WannaCryptor Payload Built With Legacy Visual Studio Six Toolchain


Zero‑Dwell Threat Intelligence Report

A narrative, executive‑ready view into the malware’s behavior, exposure, and reliable defenses.
Generated: 2025-12-04 08:23:33 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
4ctj9j.exe
Type
Win32 Executable MS Visual C++ (generic)
SHA‑1
6f11cad364d44e5f4c094b0b07f34a854bd17a90
MD5
2d76f641c783c3b895a3870c72982d95
First Seen
2025-12-02 11:33:16.046553
Last Analysis
2025-12-02 18:56:41.632373
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
2025-11-13 20:43:18 UTC First VirusTotal submission
2025-12-03 21:09:34 UTC Latest analysis snapshot 20 days, 0 hours, 26 minutes
2025-12-04 08:23:33 UTC Report generation time 20 days, 11 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: 62. Missed: 11. Coverage: 84.9%.

Detected Vendors

  • Xcitium
  • +61 additional vendors (names not provided)

List includes Xcitium plus an additional 61 vendors per the provided summary.

Missed Vendors

  • Acronis
  • APEX
  • Avira
  • Baidu
  • CMC
  • F-Secure
  • SUPERAntiSpyware
  • tehtris
  • Trapmine
  • 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

The malware’s primary focus is on misc operations (40.00% of total behavior), suggesting specialized functionality targeting this system component.

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
Misc 2 40.00%
System 2 40.00%
Windows 1 20.00%

MITRE ATT&CK Mapping

  • T1010 – find graphical window
  • T1033 – get token membership
  • T1083 – enumerate files recursively
  • T1083 – get file size
  • T1614.001 – identify system language via API
  • T1027 – reference AES constants
  • T1129 – link function at runtime on Windows
  • T1083 – check if file exists
  • T1115 – open clipboard
  • T1614 – get geographical location
  • T1083 – get common file path
  • T1083 – enumerate files on Windows
  • T1027.005 – contain obfuscated stackstrings
  • T1027 – encode data using XOR
  • T1070.006 – timestomp file
  • T1129 – access PEB ldr_data
  • T1027 – encrypt data using AES
  • T1129 – link many functions at runtime
  • T1564.003 – hide graphical window
  • T1027 – encrypt data using RC4 KSA
  • T1071 – The PE file contains an overlay
  • T1071 – Binary file triggered YARA rule
  • T1129 – access PEB ldr_data
  • T1027 – encode data using XOR
  • T1564.003 – hide graphical window
  • T1033 – get token membership
  • T1129 – link function at runtime on Windows
  • T1129 – link many functions at runtime
  • T1083 – get file size
  • T1083 – check if file exists
  • T1614.001 – identify system language via API
  • T1614 – get geographical location
  • T1115 – open clipboard
  • T1083 – get common file path
  • T1083 – enumerate files on Windows
  • T1027 – encrypt data using AES
  • T1027 – reference AES constants
  • T1027 – encrypt data using RC4 KSA
  • T1010 – find graphical window
  • T1057 – The process attempted to detect a running debugger using common APIs
  • T1027.002 – Manalize Local SandBox BTC Addres found
  • T1027.002 – Manalize Local SandBox Find Crypto
  • T1027.002 – Manalize Local SandBox Strings
  • T1027.005 – contain obfuscated stackstrings
  • T1070.006 – timestomp file
  • T1059 – Apparent Internal Usage of CMD.EXE
  • T1083 – The file contains some common ransomware-related keywords.
  • T1027.005 – The file contains some common ransomware-related keywords.
  • T1070.006 – The file contains some common ransomware-related keywords.
  • T1564.003 – The file contains some common ransomware-related keywords.
  • T1027.002 – The file contains some common ransomware-related keywords.
  • T1129 – The file contains some common ransomware-related keywords.
  • T1033 – The file contains some common ransomware-related keywords.
  • T1115 – The file contains some common ransomware-related keywords.
  • T1614 – The file contains some common ransomware-related keywords.
  • T1027 – The file contains some common ransomware-related keywords.
  • T1010 – The file contains some common ransomware-related keywords.
  • T1614.001 – The file contains some common ransomware-related keywords.
  • T1542.003 – May use bcdedit to modify the Windows boot settings
  • T1070.004 – May delete shadow drive data (may be related to ransomware)

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.

Observed IPs

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

DNS Queries

Request Type
5isohu.com A

Contacted IPs

IP Country ASN/Org
224.0.0.252
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 4 udp
53 2 udp

UDP Packets

Source IP Dest IP Sport Dport Time Proto
192.168.56.14 192.168.56.255 137 137 3.080728054046631 udp
192.168.56.14 224.0.0.252 51209 5355 3.0157039165496826 udp
192.168.56.14 224.0.0.252 53401 5355 4.581186056137085 udp
192.168.56.14 224.0.0.252 55094 5355 5.57931113243103 udp
192.168.56.14 224.0.0.252 55848 5355 3.018213987350464 udp
192.168.56.14 8.8.4.4 52815 53 7.311070919036865 udp
192.168.56.14 8.8.8.8 52815 53 8.297325134277344 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

39

Registry Set

14

Services Started

0

Services Opened

0

Registry Opened (Top 25)

Key
HKEY_LOCAL_MACHINE\Software\WOW6432Node\Policies\Microsoft\Windows\Display
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\AppModel\Lookaside\user
HKEY_LOCAL_MACHINE\Software\Microsoft\Ole
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Segment Heap
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\file.exe
HKEY_LOCAL_MACHINE\Software\WOW6432Node\Microsoft\Windows NT\CurrentVersion\AppCompatFlags
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\CPSS\Store
HKEY_LOCAL_MACHINE\Software\WOW6432Node\Microsoft\OLE\Tracing
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\AppModel\Lookaside\machine
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\MUI\UILanguages\en-US
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\CPSS\Edition\DevicePolicy\AllowTelemetry
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\AppCompatFlags\SdbUpdates\ManifestedMergeStubSdbs
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\DeviceAccess
HKEY_LOCAL_MACHINE\Software\WOW6432Node\Microsoft\LanguageOverlay\OverlayPackages\en-US
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\CPSS\DevicePolicy\AllowTelemetry\NULL
HKEY_LOCAL_MACHINE\Software\WOW6432Node\Policies\Microsoft\Windows\Safer\CodeIdentifiers
HKEY_LOCAL_MACHINE\Software\Microsoft\Ole\FeatureDevelopmentProperties
HKEY_LOCAL_MACHINE\Software\WOW6432Node\Microsoft\Windows NT\CurrentVersion\GRE_Initialize
HKEY_LOCAL_MACHINE\Software\WOW6432Node\Microsoft\Windows\CurrentVersion\SideBySide\AssemblyStorageRoots
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\CPSS\Store\AllowTelemetry
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Themes\Personalize
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\CPSS\NULL
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\DllNXOptions
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\AppCompatFlags\Disable8And16BitMitigation
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\AppCompatFlags\SdbUpdates
HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Microsoft\OLEAUT
HKEY_LOCAL_MACHINE\OSDATA\Software\Microsoft\Windows NT\CurrentVersion\AppCompatFlags
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Nls\CustomLocale
\REGISTRY\A\{5f231085-6152-8f25-da05-aadac628079e}\Root
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\CPSS
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\CPSS\DevicePolicy\AllowTelemetry
\REGISTRY\A\{5f231085-6152-8f25-da05-aadac628079e}\Root\InventoryApplicationFile
HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Microsoft\OLE
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Policies\DataCollection
HKEY_LOCAL_MACHINE\Software\Microsoft\Wow64\x86
HKEY_LOCAL_MACHINE\Software\WOW6432Node\Policies\Microsoft\MUI\Settings
HKEY_LOCAL_MACHINE\Software\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Image File Execution Options
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders
Show all (39 total)

Registry Set (Top 25)

Key Value
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\Windows Error Reporting\Debug\StoreLocation %LOCALAPPDATA%\Microsoft\Windows\WER\ReportArchive\AppCrash_Z4IM0L5VUU6Z84PC_e9d78beb389e1dd1d1cc34fe2ada58f6c44c628_0a115649
HKEY_USERS\S-1-5-21-575823232-3065301323-1442773979-1000\Software\Microsoft\SystemCertificates\Root\Certificates\0174E68C97DDF1E0EEEA415EA336A163D2B61AFD\Blob 5C 00 00 00 01 00 00 00 04 00 00 00 00 10 00 00 04 00 00 00 01 00 00 00 10 00 00 00 0D BE 92 DE FF 7D 36 BB 48 C4 A6 B1 15 24 95 38 0F 00 00 00 01 00 00 00 20 00 00 00 53 FE B9 19 2E D4 80 F2 09 12 4A 2C 57 D7 E8 97 7A 2E 9F 39 46 1D BF 21 4D F1 12 CB 16 02 4F A2 14 00 00 00 01 00 00 00 14 00 00 00 78 B8 30 FD 63 AC 7B 89 4A 07 3B ED F6 8A 83 9C C3 52 02 65 19 00 00 00 01 00 00 00 10 00 00 00 B5 74 AF 30 C5 C1 BA 3A 69 A7 10 02 00 82 4D D0 03 00 00 00 01 00 00 00 14 00 00 00 01 74 E6 8C 97 DD F1 E0 EE EA 41 5E A3 36 A1 63 D2 B6 1A FD 20 00 00 00 01 00 00 00 F8 05 00 00 30 82 05 F4 30 82 03 DC A0 03 02 01 02 02 09 00 E0 EA 61 4C 28 56 32 64 30 0D 06 09 2A 86 48 86 F7 0D 01 01 0B 05 00 30 81 8E 31 0B 30 09 06 03 55 04 06 13 02 49 4C 31 0F 30 0D 06 03 55 04 08 0C 06 43 65 6E 74 65 72 31 0C 30 0A 06 03 55 04 07 0C 03 4C 6F 64 31 10 30 0E 06 03 55 04 0A 0C 07 47 6F 50 72 6F 78 79 31 10 30 0E 06 03 55 04 0B 0C 07 47 6F 50 72 6F 78 79 31 1A 30 18 06 03 55 04 03 0C 11 67 6F 70 72 6F 78 79 2E 67 69 74 68 75 62 2E 69 6
HKEY_USERS\S-1-5-21-575823232-3065301323-1442773979-1000\Software\Microsoft\Windows\Windows Error Reporting\Debug\StoreLocation %LOCALAPPDATA%\Microsoft\Windows\WER\ReportArchive\AppCrash_Z4IM0L5VUU6Z84PC_e9d78beb389e1dd1d1cc34fe2ada58f6c44c628_0a115649
\REGISTRY\A\{5f231085-6152-8f25-da05-aadac628079e}\Root\InventoryApplicationFile\PermissionsCheckTestKey
\REGISTRY\A\{5f231085-6152-8f25-da05-aadac628079e}\Root\InventoryApplicationFile\file.exe|3bfeaaf1919d30b
\REGISTRY\A\{5f231085-6152-8f25-da05-aadac628079e}\Root\InventoryApplicationFile\file.exe|3bfeaaf1919d30b\ProgramId 00067e492d768e79731624bcdf2e7615f9180000ffff
\REGISTRY\A\{5f231085-6152-8f25-da05-aadac628079e}\Root\InventoryApplicationFile\file.exe|3bfeaaf1919d30b\FileId 00006f11cad364d44e5f4c094b0b07f34a854bd17a90
\REGISTRY\A\{5f231085-6152-8f25-da05-aadac628079e}\Root\InventoryApplicationFile\file.exe|3bfeaaf1919d30b\LowerCaseLongPath c:\users\user\desktop\file.exe
\REGISTRY\A\{5f231085-6152-8f25-da05-aadac628079e}\Root\InventoryApplicationFile\file.exe|3bfeaaf1919d30b\Name file.exe
\REGISTRY\A\{5f231085-6152-8f25-da05-aadac628079e}\Root\InventoryApplicationFile\file.exe|3bfeaaf1919d30b\BinaryType pe32_i386
\REGISTRY\A\{5f231085-6152-8f25-da05-aadac628079e}\Root\InventoryApplicationFile\file.exe|3bfeaaf1919d30b\LinkDate 07/13/2009 23:19:35
\REGISTRY\A\{5f231085-6152-8f25-da05-aadac628079e}\Root\InventoryApplicationFile\file.exe|3bfeaaf1919d30b\Size 00 D0 03 00 00 00 00 00
\REGISTRY\A\{5f231085-6152-8f25-da05-aadac628079e}\Root\InventoryApplicationFile\file.exe|3bfeaaf1919d30b\Usn E0 A5 BA 0F 00 00 00 00
\REGISTRY\A\{5f231085-6152-8f25-da05-aadac628079e}\Root\InventoryApplicationFile\file.exe|3bfeaaf1919d30b\Language 0

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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