MassLogger | Threat Level: medium | Type: Infostealer

Cryptographic Identifiers

SHA256004dcf9aaffaca3efa1f6e0019e9205f1344cbef12efd1ed8c17ec3a43ecaee0
MD5e230c1216635c46430ef04a219eb53e8
File Typeexe
Size700.0 KB
First Seen2025-08-13
File NameTEKLİF TALEP KOCAK METALURJI-RFQ_xlsx.exe
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: 004dcf9aaffaca3efa1f6e0019e9205f1344cbef12efd1ed8c17ec3a43ecaee0
  • MD5: e230c1216635c46430ef04a219eb53e8

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: 004dcf9aaffaca3e"
        threat_level = "medium"
        first_seen = "2025-08-13"
    condition:
        hash.sha256(0, filesize) == "004dcf9aaffaca3efa1f6e0019e9205f1344cbef12efd1ed8c17ec3a43ecaee0"
}

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 004dcf9aaffaca3efa1f6e0019e9205f1344cbef12efd1ed8c17ec3a43ecaee0 # MD5 e230c1216635c46430ef04a219eb53e8
TypeValueNote
sha256 004dcf9aaffaca3efa1f6e0019e9205f1344cbef12efd1ed8c17ec3a43ecaee0 Sample:MassLogger
md5 e230c1216635c46430ef04a219eb53e8 Sample:MassLogger
Tags
massloggerinfostealermalwaremediumsha256hash-analizi