FormBook | Threat Level: high | Type: Infostealer

Cryptographic Identifiers

SHA25606840a4bac62abfd410be15bd45ae47a9516682515baa9c981058428815c5fe7
MD529add908fa403a89387ab9636e41b012
File Typeexe
Size1021.5 KB
First Seen2026-06-08
File Name06840a4bac62abfd410be15bd45ae47a9516682515baa9c981058428815c5fe7
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: 06840a4bac62abfd410be15bd45ae47a9516682515baa9c981058428815c5fe7
  • MD5: 29add908fa403a89387ab9636e41b012

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: 06840a4bac62abfd"
        threat_level = "high"
        first_seen = "2026-06-08"
    condition:
        hash.sha256(0, filesize) == "06840a4bac62abfd410be15bd45ae47a9516682515baa9c981058428815c5fe7"
}

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 06840a4bac62abfd410be15bd45ae47a9516682515baa9c981058428815c5fe7 # MD5 29add908fa403a89387ab9636e41b012
TypeValueNote
sha256 06840a4bac62abfd410be15bd45ae47a9516682515baa9c981058428815c5fe7 Sample:FormBook
md5 29add908fa403a89387ab9636e41b012 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