MassLogger | Threat Level: medium | Type: Infostealer

Cryptographic Identifiers

SHA2569397adc88e5e074b8aaecee34b2f73bcc27db019555c624cfd2adcee6c6b7903
MD53a046809495884bbd9e7cb6bbd7e7fc6
File Typeexe
Size936.0 KB
First Seen2026-05-20
File NameSinged_Contract_04022025.exe
Tagsexe, 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: 9397adc88e5e074b8aaecee34b2f73bcc27db019555c624cfd2adcee6c6b7903
  • MD5: 3a046809495884bbd9e7cb6bbd7e7fc6

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: 9397adc88e5e074b"
        threat_level = "medium"
        first_seen = "2026-05-20"
    condition:
        hash.sha256(0, filesize) == "9397adc88e5e074b8aaecee34b2f73bcc27db019555c624cfd2adcee6c6b7903"
}

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 9397adc88e5e074b8aaecee34b2f73bcc27db019555c624cfd2adcee6c6b7903 # MD5 3a046809495884bbd9e7cb6bbd7e7fc6
TypeValueNote
sha256 9397adc88e5e074b8aaecee34b2f73bcc27db019555c624cfd2adcee6c6b7903 Sample:MassLogger
md5 3a046809495884bbd9e7cb6bbd7e7fc6 Sample:MassLogger
Tags
massloggerinfostealermalwaremediumsha256hash-analizi