WannaCry Variant Triggering Massive Multi-Engine Ransomware Signatures


Zero‑Dwell Threat Intelligence Report

A narrative, executive‑ready view into the malware’s behavior, exposure, and reliable defenses.
Generated: 2025-12-04 08:25:07 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
w1vaxs.exe
Type
Win32 Executable MS Visual C++ (generic)
SHA‑1
53a45078691fe479950d7dcf6ce2a5aad24a9d0a
MD5
8a9936d3c76264da5f481a9ef805598f
First Seen
2025-12-01 14:07:47.359307
Last Analysis
2025-12-01 21:28:46.722325
Dwell Time
0 days, 7 hours, 33 minutes

Extended Dwell Time Impact

For 7+ hours, this malware remained undetected — a several-hour window that allowed the adversary to complete initial compromise and begin early-stage persistence establishment.

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
2025-11-11 09:34:24 UTC First VirusTotal submission
2025-12-03 21:11:17 UTC Latest analysis snapshot 22 days, 11 hours, 36 minutes
2025-12-04 08:25:07 UTC Report generation time 22 days, 22 hours, 50 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: 66. Missed: 7. Coverage: 90.4%.

Detected Vendors

  • Xcitium
  • +65 additional vendors (names not provided)

List includes Xcitium plus an additional 65 vendors per the provided summary.

Missed Vendors

  • Acronis
  • CMC
  • Google
  • google_safebrowsing
  • SUPERAntiSpyware
  • TACHYON
  • tehtris

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

This threat shows heavy registry manipulation (40.04% of total behavior), indicating persistent backdoor installation, configuration tampering, or system policy modification attempts. The malware likely establishes persistence mechanisms and modifies security settings to maintain long-term access.

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
Registry 4696 40.04%
System 3684 31.41%
Misc 1515 12.92%
File System 830 7.08%
Process 314 2.68%
Com 240 2.05%
Device 217 1.85%
Threading 136 1.16%
Crypto 32 0.27%
Services 20 0.17%
Network 19 0.16%
Synchronization 11 0.09%
Hooking 8 0.07%
Windows 7 0.06%

MITRE ATT&CK Mapping

  • T1016 – get socket status
  • T1129 – link function at runtime on Windows
  • T1082 – get number of processors
  • T1543.003 – persist via Windows service
  • T1569.002 – persist via Windows service
  • T1543.003 – create service
  • T1569.002 – create service
  • T1543.003 – modify service
  • T1569.002 – modify service
  • T1027.005 – contain obfuscated stackstrings
  • T1543.003 – start service
  • T1083 – get file size

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.aieov.com 13.248.169.48 United States Amazon Technologies Inc.
www.msftncsi.com 23.200.3.73 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
www.msftncsi.com A
5isohu.com A
www.aieov.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 56 udp
3702 1 udp

UDP Packets

Source IP Dest IP Sport Dport Time Proto
192.168.56.11 192.168.56.255 137 137 3.256492853164673 udp
192.168.56.11 224.0.0.252 49563 5355 3.1737849712371826 udp
192.168.56.11 224.0.0.252 54650 5355 3.1755528450012207 udp
192.168.56.11 224.0.0.252 55601 5355 4.343786954879761 udp
192.168.56.11 224.0.0.252 60205 5355 3.1856889724731445 udp
192.168.56.11 224.0.0.252 62798 5355 5.7491748332977295 udp
192.168.56.11 239.255.255.250 62184 3702 3.183156967163086 udp
192.168.56.11 8.8.4.4 50586 53 350.44744396209717 udp
192.168.56.11 8.8.4.4 51628 53 113.04129886627197 udp
192.168.56.11 8.8.4.4 51663 53 174.7755949497223 udp
192.168.56.11 8.8.4.4 51690 53 6.945621967315674 udp
192.168.56.11 8.8.4.4 51880 53 212.0878369808197 udp
192.168.56.11 8.8.4.4 51899 53 5.75629186630249 udp
192.168.56.11 8.8.4.4 52464 53 321.6977479457855 udp
192.168.56.11 8.8.4.4 53480 53 244.69749093055725 udp
192.168.56.11 8.8.4.4 54684 53 292.97895097732544 udp
192.168.56.11 8.8.4.4 54823 53 513.4165449142456 udp
192.168.56.11 8.8.4.4 55183 53 364.8065860271454 udp
192.168.56.11 8.8.4.4 56007 53 527.7759699821472 udp
192.168.56.11 8.8.4.4 56213 53 36.77534604072571 udp
192.168.56.11 8.8.4.4 56473 53 98.650563955307 udp
192.168.56.11 8.8.4.4 56666 53 226.4475269317627 udp
192.168.56.11 8.8.4.4 58090 53 274.73483395576477 udp
192.168.56.11 8.8.4.4 58800 53 336.0877220630646 udp
192.168.56.11 8.8.4.4 58917 53 80.29118394851685 udp
192.168.56.11 8.8.4.4 59770 53 51.47837996482849 udp
192.168.56.11 8.8.4.4 60054 53 259.05699586868286 udp
192.168.56.11 8.8.4.4 60334 53 127.4319179058075 udp
192.168.56.11 8.8.4.4 61467 53 499.0567510128021 udp
192.168.56.11 8.8.4.4 61507 53 145.9318859577179 udp
192.168.56.11 8.8.4.4 62120 53 160.29157400131226 udp
192.168.56.11 8.8.4.4 62329 53 65.86935305595398 udp
192.168.56.11 8.8.4.4 63439 53 22.38502287864685 udp
192.168.56.11 8.8.4.4 63550 53 197.7309648990631 udp
192.168.56.11 8.8.4.4 64563 53 307.33816385269165 udp
192.168.56.11 8.8.8.8 50586 53 349.4480199813843 udp
192.168.56.11 8.8.8.8 51628 53 112.04577803611755 udp
192.168.56.11 8.8.8.8 51663 53 173.78445386886597 udp
192.168.56.11 8.8.8.8 51690 53 7.931670904159546 udp
192.168.56.11 8.8.8.8 51880 53 211.08855295181274 udp
192.168.56.11 8.8.8.8 51899 53 6.745370864868164 udp
192.168.56.11 8.8.8.8 52464 53 320.6988730430603 udp
192.168.56.11 8.8.8.8 53480 53 243.69791102409363 udp
192.168.56.11 8.8.8.8 54684 53 291.9793128967285 udp
192.168.56.11 8.8.8.8 54823 53 512.416750907898 udp
192.168.56.11 8.8.8.8 55183 53 363.8073320388794 udp
192.168.56.11 8.8.8.8 56007 53 526.7770099639893 udp
192.168.56.11 8.8.8.8 56213 53 35.775914907455444 udp
192.168.56.11 8.8.8.8 56473 53 97.65048599243164 udp
192.168.56.11 8.8.8.8 56666 53 225.44800806045532 udp
192.168.56.11 8.8.8.8 58090 53 273.7344808578491 udp
192.168.56.11 8.8.8.8 58800 53 335.10262393951416 udp
192.168.56.11 8.8.8.8 58917 53 79.29172492027283 udp
192.168.56.11 8.8.8.8 59770 53 50.47860598564148 udp
192.168.56.11 8.8.8.8 60054 53 258.05688405036926 udp
192.168.56.11 8.8.8.8 60334 53 126.43665504455566 udp
192.168.56.11 8.8.8.8 61467 53 498.05728697776794 udp
192.168.56.11 8.8.8.8 61507 53 144.94735383987427 udp
192.168.56.11 8.8.8.8 62120 53 159.29779505729675 udp
192.168.56.11 8.8.8.8 62329 53 64.86980986595154 udp
192.168.56.11 8.8.8.8 63439 53 21.385284900665283 udp
192.168.56.11 8.8.8.8 63550 53 196.73194789886475 udp
192.168.56.11 8.8.8.8 64563 53 306.33865094184875 udp

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

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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