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0" C:\Windows\SysWOW64\rundll32.exe N/A

Processes

C:\Windows\system32\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\ef53e8071a456732eb373d3e1e6d599008681bde0a3cb05fdf862c589a2723de.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\ef53e8071a456732eb373d3e1e6d599008681bde0a3cb05fdf862c589a2723de.dll,#1

Network

Country Destination Domain Proto
KR 91.204.224.157:6666 tcp
KR 91.204.224.157:6666 tcp

Files

memory/3064-0-0x0000000000180000-0x0000000000182000-memory.dmp

memory/3064-1-0x0000000002310000-0x000000000238E000-memory.dmp

memory/3064-3-0x0000000000B90000-0x0000000000BE5000-memory.dmp

memory/3064-6-0x0000000000B90000-0x0000000000BE5000-memory.dmp

memory/3064-8-0x0000000000B90000-0x0000000000BE5000-memory.dmp

memory/3064-7-0x0000000000B90000-0x0000000000BE5000-memory.dmp

memory/3064-5-0x0000000000B90000-0x0000000000BE5000-memory.dmp

memory/3064-9-0x0000000000B90000-0x0000000000BE5000-memory.dmp

memory/3064-10-0x0000000000B90000-0x0000000000BE5000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-11-04 03:46

Reported

2024-11-04 03:49

Platform

win10v2004-20241007-en

Max time kernel

149s

Max time network

151s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\ef53e8071a456732eb373d3e1e6d599008681bde0a3cb05fdf862c589a2723de.dll,#1

Signatures

UAC bypass

evasion trojan
Description Indicator Process Target
Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0" C:\Windows\SysWOW64\rundll32.exe N/A
Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0" C:\Windows\SysWOW64\rundll32.exe N/A

Blocklisted process makes network request

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

Checks installed software on the system

discovery

Enumerates connected drives

Description Indicator Process Target
File opened (read-only) \??\B: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\J: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\K: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\N: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\S: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\M: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\R: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\V: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\W: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\X: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\E: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\H: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\O: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\P: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\Q: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\U: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\G: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\I: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\L: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\T: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\Y: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\Z: C:\Windows\SysWOW64\rundll32.exe N/A

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

Checks processor information in registry

Description Indicator Process Target
Key opened \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ C:\Windows\SysWOW64\rundll32.exe N/A
Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString C:\Windows\SysWOW64\rundll32.exe N/A

Suspicious behavior: EnumeratesProcesses

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

Suspicious use of SetWindowsHookEx

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

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 3552 wrote to memory of 2040 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 3552 wrote to memory of 2040 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 3552 wrote to memory of 2040 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe

System policy modification

evasion
Description Indicator Process Target
Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0" C:\Windows\SysWOW64\rundll32.exe N/A
Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0" C:\Windows\SysWOW64\rundll32.exe N/A

Processes

C:\Windows\system32\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\ef53e8071a456732eb373d3e1e6d599008681bde0a3cb05fdf862c589a2723de.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\ef53e8071a456732eb373d3e1e6d599008681bde0a3cb05fdf862c589a2723de.dll,#1

Network

Country Destination Domain Proto
KR 91.204.224.157:6666 tcp
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 228.249.119.40.in-addr.arpa udp
US 8.8.8.8:53 157.224.204.91.in-addr.arpa udp
US 8.8.8.8:53 172.214.232.199.in-addr.arpa udp
KR 91.204.224.157:6666 tcp
US 8.8.8.8:53 g.bing.com udp
US 150.171.27.10:443 g.bing.com tcp
US 8.8.8.8:53 133.32.126.40.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 10.27.171.150.in-addr.arpa udp
US 8.8.8.8:53 97.17.167.52.in-addr.arpa udp
US 8.8.8.8:53 200.163.202.172.in-addr.arpa udp
US 8.8.8.8:53 15.164.165.52.in-addr.arpa udp
US 8.8.8.8:53 107.12.20.2.in-addr.arpa udp
US 8.8.8.8:53 69.209.201.84.in-addr.arpa udp
US 8.8.8.8:53 240.221.184.93.in-addr.arpa udp
US 8.8.8.8:53 11.227.111.52.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 55.36.223.20.in-addr.arpa udp

Files

memory/2040-0-0x0000000002E90000-0x0000000002E92000-memory.dmp

memory/2040-1-0x0000000003410000-0x000000000348E000-memory.dmp

memory/2040-2-0x0000000002FA0000-0x0000000002FF5000-memory.dmp

memory/2040-6-0x0000000002FA0000-0x0000000002FF5000-memory.dmp

memory/2040-5-0x0000000002FA0000-0x0000000002FF5000-memory.dmp

memory/2040-4-0x0000000002FA0000-0x0000000002FF5000-memory.dmp

memory/2040-7-0x0000000002FA0000-0x0000000002FF5000-memory.dmp

memory/2040-8-0x0000000002FA0000-0x0000000002FF5000-memory.dmp

memory/2040-9-0x0000000002FA0000-0x0000000002FF5000-memory.dmp