FormBook | Threat Level: high | Type: Infostealer

Cryptographic Identifiers

SHA25633522ec6cd83ae54e6602d1e85de8e01090fe1c134fa33f12f0aaec54dd588b5
MD591af45cc9ec31e71e607223d1f5c5a2c
File Typeexe
Size991.0 KB
First Seen2026-06-26
File NameARIBA_CONTRACT_ADNOC_INVOICE_PDF.bat
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: 33522ec6cd83ae54e6602d1e85de8e01090fe1c134fa33f12f0aaec54dd588b5
  • MD5: 91af45cc9ec31e71e607223d1f5c5a2c

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: 33522ec6cd83ae54"
        threat_level = "high"
        first_seen = "2026-06-26"
    condition:
        hash.sha256(0, filesize) == "33522ec6cd83ae54e6602d1e85de8e01090fe1c134fa33f12f0aaec54dd588b5"
}

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 33522ec6cd83ae54e6602d1e85de8e01090fe1c134fa33f12f0aaec54dd588b5 # MD5 91af45cc9ec31e71e607223d1f5c5a2c
TypeValueNote
sha256 33522ec6cd83ae54e6602d1e85de8e01090fe1c134fa33f12f0aaec54dd588b5 Sample:FormBook
md5 91af45cc9ec31e71e607223d1f5c5a2c 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