Stealer Family Sample Using Evasion And Obfuscation Methods


Zero‑Dwell Threat Intelligence Report

A narrative, executive‑ready view into the malware’s behavior, exposure, and reliable defenses.
Generated: 2025-11-27 12:54:42 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
fssyg174.exe
Type
Win32 Executable MS Visual C++ (generic)
SHA‑1
18291592b731ac519bd371d25beafb092dc72570
MD5
2e2669a33eace6d3a59a8e45c3324fdf
First Seen
2025-11-25 07:56:58.644300
Last Analysis
2025-11-25 09:02:43.697517
Dwell Time
0 days, 7 hours, 33 minutes

Extended Dwell Time Impact

For 1+ hours, this malware remained undetected — a limited but sufficient window for the adversary to complete initial execution and establish basic system access.

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
2025-09-22 05:14:20 UTC First VirusTotal submission
2025-11-27 06:58:36 UTC Latest analysis snapshot 66 days, 1 hours, 44 minutes
2025-11-27 12:54:42 UTC Report generation time 66 days, 7 hours, 40 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: 57. Missed: 16. Coverage: 78.1%.

Detected Vendors

  • Xcitium
  • +56 additional vendors (names not provided)

List includes Xcitium plus an additional 56 vendors per the provided summary.

Missed Vendors

  • Acronis
  • Antiy-AVL
  • Baidu
  • ClamAV
  • CMC
  • Fortinet
  • google_safebrowsing
  • Jiangmin
  • SentinelOne
  • SUPERAntiSpyware
  • TACHYON
  • tehtris
  • Trapmine
  • Yandex
  • 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

This threat shows heavy registry manipulation (54.81% 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 3171 54.81%
File System 1487 25.70%
System 954 16.49%
Process 67 1.16%
Device 55 0.95%
Network 14 0.24%
Com 13 0.22%
Threading 8 0.14%
Synchronization 6 0.10%
Misc 4 0.07%
Windows 3 0.05%
Services 2 0.03%
Hooking 1 0.02%

MITRE ATT&CK Mapping

  • T1083 – check if file exists
  • T1129 – link function at runtime on Windows
  • T1082 – get disk information
  • T1083 – get common file path
  • T1135 – enumerate network shares
  • T1083 – enumerate files recursively
  • T1547.009 – create shortcut via IShellLink
  • T1129 – link many functions at runtime
  • T1222 – set file attributes
  • T1546.001 – persist via default file association registry key
  • T1033 – get token membership
  • T1105 – download and write a file
  • T1083 – enumerate files on Windows

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 76.223.54.146 United States Amazon.com, Inc.
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
158.94.208.190 United Kingdom LANEDONET
158.94.208.102 United Kingdom LANEDONET

DNS Queries

Request Type
5isohu.com A
www.msftncsi.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
158.94.208.190 United Kingdom LANEDONET
158.94.208.102 United Kingdom LANEDONET

Port Distribution

Port Count Protocols
137 1 udp
138 1 udp
5355 6 udp
53 14 udp
3702 1 udp

UDP Packets

Source IP Dest IP Sport Dport Time Proto
192.168.56.13 192.168.56.255 137 137 8.38053297996521 udp
192.168.56.13 192.168.56.255 138 138 14.380528926849365 udp
192.168.56.13 224.0.0.252 49311 5355 10.325845956802368 udp
192.168.56.13 224.0.0.252 54881 5355 10.900554895401001 udp
192.168.56.13 224.0.0.252 55150 5355 8.33223295211792 udp
192.168.56.13 224.0.0.252 60010 5355 9.783397912979126 udp
192.168.56.13 224.0.0.252 62406 5355 8.343499898910522 udp
192.168.56.13 224.0.0.252 63527 5355 8.698018074035645 udp
192.168.56.13 239.255.255.250 52252 3702 8.354596853256226 udp
192.168.56.13 8.8.4.4 54879 53 11.26809287071228 udp
192.168.56.13 8.8.4.4 57310 53 55.55217003822327 udp
192.168.56.13 8.8.4.4 57415 53 69.91271591186523 udp
192.168.56.13 8.8.4.4 58697 53 12.880850076675415 udp
192.168.56.13 8.8.4.4 58920 53 84.2863118648529 udp
192.168.56.13 8.8.4.4 62493 53 40.9744610786438 udp
192.168.56.13 8.8.4.4 62849 53 26.61465096473694 udp
192.168.56.13 8.8.8.8 54879 53 12.255712032318115 udp
192.168.56.13 8.8.8.8 57310 53 54.55281400680542 udp
192.168.56.13 8.8.8.8 57415 53 68.9118869304657 udp
192.168.56.13 8.8.8.8 58697 53 13.88033390045166 udp
192.168.56.13 8.8.8.8 58920 53 83.29722905158997 udp
192.168.56.13 8.8.8.8 62493 53 39.977782011032104 udp
192.168.56.13 8.8.8.8 62849 53 25.615715980529785 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

12

Registry Set

61

Services Started

0

Services Opened

0

Registry Opened (Top 25)

Key
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\1759191376_RASMANCS
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\1759191376_RASAPI32
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\{4E07D6CE-7235-4313-9950-B75BC1A54E86}
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\{4E07D6CE-7235-4313-9950-B75BC1A54E86}\fe-54-00-20-6c-4a
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\fe-54-00-20-6c-4a
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\1759476329_RASMANCS
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\1759476329_RASAPI32
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\{40180061-2B11-4AA6-8292-0F6322C0C07B}\fe-54-00-0d-d8-e8
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\{40180061-2B11-4AA6-8292-0F6322C0C07B}
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\1760500861_RASAPI32
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\1760500861_RASMANCS
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\fe-54-00-0d-d8-e8
Show all (12 total)

Registry Set (Top 25)

Key Value
HKEY_USERS\S-1-5-21-575823232-3065301323-1442773979-1000\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ProxyEnable 1
HKEY_USERS\S-1-5-21-575823232-3065301323-1442773979-1000\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ProxyServer %HTTP_PROXY%:8080
HKEY_USERS\S-1-5-21-575823232-3065301323-1442773979-1000\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Connections\SavedLegacySettings 46 00 00 00 07 01 00 00 03 00 00 00 14 00 00 00 65 78 74 72 61 63 74 6F 72 2E 70 72 6F 78 79 3A 38 30 38 30 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 D0 5C 01 4D C1 D5 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
\\Registry\Machine\Software\Classes\txtfile\shell\open\command\(Default)
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Connections\SavedLegacySettings
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ProxyEnable 0
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\1759191376_RASAPI32\ConsoleTracingMask 4294901760
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\1759191376_RASAPI32\EnableConsoleTracing 0
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\1759191376_RASAPI32\EnableFileTracing 0
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\1759191376_RASAPI32\FileDirectory %windir%\tracing
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\1759191376_RASAPI32\FileTracingMask 4294901760
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\1759191376_RASAPI32\MaxFileSize 1048576
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\1759191376_RASMANCS\ConsoleTracingMask 4294901760
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\1759191376_RASMANCS\EnableConsoleTracing 0
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\1759191376_RASMANCS\EnableFileTracing 0
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\1759191376_RASMANCS\FileDirectory %windir%\tracing
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\1759191376_RASMANCS\FileTracingMask 4294901760
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\1759191376_RASMANCS\MaxFileSize 1048576
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\AutoDetect 1
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\UNCAsIntranet 0
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Connections\DefaultConnectionSettings
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\fe-54-00-20-6c-4a\WpadDecision 0
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\fe-54-00-20-6c-4a\WpadDecisionReason 1
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\fe-54-00-20-6c-4a\WpadDecisionTime
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\{4E07D6CE-7235-4313-9950-B75BC1A54E86}\WpadDecision 0
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\{4E07D6CE-7235-4313-9950-B75BC1A54E86}\WpadDecisionReason 1
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\{4E07D6CE-7235-4313-9950-B75BC1A54E86}\WpadDecisionTime
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\{4E07D6CE-7235-4313-9950-B75BC1A54E86}\WpadNetworkName 网络 10
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\1759476329_RASAPI32\ConsoleTracingMask 4294901760
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\1759476329_RASAPI32\EnableConsoleTracing 0
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\1759476329_RASAPI32\EnableFileTracing 0
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\1759476329_RASAPI32\FileDirectory %windir%\tracing
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\1759476329_RASAPI32\FileTracingMask 4294901760
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\1759476329_RASAPI32\MaxFileSize 1048576
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\1759476329_RASMANCS\ConsoleTracingMask 4294901760
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\1759476329_RASMANCS\EnableConsoleTracing 0
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\1759476329_RASMANCS\EnableFileTracing 0
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\1759476329_RASMANCS\FileDirectory %windir%\tracing
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\1759476329_RASMANCS\FileTracingMask 4294901760
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\1759476329_RASMANCS\MaxFileSize 1048576
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\WpadLastNetwork {4E07D6CE-7235-4313-9950-B75BC1A54E86}
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\fe-54-00-0d-d8-e8\WpadDecision 0
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\fe-54-00-0d-d8-e8\WpadDecisionReason 1
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\fe-54-00-0d-d8-e8\WpadDecisionTime
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\{40180061-2B11-4AA6-8292-0F6322C0C07B}\WpadDecision 0
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\{40180061-2B11-4AA6-8292-0F6322C0C07B}\WpadDecisionReason 1
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\{40180061-2B11-4AA6-8292-0F6322C0C07B}\WpadDecisionTime
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\{40180061-2B11-4AA6-8292-0F6322C0C07B}\WpadNetworkName 网络 10
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\1760500861_RASAPI32\ConsoleTracingMask 4294901760
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\1760500861_RASAPI32\EnableConsoleTracing 0
Show all (61 total)
Key Value
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\1760500861_RASAPI32\EnableFileTracing 0
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\1760500861_RASAPI32\FileDirectory %windir%\tracing
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\1760500861_RASAPI32\FileTracingMask 4294901760
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\1760500861_RASAPI32\MaxFileSize 1048576
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\1760500861_RASMANCS\ConsoleTracingMask 4294901760
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\1760500861_RASMANCS\EnableConsoleTracing 0
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\1760500861_RASMANCS\EnableFileTracing 0
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\1760500861_RASMANCS\FileDirectory %windir%\tracing
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\1760500861_RASMANCS\FileTracingMask 4294901760
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\1760500861_RASMANCS\MaxFileSize 1048576
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\WpadLastNetwork {40180061-2B11-4AA6-8292-0F6322C0C07B}

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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