MassLogger | Threat Level: medium | Type: Infostealer

Cryptographic Identifiers

SHA256e3a9bd5fa829972acb178dbe89c30e736a36798aac999be307ebbbb6372b60b1
MD5c50fb7179cb1f4f9c25849d296506198
File Typexlsx
Size2197.4 KB
First Seen2025-07-16
File NameFatura_de_Pagamento_Antecipado_Julho_2025.xlam
TagsCVE-2017-11882, MassLogger, xlam, xlsx

Malware Family: MassLogger

MassLogger, email keylogger'dır.

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

Threat Indicators (IOC)

  • SHA256: e3a9bd5fa829972acb178dbe89c30e736a36798aac999be307ebbbb6372b60b1
  • MD5: c50fb7179cb1f4f9c25849d296506198

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: e3a9bd5fa829972a"
        threat_level = "medium"
        first_seen = "2025-07-16"
    condition:
        hash.sha256(0, filesize) == "e3a9bd5fa829972acb178dbe89c30e736a36798aac999be307ebbbb6372b60b1"
}

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 e3a9bd5fa829972acb178dbe89c30e736a36798aac999be307ebbbb6372b60b1 # MD5 c50fb7179cb1f4f9c25849d296506198
TypeValueNote
sha256 e3a9bd5fa829972acb178dbe89c30e736a36798aac999be307ebbbb6372b60b1 Sample:MassLogger
md5 c50fb7179cb1f4f9c25849d296506198 Sample:MassLogger
Tags
massloggerinfostealermalwaremediumsha256hash-analizi