FormBook | Threat Level: high | Type: Infostealer

Cryptographic Identifiers

SHA256679522b9c8a0ae3fda6468c0062360d2504f7cab88d085b7296b5f12421d45f5
MD51593c60dd2b48738b4a3ac539513aeef
File Typeexe
Size961.0 KB
First Seen2026-05-08
File Name679522b9c8a0ae3fda6468c0062360d2504f7cab88d085b7296b5f12421d45f5
Tagsexe, FormBook

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: 679522b9c8a0ae3fda6468c0062360d2504f7cab88d085b7296b5f12421d45f5
  • MD5: 1593c60dd2b48738b4a3ac539513aeef

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: 679522b9c8a0ae3f"
        threat_level = "high"
        first_seen = "2026-05-08"
    condition:
        hash.sha256(0, filesize) == "679522b9c8a0ae3fda6468c0062360d2504f7cab88d085b7296b5f12421d45f5"
}

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 679522b9c8a0ae3fda6468c0062360d2504f7cab88d085b7296b5f12421d45f5 # MD5 1593c60dd2b48738b4a3ac539513aeef
TypeValueNote
sha256 679522b9c8a0ae3fda6468c0062360d2504f7cab88d085b7296b5f12421d45f5 Sample:FormBook
md5 1593c60dd2b48738b4a3ac539513aeef 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