GuLoader | Threat Level: medium | Type: Loader

Cryptographic Identifiers

SHA256b137b67d9d570e4c1c8998a7ad2890e1f9c1376658b026fad61d9a79e288e8c1
MD5c52f7c38d5e3dbac52026609bdb6711b
File Typejs
Size295.9 KB
First Seen2025-09-14
File Name2025-09-12-0810.js
TagsAgentTesla, GuLoader, js

Malware Family: GuLoader

GuLoader, bulut downloader'dır.

TypeLoader
Programming LanguageC
Target PlatformWindows
C2 ProtocolHTTPS
PurposePayload indirme
First Seen Year2019
AliasesCloudEyE

Threat Indicators (IOC)

  • SHA256: b137b67d9d570e4c1c8998a7ad2890e1f9c1376658b026fad61d9a79e288e8c1
  • MD5: c52f7c38d5e3dbac52026609bdb6711b

You can verify all hash values of this sample on VirusTotal.

System Cleanup Guide

  1. Disconnect the system from the network — the loader may be downloading more malware
  2. Analyze every downloaded payload
  3. Inspect all network traffic and cut suspicious connections
  4. Run a full antivirus scan
  5. Consider reimaging the system

YARA Rule Hints

rule GuLoader_SHA256 {
    meta:
        description = "GuLoader sample: b137b67d9d570e4c"
        threat_level = "medium"
        first_seen = "2025-09-14"
    condition:
        hash.sha256(0, filesize) == "b137b67d9d570e4c1c8998a7ad2890e1f9c1376658b026fad61d9a79e288e8c1"
}

GuLoader — Malware Profile

GuLoader/CloudEyE NSIS/VB dropper. recibo Ispanyolca makbuz. Çift locale tespiti. Registry silme.

Malware Type
Loader
Programming Language
C
C2 Protocol
HTTPS
Target Systems
Windows
Also Known As (AKA)
CloudEyE

Technical Details

Varyanta gore C/C#/VBS/PS1, anti-analysis (VM/debugger check), persistence (Registry/Task Scheduler/Startup folder), payload decryption ve injection (shellcode/PE), fileless execution teknikleri

Capabilities & Behavior

Payload İndirme
Süreç Enjeksiyonu
Modüler Mimari
Kimlik Bilgisi Hırsızlığı
Yanal Hareket
Kalıcılık
Anti-VM/Sandbox
İkincil Payload Dağıtımı

IOC List (2 indicators)

IOC — GuLoader
# SHA256 b137b67d9d570e4c1c8998a7ad2890e1f9c1376658b026fad61d9a79e288e8c1 # MD5 c52f7c38d5e3dbac52026609bdb6711b
TypeValueNote
sha256 b137b67d9d570e4c1c8998a7ad2890e1f9c1376658b026fad61d9a79e288e8c1 Sample:GuLoader
md5 c52f7c38d5e3dbac52026609bdb6711b Sample:GuLoader

C2 Servers (4 recorded servers for this family)

Address Type Port Protocol Status Country
45.155.37.29 ip 443 HTTPS inactive RU
onedrive-cloud-storage.com domain 443 HTTPS inactive US
179.60.150.11 ip 80 HTTP inactive SE
185.250.151.13 ip 443 HTTPS inactive DE

C2 addresses are provided only from malware samples manually verified by the KEYDAL team. Commercial use is prohibited.

Tags
guloaderloadermalwaremediumsha256hash-analizi