Malware Analysis Report

2024-12-06 03:19

Sample ID 241024-czz84ssgkq
Target fbd25c9c4f573ef15a3af94053a7bcfcb7a8a491f1b0af10c14c3c8a39bec559.arj
SHA256 fbd25c9c4f573ef15a3af94053a7bcfcb7a8a491f1b0af10c14c3c8a39bec559
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

fbd25c9c4f573ef15a3af94053a7bcfcb7a8a491f1b0af10c14c3c8a39bec559

Threat Level: Known bad

The file fbd25c9c4f573ef15a3af94053a7bcfcb7a8a491f1b0af10c14c3c8a39bec559.arj was found to be: Known bad.

Malicious Activity Summary

guloader discovery downloader

Guloader,Cloudeye

Loads dropped DLL

System Location Discovery: System Language Discovery

Program crash

Unsigned PE

Enumerates physical storage devices

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-10-24 02:31

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

2024-10-24 02:31

Reported

2024-10-24 09:12

Platform

win7-20240903-en

Max time kernel

119s

Max time network

124s

Command Line

"C:\Users\Admin\AppData\Local\Temp\PAGO_____________________________________________________________________________9300179528.exe"

Signatures

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\PAGO_____________________________________________________________________________9300179528.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\PAGO_____________________________________________________________________________9300179528.exe

"C:\Users\Admin\AppData\Local\Temp\PAGO_____________________________________________________________________________9300179528.exe"

Network

N/A

Files

\Users\Admin\AppData\Local\Temp\nst4A0D.tmp\System.dll

MD5 a4dd044bcd94e9b3370ccf095b31f896
SHA1 17c78201323ab2095bc53184aa8267c9187d5173
SHA256 2e226715419a5882e2e14278940ee8ef0aa648a3ef7af5b3dc252674111962bc
SHA512 87335a43b9ca13e1300c7c23e702e87c669e2bcf4f6065f0c684fc53165e9c1f091cc4d79a3eca3910f0518d3b647120ac0be1a68eaade2e75eaa64adfc92c5a

memory/2756-12-0x0000000004000000-0x0000000006894000-memory.dmp

memory/2756-13-0x0000000004000000-0x0000000006894000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-10-24 02:31

Reported

2024-10-24 09:12

Platform

win10v2004-20241007-en

Max time kernel

143s

Max time network

144s

Command Line

"C:\Users\Admin\AppData\Local\Temp\PAGO_____________________________________________________________________________9300179528.exe"

Signatures

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\PAGO_____________________________________________________________________________9300179528.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\PAGO_____________________________________________________________________________9300179528.exe

"C:\Users\Admin\AppData\Local\Temp\PAGO_____________________________________________________________________________9300179528.exe"

Network

Country Destination Domain Proto
US 8.8.8.8:53 228.249.119.40.in-addr.arpa udp
US 8.8.8.8:53 72.32.126.40.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 209.205.72.20.in-addr.arpa udp
US 8.8.8.8:53 13.86.106.20.in-addr.arpa udp
US 8.8.8.8:53 50.23.12.20.in-addr.arpa udp
US 8.8.8.8:53 171.39.242.20.in-addr.arpa udp
US 8.8.8.8:53 73.190.18.2.in-addr.arpa udp
US 8.8.8.8:53 26.35.223.20.in-addr.arpa udp
US 8.8.8.8:53 88.156.103.20.in-addr.arpa udp
US 8.8.8.8:53 tse1.mm.bing.net udp
US 150.171.27.10:443 tse1.mm.bing.net tcp
US 150.171.27.10:443 tse1.mm.bing.net tcp
US 150.171.27.10:443 tse1.mm.bing.net tcp
US 150.171.27.10:443 tse1.mm.bing.net tcp
US 150.171.27.10:443 tse1.mm.bing.net tcp
US 8.8.8.8:53 10.27.171.150.in-addr.arpa udp

Files

C:\Users\Admin\AppData\Local\Temp\nsiB49C.tmp\System.dll

MD5 a4dd044bcd94e9b3370ccf095b31f896
SHA1 17c78201323ab2095bc53184aa8267c9187d5173
SHA256 2e226715419a5882e2e14278940ee8ef0aa648a3ef7af5b3dc252674111962bc
SHA512 87335a43b9ca13e1300c7c23e702e87c669e2bcf4f6065f0c684fc53165e9c1f091cc4d79a3eca3910f0518d3b647120ac0be1a68eaade2e75eaa64adfc92c5a

memory/1016-11-0x0000000003260000-0x0000000005AF4000-memory.dmp

memory/1016-12-0x0000000003260000-0x0000000005AF4000-memory.dmp

Analysis: behavioral3

Detonation Overview

Submitted

2024-10-24 02:31

Reported

2024-10-24 09:12

Platform

win7-20240903-en

Max time kernel

119s

Max time network

120s

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 2168 -s 224

Network

N/A

Files

N/A

Analysis: behavioral4

Detonation Overview

Submitted

2024-10-24 02:31

Reported

2024-10-24 09:12

Platform

win10v2004-20241007-en

Max time kernel

149s

Max time network

150s

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 3896 wrote to memory of 2872 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 3896 wrote to memory of 2872 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 3896 wrote to memory of 2872 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 408 -p 2872 -ip 2872

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 2872 -s 612

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 g.bing.com udp
US 150.171.30.10:443 g.bing.com tcp
US 8.8.8.8:53 13.86.106.20.in-addr.arpa udp
US 8.8.8.8:53 99.209.201.84.in-addr.arpa udp
US 8.8.8.8:53 10.30.171.150.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 72.32.126.40.in-addr.arpa udp
US 8.8.8.8:53 154.239.44.20.in-addr.arpa udp
US 8.8.8.8:53 50.23.12.20.in-addr.arpa udp
US 8.8.8.8:53 206.23.85.13.in-addr.arpa udp
US 8.8.8.8:53 69.190.18.2.in-addr.arpa udp
US 8.8.8.8:53 100.209.201.84.in-addr.arpa udp
US 8.8.8.8:53 102.209.201.84.in-addr.arpa udp
US 8.8.8.8:53 19.229.111.52.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 10.28.171.150.in-addr.arpa udp
US 8.8.8.8:53 udp

Files

N/A