MassLogger | Threat Level: medium | Type: Infostealer

Cryptographic Identifiers

SHA2569feb9be42aa71275e2018333ebffeebb4cf01d07998cbf3b702bae571222fa9b
MD5a0efc27b38eeb3a1d20bc03d4c39abc0
File Typejs
Size2304.1 KB
First Seen2026-05-01
File Namefile31.js
Tagsexe-in-archive, js, MassLogger, spamtrap

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: 9feb9be42aa71275e2018333ebffeebb4cf01d07998cbf3b702bae571222fa9b
  • MD5: a0efc27b38eeb3a1d20bc03d4c39abc0

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: 9feb9be42aa71275"
        threat_level = "medium"
        first_seen = "2026-05-01"
    condition:
        hash.sha256(0, filesize) == "9feb9be42aa71275e2018333ebffeebb4cf01d07998cbf3b702bae571222fa9b"
}

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 9feb9be42aa71275e2018333ebffeebb4cf01d07998cbf3b702bae571222fa9b # MD5 a0efc27b38eeb3a1d20bc03d4c39abc0
TypeValueNote
sha256 9feb9be42aa71275e2018333ebffeebb4cf01d07998cbf3b702bae571222fa9b Sample:MassLogger
md5 a0efc27b38eeb3a1d20bc03d4c39abc0 Sample:MassLogger
Tags
massloggerinfostealermalwaremediumsha256hash-analizi