MassLogger | Threat Level: medium | Type: Infostealer

Cryptographic Identifiers

SHA256f91e05ca439cfe5e0e7bc5d552d9157ab449c10cd0680e6cdd1d038a3eba687c
MD542d18d9a8fb5e9859a230bdd92b0bbd0
File Typeexe
Size508.0 KB
First Seen2025-06-10
File Namef91e05ca439cfe5e0e7bc5d552d9157ab449c10cd0680e6cdd1d038a3eba687c
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: f91e05ca439cfe5e0e7bc5d552d9157ab449c10cd0680e6cdd1d038a3eba687c
  • MD5: 42d18d9a8fb5e9859a230bdd92b0bbd0

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: f91e05ca439cfe5e"
        threat_level = "medium"
        first_seen = "2025-06-10"
    condition:
        hash.sha256(0, filesize) == "f91e05ca439cfe5e0e7bc5d552d9157ab449c10cd0680e6cdd1d038a3eba687c"
}

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 f91e05ca439cfe5e0e7bc5d552d9157ab449c10cd0680e6cdd1d038a3eba687c # MD5 42d18d9a8fb5e9859a230bdd92b0bbd0
TypeValueNote
sha256 f91e05ca439cfe5e0e7bc5d552d9157ab449c10cd0680e6cdd1d038a3eba687c Sample:MassLogger
md5 42d18d9a8fb5e9859a230bdd92b0bbd0 Sample:MassLogger
Tags
massloggerinfostealermalwaremediumsha256hash-analizi