Malware Analysis Report

2024-11-15 10:22

Sample ID 241106-r1vscasarf
Target 736c7e43912f503e8c2a91a5f64c95ee3f1f817d20acbb306fba3eb9b83ba24b.exe
SHA256 736c7e43912f503e8c2a91a5f64c95ee3f1f817d20acbb306fba3eb9b83ba24b
Tags
discovery guloader downloader
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V15

Analysis: static1

Detonation Overview

Signatures

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: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

736c7e43912f503e8c2a91a5f64c95ee3f1f817d20acbb306fba3eb9b83ba24b

Threat Level: Known bad

The file 736c7e43912f503e8c2a91a5f64c95ee3f1f817d20acbb306fba3eb9b83ba24b.exe was found to be: Known bad.

Malicious Activity Summary

discovery guloader downloader

Guloader,Cloudeye

Guloader family

Loads dropped DLL

Legitimate hosting services abused for malware hosting/C2

Suspicious use of NtCreateThreadExHideFromDebugger

Suspicious use of NtSetInformationThreadHideFromDebugger

Suspicious use of SetThreadContext

Drops file in Windows directory

Drops file in Program Files directory

Program crash

System Location Discovery: System Language Discovery

Unsigned PE

Enumerates physical storage devices

NSIS installer

Suspicious use of WriteProcessMemory

Suspicious behavior: MapViewOfSection

Suspicious behavior: EnumeratesProcesses

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-11-06 14:40

Signatures

Unsigned PE

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

NSIS installer

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

Analysis: behavioral3

Detonation Overview

Submitted

2024-11-06 14:40

Reported

2024-11-06 14:42

Platform

win7-20240903-en

Max time kernel

120s

Max time network

121s

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 2692 -s 224

Network

N/A

Files

N/A

Analysis: behavioral4

Detonation Overview

Submitted

2024-11-06 14:40

Reported

2024-11-06 14:42

Platform

win10v2004-20241007-en

Max time kernel

93s

Max time network

137s

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 4752 wrote to memory of 1936 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 4752 wrote to memory of 1936 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 4752 wrote to memory of 1936 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 428 -p 1936 -ip 1936

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 1936 -s 612

Network

Country Destination Domain Proto
US 8.8.8.8:53 104.219.191.52.in-addr.arpa udp
US 8.8.8.8:53 88.210.23.2.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 8.8.8.8:53 217.106.137.52.in-addr.arpa udp
US 8.8.8.8:53 232.168.11.51.in-addr.arpa udp
US 8.8.8.8:53 200.163.202.172.in-addr.arpa udp
US 8.8.8.8:53 206.23.85.13.in-addr.arpa udp
US 8.8.8.8:53 75.117.19.2.in-addr.arpa udp
US 8.8.8.8:53 83.210.23.2.in-addr.arpa udp
US 8.8.8.8:53 29.243.111.52.in-addr.arpa udp

Files

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-11-06 14:40

Reported

2024-11-06 14:42

Platform

win7-20240903-en

Max time kernel

119s

Max time network

120s

Command Line

"C:\Users\Admin\AppData\Local\Temp\736c7e43912f503e8c2a91a5f64c95ee3f1f817d20acbb306fba3eb9b83ba24b.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

Suspicious use of NtCreateThreadExHideFromDebugger

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\736c7e43912f503e8c2a91a5f64c95ee3f1f817d20acbb306fba3eb9b83ba24b.exe N/A

Drops file in Program Files directory

Description Indicator Process Target
File opened for modification C:\Program Files (x86)\Common Files\Reoil.mul C:\Users\Admin\AppData\Local\Temp\736c7e43912f503e8c2a91a5f64c95ee3f1f817d20acbb306fba3eb9b83ba24b.exe N/A

Drops file in Windows directory

Description Indicator Process Target
File opened for modification C:\Windows\Fonts\Spodium39.int C:\Users\Admin\AppData\Local\Temp\736c7e43912f503e8c2a91a5f64c95ee3f1f817d20acbb306fba3eb9b83ba24b.exe N/A
File opened for modification C:\Windows\Belringernes\Dermatophony.ini C:\Users\Admin\AppData\Local\Temp\736c7e43912f503e8c2a91a5f64c95ee3f1f817d20acbb306fba3eb9b83ba24b.exe N/A
File opened for modification C:\Windows\resources\nringsmiddelet.ini C:\Users\Admin\AppData\Local\Temp\736c7e43912f503e8c2a91a5f64c95ee3f1f817d20acbb306fba3eb9b83ba24b.exe N/A
File opened for modification C:\Windows\resources\stenhjsplanternes\fordreves.ini C:\Users\Admin\AppData\Local\Temp\736c7e43912f503e8c2a91a5f64c95ee3f1f817d20acbb306fba3eb9b83ba24b.exe N/A
File opened for modification C:\Windows\Fonts\karrooers.ini C:\Users\Admin\AppData\Local\Temp\736c7e43912f503e8c2a91a5f64c95ee3f1f817d20acbb306fba3eb9b83ba24b.exe N/A
File opened for modification C:\Windows\Fonts\brunsttiderne.tri C:\Users\Admin\AppData\Local\Temp\736c7e43912f503e8c2a91a5f64c95ee3f1f817d20acbb306fba3eb9b83ba24b.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\736c7e43912f503e8c2a91a5f64c95ee3f1f817d20acbb306fba3eb9b83ba24b.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\736c7e43912f503e8c2a91a5f64c95ee3f1f817d20acbb306fba3eb9b83ba24b.exe N/A

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\736c7e43912f503e8c2a91a5f64c95ee3f1f817d20acbb306fba3eb9b83ba24b.exe N/A

Suspicious behavior: MapViewOfSection

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\736c7e43912f503e8c2a91a5f64c95ee3f1f817d20acbb306fba3eb9b83ba24b.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2660 wrote to memory of 2668 N/A C:\Users\Admin\AppData\Local\Temp\736c7e43912f503e8c2a91a5f64c95ee3f1f817d20acbb306fba3eb9b83ba24b.exe C:\Users\Admin\AppData\Local\Temp\736c7e43912f503e8c2a91a5f64c95ee3f1f817d20acbb306fba3eb9b83ba24b.exe
PID 2660 wrote to memory of 2668 N/A C:\Users\Admin\AppData\Local\Temp\736c7e43912f503e8c2a91a5f64c95ee3f1f817d20acbb306fba3eb9b83ba24b.exe C:\Users\Admin\AppData\Local\Temp\736c7e43912f503e8c2a91a5f64c95ee3f1f817d20acbb306fba3eb9b83ba24b.exe
PID 2660 wrote to memory of 2668 N/A C:\Users\Admin\AppData\Local\Temp\736c7e43912f503e8c2a91a5f64c95ee3f1f817d20acbb306fba3eb9b83ba24b.exe C:\Users\Admin\AppData\Local\Temp\736c7e43912f503e8c2a91a5f64c95ee3f1f817d20acbb306fba3eb9b83ba24b.exe
PID 2660 wrote to memory of 2668 N/A C:\Users\Admin\AppData\Local\Temp\736c7e43912f503e8c2a91a5f64c95ee3f1f817d20acbb306fba3eb9b83ba24b.exe C:\Users\Admin\AppData\Local\Temp\736c7e43912f503e8c2a91a5f64c95ee3f1f817d20acbb306fba3eb9b83ba24b.exe
PID 2660 wrote to memory of 2668 N/A C:\Users\Admin\AppData\Local\Temp\736c7e43912f503e8c2a91a5f64c95ee3f1f817d20acbb306fba3eb9b83ba24b.exe C:\Users\Admin\AppData\Local\Temp\736c7e43912f503e8c2a91a5f64c95ee3f1f817d20acbb306fba3eb9b83ba24b.exe
PID 2660 wrote to memory of 2668 N/A C:\Users\Admin\AppData\Local\Temp\736c7e43912f503e8c2a91a5f64c95ee3f1f817d20acbb306fba3eb9b83ba24b.exe C:\Users\Admin\AppData\Local\Temp\736c7e43912f503e8c2a91a5f64c95ee3f1f817d20acbb306fba3eb9b83ba24b.exe
PID 2668 wrote to memory of 1864 N/A C:\Users\Admin\AppData\Local\Temp\736c7e43912f503e8c2a91a5f64c95ee3f1f817d20acbb306fba3eb9b83ba24b.exe C:\Windows\SysWOW64\WerFault.exe
PID 2668 wrote to memory of 1864 N/A C:\Users\Admin\AppData\Local\Temp\736c7e43912f503e8c2a91a5f64c95ee3f1f817d20acbb306fba3eb9b83ba24b.exe C:\Windows\SysWOW64\WerFault.exe
PID 2668 wrote to memory of 1864 N/A C:\Users\Admin\AppData\Local\Temp\736c7e43912f503e8c2a91a5f64c95ee3f1f817d20acbb306fba3eb9b83ba24b.exe C:\Windows\SysWOW64\WerFault.exe
PID 2668 wrote to memory of 1864 N/A C:\Users\Admin\AppData\Local\Temp\736c7e43912f503e8c2a91a5f64c95ee3f1f817d20acbb306fba3eb9b83ba24b.exe C:\Windows\SysWOW64\WerFault.exe

Processes

C:\Users\Admin\AppData\Local\Temp\736c7e43912f503e8c2a91a5f64c95ee3f1f817d20acbb306fba3eb9b83ba24b.exe

"C:\Users\Admin\AppData\Local\Temp\736c7e43912f503e8c2a91a5f64c95ee3f1f817d20acbb306fba3eb9b83ba24b.exe"

C:\Users\Admin\AppData\Local\Temp\736c7e43912f503e8c2a91a5f64c95ee3f1f817d20acbb306fba3eb9b83ba24b.exe

"C:\Users\Admin\AppData\Local\Temp\736c7e43912f503e8c2a91a5f64c95ee3f1f817d20acbb306fba3eb9b83ba24b.exe"

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 2668 -s 68

Network

Country Destination Domain Proto
US 8.8.8.8:53 drive.google.com udp
GB 142.250.187.206:443 drive.google.com tcp
US 8.8.8.8:53 c.pki.goog udp
GB 172.217.16.227:80 c.pki.goog tcp
US 8.8.8.8:53 o.pki.goog udp
GB 142.250.187.227:80 o.pki.goog tcp
US 8.8.8.8:53 drive.usercontent.google.com udp
GB 172.217.16.225:443 drive.usercontent.google.com tcp
US 8.8.8.8:53 crl.microsoft.com udp
GB 2.19.117.22:80 crl.microsoft.com tcp

Files

\Users\Admin\AppData\Local\Temp\nstF3C2.tmp\System.dll

MD5 c9473cb90d79a374b2ba6040ca16e45c
SHA1 ab95b54f12796dce57210d65f05124a6ed81234a
SHA256 b80a5cba69d1853ed5979b0ca0352437bf368a5cfb86cb4528edadd410e11352
SHA512 eafe7d5894622bc21f663bca4dd594392ee0f5b29270b6b56b0187093d6a3a103545464ff6398ad32d2cf15dab79b1f133218ba9ba337ddc01330b5ada804d7b

memory/2660-20-0x0000000003580000-0x00000000041AF000-memory.dmp

memory/2660-21-0x0000000077701000-0x0000000077802000-memory.dmp

memory/2660-22-0x0000000077700000-0x00000000778A9000-memory.dmp

memory/2660-23-0x0000000003580000-0x00000000041AF000-memory.dmp

memory/2668-25-0x0000000077700000-0x00000000778A9000-memory.dmp

memory/2668-24-0x0000000000400000-0x0000000001462000-memory.dmp

memory/2668-47-0x0000000000400000-0x0000000001462000-memory.dmp

memory/2668-48-0x0000000000400000-0x0000000001462000-memory.dmp

memory/2668-49-0x0000000000400000-0x0000000001462000-memory.dmp

memory/2668-50-0x0000000000400000-0x0000000001462000-memory.dmp

memory/2668-51-0x0000000000400000-0x0000000001462000-memory.dmp

memory/2668-52-0x0000000000400000-0x0000000001462000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-11-06 14:40

Reported

2024-11-06 14:42

Platform

win10v2004-20241007-en

Max time kernel

95s

Max time network

138s

Command Line

"C:\Users\Admin\AppData\Local\Temp\736c7e43912f503e8c2a91a5f64c95ee3f1f817d20acbb306fba3eb9b83ba24b.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

Suspicious use of NtCreateThreadExHideFromDebugger

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\736c7e43912f503e8c2a91a5f64c95ee3f1f817d20acbb306fba3eb9b83ba24b.exe N/A

Drops file in Program Files directory

Description Indicator Process Target
File opened for modification C:\Program Files (x86)\Common Files\Reoil.mul C:\Users\Admin\AppData\Local\Temp\736c7e43912f503e8c2a91a5f64c95ee3f1f817d20acbb306fba3eb9b83ba24b.exe N/A

Drops file in Windows directory

Description Indicator Process Target
File opened for modification C:\Windows\Belringernes\Dermatophony.ini C:\Users\Admin\AppData\Local\Temp\736c7e43912f503e8c2a91a5f64c95ee3f1f817d20acbb306fba3eb9b83ba24b.exe N/A
File opened for modification C:\Windows\resources\nringsmiddelet.ini C:\Users\Admin\AppData\Local\Temp\736c7e43912f503e8c2a91a5f64c95ee3f1f817d20acbb306fba3eb9b83ba24b.exe N/A
File opened for modification C:\Windows\resources\stenhjsplanternes\fordreves.ini C:\Users\Admin\AppData\Local\Temp\736c7e43912f503e8c2a91a5f64c95ee3f1f817d20acbb306fba3eb9b83ba24b.exe N/A
File opened for modification C:\Windows\Fonts\karrooers.ini C:\Users\Admin\AppData\Local\Temp\736c7e43912f503e8c2a91a5f64c95ee3f1f817d20acbb306fba3eb9b83ba24b.exe N/A
File opened for modification C:\Windows\Fonts\brunsttiderne.tri C:\Users\Admin\AppData\Local\Temp\736c7e43912f503e8c2a91a5f64c95ee3f1f817d20acbb306fba3eb9b83ba24b.exe N/A
File opened for modification C:\Windows\Fonts\Spodium39.int C:\Users\Admin\AppData\Local\Temp\736c7e43912f503e8c2a91a5f64c95ee3f1f817d20acbb306fba3eb9b83ba24b.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\736c7e43912f503e8c2a91a5f64c95ee3f1f817d20acbb306fba3eb9b83ba24b.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\736c7e43912f503e8c2a91a5f64c95ee3f1f817d20acbb306fba3eb9b83ba24b.exe N/A

Suspicious behavior: MapViewOfSection

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\736c7e43912f503e8c2a91a5f64c95ee3f1f817d20acbb306fba3eb9b83ba24b.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\736c7e43912f503e8c2a91a5f64c95ee3f1f817d20acbb306fba3eb9b83ba24b.exe

"C:\Users\Admin\AppData\Local\Temp\736c7e43912f503e8c2a91a5f64c95ee3f1f817d20acbb306fba3eb9b83ba24b.exe"

C:\Users\Admin\AppData\Local\Temp\736c7e43912f503e8c2a91a5f64c95ee3f1f817d20acbb306fba3eb9b83ba24b.exe

"C:\Users\Admin\AppData\Local\Temp\736c7e43912f503e8c2a91a5f64c95ee3f1f817d20acbb306fba3eb9b83ba24b.exe"

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 264 -ip 264

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 264 -s 1484

Network

Country Destination Domain Proto
US 8.8.8.8:53 217.106.137.52.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 drive.google.com udp
GB 142.250.187.206:443 drive.google.com tcp
US 8.8.8.8:53 c.pki.goog udp
GB 142.250.187.227:80 c.pki.goog tcp
US 8.8.8.8:53 o.pki.goog udp
GB 142.250.187.227:80 o.pki.goog tcp
US 8.8.8.8:53 drive.usercontent.google.com udp
GB 172.217.16.225:443 drive.usercontent.google.com tcp
US 8.8.8.8:53 206.187.250.142.in-addr.arpa udp
US 8.8.8.8:53 225.16.217.172.in-addr.arpa udp
US 8.8.8.8:53 58.55.71.13.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 98.117.19.2.in-addr.arpa udp
US 8.8.8.8:53 88.210.23.2.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\nstB612.tmp\System.dll

MD5 c9473cb90d79a374b2ba6040ca16e45c
SHA1 ab95b54f12796dce57210d65f05124a6ed81234a
SHA256 b80a5cba69d1853ed5979b0ca0352437bf368a5cfb86cb4528edadd410e11352
SHA512 eafe7d5894622bc21f663bca4dd594392ee0f5b29270b6b56b0187093d6a3a103545464ff6398ad32d2cf15dab79b1f133218ba9ba337ddc01330b5ada804d7b

memory/852-18-0x0000000003190000-0x0000000003DBF000-memory.dmp

memory/852-19-0x0000000077241000-0x0000000077361000-memory.dmp

memory/852-20-0x0000000010004000-0x0000000010005000-memory.dmp

memory/852-21-0x0000000003190000-0x0000000003DBF000-memory.dmp

memory/264-22-0x0000000000400000-0x0000000001654000-memory.dmp

memory/264-23-0x0000000001660000-0x000000000228F000-memory.dmp

memory/264-24-0x00000000772C8000-0x00000000772C9000-memory.dmp

memory/264-25-0x00000000772E5000-0x00000000772E6000-memory.dmp

memory/264-38-0x0000000001660000-0x000000000228F000-memory.dmp

memory/264-39-0x0000000000400000-0x0000000001654000-memory.dmp

memory/264-40-0x0000000000401000-0x0000000000404000-memory.dmp

memory/264-42-0x0000000077241000-0x0000000077361000-memory.dmp

memory/264-41-0x0000000000400000-0x0000000001654000-memory.dmp

memory/264-43-0x0000000000401000-0x0000000000404000-memory.dmp

memory/264-44-0x0000000000400000-0x0000000001654000-memory.dmp

memory/264-45-0x0000000000400000-0x0000000001654000-memory.dmp

memory/264-46-0x0000000000400000-0x0000000001654000-memory.dmp

memory/264-47-0x0000000000400000-0x0000000001654000-memory.dmp

memory/264-48-0x0000000000400000-0x0000000001654000-memory.dmp

memory/264-49-0x0000000001660000-0x000000000228F000-memory.dmp

memory/264-50-0x0000000000401000-0x0000000000404000-memory.dmp