wannacry | fcc1eedca940d755736b21b92c3ba7384bbf65c962ef27ab19553b58819331ec

Analysis

max time kernel
150s
max time network
152s
platform
windows11-ltsc_2024_x64
resource
win11ltsc2024-20260911-en
resource tags

arch:x64arch:x86image:win11ltsc2024-20260911-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
27/10/2026, 04:10

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General

Target
fcc1eedca940d755736b21b92c3ba7384bbf65c962ef27ab19553b58819331ec.dll
Size 5.0MB
Sample261027-erch7ays2n
SHA256 fcc1eedca940d755736b21b92c3ba7384bbf65c962ef27ab19553b58819331ec
MD5 8271a1a8b8a57aab64ea5155fcbf45c3
SHA1 a61ad086e8aebcc45e95a535ee4ed122b12df33c
SHA512 5d62ccddc4b0212362dadea0371e7d06e039c2f9e8ab1443daab4c807fd9510f5bb33dcf3df9842f9a76aeb91008e31446cda6393c5c510577d309654fccbe7b
SSDEEP 49152:RnHqMSPbcBVQej/1INRx+TSqTdX1HkQo6SAAR:1HqPoBhz1aRxcSUDk36SAE
TLSH
T17E360215A1E82B64D7F22EF2217B871057763E4589AB925E1760A04F0C33F5CDEE2F29
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery wannacry ransomware worm

Malware Config

Signatures

Family: Wannacry
WannaCry is a ransomware cryptoworm.
ransomware worm wannacry
Contacts a large (3355) 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
4104	mssecsvr.exe
5532	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

Reads the TCP/IP host and domain name from the registry 1 TTPs 4 IoCs

The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.

discovery

System Network Configuration Discovery

T1016

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	mssecsvr.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	mssecsvr.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	mssecsvr.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	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 3704 wrote to memory of 5900	3704	rundll32.exe	89
PID 5900 wrote to memory of 4104	5900	rundll32.exe	90

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\fcc1eedca940d755736b21b92c3ba7384bbf65c962ef27ab19553b58819331ec.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:3704
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\fcc1eedca940d755736b21b92c3ba7384bbf65c962ef27ab19553b58819331ec.dll,#1
  2⤵
  - Drops file in Windows directory
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:5900
- - C:\WINDOWS\mssecsvr.exe
    C:\WINDOWS\mssecsvr.exe
    3⤵
    - Executes dropped EXE
    - Drops file in Windows directory
    - Reads the TCP/IP host and domain name from the registry
    - System Location Discovery: System Language Discovery
    PID:4104

C:\WINDOWS\mssecsvr.exe
C:\WINDOWS\mssecsvr.exe -m security
1⤵
- Executes dropped EXE
- Reads the TCP/IP host and domain name from the registry
- System Location Discovery: System Language Discovery
- Modifies data under HKEY_USERS
PID:5532

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

System Network Configuration Discovery

T1016

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

mssecsvr.exe

Path C:\Windows\mssecsvr.exe
Size 2.2MB
SHA256 cd67c2201534c15a406e2138d8da40352b62f8d61341bf563e18bacf9ff02bc5
MD5 59ec98534e340c35f3ca52b97c6ba952
SHA1 b94f12b14ce0b996f8769da510c982c825f00ac3
SHA512 856e096812bfcdb1e568be3cdf5dfde046293ddb038386be1fd772a7bc2fbcd981bb5c02224cfe6f58fedb301f7fd6d5b1ca1425f1aba55b2adfeefed0b92180
SSDEEP 49152:QnHqMSPbcBVQej/1INRx+TSqTdX1HkQo6SAARe:QHqPoBhz1aRxcSUDk36SAEe
TLSH
T173B50215A1E82B64D7B22EF2217B871057763E45C9AB925E1760A04F0C33F5CDEE2F29
MD5 SHA1 SHA512 SSDEEP TLSH

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