MassLogger | Threat Level: medium | Type: Infostealer

Cryptographic Identifiers

SHA25637aa7d9190359b510684537d0982d8ced5b21792d88a28cc8736fb2358011543
MD5ad7f3a7bf167c4f4654ccc9b760e64e5
File Typejs
Size48.1 KB
First Seen2026-02-17
File Namead7f3a7bf167c4f4654ccc9b760e64e5.js
Tagsjs, 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: 37aa7d9190359b510684537d0982d8ced5b21792d88a28cc8736fb2358011543
  • MD5: ad7f3a7bf167c4f4654ccc9b760e64e5

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: 37aa7d9190359b51"
        threat_level = "medium"
        first_seen = "2026-02-17"
    condition:
        hash.sha256(0, filesize) == "37aa7d9190359b510684537d0982d8ced5b21792d88a28cc8736fb2358011543"
}

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 37aa7d9190359b510684537d0982d8ced5b21792d88a28cc8736fb2358011543 # MD5 ad7f3a7bf167c4f4654ccc9b760e64e5
TypeValueNote
sha256 37aa7d9190359b510684537d0982d8ced5b21792d88a28cc8736fb2358011543 Sample:MassLogger
md5 ad7f3a7bf167c4f4654ccc9b760e64e5 Sample:MassLogger
Tags
massloggerinfostealermalwaremediumsha256hash-analizi