Malware Analysis Report

2025-05-28 18:51

Sample ID 250111-f4jnpswmet
Target d7aca08687c1ffc0b01ad90f5500c968796bebf8b60995363c8d7c19be48c562.exe
SHA256 d7aca08687c1ffc0b01ad90f5500c968796bebf8b60995363c8d7c19be48c562
Tags
guloader discovery downloader
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

d7aca08687c1ffc0b01ad90f5500c968796bebf8b60995363c8d7c19be48c562

Threat Level: Known bad

The file d7aca08687c1ffc0b01ad90f5500c968796bebf8b60995363c8d7c19be48c562.exe was found to be: Known bad.

Malicious Activity Summary

guloader discovery downloader

Guloader,Cloudeye

Guloader family

Loads dropped DLL

Legitimate hosting services abused for malware hosting/C2

Looks up external IP address via web service

Suspicious use of NtCreateThreadExHideFromDebugger

Suspicious use of NtSetInformationThreadHideFromDebugger

Suspicious use of SetThreadContext

Unsigned PE

Enumerates physical storage devices

Program crash

System Location Discovery: System Language Discovery

Suspicious use of WriteProcessMemory

Suspicious use of AdjustPrivilegeToken

Suspicious behavior: MapViewOfSection

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2025-01-11 05:25

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 05:25

Reported

2025-01-11 05:28

Platform

win10v2004-20241007-en

Max time kernel

93s

Max time network

147s

Command Line

"C:\Users\Admin\AppData\Local\Temp\d7aca08687c1ffc0b01ad90f5500c968796bebf8b60995363c8d7c19be48c562.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

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\d7aca08687c1ffc0b01ad90f5500c968796bebf8b60995363c8d7c19be48c562.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\d7aca08687c1ffc0b01ad90f5500c968796bebf8b60995363c8d7c19be48c562.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\d7aca08687c1ffc0b01ad90f5500c968796bebf8b60995363c8d7c19be48c562.exe N/A

Suspicious behavior: MapViewOfSection

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\d7aca08687c1ffc0b01ad90f5500c968796bebf8b60995363c8d7c19be48c562.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\d7aca08687c1ffc0b01ad90f5500c968796bebf8b60995363c8d7c19be48c562.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\d7aca08687c1ffc0b01ad90f5500c968796bebf8b60995363c8d7c19be48c562.exe

"C:\Users\Admin\AppData\Local\Temp\d7aca08687c1ffc0b01ad90f5500c968796bebf8b60995363c8d7c19be48c562.exe"

C:\Users\Admin\AppData\Local\Temp\d7aca08687c1ffc0b01ad90f5500c968796bebf8b60995363c8d7c19be48c562.exe

"C:\Users\Admin\AppData\Local\Temp\d7aca08687c1ffc0b01ad90f5500c968796bebf8b60995363c8d7c19be48c562.exe"

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 432 -p 2836 -ip 2836

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 2836 -s 2288

Network

Country Destination Domain Proto
US 8.8.8.8:53 97.17.167.52.in-addr.arpa udp
US 8.8.8.8:53 181.129.81.91.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 8.8.8.8:53 104.219.191.52.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 142.250.178.3:80 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 8.8.8.8:53 206.221.208.4.in-addr.arpa udp
US 8.8.8.8:53 238.179.250.142.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
JP 132.226.8.169:80 checkip.dyndns.org tcp
US 8.8.8.8:53 169.8.226.132.in-addr.arpa udp
US 8.8.8.8:53 50.23.12.20.in-addr.arpa udp
US 8.8.8.8:53 198.187.3.20.in-addr.arpa udp
US 8.8.8.8:53 29.243.111.52.in-addr.arpa udp

Files

C:\Users\Admin\AppData\Local\Temp\nsiCE00.tmp\System.dll

MD5 0d7ad4f45dc6f5aa87f606d0331c6901
SHA1 48df0911f0484cbe2a8cdd5362140b63c41ee457
SHA256 3eb38ae99653a7dbc724132ee240f6e5c4af4bfe7c01d31d23faf373f9f2eaca
SHA512 c07de7308cb54205e8bd703001a7fe4fd7796c9ac1b4bb330c77c872bf712b093645f40b80ce7127531fe6746a5b66e18ea073ab6a644934abed9bb64126fea9

memory/996-13-0x00000000032E0000-0x00000000063DB000-memory.dmp

memory/996-14-0x0000000077E31000-0x0000000077F51000-memory.dmp

memory/996-15-0x0000000074B25000-0x0000000074B26000-memory.dmp

memory/996-16-0x00000000032E0000-0x00000000063DB000-memory.dmp

memory/996-17-0x00000000032E0000-0x00000000063DB000-memory.dmp

memory/2836-18-0x00000000016E0000-0x00000000047DB000-memory.dmp

memory/2836-28-0x0000000000480000-0x00000000016D4000-memory.dmp

memory/2836-32-0x00000000016E0000-0x00000000047DB000-memory.dmp

memory/2836-33-0x0000000000480000-0x00000000016D4000-memory.dmp

memory/2836-34-0x0000000000480000-0x000000000049E000-memory.dmp

memory/2836-35-0x0000000037560000-0x0000000037B04000-memory.dmp

memory/2836-36-0x0000000037B10000-0x0000000037BAC000-memory.dmp

memory/2836-38-0x00000000016E0000-0x00000000047DB000-memory.dmp

Analysis: behavioral3

Detonation Overview

Submitted

2025-01-11 05:25

Reported

2025-01-11 05:28

Platform

win7-20241010-en

Max time kernel

13s

Max time network

19s

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 2956 -s 224

Network

N/A

Files

N/A

Analysis: behavioral4

Detonation Overview

Submitted

2025-01-11 05:25

Reported

2025-01-11 05:28

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 4224 wrote to memory of 1764 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 4224 wrote to memory of 1764 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 4224 wrote to memory of 1764 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 1764 -ip 1764

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 1764 -s 612

Network

Country Destination Domain Proto
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 217.106.137.52.in-addr.arpa udp
US 8.8.8.8:53 172.214.232.199.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 8.8.8.8:53 104.219.191.52.in-addr.arpa udp
US 8.8.8.8:53 53.210.109.20.in-addr.arpa udp
US 8.8.8.8:53 15.164.165.52.in-addr.arpa udp
US 8.8.8.8:53 113.168.16.2.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 20.49.80.91.in-addr.arpa udp
US 8.8.8.8:53 29.243.111.52.in-addr.arpa udp
US 8.8.8.8:53 5.173.189.20.in-addr.arpa udp

Files

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2025-01-11 05:25

Reported

2025-01-11 05:28

Platform

win7-20240903-en

Max time kernel

12s

Max time network

125s

Command Line

"C:\Users\Admin\AppData\Local\Temp\d7aca08687c1ffc0b01ad90f5500c968796bebf8b60995363c8d7c19be48c562.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\d7aca08687c1ffc0b01ad90f5500c968796bebf8b60995363c8d7c19be48c562.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\d7aca08687c1ffc0b01ad90f5500c968796bebf8b60995363c8d7c19be48c562.exe

"C:\Users\Admin\AppData\Local\Temp\d7aca08687c1ffc0b01ad90f5500c968796bebf8b60995363c8d7c19be48c562.exe"

Network

N/A

Files

\Users\Admin\AppData\Local\Temp\nsjC361.tmp\System.dll

MD5 0d7ad4f45dc6f5aa87f606d0331c6901
SHA1 48df0911f0484cbe2a8cdd5362140b63c41ee457
SHA256 3eb38ae99653a7dbc724132ee240f6e5c4af4bfe7c01d31d23faf373f9f2eaca
SHA512 c07de7308cb54205e8bd703001a7fe4fd7796c9ac1b4bb330c77c872bf712b093645f40b80ce7127531fe6746a5b66e18ea073ab6a644934abed9bb64126fea9

memory/2548-15-0x0000000003550000-0x000000000664B000-memory.dmp

memory/2548-20-0x0000000003550000-0x000000000664B000-memory.dmp