MassLogger | Threat Level: medium | Type: Infostealer

Cryptographic Identifiers

SHA25654fcf77b7b6ca66ea4a2719b3209f18409edea8e7e7514cf85dc6bcde0745403
MD509cac9219c88e4b8eab055f89f8103e4
File Typejs
Size4811.8 KB
First Seen2025-07-23
File NameRFQ_Mooring_Chain_Replacement_Xlsx.JS
Tagsjs, 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: 54fcf77b7b6ca66ea4a2719b3209f18409edea8e7e7514cf85dc6bcde0745403
  • MD5: 09cac9219c88e4b8eab055f89f8103e4

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: 54fcf77b7b6ca66e"
        threat_level = "medium"
        first_seen = "2025-07-23"
    condition:
        hash.sha256(0, filesize) == "54fcf77b7b6ca66ea4a2719b3209f18409edea8e7e7514cf85dc6bcde0745403"
}

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 54fcf77b7b6ca66ea4a2719b3209f18409edea8e7e7514cf85dc6bcde0745403 # MD5 09cac9219c88e4b8eab055f89f8103e4
TypeValueNote
sha256 54fcf77b7b6ca66ea4a2719b3209f18409edea8e7e7514cf85dc6bcde0745403 Sample:MassLogger
md5 09cac9219c88e4b8eab055f89f8103e4 Sample:MassLogger
Tags
massloggerinfostealermalwaremediumsha256hash-analizi