FormBook — Sample SHA256: f91a8ea1 | High Threat Analysis

Cryptographic Identifiers

Malware Family: FormBook

FormBook, MaaS infostealer'dır.

Threat Indicators (IOC)

• SHA256: f91a8ea10c20406a4d4ca6744ddce69f4dc93d49bcee2db6d8d20de0f78e764c
• MD5: b8acbb63253a2d08dc3443da44622fce

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 FormBook_SHA256 {
    meta:
        description = "FormBook sample: f91a8ea10c20406a"
        threat_level = "high"
        first_seen = "2026-06-08"
    condition:
        hash.sha256(0, filesize) == "f91a8ea10c20406a4d4ca6744ddce69f4dc93d49bcee2db6d8d20de0f78e764c"
}