FormBook | Threat Level: high | Type: Infostealer

Cryptographic Identifiers

SHA256f07839c913f17f3f16bddf779ae85b9e598704e094baed193e235fe8887d3696
MD5a0ec54328ff5784721e74e48f5540522
File Typeexe
Size1098.0 KB
First Seen2026-05-08
File Namef07839c913f17f3f16bddf779ae85b9e598704e094baed193e235fe8887d3696
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: f07839c913f17f3f16bddf779ae85b9e598704e094baed193e235fe8887d3696
  • MD5: a0ec54328ff5784721e74e48f5540522

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: f07839c913f17f3f"
        threat_level = "high"
        first_seen = "2026-05-08"
    condition:
        hash.sha256(0, filesize) == "f07839c913f17f3f16bddf779ae85b9e598704e094baed193e235fe8887d3696"
}

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 f07839c913f17f3f16bddf779ae85b9e598704e094baed193e235fe8887d3696 # MD5 a0ec54328ff5784721e74e48f5540522
TypeValueNote
sha256 f07839c913f17f3f16bddf779ae85b9e598704e094baed193e235fe8887d3696 Sample:FormBook
md5 a0ec54328ff5784721e74e48f5540522 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