Malware Analysis Report

2025-05-28 18:51

Sample ID 250111-gfvlqszkfn
Target e8e552351ba3c8a3f713a970b114fb7b80bd6474f62a88b977fe3bc35b57e9a7.exe
SHA256 e8e552351ba3c8a3f713a970b114fb7b80bd6474f62a88b977fe3bc35b57e9a7
Tags
guloader collection discovery downloader evasion spyware stealer
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V15

Analysis: static1

Detonation Overview

Signatures

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: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

e8e552351ba3c8a3f713a970b114fb7b80bd6474f62a88b977fe3bc35b57e9a7

Threat Level: Known bad

The file e8e552351ba3c8a3f713a970b114fb7b80bd6474f62a88b977fe3bc35b57e9a7.exe was found to be: Known bad.

Malicious Activity Summary

guloader collection discovery downloader evasion spyware stealer

Guloader,Cloudeye

Guloader family

Disables Task Manager via registry modification

Reads user/profile data of web browsers

Reads user/profile data of local email clients

Loads dropped DLL

Accesses Microsoft Outlook profiles

Legitimate hosting services abused for malware hosting/C2

Looks up external IP address via web service

Suspicious use of NtSetInformationThreadHideFromDebugger

Suspicious use of NtCreateThreadExHideFromDebugger

Suspicious use of SetThreadContext

Enumerates physical storage devices

Program crash

Unsigned PE

System Location Discovery: System Language Discovery

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

Suspicious behavior: MapViewOfSection

outlook_office_path

Suspicious behavior: EnumeratesProcesses

outlook_win_path

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2025-01-11 05:45

Signatures

Unsigned PE

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

Analysis: behavioral2

Detonation Overview

Submitted

2025-01-11 05:45

Reported

2025-01-11 05:47

Platform

win10v2004-20241007-en

Max time kernel

148s

Max time network

146s

Command Line

"C:\Users\Admin\AppData\Local\Temp\e8e552351ba3c8a3f713a970b114fb7b80bd6474f62a88b977fe3bc35b57e9a7.exe"

Signatures

Guloader family

guloader

Guloader,Cloudeye

downloader guloader

Disables Task Manager via registry modification

evasion

Reads user/profile data of local email clients

spyware stealer

Reads user/profile data of web browsers

spyware stealer

Accesses Microsoft Outlook profiles

collection
Description Indicator Process Target
Key opened \REGISTRY\USER\S-1-5-21-4089630652-1596403869-279772308-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676 C:\Users\Admin\AppData\Local\Temp\e8e552351ba3c8a3f713a970b114fb7b80bd6474f62a88b977fe3bc35b57e9a7.exe N/A
Key opened \REGISTRY\USER\S-1-5-21-4089630652-1596403869-279772308-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676 C:\Users\Admin\AppData\Local\Temp\e8e552351ba3c8a3f713a970b114fb7b80bd6474f62a88b977fe3bc35b57e9a7.exe N/A
Key opened \REGISTRY\USER\S-1-5-21-4089630652-1596403869-279772308-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676 C:\Users\Admin\AppData\Local\Temp\e8e552351ba3c8a3f713a970b114fb7b80bd6474f62a88b977fe3bc35b57e9a7.exe N/A

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

Looks up external IP address via web service

Description Indicator Process Target
N/A checkip.dyndns.org N/A N/A
N/A reallyfreegeoip.org N/A N/A
N/A reallyfreegeoip.org N/A N/A

Suspicious use of NtCreateThreadExHideFromDebugger

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\e8e552351ba3c8a3f713a970b114fb7b80bd6474f62a88b977fe3bc35b57e9a7.exe 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\e8e552351ba3c8a3f713a970b114fb7b80bd6474f62a88b977fe3bc35b57e9a7.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\e8e552351ba3c8a3f713a970b114fb7b80bd6474f62a88b977fe3bc35b57e9a7.exe N/A

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\e8e552351ba3c8a3f713a970b114fb7b80bd6474f62a88b977fe3bc35b57e9a7.exe N/A

Suspicious behavior: MapViewOfSection

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\e8e552351ba3c8a3f713a970b114fb7b80bd6474f62a88b977fe3bc35b57e9a7.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\e8e552351ba3c8a3f713a970b114fb7b80bd6474f62a88b977fe3bc35b57e9a7.exe N/A

outlook_office_path

Description Indicator Process Target
Key opened \REGISTRY\USER\S-1-5-21-4089630652-1596403869-279772308-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676 C:\Users\Admin\AppData\Local\Temp\e8e552351ba3c8a3f713a970b114fb7b80bd6474f62a88b977fe3bc35b57e9a7.exe N/A

outlook_win_path

Description Indicator Process Target
Key opened \REGISTRY\USER\S-1-5-21-4089630652-1596403869-279772308-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676 C:\Users\Admin\AppData\Local\Temp\e8e552351ba3c8a3f713a970b114fb7b80bd6474f62a88b977fe3bc35b57e9a7.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\e8e552351ba3c8a3f713a970b114fb7b80bd6474f62a88b977fe3bc35b57e9a7.exe

"C:\Users\Admin\AppData\Local\Temp\e8e552351ba3c8a3f713a970b114fb7b80bd6474f62a88b977fe3bc35b57e9a7.exe"

C:\Users\Admin\AppData\Local\Temp\e8e552351ba3c8a3f713a970b114fb7b80bd6474f62a88b977fe3bc35b57e9a7.exe

"C:\Users\Admin\AppData\Local\Temp\e8e552351ba3c8a3f713a970b114fb7b80bd6474f62a88b977fe3bc35b57e9a7.exe"

Network

Country Destination Domain Proto
US 8.8.8.8:53 154.239.44.20.in-addr.arpa udp
US 8.8.8.8:53 136.32.126.40.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 drive.google.com udp
GB 142.250.179.238:443 drive.google.com tcp
US 8.8.8.8:53 c.pki.goog udp
GB 142.250.200.35:80 c.pki.goog tcp
US 8.8.8.8:53 o.pki.goog udp
US 8.8.8.8:53 238.179.250.142.in-addr.arpa udp
US 8.8.8.8:53 35.200.250.142.in-addr.arpa udp
GB 142.250.200.35:80 o.pki.goog tcp
US 8.8.8.8:53 drive.usercontent.google.com udp
GB 216.58.212.193:443 drive.usercontent.google.com tcp
US 8.8.8.8:53 193.212.58.216.in-addr.arpa udp
US 8.8.8.8:53 checkip.dyndns.org udp
BR 132.226.247.73:80 checkip.dyndns.org tcp
US 8.8.8.8:53 reallyfreegeoip.org udp
US 104.21.16.1:443 reallyfreegeoip.org tcp
US 8.8.8.8:53 73.247.226.132.in-addr.arpa udp
US 8.8.8.8:53 1.16.21.104.in-addr.arpa udp
US 8.8.8.8:53 241.150.49.20.in-addr.arpa udp
US 8.8.8.8:53 api.telegram.org udp
NL 149.154.167.220:443 api.telegram.org tcp
US 8.8.8.8:53 220.167.154.149.in-addr.arpa udp
US 8.8.8.8:53 53.210.109.20.in-addr.arpa udp
US 8.8.8.8:53 206.23.85.13.in-addr.arpa udp
US 8.8.8.8:53 29.243.111.52.in-addr.arpa udp

Files

C:\Users\Admin\AppData\Local\Temp\nsy8FCE.tmp\System.dll

MD5 0d7ad4f45dc6f5aa87f606d0331c6901
SHA1 48df0911f0484cbe2a8cdd5362140b63c41ee457
SHA256 3eb38ae99653a7dbc724132ee240f6e5c4af4bfe7c01d31d23faf373f9f2eaca
SHA512 c07de7308cb54205e8bd703001a7fe4fd7796c9ac1b4bb330c77c872bf712b093645f40b80ce7127531fe6746a5b66e18ea073ab6a644934abed9bb64126fea9

memory/4988-13-0x00000000032A0000-0x00000000055FC000-memory.dmp

memory/4988-14-0x0000000077301000-0x0000000077421000-memory.dmp

memory/4988-15-0x0000000073FF5000-0x0000000073FF6000-memory.dmp

memory/4988-16-0x00000000032A0000-0x00000000055FC000-memory.dmp

memory/2488-17-0x00000000016E0000-0x0000000003A3C000-memory.dmp

memory/2488-30-0x0000000000480000-0x00000000016D4000-memory.dmp

memory/2488-31-0x0000000000480000-0x000000000049E000-memory.dmp

memory/2488-32-0x00000000367B0000-0x0000000036D54000-memory.dmp

memory/2488-33-0x0000000036D60000-0x0000000036DFC000-memory.dmp

memory/2488-35-0x00000000016E0000-0x0000000003A3C000-memory.dmp

memory/2488-36-0x00000000371D0000-0x0000000037262000-memory.dmp

memory/2488-37-0x0000000037280000-0x00000000372D0000-memory.dmp

memory/2488-38-0x0000000037320000-0x00000000374E2000-memory.dmp

memory/2488-39-0x00000000375A0000-0x00000000375AA000-memory.dmp

Analysis: behavioral3

Detonation Overview

Submitted

2025-01-11 05:45

Reported

2025-01-11 05:47

Platform

win7-20240903-en

Max time kernel

117s

Max time network

118s

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 2684 -s 220

Network

N/A

Files

N/A

Analysis: behavioral4

Detonation Overview

Submitted

2025-01-11 05:45

Reported

2025-01-11 05:47

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 4120 wrote to memory of 4836 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 4120 wrote to memory of 4836 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 4120 wrote to memory of 4836 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 364 -p 4836 -ip 4836

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 4836 -s 612

Network

Country Destination Domain Proto
US 8.8.8.8:53 241.150.49.20.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 71.31.126.40.in-addr.arpa udp
US 8.8.8.8:53 217.106.137.52.in-addr.arpa udp
US 8.8.8.8:53 209.205.72.20.in-addr.arpa udp
US 8.8.8.8:53 50.23.12.20.in-addr.arpa udp
US 8.8.8.8:53 241.42.69.40.in-addr.arpa udp
US 8.8.8.8:53 19.229.111.52.in-addr.arpa udp
US 8.8.8.8:53 15.173.189.20.in-addr.arpa udp

Files

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2025-01-11 05:45

Reported

2025-01-11 05:47

Platform

win7-20240903-en

Max time kernel

9s

Max time network

16s

Command Line

"C:\Users\Admin\AppData\Local\Temp\e8e552351ba3c8a3f713a970b114fb7b80bd6474f62a88b977fe3bc35b57e9a7.exe"

Signatures

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\e8e552351ba3c8a3f713a970b114fb7b80bd6474f62a88b977fe3bc35b57e9a7.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\e8e552351ba3c8a3f713a970b114fb7b80bd6474f62a88b977fe3bc35b57e9a7.exe

"C:\Users\Admin\AppData\Local\Temp\e8e552351ba3c8a3f713a970b114fb7b80bd6474f62a88b977fe3bc35b57e9a7.exe"

Network

N/A

Files

\Users\Admin\AppData\Local\Temp\nsoFAF4.tmp\System.dll

MD5 0d7ad4f45dc6f5aa87f606d0331c6901
SHA1 48df0911f0484cbe2a8cdd5362140b63c41ee457
SHA256 3eb38ae99653a7dbc724132ee240f6e5c4af4bfe7c01d31d23faf373f9f2eaca
SHA512 c07de7308cb54205e8bd703001a7fe4fd7796c9ac1b4bb330c77c872bf712b093645f40b80ce7127531fe6746a5b66e18ea073ab6a644934abed9bb64126fea9

memory/2660-15-0x0000000003740000-0x0000000005A9C000-memory.dmp

memory/2660-20-0x0000000003740000-0x0000000005A9C000-memory.dmp