FormBook | Threat Level: high | Type: Infostealer

Cryptographic Identifiers

SHA256dece042526daa8eabbffdfc46effc6bbf6fbd1dd6c93aaba5bb4bf308c3c6e97
MD5afe3f5ca54cdddef877c63e08f9a9b1f
File Typevbs
Size399.7 KB
First Seen2026-06-10
File NameINVOICE-PAYMENT ADVICE.vbs
TagsFormBook, vbs

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: dece042526daa8eabbffdfc46effc6bbf6fbd1dd6c93aaba5bb4bf308c3c6e97
  • MD5: afe3f5ca54cdddef877c63e08f9a9b1f

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: dece042526daa8ea"
        threat_level = "high"
        first_seen = "2026-06-10"
    condition:
        hash.sha256(0, filesize) == "dece042526daa8eabbffdfc46effc6bbf6fbd1dd6c93aaba5bb4bf308c3c6e97"
}

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 dece042526daa8eabbffdfc46effc6bbf6fbd1dd6c93aaba5bb4bf308c3c6e97 # MD5 afe3f5ca54cdddef877c63e08f9a9b1f
TypeValueNote
sha256 dece042526daa8eabbffdfc46effc6bbf6fbd1dd6c93aaba5bb4bf308c3c6e97 Sample:FormBook
md5 afe3f5ca54cdddef877c63e08f9a9b1f 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