MassLogger | Threat Level: medium | Type: Infostealer

Cryptographic Identifiers

SHA256bf12b757b3d6138e7345e5e9113fc8ab5c35f97991cac6a8273b22036623ae4a
MD54a2b05e5a22d76ce587fc45ca944a7ad
File Typeexe
Size421.6 KB
First Seen2026-01-09
File Namebf12b757b3d6138e7345e5e9113fc8ab5c35f97991cac6a8273b22036623ae4a
Tagsexe, MassLogger, signed

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: bf12b757b3d6138e7345e5e9113fc8ab5c35f97991cac6a8273b22036623ae4a
  • MD5: 4a2b05e5a22d76ce587fc45ca944a7ad

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: bf12b757b3d6138e"
        threat_level = "medium"
        first_seen = "2026-01-09"
    condition:
        hash.sha256(0, filesize) == "bf12b757b3d6138e7345e5e9113fc8ab5c35f97991cac6a8273b22036623ae4a"
}

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 bf12b757b3d6138e7345e5e9113fc8ab5c35f97991cac6a8273b22036623ae4a # MD5 4a2b05e5a22d76ce587fc45ca944a7ad
TypeValueNote
sha256 bf12b757b3d6138e7345e5e9113fc8ab5c35f97991cac6a8273b22036623ae4a Sample:MassLogger
md5 4a2b05e5a22d76ce587fc45ca944a7ad Sample:MassLogger
Tags
massloggerinfostealermalwaremediumsha256hash-analizi