MassLogger | Threat Level: medium | Type: Infostealer

Cryptographic Identifiers

SHA256bfb97f59074a8599fcfc08eba10c56833c28c462564afb335034aa2c87b4376f
MD53e0fdd83234718e50534f0babee9e622
File Typeexe
Size532.0 KB
First Seen2025-06-09
File NameHalkbank 06092025, belge..exe
Tagsexe, geo, Halkbank, MassLogger, TUR

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: bfb97f59074a8599fcfc08eba10c56833c28c462564afb335034aa2c87b4376f
  • MD5: 3e0fdd83234718e50534f0babee9e622

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: bfb97f59074a8599"
        threat_level = "medium"
        first_seen = "2025-06-09"
    condition:
        hash.sha256(0, filesize) == "bfb97f59074a8599fcfc08eba10c56833c28c462564afb335034aa2c87b4376f"
}

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 bfb97f59074a8599fcfc08eba10c56833c28c462564afb335034aa2c87b4376f # MD5 3e0fdd83234718e50534f0babee9e622
TypeValueNote
sha256 bfb97f59074a8599fcfc08eba10c56833c28c462564afb335034aa2c87b4376f Sample:MassLogger
md5 3e0fdd83234718e50534f0babee9e622 Sample:MassLogger
Tags
massloggerinfostealermalwaremediumsha256hash-analizi