FormBook | Threat Level: high | Type: Infostealer

Cryptographic Identifiers

SHA256db1fbc8d5d7ebb9a895f418fe68b3d9d1eda4ea0609cbba82ea617b2f931327e
MD502fe94c7bf16bdc24608d40f5d77a8f3
File Typegz
Size45.9 KB
First Seen2026-05-08
File Name5b33f9a808847aad09ca6015e16b5e1a1815d990.gz
TagsFormBook, gz, Spam-ITA

Malware Family: FormBook

FormBook, MaaS stealer'dır.

TypeInfostealer
Programming LanguageC
Target PlatformWindows
C2 ProtocolHTTP
PurposeForm verisi hırsızlığı
First Seen Year2016
AliasesxLoader

Threat Indicators (IOC)

  • SHA256: db1fbc8d5d7ebb9a895f418fe68b3d9d1eda4ea0609cbba82ea617b2f931327e
  • MD5: 02fe94c7bf16bdc24608d40f5d77a8f3

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: db1fbc8d5d7ebb9a"
        threat_level = "high"
        first_seen = "2026-05-08"
    condition:
        hash.sha256(0, filesize) == "db1fbc8d5d7ebb9a895f418fe68b3d9d1eda4ea0609cbba82ea617b2f931327e"
}

FormBook — Malware Profile

FormBook web form verisi ve credential hırsızı. SmartAssembly paketleyici. İspanyolca LATAM elektrik faturası lür.

Malware Type
Infostealer
Programming Language
C
C2 Protocol
HTTP
Target Systems
Windows
Also Known As (AKA)
xLoader

Technical Details

C dili, Windows API hooking (form grabbing), HTTP POST C2, browser form stealer, keylogger, screenshot, clipboard monitor, process injection (process hollowing)

Attribution / Threat Actor

ABD'de gelistirilmis; satis darknet forumlari uzerinden yapilmis. Dunya genelindeki multuple suc gruplarina hizmet veren MaaS platformu.

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 — FormBook
# SHA256 db1fbc8d5d7ebb9a895f418fe68b3d9d1eda4ea0609cbba82ea617b2f931327e # MD5 02fe94c7bf16bdc24608d40f5d77a8f3
TypeValueNote
sha256 db1fbc8d5d7ebb9a895f418fe68b3d9d1eda4ea0609cbba82ea617b2f931327e Sample:FormBook
md5 02fe94c7bf16bdc24608d40f5d77a8f3 Sample:FormBook

C2 Servers (5 recorded servers for this family)

Address Type Port Protocol Status Country
45.61.136.16 ip 80 HTTP active US
hxxp://freeupgrades.net/s1xt/ domain 80 HTTP inactive US
103.75.160.239 ip 443 HTTPS inactive HK
3.29.19.86 ip — TCP inactive —
form-book.club domain 80 HTTP sinkholed —

C2 addresses are provided only from malware samples manually verified by the KEYDAL team. Commercial use is prohibited.

Tags
formbookinfostealermalwarehighsha256hash-analizi