SmokeLoader | Threat Level: high | Type: Loader

Cryptographic Identifiers

SHA256f2b41e3f4d71315710a8a9f94b9f1f56be0e6d48634d27efe5045a4276e8cc34
MD502ce49901dea7f64e8944b48eb9d9e04
File Typeexe
Size507.9 KB
First Seen2025-12-07
File Nameautoruns.exe
Tagsexe, Smoke Loader, SmokeLoader

Malware Family: SmokeLoader

SmokeLoader, modüler loader/botnet'tir.

TypeLoader
Programming LanguageC
Target PlatformWindows
C2 ProtocolHTTP
PurposeEk yük indiren botnet
First Seen Year2011
AliasesDofoil

Threat Indicators (IOC)

  • SHA256: f2b41e3f4d71315710a8a9f94b9f1f56be0e6d48634d27efe5045a4276e8cc34
  • MD5: 02ce49901dea7f64e8944b48eb9d9e04

You can verify all hash values of this sample on VirusTotal.

System Cleanup Guide

  1. Disconnect the system from the network — the loader may be downloading more malware
  2. Analyze every downloaded payload
  3. Inspect all network traffic and cut suspicious connections
  4. Run a full antivirus scan
  5. Consider reimaging the system

YARA Rule Hints

rule SmokeLoader_SHA256 {
    meta:
        description = "SmokeLoader sample: f2b41e3f4d713157"
        threat_level = "high"
        first_seen = "2025-12-07"
    condition:
        hash.sha256(0, filesize) == "f2b41e3f4d71315710a8a9f94b9f1f56be0e6d48634d27efe5045a4276e8cc34"
}

SmokeLoader — Malware Profile

SmokeLoader. autoruns.exe Sysinternals version info spoofing. Spaso developer PDB username. stub.pdb loader project artifact.

Malware Type
Loader
Programming Language
C
C2 Protocol
HTTP
Target Systems
Windows
Also Known As (AKA)
Dofoil

Technical Details

SmokeLoader (Dofoil/Smoke Bot) is a modular loader/downloader active since 2011. Primary function: download and execute additional payloads (Emotet, TrickBot, FormBook, Ursnif). Heavy obfuscation: string encryption (RC4+XOR), process injection via APC, code injection. Heaven's Gate technique: switches from 32-bit to 64-bit mode to evade WoW64 hooks. Anti-analysis: CPUID-based VM detection, process listing for analysis tools, timing checks. Uses process hollowing to inject into explorer.exe or svchost.exe. C2 communication: RC4-encrypted HTTP POST requests with bot ID, campaign ID. Sold as pay-per-install (PPI) service on underground forums (~$400/1000 installs). Frequently updated to bypass detection, >100 variants documented.

Attribution / Threat Actor

Unknown (sold on underground forums, multiple operators)

Capabilities & Behavior

Payload İndirme
Süreç Enjeksiyonu
Modüler Mimari
Kimlik Bilgisi Hırsızlığı
Yanal Hareket
Kalıcılık
Anti-VM/Sandbox
İkincil Payload Dağıtımı

IOC List (2 indicators)

IOC — SmokeLoader
# SHA256 f2b41e3f4d71315710a8a9f94b9f1f56be0e6d48634d27efe5045a4276e8cc34 # MD5 02ce49901dea7f64e8944b48eb9d9e04
TypeValueNote
sha256 f2b41e3f4d71315710a8a9f94b9f1f56be0e6d48634d27efe5045a4276e8cc34 Sample:SmokeLoader
md5 02ce49901dea7f64e8944b48eb9d9e04 Sample:SmokeLoader

C2 Servers (5 recorded servers for this family)

Address Type Port Protocol Status Country
80.66.75.36 ip 80 HTTP inactive RU
148.72.171.175 ip 80 HTTP inactive US
91.243.44.247 ip 8888 HTTP inactive RU
185.173.35.16 ip 8080 HTTP inactive RU
torcavpcs1.atitech.com domain 443 TCP inactive —

C2 addresses are provided only from malware samples manually verified by the KEYDAL team. Commercial use is prohibited.

Tags
smokeloaderloadermalwarehighsha256hash-analizi