Malware Analysis Report

2025-04-03 14:22

Sample ID 241211-c88a3ssmgy
Target 6f45bd0535f4654ea024f6336cdeecbc44272c903353963a7d7a0f8d8e74a51e.exe
SHA256 6f45bd0535f4654ea024f6336cdeecbc44272c903353963a7d7a0f8d8e74a51e
Tags
discovery guloader downloader
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V15

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral4

Detonation Overview

Command Line

Signatures

Processes

Network

Files

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 Overview

score
10/10

SHA256

6f45bd0535f4654ea024f6336cdeecbc44272c903353963a7d7a0f8d8e74a51e

Threat Level: Known bad

The file 6f45bd0535f4654ea024f6336cdeecbc44272c903353963a7d7a0f8d8e74a51e.exe was found to be: Known bad.

Malicious Activity Summary

discovery guloader downloader

Guloader family

Guloader,Cloudeye

Loads dropped DLL

Legitimate hosting services abused for malware hosting/C2

Suspicious use of NtSetInformationThreadHideFromDebugger

Suspicious use of SetThreadContext

Unsigned PE

Enumerates physical storage devices

Program crash

System Location Discovery: System Language Discovery

Suspicious behavior: MapViewOfSection

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-12-11 02:45

Signatures

Unsigned PE

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

Analysis: behavioral4

Detonation Overview

Submitted

2024-12-11 02:45

Reported

2024-12-11 02:48

Platform

win10v2004-20241007-en

Max time kernel

149s

Max time network

151s

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 3300 wrote to memory of 964 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 3300 wrote to memory of 964 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 3300 wrote to memory of 964 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 444 -p 964 -ip 964

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 964 -s 612

Network

Country Destination Domain Proto
US 8.8.8.8:53 13.86.106.20.in-addr.arpa udp
US 8.8.8.8:53 64.159.190.20.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 212.20.149.52.in-addr.arpa udp
US 8.8.8.8:53 171.39.242.20.in-addr.arpa udp
US 8.8.8.8:53 14.227.111.52.in-addr.arpa udp

Files

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-12-11 02:45

Reported

2024-12-11 02:48

Platform

win7-20241023-en

Max time kernel

5s

Max time network

16s

Command Line

"C:\Users\Admin\AppData\Local\Temp\6f45bd0535f4654ea024f6336cdeecbc44272c903353963a7d7a0f8d8e74a51e.exe"

Signatures

Processes

C:\Users\Admin\AppData\Local\Temp\6f45bd0535f4654ea024f6336cdeecbc44272c903353963a7d7a0f8d8e74a51e.exe

"C:\Users\Admin\AppData\Local\Temp\6f45bd0535f4654ea024f6336cdeecbc44272c903353963a7d7a0f8d8e74a51e.exe"

Network

N/A

Files

\Users\Admin\AppData\Local\Temp\nsyCFA0.tmp\System.dll

MD5 0d7ad4f45dc6f5aa87f606d0331c6901
SHA1 48df0911f0484cbe2a8cdd5362140b63c41ee457
SHA256 3eb38ae99653a7dbc724132ee240f6e5c4af4bfe7c01d31d23faf373f9f2eaca
SHA512 c07de7308cb54205e8bd703001a7fe4fd7796c9ac1b4bb330c77c872bf712b093645f40b80ce7127531fe6746a5b66e18ea073ab6a644934abed9bb64126fea9

memory/1628-15-0x0000000003680000-0x0000000004BEA000-memory.dmp

memory/1628-20-0x0000000003680000-0x0000000004BEA000-memory.dmp

memory/1628-15-0x0000000003680000-0x0000000004BEA000-memory.dmp

memory/1628-20-0x0000000003680000-0x0000000004BEA000-memory.dmp

memory/1628-15-0x0000000003680000-0x0000000004BEA000-memory.dmp

memory/1628-20-0x0000000003680000-0x0000000004BEA000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-12-11 02:45

Reported

2024-12-11 02:48

Platform

win10v2004-20241007-en

Max time kernel

148s

Max time network

151s

Command Line

"C:\Users\Admin\AppData\Local\Temp\6f45bd0535f4654ea024f6336cdeecbc44272c903353963a7d7a0f8d8e74a51e.exe"

Signatures

Guloader family

guloader

Guloader,Cloudeye

downloader guloader

Legitimate hosting services abused for malware hosting/C2

Description Indicator Process Target
N/A drive.google.com N/A N/A
N/A drive.google.com N/A N/A
N/A drive.google.com N/A N/A
N/A drive.google.com N/A N/A

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\6f45bd0535f4654ea024f6336cdeecbc44272c903353963a7d7a0f8d8e74a51e.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\6f45bd0535f4654ea024f6336cdeecbc44272c903353963a7d7a0f8d8e74a51e.exe N/A

Suspicious behavior: MapViewOfSection

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\6f45bd0535f4654ea024f6336cdeecbc44272c903353963a7d7a0f8d8e74a51e.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\6f45bd0535f4654ea024f6336cdeecbc44272c903353963a7d7a0f8d8e74a51e.exe

"C:\Users\Admin\AppData\Local\Temp\6f45bd0535f4654ea024f6336cdeecbc44272c903353963a7d7a0f8d8e74a51e.exe"

C:\Users\Admin\AppData\Local\Temp\6f45bd0535f4654ea024f6336cdeecbc44272c903353963a7d7a0f8d8e74a51e.exe

"C:\Users\Admin\AppData\Local\Temp\6f45bd0535f4654ea024f6336cdeecbc44272c903353963a7d7a0f8d8e74a51e.exe"

Network

Country Destination Domain Proto
US 8.8.8.8:53 232.168.11.51.in-addr.arpa udp
US 8.8.8.8:53 drive.google.com udp
GB 142.250.179.238:443 drive.google.com tcp
US 8.8.8.8:53 238.179.250.142.in-addr.arpa udp
US 8.8.8.8:53 180.129.81.91.in-addr.arpa udp
US 8.8.8.8:53 c.pki.goog udp
US 8.8.8.8:53 35.200.250.142.in-addr.arpa udp
GB 142.250.200.35:80 c.pki.goog tcp
US 8.8.8.8:53 197.87.175.4.in-addr.arpa udp
US 8.8.8.8:53 o.pki.goog udp
GB 142.250.200.35:80 o.pki.goog tcp
US 8.8.8.8:53 198.187.3.20.in-addr.arpa udp
US 8.8.8.8:53 172.214.232.199.in-addr.arpa udp
GB 142.250.179.238:443 drive.google.com tcp
US 8.8.8.8:53 48.229.111.52.in-addr.arpa udp
US 8.8.8.8:53 83.210.23.2.in-addr.arpa udp
GB 142.250.179.238:443 drive.google.com tcp
US 8.8.8.8:53 21.49.80.91.in-addr.arpa udp
GB 142.250.179.238:443 drive.google.com tcp
US 8.8.8.8:53 drive.usercontent.google.com udp
GB 216.58.212.225:443 drive.usercontent.google.com tcp
US 8.8.8.8:53 o.pki.goog udp
GB 142.250.200.35:80 o.pki.goog tcp
US 8.8.8.8:53 225.212.58.216.in-addr.arpa udp

Files

C:\Users\Admin\AppData\Local\Temp\nsu79A6.tmp\System.dll

MD5 0d7ad4f45dc6f5aa87f606d0331c6901
SHA1 48df0911f0484cbe2a8cdd5362140b63c41ee457
SHA256 3eb38ae99653a7dbc724132ee240f6e5c4af4bfe7c01d31d23faf373f9f2eaca
SHA512 c07de7308cb54205e8bd703001a7fe4fd7796c9ac1b4bb330c77c872bf712b093645f40b80ce7127531fe6746a5b66e18ea073ab6a644934abed9bb64126fea9

memory/2468-13-0x00000000032A0000-0x000000000480A000-memory.dmp

memory/2468-14-0x0000000077E41000-0x0000000077F61000-memory.dmp

memory/2468-15-0x0000000074B35000-0x0000000074B36000-memory.dmp

memory/2468-16-0x00000000032A0000-0x000000000480A000-memory.dmp

memory/4280-17-0x00000000016E0000-0x0000000002C4A000-memory.dmp

memory/4280-18-0x0000000077EC8000-0x0000000077EC9000-memory.dmp

memory/4280-19-0x0000000077EE5000-0x0000000077EE6000-memory.dmp

memory/4280-20-0x00000000016E0000-0x0000000002C4A000-memory.dmp

memory/4280-22-0x0000000077E41000-0x0000000077F61000-memory.dmp

memory/4280-21-0x0000000000480000-0x00000000016D4000-memory.dmp

Analysis: behavioral3

Detonation Overview

Submitted

2024-12-11 02:45

Reported

2024-12-11 02:48

Platform

win7-20240903-en

Max time kernel

120s

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 2940 -s 220

Network

N/A

Files

N/A