SmokeLoader | Threat Level: high | Type: Loader

Cryptographic Identifiers

SHA25677a2c2761bd439548177a36b6a10d8979c0e41d2cf3c1c98329307cbe5251ab6
MD54a2e5a268b422b207f87ffeeaf83fbf1
File Typeexe
Size212.0 KB
First Seen2026-03-03
File Nameembedded_payload_decrypted.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: 77a2c2761bd439548177a36b6a10d8979c0e41d2cf3c1c98329307cbe5251ab6
  • MD5: 4a2e5a268b422b207f87ffeeaf83fbf1

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: 77a2c2761bd43954"
        threat_level = "high"
        first_seen = "2026-03-03"
    condition:
        hash.sha256(0, filesize) == "77a2c2761bd439548177a36b6a10d8979c0e41d2cf3c1c98329307cbe5251ab6"
}

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 77a2c2761bd439548177a36b6a10d8979c0e41d2cf3c1c98329307cbe5251ab6 # MD5 4a2e5a268b422b207f87ffeeaf83fbf1
TypeValueNote
sha256 77a2c2761bd439548177a36b6a10d8979c0e41d2cf3c1c98329307cbe5251ab6 Sample:SmokeLoader
md5 4a2e5a268b422b207f87ffeeaf83fbf1 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