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Ransomware · Ransomworm · Worm

WannaCry - invoice_greenanimals.pdf.exe

Author
Moise Medici
Updated
15 Feb 2026 · Completed
Difficulty
Medium
Platform
Windows
Family
WannaCryptor
Languages
C++
MITRE
T1047 (Windows Management Instrumentation) T1059.003 (Command and Scripting Interpreter: Windows Command Shell) T1059.005 (Command and Scripting Interpreter: Visual Basic) T1569.002 (System Services: Service Execution) T1543.003 (Create or Modify System Process: Windows Service) T1547.001 (Boot or Logon Autostart Execution: Registry Run Keys / Startup Folder) T1027.007 (Obfuscated Files or Information: Dynamic API Resolution) T1027.009 (Obfuscated Files or Information: Embedded Payloads) T1027.013 (Obfuscated Files or Information: Encrypted/Encoded File) T1036.004 (Masquerading: Masquerade Task or Service) T1036.005 (Masquerading: Match Legitimate Resource Name or Location) T1036.007 (Masquerading: Double File Extension) T1070.004 (Indicator Removal: File Deletion) T1140 (Deobfuscate/Decode Files or Information) T1480 (Execution Guardrails) T1564.001 (Hide Artifacts: Hidden Files and Directories) T1620 (Reflective Code Loading) T1222.001 (File and Directory Permissions Modification: Windows Permissions) T1016 (System Network Configuration Discovery) T1033 (System Owner/User Discovery) T1046 (Network Service Discovery) T1083 (File and Directory Discovery) T1680 (Local Storage Discovery) T1210 (Exploitation of Remote Services) T1570 (Lateral Tool Transfer) T1486 (Data Encrypted for Impact) T1490 (Inhibit System Recovery) T1491.001 (Defacement: Internal Defacement)

mssecsvc.exe

While getting the Windows 7 client exploited, there was curiosity about whether mssecsvc.exe was present in the Windows 7 machine, and it was actually found in C:\Windows as expected. It seems very similar to the original sample, even though the SHA256 hashes are different. However, they both have the same tasksche.exe resource attached, and a lot of similar strings, like:

mssecsvc2.0
Microsoft Security Center (2.0) Service
%s -m security
C:\%s\qeriuwjhrf
tasksche.exe
CloseHandle
CreateFileA
CreateProcessA
http://www.iuqerfsodp9ifjaposdfjhgosurijfaewrwergwea.com


tasksche.exe
icacls . /grant Everyone:F /T /C /Q
attrib +h .
WNcry@2ol7


msg/m_filipino.wnry
msg/m_finnish.wnry~
msg/m_french.wnry

So this is probably where the sample copies to when the Eternalblue exploit is successful and continues the infection on the new machine.