Malware Analysis Report

2025-08-10 19:27

Sample ID 230713-y3mm3sba53
Target 4781b5ca739a280c011844dabab8fb008340ad82efa70486edc34e8de8a10946
SHA256 4781b5ca739a280c011844dabab8fb008340ad82efa70486edc34e8de8a10946
Tags
guloader discovery downloader
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V6

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

4781b5ca739a280c011844dabab8fb008340ad82efa70486edc34e8de8a10946

Threat Level: Known bad

The file 4781b5ca739a280c011844dabab8fb008340ad82efa70486edc34e8de8a10946 was found to be: Known bad.

Malicious Activity Summary

guloader discovery downloader

Guloader,Cloudeye

Loads dropped DLL

Checks QEMU agent file

Checks installed software on the system

Suspicious use of SetThreadContext

Suspicious use of NtSetInformationThreadHideFromDebugger

Drops file in Windows directory

Enumerates physical storage devices

Unsigned PE

Suspicious behavior: MapViewOfSection

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2023-07-13 20:18

Signatures

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2023-07-13 20:18

Reported

2023-07-13 20:21

Platform

win10-20230703-en

Max time kernel

149s

Max time network

153s

Command Line

"C:\Users\Admin\AppData\Local\Temp\4781b5ca739a280c011844dabab8fb008340ad82efa70486edc34e8de8a10946.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\4781b5ca739a280c011844dabab8fb008340ad82efa70486edc34e8de8a10946.exe N/A
File opened (read-only) C:\Program Files\Qemu-ga\qemu-ga.exe C:\Users\Admin\AppData\Local\Temp\4781b5ca739a280c011844dabab8fb008340ad82efa70486edc34e8de8a10946.exe N/A

Checks installed software on the system

discovery

Drops file in Windows directory

Description Indicator Process Target
File opened for modification C:\Windows\Fonts\cardiotrophia\Kommastningerne.gen C:\Users\Admin\AppData\Local\Temp\4781b5ca739a280c011844dabab8fb008340ad82efa70486edc34e8de8a10946.exe N/A

Enumerates physical storage devices

Suspicious behavior: MapViewOfSection

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\4781b5ca739a280c011844dabab8fb008340ad82efa70486edc34e8de8a10946.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\4781b5ca739a280c011844dabab8fb008340ad82efa70486edc34e8de8a10946.exe

"C:\Users\Admin\AppData\Local\Temp\4781b5ca739a280c011844dabab8fb008340ad82efa70486edc34e8de8a10946.exe"

C:\Users\Admin\AppData\Local\Temp\4781b5ca739a280c011844dabab8fb008340ad82efa70486edc34e8de8a10946.exe

"C:\Users\Admin\AppData\Local\Temp\4781b5ca739a280c011844dabab8fb008340ad82efa70486edc34e8de8a10946.exe"

Network

Country Destination Domain Proto
US 8.8.8.8:53 cdn.discordapp.com udp
US 162.159.135.233:443 cdn.discordapp.com tcp
US 8.8.8.8:53 233.135.159.162.in-addr.arpa udp
US 8.8.8.8:53 0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.8.0.8.0.8.0.8.0.ip6.arpa udp
US 8.8.8.8:53 126.21.238.8.in-addr.arpa udp
US 8.8.8.8:53 2.77.109.52.in-addr.arpa udp
US 8.8.8.8:53 38.148.119.40.in-addr.arpa udp
US 8.8.8.8:53 7.173.189.20.in-addr.arpa udp

Files

\Users\Admin\AppData\Local\Temp\nsfD1D8.tmp\System.dll

MD5 a4dd044bcd94e9b3370ccf095b31f896
SHA1 17c78201323ab2095bc53184aa8267c9187d5173
SHA256 2e226715419a5882e2e14278940ee8ef0aa648a3ef7af5b3dc252674111962bc
SHA512 87335a43b9ca13e1300c7c23e702e87c669e2bcf4f6065f0c684fc53165e9c1f091cc4d79a3eca3910f0518d3b647120ac0be1a68eaade2e75eaa64adfc92c5a

memory/3576-125-0x0000000003F70000-0x0000000007185000-memory.dmp

memory/3576-126-0x0000000003F70000-0x0000000007185000-memory.dmp

memory/3576-127-0x00007FFF55EA0000-0x00007FFF5607B000-memory.dmp

memory/3576-128-0x0000000077091000-0x00000000771A4000-memory.dmp

memory/3576-129-0x0000000010000000-0x0000000010006000-memory.dmp

memory/4936-130-0x0000000000400000-0x0000000001783000-memory.dmp

memory/4936-132-0x0000000001790000-0x00000000049A5000-memory.dmp

memory/4936-133-0x0000000000400000-0x0000000001783000-memory.dmp

memory/4936-134-0x0000000001790000-0x00000000049A5000-memory.dmp

memory/4936-135-0x00007FFF55EA0000-0x00007FFF5607B000-memory.dmp

memory/4936-136-0x0000000077116000-0x0000000077117000-memory.dmp

memory/4936-143-0x0000000000400000-0x0000000001783000-memory.dmp

memory/4936-145-0x0000000077091000-0x00000000771A4000-memory.dmp