wannacry | 4fa488a9e838003845b7944a0189ec4a7b74dfad454e4efc2a7b2f6cc50bdb0b

Analysis

max time kernel
150s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20260911-en
resource tags

arch:x64arch:x86image:win10v2004-20260911-enlocale:en-usos:windows10-2004-x64systemwindows
submitted
07/11/2026, 12:48

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General

Target
4fa488a9e838003845b7944a0189ec4a7b74dfad454e4efc2a7b2f6cc50bdb0b.dll
Size 5.0MB
Sample261107-p1ttyayvbz
SHA256 4fa488a9e838003845b7944a0189ec4a7b74dfad454e4efc2a7b2f6cc50bdb0b
MD5 bfe2764e985deee015d1ceff856b8354
SHA1 4956756d249b85cb06534ea364e5ea3b8cb8a737
SHA512 84b8c9d540a328a21152613a16191b2ee8984b7008ed003d6fe9971262a437e3ecab1b435fc087d56619d2d5c3f15aa8065711d03eac1755ff7b9170531de231
SSDEEP 49152:RnxQqMSPbcBVQej/1INRx+TSqTdX1HkQo6SAA:16qPoBhz1aRxcSUDk36SA
TLSH
T10436E115A1E86B64E7F36EB2217B871007797E45889B925E1760A04F0C33F5CDEE2F29
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 (3367) 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
1000	mssecsvr.exe
1460	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 1696 wrote to memory of 2512	1696	rundll32.exe	86
PID 2512 wrote to memory of 1000	2512	rundll32.exe	87

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\4fa488a9e838003845b7944a0189ec4a7b74dfad454e4efc2a7b2f6cc50bdb0b.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:1696
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\4fa488a9e838003845b7944a0189ec4a7b74dfad454e4efc2a7b2f6cc50bdb0b.dll,#1
  2⤵
  - Drops file in Windows directory
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2512
- - 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:1000

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:1460

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 5f879a4f5692e2237578b9028f7deb4a808549e13d831ed755ef048d54cf8fd7
MD5 586b2ba03c00210593e7c939700d1652
SHA1 093fd9dafb3d194852be2b51c628ce09869dc053
SHA512 6b58d08bf9f8c65238ec09bdf3a271dd5cd314c561715e78d9a396d65becf31d70beb5dd0890e50f2d5df9c61549271696bcd48cac3cc0dfa194c5f7e651b127
SSDEEP 49152:QnxQqMSPbcBVQej/1INRx+TSqTdX1HkQo6SAAw:Q6qPoBhz1aRxcSUDk36SAz
TLSH
T1F7B5E115A1E86B64E7F36EB2217B871007797E45889B925E1760A04F0C33F5CDEE2F29
MD5 SHA1 SHA512 SSDEEP TLSH

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