MassLogger | Threat Level: medium | Type: Infostealer

Cryptographic Identifiers

SHA2564691af5573a42882f8a2814929d7da66de7fb1ed87970957a4fbfb9b40da2c89
MD57f5ad3809abbbd28af09e09ba0a7d3df
File Typeexe
Size1056.0 KB
First Seen2025-09-07
File NameSecuriteInfo.com.FileRepMalware.51125577
Tagsexe, 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: 4691af5573a42882f8a2814929d7da66de7fb1ed87970957a4fbfb9b40da2c89
  • MD5: 7f5ad3809abbbd28af09e09ba0a7d3df

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: 4691af5573a42882"
        threat_level = "medium"
        first_seen = "2025-09-07"
    condition:
        hash.sha256(0, filesize) == "4691af5573a42882f8a2814929d7da66de7fb1ed87970957a4fbfb9b40da2c89"
}

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 4691af5573a42882f8a2814929d7da66de7fb1ed87970957a4fbfb9b40da2c89 # MD5 7f5ad3809abbbd28af09e09ba0a7d3df
TypeValueNote
sha256 4691af5573a42882f8a2814929d7da66de7fb1ed87970957a4fbfb9b40da2c89 Sample:MassLogger
md5 7f5ad3809abbbd28af09e09ba0a7d3df Sample:MassLogger
Tags
massloggerinfostealermalwaremediumsha256hash-analizi