MassLogger | Threat Level: medium | Type: Infostealer

Cryptographic Identifiers

SHA256fc26a33b837e60366f55345e182457f06edb1800c88c241a23973ccb2e1401d8
MD5d5219d81e2000cfc97bf307961aaef71
File Typejs
Size2.2 KB
First Seen2025-08-08
File Name1C25TNT_00000682.js
Tagsjs, MassLogger, TNT

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: fc26a33b837e60366f55345e182457f06edb1800c88c241a23973ccb2e1401d8
  • MD5: d5219d81e2000cfc97bf307961aaef71

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: fc26a33b837e6036"
        threat_level = "medium"
        first_seen = "2025-08-08"
    condition:
        hash.sha256(0, filesize) == "fc26a33b837e60366f55345e182457f06edb1800c88c241a23973ccb2e1401d8"
}

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 fc26a33b837e60366f55345e182457f06edb1800c88c241a23973ccb2e1401d8 # MD5 d5219d81e2000cfc97bf307961aaef71
TypeValueNote
sha256 fc26a33b837e60366f55345e182457f06edb1800c88c241a23973ccb2e1401d8 Sample:MassLogger
md5 d5219d81e2000cfc97bf307961aaef71 Sample:MassLogger
Tags
massloggerinfostealermalwaremediumsha256hash-analizi