Trojanized Qilin Loader With Packed Win32 Console Payload and Qilin-Class Ransom Traits


Zero‑Dwell Threat Intelligence Report

A narrative, executive‑ready view into the malware’s behavior, exposure, and reliable defenses.
Generated: 2025-11-20 08:38:50 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
r191ffa.exe
Type
Win64 Executable (generic)
SHA‑1
b14850a1d30ed06f475392ddce023986e5d964a5
MD5
170e211a2d101ebc98d6ada523793592
First Seen
2025-11-14 19:53:16.954313
Last Analysis
2025-11-15 20:48:20.164851
Dwell Time
0 days, 7 hours, 33 minutes

Extended Dwell Time Impact

For 1+ days, this malware remained undetected — a brief but concerning window that permitted the adversary to establish initial foothold, perform basic system enumeration, and potentially access immediate system resources.

Comparative Context

Industry studies report a median dwell time closer to 21–24 days. This case is significantly below that median, suggesting relatively quick detection.

Timeline

Time (UTC) Event Elapsed
2025-11-06 17:21:12 UTC First VirusTotal submission
2025-11-19 12:49:27 UTC Latest analysis snapshot 12 days, 19 hours, 28 minutes
2025-11-20 08:38:50 UTC Report generation time 13 days, 15 hours, 17 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: 71. Detected as malicious: 50. Missed: 21. Coverage: 70.4%.

Detected Vendors

  • Xcitium
  • +49 additional vendors (names not provided)

List includes Xcitium plus an additional 49 vendors per the provided summary.

Missed Vendors

  • Acronis
  • Antiy-AVL
  • Baidu
  • ClamAV
  • CMC
  • DrWeb
  • Fortinet
  • Gridinsoft
  • huorong
  • Jiangmin
  • NANO-Antivirus
  • SUPERAntiSpyware
  • TACHYON
  • tehtris
  • 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 (92.58% 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 424 92.58%
Process 19 4.15%
Device 6 1.31%
File System 4 0.87%
Hooking 2 0.44%
Registry 2 0.44%
Misc 1 0.22%

MITRE ATT&CK Mapping

  • T1083 – get file size
  • T1082 – query environment variable
  • T1129 – link function at runtime on Windows
  • T1027.005 – contain obfuscated stackstrings
  • T1083 – enumerate files on Windows
  • T1129 – parse PE header

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 23.200.3.33 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

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
192.168.56.11 192.168.56.255 137 137 3.2579410076141357 udp
192.168.56.11 224.0.0.252 49563 5355 3.2084338665008545 udp
192.168.56.11 224.0.0.252 54650 5355 3.2092580795288086 udp
192.168.56.11 224.0.0.252 55601 5355 4.970875024795532 udp
192.168.56.11 224.0.0.252 60205 5355 3.258575916290283 udp
192.168.56.11 224.0.0.252 62798 5355 5.766730070114136 udp
192.168.56.11 239.255.255.250 62184 3702 3.224766969680786 udp
192.168.56.11 8.8.4.4 51690 53 7.803706884384155 udp
192.168.56.11 8.8.4.4 51899 53 5.842586040496826 udp
192.168.56.11 8.8.8.8 51690 53 8.803874969482422 udp
192.168.56.11 8.8.8.8 51899 53 6.834810018539429 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

1

Registry Set

0

Services Started

0

Services Opened

0

Registry Opened (Top 25)

Key
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Volatile-KeyRoam-EXCLUSIVE
Show all (1 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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