Malware Analysis Report

2025-04-03 14:22

Sample ID 241210-d8s2tsxpar
Target cb076958b9db298f34a9eeaafc4796f6d902b19b1696b76179db10612d371608.exe
SHA256 cb076958b9db298f34a9eeaafc4796f6d902b19b1696b76179db10612d371608
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

cb076958b9db298f34a9eeaafc4796f6d902b19b1696b76179db10612d371608

Threat Level: Known bad

The file cb076958b9db298f34a9eeaafc4796f6d902b19b1696b76179db10612d371608.exe was found to be: Known bad.

Malicious Activity Summary

discovery guloader collection downloader evasion spyware stealer

Guloader,Cloudeye

Guloader family

Disables Task Manager via registry modification

Reads user/profile data of web browsers

Loads dropped DLL

Reads user/profile data of local email clients

Legitimate hosting services abused for malware hosting/C2

Accesses Microsoft Outlook profiles

Looks up external IP address via web service

Suspicious use of NtCreateThreadExHideFromDebugger

Suspicious use of NtSetInformationThreadHideFromDebugger

Suspicious use of SetThreadContext

Program crash

Enumerates physical storage devices

Unsigned PE

System Location Discovery: System Language Discovery

Suspicious behavior: EnumeratesProcesses

outlook_win_path

Suspicious behavior: MapViewOfSection

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

outlook_office_path

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-12-10 03:41

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

2024-12-10 03:41

Reported

2024-12-10 03:43

Platform

win7-20241023-en

Max time kernel

122s

Max time network

123s

Command Line

"C:\Users\Admin\AppData\Local\Temp\cb076958b9db298f34a9eeaafc4796f6d902b19b1696b76179db10612d371608.exe"

Signatures

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

Suspicious use of NtCreateThreadExHideFromDebugger

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\cb076958b9db298f34a9eeaafc4796f6d902b19b1696b76179db10612d371608.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\cb076958b9db298f34a9eeaafc4796f6d902b19b1696b76179db10612d371608.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\cb076958b9db298f34a9eeaafc4796f6d902b19b1696b76179db10612d371608.exe N/A

Suspicious behavior: MapViewOfSection

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\cb076958b9db298f34a9eeaafc4796f6d902b19b1696b76179db10612d371608.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\cb076958b9db298f34a9eeaafc4796f6d902b19b1696b76179db10612d371608.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 1640 wrote to memory of 2380 N/A C:\Users\Admin\AppData\Local\Temp\cb076958b9db298f34a9eeaafc4796f6d902b19b1696b76179db10612d371608.exe C:\Users\Admin\AppData\Local\Temp\cb076958b9db298f34a9eeaafc4796f6d902b19b1696b76179db10612d371608.exe
PID 1640 wrote to memory of 2380 N/A C:\Users\Admin\AppData\Local\Temp\cb076958b9db298f34a9eeaafc4796f6d902b19b1696b76179db10612d371608.exe C:\Users\Admin\AppData\Local\Temp\cb076958b9db298f34a9eeaafc4796f6d902b19b1696b76179db10612d371608.exe
PID 1640 wrote to memory of 2380 N/A C:\Users\Admin\AppData\Local\Temp\cb076958b9db298f34a9eeaafc4796f6d902b19b1696b76179db10612d371608.exe C:\Users\Admin\AppData\Local\Temp\cb076958b9db298f34a9eeaafc4796f6d902b19b1696b76179db10612d371608.exe
PID 1640 wrote to memory of 2380 N/A C:\Users\Admin\AppData\Local\Temp\cb076958b9db298f34a9eeaafc4796f6d902b19b1696b76179db10612d371608.exe C:\Users\Admin\AppData\Local\Temp\cb076958b9db298f34a9eeaafc4796f6d902b19b1696b76179db10612d371608.exe
PID 1640 wrote to memory of 2380 N/A C:\Users\Admin\AppData\Local\Temp\cb076958b9db298f34a9eeaafc4796f6d902b19b1696b76179db10612d371608.exe C:\Users\Admin\AppData\Local\Temp\cb076958b9db298f34a9eeaafc4796f6d902b19b1696b76179db10612d371608.exe
PID 1640 wrote to memory of 2380 N/A C:\Users\Admin\AppData\Local\Temp\cb076958b9db298f34a9eeaafc4796f6d902b19b1696b76179db10612d371608.exe C:\Users\Admin\AppData\Local\Temp\cb076958b9db298f34a9eeaafc4796f6d902b19b1696b76179db10612d371608.exe

Processes

C:\Users\Admin\AppData\Local\Temp\cb076958b9db298f34a9eeaafc4796f6d902b19b1696b76179db10612d371608.exe

"C:\Users\Admin\AppData\Local\Temp\cb076958b9db298f34a9eeaafc4796f6d902b19b1696b76179db10612d371608.exe"

C:\Users\Admin\AppData\Local\Temp\cb076958b9db298f34a9eeaafc4796f6d902b19b1696b76179db10612d371608.exe

"C:\Users\Admin\AppData\Local\Temp\cb076958b9db298f34a9eeaafc4796f6d902b19b1696b76179db10612d371608.exe"

Network

Country Destination Domain Proto
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 drive.usercontent.google.com udp
GB 216.58.212.193:443 drive.usercontent.google.com tcp
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 www.microsoft.com udp
GB 95.100.245.144:80 www.microsoft.com tcp

Files

\Users\Admin\AppData\Local\Temp\nsyC718.tmp\System.dll

MD5 fc90dfb694d0e17b013d6f818bce41b0
SHA1 3243969886d640af3bfa442728b9f0dff9d5f5b0
SHA256 7fe77ca13121a113c59630a3dba0c8aaa6372e8082393274da8f8608c4ce4528
SHA512 324f13aa7a33c6408e2a57c3484d1691ecee7c3c1366de2bb8978c8dc66b18425d8cab5a32d1702c13c43703e36148a022263de7166afdce141da2b01169f1c6

memory/1640-15-0x0000000003360000-0x000000000662D000-memory.dmp

memory/1640-17-0x0000000077200000-0x00000000773A9000-memory.dmp

memory/1640-16-0x0000000077201000-0x0000000077302000-memory.dmp

memory/1640-18-0x0000000003360000-0x000000000662D000-memory.dmp

memory/2380-38-0x00000000004B0000-0x0000000001512000-memory.dmp

memory/2380-39-0x00000000004B0000-0x0000000001512000-memory.dmp

memory/2380-40-0x00000000004B0000-0x00000000004CE000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-12-10 03:41

Reported

2024-12-10 03:43

Platform

win10v2004-20241007-en

Max time kernel

149s

Max time network

150s

Command Line

"C:\Users\Admin\AppData\Local\Temp\cb076958b9db298f34a9eeaafc4796f6d902b19b1696b76179db10612d371608.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-1-5-21-940901362-3608833189-1915618603-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676 C:\Users\Admin\AppData\Local\Temp\cb076958b9db298f34a9eeaafc4796f6d902b19b1696b76179db10612d371608.exe N/A
Key opened \REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676 C:\Users\Admin\AppData\Local\Temp\cb076958b9db298f34a9eeaafc4796f6d902b19b1696b76179db10612d371608.exe N/A
Key opened \REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676 C:\Users\Admin\AppData\Local\Temp\cb076958b9db298f34a9eeaafc4796f6d902b19b1696b76179db10612d371608.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

Suspicious use of NtCreateThreadExHideFromDebugger

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\cb076958b9db298f34a9eeaafc4796f6d902b19b1696b76179db10612d371608.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\cb076958b9db298f34a9eeaafc4796f6d902b19b1696b76179db10612d371608.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\cb076958b9db298f34a9eeaafc4796f6d902b19b1696b76179db10612d371608.exe N/A

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\cb076958b9db298f34a9eeaafc4796f6d902b19b1696b76179db10612d371608.exe N/A

Suspicious behavior: MapViewOfSection

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\cb076958b9db298f34a9eeaafc4796f6d902b19b1696b76179db10612d371608.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\cb076958b9db298f34a9eeaafc4796f6d902b19b1696b76179db10612d371608.exe N/A

outlook_office_path

Description Indicator Process Target
Key opened \REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676 C:\Users\Admin\AppData\Local\Temp\cb076958b9db298f34a9eeaafc4796f6d902b19b1696b76179db10612d371608.exe N/A

outlook_win_path

Description Indicator Process Target
Key opened \REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676 C:\Users\Admin\AppData\Local\Temp\cb076958b9db298f34a9eeaafc4796f6d902b19b1696b76179db10612d371608.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\cb076958b9db298f34a9eeaafc4796f6d902b19b1696b76179db10612d371608.exe

"C:\Users\Admin\AppData\Local\Temp\cb076958b9db298f34a9eeaafc4796f6d902b19b1696b76179db10612d371608.exe"

C:\Users\Admin\AppData\Local\Temp\cb076958b9db298f34a9eeaafc4796f6d902b19b1696b76179db10612d371608.exe

"C:\Users\Admin\AppData\Local\Temp\cb076958b9db298f34a9eeaafc4796f6d902b19b1696b76179db10612d371608.exe"

Network

Country Destination Domain Proto
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 241.150.49.20.in-addr.arpa udp
US 8.8.8.8:53 83.210.23.2.in-addr.arpa udp
US 8.8.8.8:53 140.32.126.40.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 196.249.167.52.in-addr.arpa udp
US 8.8.8.8:53 13.86.106.20.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
US 158.101.44.242:80 checkip.dyndns.org tcp
US 8.8.8.8:53 reallyfreegeoip.org udp
US 172.67.177.134:443 reallyfreegeoip.org tcp
US 8.8.8.8:53 242.44.101.158.in-addr.arpa udp
US 8.8.8.8:53 134.177.67.172.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 8.8.8.8:53 198.187.3.20.in-addr.arpa udp
US 8.8.8.8:53 134.71.91.104.in-addr.arpa udp
US 8.8.8.8:53 88.210.23.2.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 5.173.189.20.in-addr.arpa udp

Files

C:\Users\Admin\AppData\Local\Temp\nst9B77.tmp\System.dll

MD5 fc90dfb694d0e17b013d6f818bce41b0
SHA1 3243969886d640af3bfa442728b9f0dff9d5f5b0
SHA256 7fe77ca13121a113c59630a3dba0c8aaa6372e8082393274da8f8608c4ce4528
SHA512 324f13aa7a33c6408e2a57c3484d1691ecee7c3c1366de2bb8978c8dc66b18425d8cab5a32d1702c13c43703e36148a022263de7166afdce141da2b01169f1c6

memory/3484-15-0x00000000032C0000-0x000000000658D000-memory.dmp

memory/3484-16-0x0000000077811000-0x0000000077931000-memory.dmp

memory/3484-17-0x0000000010004000-0x0000000010005000-memory.dmp

memory/3484-18-0x00000000032C0000-0x000000000658D000-memory.dmp

memory/1748-31-0x00000000004B0000-0x0000000001704000-memory.dmp

memory/1748-32-0x00000000004B0000-0x0000000001704000-memory.dmp

memory/1748-33-0x00000000004B0000-0x00000000004CE000-memory.dmp

memory/1748-34-0x00000000376C0000-0x0000000037C64000-memory.dmp

memory/1748-35-0x00000000374D0000-0x000000003756C000-memory.dmp

memory/1748-36-0x0000000037FB0000-0x0000000038042000-memory.dmp

memory/1748-37-0x0000000037650000-0x00000000376A0000-memory.dmp

memory/1748-38-0x0000000038170000-0x0000000038332000-memory.dmp

memory/1748-39-0x0000000038400000-0x000000003840A000-memory.dmp

Analysis: behavioral3

Detonation Overview

Submitted

2024-12-10 03:41

Reported

2024-12-10 03:43

Platform

win7-20240708-en

Max time kernel

121s

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 2332 -s 224

Network

N/A

Files

N/A

Analysis: behavioral4

Detonation Overview

Submitted

2024-12-10 03:41

Reported

2024-12-10 03:43

Platform

win10v2004-20241007-en

Max time kernel

148s

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 444 wrote to memory of 3996 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 444 wrote to memory of 3996 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 444 wrote to memory of 3996 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 3996 -ip 3996

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 3996 -s 612

Network

Country Destination Domain Proto
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 228.249.119.40.in-addr.arpa udp
US 8.8.8.8:53 21.49.80.91.in-addr.arpa udp
US 8.8.8.8:53 14.160.190.20.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 13.86.106.20.in-addr.arpa udp
US 8.8.8.8:53 200.163.202.172.in-addr.arpa udp
US 8.8.8.8:53 18.31.95.13.in-addr.arpa udp
US 8.8.8.8:53 140.71.91.104.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp

Files

N/A