Malware Analysis Report

2025-05-28 18:51

Sample ID 250111-c8ghcszmdt
Target 2c399d3af3092bf9b9d0ed6c4b7bef3ac082cf09d9947adc9df12d11a6fea3d1.exe
SHA256 2c399d3af3092bf9b9d0ed6c4b7bef3ac082cf09d9947adc9df12d11a6fea3d1
Tags
discovery guloader collection downloader evasion spyware stealer
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

2c399d3af3092bf9b9d0ed6c4b7bef3ac082cf09d9947adc9df12d11a6fea3d1

Threat Level: Known bad

The file 2c399d3af3092bf9b9d0ed6c4b7bef3ac082cf09d9947adc9df12d11a6fea3d1.exe was found to be: Known bad.

Malicious Activity Summary

discovery guloader collection downloader evasion spyware stealer

Guloader family

Guloader,Cloudeye

Disables Task Manager via registry modification

Loads dropped DLL

Reads user/profile data of local email clients

Reads user/profile data of web browsers

Looks up external IP address via web service

Accesses Microsoft Outlook profiles

Legitimate hosting services abused for malware hosting/C2

Suspicious use of NtCreateThreadExHideFromDebugger

Suspicious use of NtSetInformationThreadHideFromDebugger

Suspicious use of SetThreadContext

Program crash

Unsigned PE

System Location Discovery: System Language Discovery

Enumerates physical storage devices

Suspicious behavior: EnumeratesProcesses

Suspicious behavior: MapViewOfSection

Suspicious use of AdjustPrivilegeToken

outlook_office_path

outlook_win_path

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2025-01-11 02:44

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 02:44

Reported

2025-01-11 02:47

Platform

win7-20240903-en

Max time kernel

12s

Max time network

119s

Command Line

"C:\Users\Admin\AppData\Local\Temp\2c399d3af3092bf9b9d0ed6c4b7bef3ac082cf09d9947adc9df12d11a6fea3d1.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\2c399d3af3092bf9b9d0ed6c4b7bef3ac082cf09d9947adc9df12d11a6fea3d1.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\2c399d3af3092bf9b9d0ed6c4b7bef3ac082cf09d9947adc9df12d11a6fea3d1.exe

"C:\Users\Admin\AppData\Local\Temp\2c399d3af3092bf9b9d0ed6c4b7bef3ac082cf09d9947adc9df12d11a6fea3d1.exe"

Network

N/A

Files

\Users\Admin\AppData\Local\Temp\nst9A2F.tmp\System.dll

MD5 0d7ad4f45dc6f5aa87f606d0331c6901
SHA1 48df0911f0484cbe2a8cdd5362140b63c41ee457
SHA256 3eb38ae99653a7dbc724132ee240f6e5c4af4bfe7c01d31d23faf373f9f2eaca
SHA512 c07de7308cb54205e8bd703001a7fe4fd7796c9ac1b4bb330c77c872bf712b093645f40b80ce7127531fe6746a5b66e18ea073ab6a644934abed9bb64126fea9

memory/1800-15-0x00000000036F0000-0x000000000655A000-memory.dmp

memory/1800-20-0x00000000036F0000-0x000000000655A000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2025-01-11 02:44

Reported

2025-01-11 02:47

Platform

win10v2004-20241007-en

Max time kernel

149s

Max time network

150s

Command Line

"C:\Users\Admin\AppData\Local\Temp\2c399d3af3092bf9b9d0ed6c4b7bef3ac082cf09d9947adc9df12d11a6fea3d1.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-1-5-21-3442511616-637977696-3186306149-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676 C:\Users\Admin\AppData\Local\Temp\2c399d3af3092bf9b9d0ed6c4b7bef3ac082cf09d9947adc9df12d11a6fea3d1.exe N/A
Key opened \REGISTRY\USER\S-1-5-21-3442511616-637977696-3186306149-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676 C:\Users\Admin\AppData\Local\Temp\2c399d3af3092bf9b9d0ed6c4b7bef3ac082cf09d9947adc9df12d11a6fea3d1.exe N/A
Key opened \REGISTRY\USER\S-1-5-21-3442511616-637977696-3186306149-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676 C:\Users\Admin\AppData\Local\Temp\2c399d3af3092bf9b9d0ed6c4b7bef3ac082cf09d9947adc9df12d11a6fea3d1.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\2c399d3af3092bf9b9d0ed6c4b7bef3ac082cf09d9947adc9df12d11a6fea3d1.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\2c399d3af3092bf9b9d0ed6c4b7bef3ac082cf09d9947adc9df12d11a6fea3d1.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\2c399d3af3092bf9b9d0ed6c4b7bef3ac082cf09d9947adc9df12d11a6fea3d1.exe N/A

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\2c399d3af3092bf9b9d0ed6c4b7bef3ac082cf09d9947adc9df12d11a6fea3d1.exe N/A

Suspicious behavior: MapViewOfSection

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\2c399d3af3092bf9b9d0ed6c4b7bef3ac082cf09d9947adc9df12d11a6fea3d1.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\2c399d3af3092bf9b9d0ed6c4b7bef3ac082cf09d9947adc9df12d11a6fea3d1.exe N/A

outlook_office_path

Description Indicator Process Target
Key opened \REGISTRY\USER\S-1-5-21-3442511616-637977696-3186306149-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676 C:\Users\Admin\AppData\Local\Temp\2c399d3af3092bf9b9d0ed6c4b7bef3ac082cf09d9947adc9df12d11a6fea3d1.exe N/A

outlook_win_path

Description Indicator Process Target
Key opened \REGISTRY\USER\S-1-5-21-3442511616-637977696-3186306149-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676 C:\Users\Admin\AppData\Local\Temp\2c399d3af3092bf9b9d0ed6c4b7bef3ac082cf09d9947adc9df12d11a6fea3d1.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\2c399d3af3092bf9b9d0ed6c4b7bef3ac082cf09d9947adc9df12d11a6fea3d1.exe

"C:\Users\Admin\AppData\Local\Temp\2c399d3af3092bf9b9d0ed6c4b7bef3ac082cf09d9947adc9df12d11a6fea3d1.exe"

C:\Users\Admin\AppData\Local\Temp\2c399d3af3092bf9b9d0ed6c4b7bef3ac082cf09d9947adc9df12d11a6fea3d1.exe

"C:\Users\Admin\AppData\Local\Temp\2c399d3af3092bf9b9d0ed6c4b7bef3ac082cf09d9947adc9df12d11a6fea3d1.exe"

Network

Country Destination Domain Proto
US 8.8.8.8:53 97.17.167.52.in-addr.arpa udp
US 8.8.8.8:53 8.153.16.2.in-addr.arpa udp
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 drive.google.com udp
GB 172.217.169.78:443 drive.google.com tcp
US 8.8.8.8:53 c.pki.goog udp
GB 142.250.178.3:80 c.pki.goog tcp
US 8.8.8.8:53 o.pki.goog udp
GB 142.250.178.3:80 o.pki.goog tcp
US 8.8.8.8:53 78.169.217.172.in-addr.arpa udp
US 8.8.8.8:53 3.178.250.142.in-addr.arpa udp
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 73.247.226.132.in-addr.arpa udp
US 8.8.8.8:53 154.239.44.20.in-addr.arpa udp
US 8.8.8.8:53 reallyfreegeoip.org udp
US 104.21.32.1:443 reallyfreegeoip.org tcp
US 8.8.8.8:53 1.32.21.104.in-addr.arpa udp
US 8.8.8.8:53 197.87.175.4.in-addr.arpa udp
US 8.8.8.8:53 171.39.242.20.in-addr.arpa udp
US 8.8.8.8:53 134.130.81.91.in-addr.arpa udp
US 8.8.8.8:53 45.89.16.2.in-addr.arpa udp
US 8.8.8.8:53 29.243.111.52.in-addr.arpa udp
US 8.8.8.8:53 195.201.50.20.in-addr.arpa udp

Files

C:\Users\Admin\AppData\Local\Temp\nsgAF1E.tmp\System.dll

MD5 0d7ad4f45dc6f5aa87f606d0331c6901
SHA1 48df0911f0484cbe2a8cdd5362140b63c41ee457
SHA256 3eb38ae99653a7dbc724132ee240f6e5c4af4bfe7c01d31d23faf373f9f2eaca
SHA512 c07de7308cb54205e8bd703001a7fe4fd7796c9ac1b4bb330c77c872bf712b093645f40b80ce7127531fe6746a5b66e18ea073ab6a644934abed9bb64126fea9

memory/2672-13-0x00000000032A0000-0x000000000610A000-memory.dmp

memory/2672-14-0x0000000077A51000-0x0000000077B71000-memory.dmp

memory/2672-15-0x0000000074745000-0x0000000074746000-memory.dmp

memory/2672-16-0x00000000032A0000-0x000000000610A000-memory.dmp

memory/3592-17-0x00000000016E0000-0x000000000454A000-memory.dmp

memory/3592-30-0x0000000000480000-0x00000000016D4000-memory.dmp

memory/3592-32-0x0000000000480000-0x000000000049E000-memory.dmp

memory/3592-33-0x0000000037280000-0x0000000037824000-memory.dmp

memory/3592-34-0x00000000371A0000-0x000000003723C000-memory.dmp

memory/3592-35-0x00000000016E0000-0x000000000454A000-memory.dmp

memory/3592-37-0x0000000037C80000-0x0000000037D12000-memory.dmp

memory/3592-38-0x00000000378B0000-0x0000000037900000-memory.dmp

memory/3592-39-0x0000000037E30000-0x0000000037FF2000-memory.dmp

memory/3592-40-0x0000000038030000-0x000000003803A000-memory.dmp

Analysis: behavioral3

Detonation Overview

Submitted

2025-01-11 02:44

Reported

2025-01-11 02:47

Platform

win7-20240729-en

Max time kernel

118s

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 2720 -s 220

Network

N/A

Files

N/A

Analysis: behavioral4

Detonation Overview

Submitted

2025-01-11 02:44

Reported

2025-01-11 02:47

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 4384 wrote to memory of 2300 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 4384 wrote to memory of 2300 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 4384 wrote to memory of 2300 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 460 -p 2300 -ip 2300

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 2300 -s 612

Network

Country Destination Domain Proto
US 8.8.8.8:53 8.153.16.2.in-addr.arpa udp
US 8.8.8.8:53 154.239.44.20.in-addr.arpa udp
US 8.8.8.8:53 2.159.190.20.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 97.17.167.52.in-addr.arpa udp
US 8.8.8.8:53 197.87.175.4.in-addr.arpa udp
US 8.8.8.8:53 206.23.85.13.in-addr.arpa udp
US 8.8.8.8:53 24.66.18.2.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 11.227.111.52.in-addr.arpa udp
US 8.8.8.8:53 11.173.189.20.in-addr.arpa udp

Files

N/A