MassLogger | Threat Level: medium | Type: Infostealer

Cryptographic Identifiers

SHA256455358c970f202a4fa3fb055dbfa05212d5468f23e7cc2967be6fee33120dd53
MD5d4a00f59009aeabc1ad55fcdd4872980
File Typejs
Size202.8 KB
First Seen2025-06-18
File Nameswift mt103.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: 455358c970f202a4fa3fb055dbfa05212d5468f23e7cc2967be6fee33120dd53
  • MD5: d4a00f59009aeabc1ad55fcdd4872980

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: 455358c970f202a4"
        threat_level = "medium"
        first_seen = "2025-06-18"
    condition:
        hash.sha256(0, filesize) == "455358c970f202a4fa3fb055dbfa05212d5468f23e7cc2967be6fee33120dd53"
}

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 455358c970f202a4fa3fb055dbfa05212d5468f23e7cc2967be6fee33120dd53 # MD5 d4a00f59009aeabc1ad55fcdd4872980
TypeValueNote
sha256 455358c970f202a4fa3fb055dbfa05212d5468f23e7cc2967be6fee33120dd53 Sample:MassLogger
md5 d4a00f59009aeabc1ad55fcdd4872980 Sample:MassLogger
Tags
massloggerinfostealermalwaremediumsha256hash-analizi