MassLogger | Threat Level: medium | Type: Infostealer

Cryptographic Identifiers

SHA25659aa9c73042d2db3f39670b1a53b207d55b14ea10d0aeb68d7d368b3ab79c58a
MD545e4a6ae8e1db88ae2e028b4b4017a82
File Typeexe
Size937.5 KB
First Seen2025-08-12
File Name59aa9c73042d2db3f39670b1a53b207d55b14ea10d0aeb68d7d368b3ab79c58a
Tagsexe, MassLogger

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: 59aa9c73042d2db3f39670b1a53b207d55b14ea10d0aeb68d7d368b3ab79c58a
  • MD5: 45e4a6ae8e1db88ae2e028b4b4017a82

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: 59aa9c73042d2db3"
        threat_level = "medium"
        first_seen = "2025-08-12"
    condition:
        hash.sha256(0, filesize) == "59aa9c73042d2db3f39670b1a53b207d55b14ea10d0aeb68d7d368b3ab79c58a"
}

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 59aa9c73042d2db3f39670b1a53b207d55b14ea10d0aeb68d7d368b3ab79c58a # MD5 45e4a6ae8e1db88ae2e028b4b4017a82
TypeValueNote
sha256 59aa9c73042d2db3f39670b1a53b207d55b14ea10d0aeb68d7d368b3ab79c58a Sample:MassLogger
md5 45e4a6ae8e1db88ae2e028b4b4017a82 Sample:MassLogger
Tags
massloggerinfostealermalwaremediumsha256hash-analizi