MassLogger | Threat Level: medium | Type: Infostealer

Cryptographic Identifiers

SHA256a5bb9c91c3a99564b48eb8d9a9ff1ec5de3084c15224d49bf71c0a7a0eddcd18
MD540852c298ccaa1cdcbc2b48c0f4e3e55
File Typeexe
Size1351.0 KB
First Seen2026-05-28
File Namea5bb9c91c3a99564b48eb8d9a9ff1ec5de3084c15224d49bf71c0a7a0eddcd18
Tagsexe, gitlab-com--Hoangdepzaivcl, MassLogger

Malware Family: MassLogger

MassLogger, email tabanlı keylogger'dır.

TypeInfostealer
Programming LanguageC#/.NET
Target PlatformWindows
C2 ProtocolSMTP/FTP
PurposeEmail keylogger
First Seen Year2020

Threat Indicators (IOC)

  • SHA256: a5bb9c91c3a99564b48eb8d9a9ff1ec5de3084c15224d49bf71c0a7a0eddcd18
  • MD5: 40852c298ccaa1cdcbc2b48c0f4e3e55

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

System Cleanup Guide

  1. Disconnect the system from the network immediately
  2. Yeni bir cihazdan banka hesabı, sosyal medya ve e-posta şifrelerini değiştirin
  3. Move crypto wallets to a new address and abandon the old ones
  4. Start a full scan with up-to-date antivirus
  5. Clear saved browser passwords and enable 2FA
  6. Sign out of all sessions on every affected service

YARA Rule Hints

rule MassLogger_SHA256 {
    meta:
        description = "MassLogger sample: a5bb9c91c3a99564"
        threat_level = "medium"
        first_seen = "2026-05-28"
    condition:
        hash.sha256(0, filesize) == "a5bb9c91c3a99564b48eb8d9a9ff1ec5de3084c15224d49bf71c0a7a0eddcd18"
}

MassLogger — Malware Profile

MassLogger credential stealer. PT2600000043.js Portekiz fatura lurü. CommonJS obfuscation. dispatch configuration data.

Malware Type
Infostealer
Programming Language
C#/.NET
C2 Protocol
SMTP/FTP
Target Systems
Windows

Capabilities & Behavior

Tarayıcı Kimlik Bilgileri
Çerez Hırsızlığı
Kripto Cüzdan Çalma
Sistem Bilgisi
Ekran Görüntüsü
FTP/SSH İstemci Şifreleri
E-posta İstemcisi Çalma
Veri Sızıntısı

IOC List (2 indicators)

IOC — MassLogger
# SHA256 a5bb9c91c3a99564b48eb8d9a9ff1ec5de3084c15224d49bf71c0a7a0eddcd18 # MD5 40852c298ccaa1cdcbc2b48c0f4e3e55
TypeValueNote
sha256 a5bb9c91c3a99564b48eb8d9a9ff1ec5de3084c15224d49bf71c0a7a0eddcd18 Sample:MassLogger
md5 40852c298ccaa1cdcbc2b48c0f4e3e55 Sample:MassLogger
Tags
massloggerinfostealermalwaremediumsha256hash-analizi