MassLogger | Threat Level: medium | Type: Infostealer

Cryptographic Identifiers

SHA256b664d1be6d6d7a962ed360c9ae54fb18209c2ebd07c98351fd581d09f7401127
MD5a074a351d53f035566270ec67481458c
File Typez
Size625.1 KB
First Seen2025-10-09
File NamePurchase Order.Pdf.z.z
TagsMassLogger, z

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: b664d1be6d6d7a962ed360c9ae54fb18209c2ebd07c98351fd581d09f7401127
  • MD5: a074a351d53f035566270ec67481458c

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: b664d1be6d6d7a96"
        threat_level = "medium"
        first_seen = "2025-10-09"
    condition:
        hash.sha256(0, filesize) == "b664d1be6d6d7a962ed360c9ae54fb18209c2ebd07c98351fd581d09f7401127"
}

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 b664d1be6d6d7a962ed360c9ae54fb18209c2ebd07c98351fd581d09f7401127 # MD5 a074a351d53f035566270ec67481458c
TypeValueNote
sha256 b664d1be6d6d7a962ed360c9ae54fb18209c2ebd07c98351fd581d09f7401127 Sample:MassLogger
md5 a074a351d53f035566270ec67481458c Sample:MassLogger
Tags
massloggerinfostealermalwaremediumsha256hash-analizi