f1333548b1b884a9207caeff3f399f67338d687b


Zero‑Dwell Threat Intelligence Report

A narrative, executive‑ready view into the malware’s behavior, exposure, and reliable defenses.
Generated: 2025-10-10 11:28:52 UTC

Executive Overview — What We’re Dealing With

This specimen has persisted long enough to matter. Human experts classified it as Malware, and the telemetry confirms a capable, evasive Trojan with real impact potential.

File
f1333548b1b884a9207caeff3f399f67338d687b
Type
PE32+ executable (DLL) (GUI) x86-64, for MS Windows
SHA‑1
f1333548b1b884a9207caeff3f399f67338d687b
MD5
0992c58a6f2ce9c9264b28d7155d3b34
First Seen
2025-09-14 13:49:48.285582
Last Analysis
2025-09-15 07:15:27.295953
Dwell Time
0 days, 7 hours, 33 minutes

Extended Dwell Time Impact

For 17+ hours, this malware remained undetected — a half-day window that permitted the adversary to complete initial execution, establish basic persistence, and perform initial system enumeration.

Comparative Context

Industry studies report a median dwell time closer to 21–24 days. This case represents rapid detection and containment within hours rather than days.

Timeline

Time (UTC) Event Elapsed
2025-09-12 11:46:31 UTC First VirusTotal submission
2025-09-19 07:08:05 UTC Latest analysis snapshot 6 days, 19 hours, 21 minutes
2025-10-10 11:28:52 UTC Report generation time 27 days, 23 hours, 42 minutes

Why It Matters

Every additional day of dwell time is not just an abstract number — it is attacker opportunity. Each day equates to more time for lateral movement, stealth persistence, and intelligence gathering.

Global Detection Posture — Who Caught It, Who Missed It

VirusTotal engines: 73. Detected as malicious: 37. Missed: 36. Coverage: 50.7%.

Detected Vendors

  • Xcitium
  • +36 additional vendors (names not provided)

List includes Xcitium plus an additional 36 vendors per the provided summary.

Missed Vendors

  • Acronis
  • ALYac
  • Antiy-AVL
  • Arcabit
  • Baidu
  • BitDefender
  • ClamAV
  • CMC
  • CrowdStrike
  • Cylance
  • Elastic
  • Emsisoft
  • Fortinet
  • google_safebrowsing
  • Gridinsoft
  • huorong
  • Jiangmin
  • K7AntiVirus
  • K7GW
  • Kingsoft
  • Malwarebytes
  • MicroWorld-eScan
  • NANO-Antivirus
  • SentinelOne
  • SUPERAntiSpyware
  • TACHYON
  • tehtris
  • Trapmine
  • VIPRE
  • VirIT
  • ViRobot
  • Webroot
  • Yandex
  • Zillya
  • ZoneAlarm
  • Zoner

Why it matters: if any endpoint relies solely on a missed engine, this malware can operate with zero alerts. Prevention‑first controls close that gap regardless of signature lag.

Behavioral Storyline — How the Malware Operates

Dominant system-level operations (44.12% of behavior) suggest this malware performs deep system reconnaissance, privilege escalation, or core OS manipulation. It’s actively probing system defenses and attempting to gain administrative control.

Behavior Categories (weighted)

Weight values represent the frequency and intensity of malware interactions with specific system components. Higher weights indicate more aggressive targeting of that category. Each operation (registry access, file modification, network connection, etc.) contributes to the category’s total weight, providing a quantitative measure of the malware’s behavioral focus.

Category Weight Percentage
System 120 44.12%
Registry 103 37.87%
Process 22 8.09%
File System 17 6.25%
Synchronization 4 1.47%
Misc 2 0.74%
Windows 2 0.74%
Device 2 0.74%

MITRE ATT&CK Mapping

  • T1129 – link function at runtime on Windows
  • T1129 – link many functions at runtime
  • T1129 – parse PE header
  • T1083 – get file size
  • T1027 – encode data using XOR
  • T1027.005 – contain obfuscated stackstrings
  • T1129 – The process tried to load dynamically one or more functions.
  • T1027 – encode data using XOR
  • T1083 – get file size
  • T1129 – parse PE header
  • T1129 – link function at runtime on Windows
  • T1129 – link many functions at runtime
  • T1027.005 – contain obfuscated stackstrings
  • T1063 – It Tries to detect injection methods
  • T1497 – Checks if the current process is being debugged
  • T1218.011 – Runs a DLL by calling functions
  • T1518.001 – Checks if the current process is being debugged

Following the Trail — Network & DNS Activity

Outbound activity leans on reputable infrastructure (e.g., CDNs, cloud endpoints) to blend in. TLS sessions and
HTTP calls show routine beaconing and IP‑lookup behavior that can masquerade as normal browsing.

Contacted Domains

Domain IP Country ASN/Org
www.msftncsi.com 23.200.3.18 United States Akamai Technologies, Inc.

Observed IPs

IP Country ASN/Org
224.0.0.252
239.255.255.250
8.8.4.4 United States Google LLC
8.8.8.8 United States Google LLC

DNS Queries

Request Type
5isohu.com A
www.msftncsi.com A

Contacted IPs

IP Country ASN/Org
224.0.0.252
239.255.255.250
8.8.4.4 United States Google LLC
8.8.8.8 United States Google LLC

Port Distribution

Port Count Protocols
137 1 udp
5355 5 udp
53 4 udp
3702 1 udp

UDP Packets

Source IP Dest IP Sport Dport Time Proto
192.168.56.13 192.168.56.255 137 137 3.2423360347747803 udp
192.168.56.13 224.0.0.252 49311 5355 5.726377964019775 udp
192.168.56.13 224.0.0.252 55150 5355 3.1708860397338867 udp
192.168.56.13 224.0.0.252 60010 5355 5.182687044143677 udp
192.168.56.13 224.0.0.252 62406 5355 3.1736741065979004 udp
192.168.56.13 224.0.0.252 63527 5355 4.022300958633423 udp
192.168.56.13 239.255.255.250 52252 3702 3.1798601150512695 udp
192.168.56.13 8.8.4.4 54879 53 7.788846015930176 udp
192.168.56.13 8.8.4.4 54881 53 6.991552114486694 udp
192.168.56.13 8.8.8.8 54879 53 8.788838148117065 udp
192.168.56.13 8.8.8.8 54881 53 7.991366147994995 udp

Hunting tip: alert on unknown binaries initiating TLS to IP‑lookup services or unusual CDN endpoints — especially early in execution.

Persistence & Policy — Registry and Services

Registry and service telemetry points to policy awareness and environment reconnaissance rather than noisy persistence. Below is a compact view of the most relevant keys and handles; expand to see the full lists where available.

Registry Opened

40

Registry Set

0

Services Started

0

Services Opened

0

Registry Opened (Top 25)

Key
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\AppModel\Lookaside\machine
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Image File Execution Options
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders
HKEY_LOCAL_MACHINE\System\Setup
HKEY_LOCAL_MACHINE\Software\Microsoft\LanguageOverlay\OverlayPackages\en-US
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Themes\Personalize
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\CTF\
HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\Display
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\LanguagePack\DataStore_V1.0
HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\Safer\CodeIdentifiers
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Segment Heap
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\OLE
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\CTF\Compatibility\rundll32.exe
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Windows
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\OLEAUT
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\cmd.exe
HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\MUI\Settings
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager
HKEY_LOCAL_MACHINE\OSDATA\Software\Microsoft\Windows NT\CurrentVersion\AppCompatFlags
HKEY_LOCAL_MACHINE\Software\Microsoft\Ole\FeatureDevelopmentProperties
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\SideBySide
HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows NT\Rpc
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\AppCompatFlags\SdbUpdates
HKEY_LOCAL_MACHINE\Software\Microsoft\Input
HKEY_LOCAL_MACHINE\Software\Microsoft\Wow64\x86\xtajit
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\OOBE
HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\AppCompatFlags\Layers
HKEY_LOCAL_MACHINE\Software\Microsoft\OLE\Tracing
HKEY_LOCAL_MACHINE\Software\Microsoft\Rpc
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Policies\Microsoft\Cryptography\Configuration
HKEY_LOCAL_MACHINE\Software\Microsoft\Ole
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\GRE_Initialize
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\AppCompatFlags\SdbUpdates\ManifestedMergeStubSdbs
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\LanguagePack\SurrogateFallback
HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\AppModel\Lookaside\user
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\LanguagePack\SurrogateFallback\Segoe UI
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\FontLink\SystemLink
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\AppCompatFlags
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\rundll32.exe
Show all (40 total)

Registry Set (Top 25)

Services Started (Top 15)

Services Opened (Top 15)

What To Do Now — Practical Defense Playbook

  • Contain unknowns: block first‑run binaries by default — signatures catch up, containment works now.
  • EDR controls: alert on keyboard hooks, screen capture APIs, VM/sandbox checks, and command‑shell launches.
  • Registry watch: flag queries/sets under policy paths (e.g., …\FipsAlgorithmPolicy\*).
  • Network rules: inspect outbound TLS to IP‑lookup services and unexpected CDN endpoints.
  • Hunt broadly: sweep endpoints for the indicators above and quarantine positives immediately.

Dwell time equals attacker opportunity. Reducing execution privileges and egress shrinks that window even when vendors disagree.

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