Malware Analysis Report

2024-10-18 23:08

Sample ID 240710-p42c7aygkl
Target 62548c66d11776c84706553bdd76afd7248d2c3e69b0f47215c0dc307f0dd06a
SHA256 62548c66d11776c84706553bdd76afd7248d2c3e69b0f47215c0dc307f0dd06a
Tags
guloader downloader persistence
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: behavioral5

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral7

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral1

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: behavioral6

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral8

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

62548c66d11776c84706553bdd76afd7248d2c3e69b0f47215c0dc307f0dd06a

Threat Level: Known bad

The file 62548c66d11776c84706553bdd76afd7248d2c3e69b0f47215c0dc307f0dd06a was found to be: Known bad.

Malicious Activity Summary

guloader downloader persistence

Guloader,Cloudeye

Checks QEMU agent file

Loads dropped DLL

Adds Run key to start application

Suspicious use of NtSetInformationThreadHideFromDebugger

Suspicious use of SetThreadContext

Enumerates physical storage devices

Program crash

Unsigned PE

NSIS installer

Suspicious behavior: MapViewOfSection

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-07-10 12:53

Signatures

Unsigned PE

Description Indicator Process Target
N/A N/A N/A N/A
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: behavioral2

Detonation Overview

Submitted

2024-07-10 12:53

Reported

2024-07-10 12:56

Platform

win10v2004-20240709-en

Max time kernel

149s

Max time network

153s

Command Line

"C:\Users\Admin\AppData\Local\Temp\62548c66d11776c84706553bdd76afd7248d2c3e69b0f47215c0dc307f0dd06a.exe"

Signatures

Guloader,Cloudeye

downloader guloader

Checks QEMU agent file

Description Indicator Process Target
File opened (read-only) C:\Program Files\Qemu-ga\qemu-ga.exe C:\Users\Admin\AppData\Local\Temp\62548c66d11776c84706553bdd76afd7248d2c3e69b0f47215c0dc307f0dd06a.exe N/A
File opened (read-only) C:\Program Files\Qemu-ga\qemu-ga.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\caspol.exe N/A

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\USER\S-1-5-21-701583114-2636601053-947405450-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\Erhvervsorganisationer = "C:\\Users\\Admin\\AppData\\Local\\Temp\\Jaggies\\Aserne.exe" C:\Windows\Microsoft.NET\Framework\v2.0.50727\caspol.exe N/A

Suspicious use of NtSetInformationThreadHideFromDebugger

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\62548c66d11776c84706553bdd76afd7248d2c3e69b0f47215c0dc307f0dd06a.exe N/A
N/A N/A C:\Windows\Microsoft.NET\Framework\v2.0.50727\caspol.exe N/A

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 2996 set thread context of 2804 N/A C:\Users\Admin\AppData\Local\Temp\62548c66d11776c84706553bdd76afd7248d2c3e69b0f47215c0dc307f0dd06a.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\caspol.exe

Enumerates physical storage devices

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2996 wrote to memory of 1852 N/A C:\Users\Admin\AppData\Local\Temp\62548c66d11776c84706553bdd76afd7248d2c3e69b0f47215c0dc307f0dd06a.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\caspol.exe
PID 2996 wrote to memory of 1852 N/A C:\Users\Admin\AppData\Local\Temp\62548c66d11776c84706553bdd76afd7248d2c3e69b0f47215c0dc307f0dd06a.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\caspol.exe
PID 2996 wrote to memory of 1852 N/A C:\Users\Admin\AppData\Local\Temp\62548c66d11776c84706553bdd76afd7248d2c3e69b0f47215c0dc307f0dd06a.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\caspol.exe
PID 2996 wrote to memory of 4348 N/A C:\Users\Admin\AppData\Local\Temp\62548c66d11776c84706553bdd76afd7248d2c3e69b0f47215c0dc307f0dd06a.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\caspol.exe
PID 2996 wrote to memory of 4348 N/A C:\Users\Admin\AppData\Local\Temp\62548c66d11776c84706553bdd76afd7248d2c3e69b0f47215c0dc307f0dd06a.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\caspol.exe
PID 2996 wrote to memory of 4348 N/A C:\Users\Admin\AppData\Local\Temp\62548c66d11776c84706553bdd76afd7248d2c3e69b0f47215c0dc307f0dd06a.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\caspol.exe
PID 2996 wrote to memory of 2804 N/A C:\Users\Admin\AppData\Local\Temp\62548c66d11776c84706553bdd76afd7248d2c3e69b0f47215c0dc307f0dd06a.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\caspol.exe
PID 2996 wrote to memory of 2804 N/A C:\Users\Admin\AppData\Local\Temp\62548c66d11776c84706553bdd76afd7248d2c3e69b0f47215c0dc307f0dd06a.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\caspol.exe
PID 2996 wrote to memory of 2804 N/A C:\Users\Admin\AppData\Local\Temp\62548c66d11776c84706553bdd76afd7248d2c3e69b0f47215c0dc307f0dd06a.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\caspol.exe
PID 2996 wrote to memory of 2804 N/A C:\Users\Admin\AppData\Local\Temp\62548c66d11776c84706553bdd76afd7248d2c3e69b0f47215c0dc307f0dd06a.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\caspol.exe

Processes

C:\Users\Admin\AppData\Local\Temp\62548c66d11776c84706553bdd76afd7248d2c3e69b0f47215c0dc307f0dd06a.exe

"C:\Users\Admin\AppData\Local\Temp\62548c66d11776c84706553bdd76afd7248d2c3e69b0f47215c0dc307f0dd06a.exe"

C:\Windows\Microsoft.NET\Framework\v2.0.50727\caspol.exe

"C:\Users\Admin\AppData\Local\Temp\62548c66d11776c84706553bdd76afd7248d2c3e69b0f47215c0dc307f0dd06a.exe"

C:\Windows\Microsoft.NET\Framework\v2.0.50727\caspol.exe

"C:\Users\Admin\AppData\Local\Temp\62548c66d11776c84706553bdd76afd7248d2c3e69b0f47215c0dc307f0dd06a.exe"

C:\Windows\Microsoft.NET\Framework\v2.0.50727\caspol.exe

"C:\Users\Admin\AppData\Local\Temp\62548c66d11776c84706553bdd76afd7248d2c3e69b0f47215c0dc307f0dd06a.exe"

Network

Country Destination Domain Proto
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 136.32.126.40.in-addr.arpa udp
US 8.8.8.8:53 www.dropbox.com udp
GB 162.125.64.18:443 www.dropbox.com tcp
US 8.8.8.8:53 18.64.125.162.in-addr.arpa udp
US 8.8.8.8:53 26.165.165.52.in-addr.arpa udp
US 8.8.8.8:53 56.126.166.20.in-addr.arpa udp
US 8.8.8.8:53 92.12.20.2.in-addr.arpa udp
US 8.8.8.8:53 240.221.184.93.in-addr.arpa udp
US 8.8.8.8:53 23.236.111.52.in-addr.arpa udp
US 8.8.8.8:53 27.173.189.20.in-addr.arpa udp

Files

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

MD5 2ae993a2ffec0c137eb51c8832691bcb
SHA1 98e0b37b7c14890f8a599f35678af5e9435906e1
SHA256 681382f3134de5c6272a49dd13651c8c201b89c247b471191496e7335702fa59
SHA512 2501371eb09c01746119305ba080f3b8c41e64535ff09cee4f51322530366d0bd5322ea5290a466356598027e6cda8ab360caef62dcaf560d630742e2dd9bcd9

memory/2996-14-0x0000000004190000-0x0000000005038000-memory.dmp

memory/2996-15-0x0000000076F21000-0x0000000077041000-memory.dmp

memory/2996-16-0x0000000010004000-0x0000000010005000-memory.dmp

memory/2996-17-0x0000000010000000-0x0000000010006000-memory.dmp

memory/2804-18-0x0000000000A30000-0x00000000018D8000-memory.dmp

memory/2996-19-0x0000000004190000-0x0000000005038000-memory.dmp

memory/2804-21-0x0000000076FA8000-0x0000000076FA9000-memory.dmp

memory/2804-22-0x0000000076F21000-0x0000000077041000-memory.dmp

memory/2804-29-0x0000000000400000-0x000000000062B000-memory.dmp

memory/2804-30-0x0000000000A30000-0x00000000018D8000-memory.dmp

Analysis: behavioral5

Detonation Overview

Submitted

2024-07-10 12:53

Reported

2024-07-10 12:56

Platform

win7-20240704-en

Max time kernel

12s

Max time network

19s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\MonitorPlugin.dll,#1

Signatures

N/A

Processes

C:\Windows\system32\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\MonitorPlugin.dll,#1

Network

N/A

Files

N/A

Analysis: behavioral7

Detonation Overview

Submitted

2024-07-10 12:53

Reported

2024-07-10 12:57

Platform

win7-20240704-en

Max time kernel

119s

Max time network

121s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\Skriveblokkes\libdatrie-1.dll,#1

Signatures

N/A

Processes

C:\Windows\system32\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\Skriveblokkes\libdatrie-1.dll,#1

Network

N/A

Files

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-07-10 12:53

Reported

2024-07-10 12:56

Platform

win7-20240708-en

Max time kernel

143s

Max time network

146s

Command Line

"C:\Users\Admin\AppData\Local\Temp\62548c66d11776c84706553bdd76afd7248d2c3e69b0f47215c0dc307f0dd06a.exe"

Signatures

Guloader,Cloudeye

downloader guloader

Checks QEMU agent file

Description Indicator Process Target
File opened (read-only) C:\Program Files\Qemu-ga\qemu-ga.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\caspol.exe N/A
File opened (read-only) C:\Program Files\Qemu-ga\qemu-ga.exe C:\Users\Admin\AppData\Local\Temp\62548c66d11776c84706553bdd76afd7248d2c3e69b0f47215c0dc307f0dd06a.exe N/A

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\USER\S-1-5-21-1506706701-1246725540-2219210854-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce\Erhvervsorganisationer = "C:\\Users\\Admin\\AppData\\Local\\Temp\\Jaggies\\Aserne.exe" C:\Windows\Microsoft.NET\Framework\v2.0.50727\caspol.exe N/A

Suspicious use of NtSetInformationThreadHideFromDebugger

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\62548c66d11776c84706553bdd76afd7248d2c3e69b0f47215c0dc307f0dd06a.exe N/A
N/A N/A C:\Windows\Microsoft.NET\Framework\v2.0.50727\caspol.exe N/A

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 2480 set thread context of 2696 N/A C:\Users\Admin\AppData\Local\Temp\62548c66d11776c84706553bdd76afd7248d2c3e69b0f47215c0dc307f0dd06a.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\caspol.exe

Enumerates physical storage devices

Suspicious behavior: MapViewOfSection

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\62548c66d11776c84706553bdd76afd7248d2c3e69b0f47215c0dc307f0dd06a.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\62548c66d11776c84706553bdd76afd7248d2c3e69b0f47215c0dc307f0dd06a.exe

"C:\Users\Admin\AppData\Local\Temp\62548c66d11776c84706553bdd76afd7248d2c3e69b0f47215c0dc307f0dd06a.exe"

C:\Windows\Microsoft.NET\Framework\v2.0.50727\caspol.exe

"C:\Users\Admin\AppData\Local\Temp\62548c66d11776c84706553bdd76afd7248d2c3e69b0f47215c0dc307f0dd06a.exe"

Network

Country Destination Domain Proto
US 8.8.8.8:53 www.dropbox.com udp
GB 162.125.64.18:443 www.dropbox.com tcp

Files

\Users\Admin\AppData\Local\Temp\nsy899.tmp\System.dll

MD5 2ae993a2ffec0c137eb51c8832691bcb
SHA1 98e0b37b7c14890f8a599f35678af5e9435906e1
SHA256 681382f3134de5c6272a49dd13651c8c201b89c247b471191496e7335702fa59
SHA512 2501371eb09c01746119305ba080f3b8c41e64535ff09cee4f51322530366d0bd5322ea5290a466356598027e6cda8ab360caef62dcaf560d630742e2dd9bcd9

memory/2480-16-0x0000000004380000-0x0000000005228000-memory.dmp

memory/2480-17-0x0000000077B31000-0x0000000077C32000-memory.dmp

memory/2480-18-0x0000000077B30000-0x0000000077CD9000-memory.dmp

memory/2696-19-0x0000000077B30000-0x0000000077CD9000-memory.dmp

memory/2480-21-0x0000000004380000-0x0000000005228000-memory.dmp

memory/2696-42-0x0000000000400000-0x0000000000615000-memory.dmp

memory/2480-48-0x0000000004380000-0x0000000005228000-memory.dmp

Analysis: behavioral3

Detonation Overview

Submitted

2024-07-10 12:53

Reported

2024-07-10 12:56

Platform

win7-20240705-en

Max time kernel

14s

Max time network

18s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\$PLUGINSDIR\System.dll,#1

Signatures

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 1756 -s 224

Network

N/A

Files

N/A

Analysis: behavioral4

Detonation Overview

Submitted

2024-07-10 12:53

Reported

2024-07-10 12:56

Platform

win10v2004-20240709-en

Max time kernel

93s

Max time network

95s

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

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 4728 wrote to memory of 2220 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 4728 wrote to memory of 2220 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 4728 wrote to memory of 2220 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 404 -p 2220 -ip 2220

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 2220 -s 612

Network

Country Destination Domain Proto
US 8.8.8.8:53 2.159.190.20.in-addr.arpa udp
US 8.8.8.8:53 26.165.165.52.in-addr.arpa udp
US 8.8.8.8:53 56.126.166.20.in-addr.arpa udp
US 8.8.8.8:53 107.12.20.2.in-addr.arpa udp
US 8.8.8.8:53 73.144.22.2.in-addr.arpa udp
US 8.8.8.8:53 81.144.22.2.in-addr.arpa udp
US 8.8.8.8:53 21.236.111.52.in-addr.arpa udp

Files

N/A

Analysis: behavioral6

Detonation Overview

Submitted

2024-07-10 12:53

Reported

2024-07-10 12:56

Platform

win10v2004-20240704-en

Max time kernel

149s

Max time network

157s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\MonitorPlugin.dll,#1

Signatures

N/A

Processes

C:\Windows\system32\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\MonitorPlugin.dll,#1

Network

Country Destination Domain Proto
US 8.8.8.8:53 g.bing.com udp
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 73.159.190.20.in-addr.arpa udp
US 204.79.197.237:443 g.bing.com tcp
US 8.8.8.8:53 237.197.79.204.in-addr.arpa udp
US 8.8.8.8:53 172.214.232.199.in-addr.arpa udp
US 8.8.8.8:53 43.58.199.20.in-addr.arpa udp
US 8.8.8.8:53 103.169.127.40.in-addr.arpa udp
US 8.8.8.8:53 206.23.85.13.in-addr.arpa udp
US 8.8.8.8:53 92.12.20.2.in-addr.arpa udp
US 8.8.8.8:53 81.144.22.2.in-addr.arpa udp
US 8.8.8.8:53 100.58.20.217.in-addr.arpa udp
US 8.8.8.8:53 23.236.111.52.in-addr.arpa udp
US 8.8.8.8:53 211.143.182.52.in-addr.arpa udp

Files

N/A

Analysis: behavioral8

Detonation Overview

Submitted

2024-07-10 12:53

Reported

2024-07-10 12:56

Platform

win10v2004-20240709-en

Max time kernel

95s

Max time network

97s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\Skriveblokkes\libdatrie-1.dll,#1

Signatures

N/A

Processes

C:\Windows\system32\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\Skriveblokkes\libdatrie-1.dll,#1

Network

Country Destination Domain Proto
US 8.8.8.8:53 73.159.190.20.in-addr.arpa udp
US 8.8.8.8:53 26.35.223.20.in-addr.arpa udp
US 8.8.8.8:53 86.23.85.13.in-addr.arpa udp
US 8.8.8.8:53 18.31.95.13.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

Files

memory/5032-0-0x0000000068AC0000-0x0000000068AD1000-memory.dmp