Malware Analysis Report

2025-05-28 18:51

Sample ID 250111-ezk6astlgs
Target 8c4c1550cb63a4c8abebb1ef8a7601953c6c1f0d02f1080f1fb7adc306b99c31.exe
SHA256 8c4c1550cb63a4c8abebb1ef8a7601953c6c1f0d02f1080f1fb7adc306b99c31
Tags
guloader discovery downloader
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: behavioral3

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral4

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

8c4c1550cb63a4c8abebb1ef8a7601953c6c1f0d02f1080f1fb7adc306b99c31

Threat Level: Known bad

The file 8c4c1550cb63a4c8abebb1ef8a7601953c6c1f0d02f1080f1fb7adc306b99c31.exe was found to be: Known bad.

Malicious Activity Summary

guloader discovery downloader

Guloader family

Guloader,Cloudeye

Loads dropped DLL

Program crash

System Location Discovery: System Language Discovery

Unsigned PE

Enumerates physical storage devices

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2025-01-11 04:22

Signatures

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2025-01-11 04:22

Reported

2025-01-11 04:25

Platform

win7-20240903-en

Max time kernel

119s

Max time network

120s

Command Line

"C:\Users\Admin\AppData\Local\Temp\8c4c1550cb63a4c8abebb1ef8a7601953c6c1f0d02f1080f1fb7adc306b99c31.exe"

Signatures

Guloader family

guloader

Guloader,Cloudeye

downloader guloader

Enumerates physical storage devices

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\8c4c1550cb63a4c8abebb1ef8a7601953c6c1f0d02f1080f1fb7adc306b99c31.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\8c4c1550cb63a4c8abebb1ef8a7601953c6c1f0d02f1080f1fb7adc306b99c31.exe

"C:\Users\Admin\AppData\Local\Temp\8c4c1550cb63a4c8abebb1ef8a7601953c6c1f0d02f1080f1fb7adc306b99c31.exe"

Network

N/A

Files

\Users\Admin\AppData\Local\Temp\nsjCD20.tmp\System.dll

MD5 6e55a6e7c3fdbd244042eb15cb1ec739
SHA1 070ea80e2192abc42f358d47b276990b5fa285a9
SHA256 acf90ab6f4edc687e94aaf604d05e16e6cfb5e35873783b50c66f307a35c6506
SHA512 2d504b74da38edc967e3859733a2a9cacd885db82f0ca69bfb66872e882707314c54238344d45945dc98bae85772aceef71a741787922d640627d3c8ae8f1c35

memory/2344-9-0x0000000003A40000-0x000000000511A000-memory.dmp

memory/2344-10-0x0000000003A40000-0x000000000511A000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2025-01-11 04:22

Reported

2025-01-11 04:25

Platform

win10v2004-20241007-en

Max time kernel

149s

Max time network

150s

Command Line

"C:\Users\Admin\AppData\Local\Temp\8c4c1550cb63a4c8abebb1ef8a7601953c6c1f0d02f1080f1fb7adc306b99c31.exe"

Signatures

Guloader family

guloader

Guloader,Cloudeye

downloader guloader

Enumerates physical storage devices

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\8c4c1550cb63a4c8abebb1ef8a7601953c6c1f0d02f1080f1fb7adc306b99c31.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\8c4c1550cb63a4c8abebb1ef8a7601953c6c1f0d02f1080f1fb7adc306b99c31.exe

"C:\Users\Admin\AppData\Local\Temp\8c4c1550cb63a4c8abebb1ef8a7601953c6c1f0d02f1080f1fb7adc306b99c31.exe"

Network

Country Destination Domain Proto
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 133.211.185.52.in-addr.arpa udp
US 8.8.8.8:53 60.153.16.2.in-addr.arpa udp
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 28.118.140.52.in-addr.arpa udp
US 8.8.8.8:53 209.205.72.20.in-addr.arpa udp
US 8.8.8.8:53 56.163.245.4.in-addr.arpa udp
US 8.8.8.8:53 171.39.242.20.in-addr.arpa udp
US 8.8.8.8:53 112.27.33.23.in-addr.arpa udp
US 8.8.8.8:53 172.214.232.199.in-addr.arpa udp
US 8.8.8.8:53 48.229.111.52.in-addr.arpa udp
US 8.8.8.8:53 94.65.42.20.in-addr.arpa udp

Files

C:\Users\Admin\AppData\Local\Temp\nsa9F8D.tmp\System.dll

MD5 6e55a6e7c3fdbd244042eb15cb1ec739
SHA1 070ea80e2192abc42f358d47b276990b5fa285a9
SHA256 acf90ab6f4edc687e94aaf604d05e16e6cfb5e35873783b50c66f307a35c6506
SHA512 2d504b74da38edc967e3859733a2a9cacd885db82f0ca69bfb66872e882707314c54238344d45945dc98bae85772aceef71a741787922d640627d3c8ae8f1c35

memory/4380-8-0x0000000004560000-0x0000000005C3A000-memory.dmp

memory/4380-9-0x0000000004560000-0x0000000005C3A000-memory.dmp

Analysis: behavioral3

Detonation Overview

Submitted

2025-01-11 04:22

Reported

2025-01-11 04:25

Platform

win7-20240903-en

Max time kernel

120s

Max time network

122s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\$PLUGINSDIR\System.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\$PLUGINSDIR\System.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\$PLUGINSDIR\System.dll,#1

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 1980 -s 220

Network

N/A

Files

N/A

Analysis: behavioral4

Detonation Overview

Submitted

2025-01-11 04:22

Reported

2025-01-11 04:25

Platform

win10v2004-20241007-en

Max time kernel

93s

Max time network

95s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\$PLUGINSDIR\System.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 1932 wrote to memory of 3976 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 1932 wrote to memory of 3976 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 1932 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\$PLUGINSDIR\System.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\$PLUGINSDIR\System.dll,#1

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 404 -p 3976 -ip 3976

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 3976 -s 612

Network

Country Destination Domain Proto
US 8.8.8.8:53 68.32.126.40.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 58.55.71.13.in-addr.arpa udp
US 8.8.8.8:53 28.118.140.52.in-addr.arpa udp
US 8.8.8.8:53 56.163.245.4.in-addr.arpa udp
US 8.8.8.8:53 171.39.242.20.in-addr.arpa udp
US 8.8.8.8:53 19.229.111.52.in-addr.arpa udp

Files

N/A