wannacry | c042ff85ba7a6894f6aed99da09f2d0cb6a1915f1aebd75fd47e14380db151f7

Analysis

max time kernel
150s
max time network
151s
platform
windows11-21h2_x64
resource
win11-20251231-en
resource tags

arch:x64arch:x86image:win11-20251231-enlocale:en-usos:windows11-21h2-x64system
submitted
06/01/2026, 07:32

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General

Target
c042ff85ba7a6894f6aed99da09f2d0cb6a1915f1aebd75fd47e14380db151f7.dll
Size 5.0MB
Sample260106-jddasaev4a
SHA256 c042ff85ba7a6894f6aed99da09f2d0cb6a1915f1aebd75fd47e14380db151f7
MD5 167c15460347daa218e530d842807b3a
SHA1 89496b4ce5ef305beee6672a93f91f504fd89e0f
SHA512 d083def96ec407ea201974ba26068c492f1d7db42107ac455dd2550ce74d261758304eeddb6b65fac40a813bec64c8a3ef0b5a1e97995e8a59bd2db1295f49a0
SSDEEP 49152:RnNQqMSPbcBVQej/1INRx+TSqTdX1HkQo6SAARdhnv:1WqPoBhz1aRxcSUDk36SAEdhv
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

discovery wannacry ransomware worm

Malware Config

Signatures

Wannacry
WannaCry is a ransomware cryptoworm.
ransomware worm wannacry
Wannacry family
wannacry
Contacts a large (3305) amount of remote hosts 1 TTPs
This may indicate a network scan to discover remotely running services.
discovery

Network Service Discovery
T1046

Executes dropped EXE 2 IoCs

pid	Process
1548	mssecsvr.exe
3624	mssecsvr.exe

Creates a large amount of network flows 1 TTPs
This may indicate a network scan to discover remotely running services.
discovery

Network Service Discovery
T1046

Drops file in Windows directory 2 IoCs

description	ioc	Process
File created	C:\WINDOWS\mssecsvr.exe	rundll32.exe
File created	C:\WINDOWS\tasksche.exe	mssecsvr.exe

System Location Discovery: System Language Discovery 1 TTPs 3 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rundll32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	mssecsvr.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	mssecsvr.exe

Modifies data under HKEY_USERS 5 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\	mssecsvr.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\ProxyBypass = "1"	mssecsvr.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\IntranetName = "1"	mssecsvr.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\UNCAsIntranet = "1"	mssecsvr.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\AutoDetect = "0"	mssecsvr.exe

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 4136 wrote to memory of 2360	4136	rundll32.exe	77
PID 2360 wrote to memory of 1548	2360	rundll32.exe	78

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\c042ff85ba7a6894f6aed99da09f2d0cb6a1915f1aebd75fd47e14380db151f7.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:4136
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\c042ff85ba7a6894f6aed99da09f2d0cb6a1915f1aebd75fd47e14380db151f7.dll,#1
  2⤵
  - Drops file in Windows directory
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2360
- - C:\WINDOWS\mssecsvr.exe
    C:\WINDOWS\mssecsvr.exe
    3⤵
    - Executes dropped EXE
    - Drops file in Windows directory
    - System Location Discovery: System Language Discovery
    PID:1548

C:\WINDOWS\mssecsvr.exe
C:\WINDOWS\mssecsvr.exe -m security
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Modifies data under HKEY_USERS
PID:3624

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Network Service Discovery

T1046

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

mssecsvr.exe

Path C:\Windows\mssecsvr.exe
Size 2.2MB
SHA256 379d7d15f7031bc529fb5dd06cfb4db861036231705a340f3a7ee89cc88ef02f
MD5 2f28fe47a262ab5dd12dded7d5926a93
SHA1 f0e53cec9a92bac70667e30cc3b43cfe3899c03f
SHA512 301ca1adaac5c5e168b01047204cac8315ff425036d7a19c3bd33c87e92a731645b55c22ef16b2c90af1f4ea4cb02c3a3cd05dcf2a6debe9498ab2c57aa89019
SSDEEP 49152:QnNQqMSPbcBVQej/1INRx+TSqTdX1HkQo6SAARdhnvn:QWqPoBhz1aRxcSUDk36SAEdhvn
MD5 SHA1 SHA512 SSDEEP

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