FormBook | Threat Level: high | Type: Infostealer

Cryptographic Identifiers

SHA2560e44300f6f2d8f1d3907d25a8f99bd6236c540a5a65c5cf7af0d40c68f2d7387
MD54293f53d73f2b4bea4c8ec3ce9871043
File Typevbs
Size2554.9 KB
First Seen2026-06-24
File NameProformaInvoice-5628.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: 0e44300f6f2d8f1d3907d25a8f99bd6236c540a5a65c5cf7af0d40c68f2d7387
  • MD5: 4293f53d73f2b4bea4c8ec3ce9871043

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: 0e44300f6f2d8f1d"
        threat_level = "high"
        first_seen = "2026-06-24"
    condition:
        hash.sha256(0, filesize) == "0e44300f6f2d8f1d3907d25a8f99bd6236c540a5a65c5cf7af0d40c68f2d7387"
}

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 0e44300f6f2d8f1d3907d25a8f99bd6236c540a5a65c5cf7af0d40c68f2d7387 # MD5 4293f53d73f2b4bea4c8ec3ce9871043
TypeValueNote
sha256 0e44300f6f2d8f1d3907d25a8f99bd6236c540a5a65c5cf7af0d40c68f2d7387 Sample:FormBook
md5 4293f53d73f2b4bea4c8ec3ce9871043 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