MassLogger | Threat Level: medium | Type: Infostealer

Cryptographic Identifiers

SHA256b991f83d05ee93506c7296862d67ba6c4671cf1c5958aa317198c7fb2933984f
MD5e1f08a6eb65eafac00251070892cd657
File Typejs
Size1501.1 KB
First Seen2026-03-11
File NameSampleOrderPO6947158.js
Tagsjs, MassLogger

Malware Family: MassLogger

MassLogger, email tabanlı keylogger'dır.

TypeInfostealer
Programming LanguageC#/.NET
Target PlatformWindows
C2 ProtocolSMTP/FTP
PurposeEmail keylogger
First Seen Year2020

Threat Indicators (IOC)

  • SHA256: b991f83d05ee93506c7296862d67ba6c4671cf1c5958aa317198c7fb2933984f
  • MD5: e1f08a6eb65eafac00251070892cd657

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: b991f83d05ee9350"
        threat_level = "medium"
        first_seen = "2026-03-11"
    condition:
        hash.sha256(0, filesize) == "b991f83d05ee93506c7296862d67ba6c4671cf1c5958aa317198c7fb2933984f"
}

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 b991f83d05ee93506c7296862d67ba6c4671cf1c5958aa317198c7fb2933984f # MD5 e1f08a6eb65eafac00251070892cd657
TypeValueNote
sha256 b991f83d05ee93506c7296862d67ba6c4671cf1c5958aa317198c7fb2933984f Sample:MassLogger
md5 e1f08a6eb65eafac00251070892cd657 Sample:MassLogger
Tags
massloggerinfostealermalwaremediumsha256hash-analizi