wannacry | 749be61425d402c132c5200eb437456a6e54585d7e255e5f8f212315821536e8

General

Target
749be61425d402c132c5200eb437456a6e54585d7e255e5f8f212315821536e8.dll
Size 5.0MB
Sample261002-ghrb4azbma
SHA256 749be61425d402c132c5200eb437456a6e54585d7e255e5f8f212315821536e8
MD5 9baf8ffbe84fdb05ad355f75d4ac73e4
SHA1 17f794ee43a55634d82be8c3374a230d29f122b7
SHA512 df18847454017e1b49321cde8828fbe78e06890893013c41cdbea9b938411e1c71ff8e117eeaf12d548f843b3be7c37b65354fd057bfa10a8126d1452c8b6872
SSDEEP 49152:SnAQqMSPbcBVYAMEcaEau3R8yAH1plAH:+DqPoB6593R8yAVp2H
TLSH
T1853633A55A1C72BCE0A44770A033093DBBB73C69A3358B2F97D4C7950D533E26EA8B45
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 (3348) 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 3 IoCs

pid	Process
3220	mssecsvc.exe
4040	mssecsvc.exe
4768	tasksche.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\mssecsvc.exe	rundll32.exe
File created	C:\WINDOWS\tasksche.exe	mssecsvc.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	mssecsvc.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	mssecsvc.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	mssecsvc.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	mssecsvc.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	mssecsvc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	mssecsvc.exe

Modifies data under HKEY_USERS 5 IoCs

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

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 5956 wrote to memory of 4288	5956	rundll32.exe	88
PID 4288 wrote to memory of 3220	4288	rundll32.exe	89

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\749be61425d402c132c5200eb437456a6e54585d7e255e5f8f212315821536e8.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:5956
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\749be61425d402c132c5200eb437456a6e54585d7e255e5f8f212315821536e8.dll,#1
  2⤵
  - Drops file in Windows directory
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4288
- - C:\WINDOWS\mssecsvc.exe
    C:\WINDOWS\mssecsvc.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:3220
  - - C:\WINDOWS\tasksche.exe
      C:\WINDOWS\tasksche.exe /i
      4⤵
      Executes dropped EXE
      PID:4768

C:\WINDOWS\mssecsvc.exe
C:\WINDOWS\mssecsvc.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:4040

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Network Service Discovery

2

T1046

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

System Network Configuration Discovery

1

T1016

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

mssecsvc.exe

Path C:\Windows\mssecsvc.exe
Size 3.6MB
SHA256 5cd05cedf97a4cdaa1b5d710fb7f655e41cd5fad374fd4e9fd9c2b711b6eab21
MD5 f45473b15bc34939f0c138c04f00ccf1
SHA1 591eb33fc14102cea80191a53d7ee28798aa88ba
SHA512 66d4258e84e16f656bac31721b3e453345a2b744ae2fac3951ed43a48a8108ff92f2d7a1dd8eca92eed535fcba4af532cce1666e93abe39df258f3c5590c0042
SSDEEP 49152:2nAQqMSPbcBVYAMEcaEau3R8yAH1plAHI:yDqPoB6593R8yAVp2HI
TLSH
T1C20633A45A1C72BCE0A44770A033093DBBB73C69A3358B2F97D4C7950D637E26EA4B45
MD5 SHA1 SHA512 SSDEEP TLSH

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tasksche.exe

Path C:\Windows\tasksche.exe
Size 3.4MB
SHA256 e4b4e06f487e8ecbb15cdb772e6df8f1f48d4047643a53d9a712dce95b6742df
MD5 eefac819bb414070f5672e1724ca7f4c
SHA1 78d59756b53bd6eb4ea662abe92f5b205168ae49
SHA512 40241cfd352db84e3902eb933e82cb1cd77d55c9658f23359b833a4bbc885453a09bd3d4c333fc5f5be8bb95d65ea18dbad864543e1865f7e7c48caa1fa689e0
SSDEEP 24576:nQhfdmMSirYbcMNgef00O6LLuYAMEcpcL7nEaut/8uME7A4kqAH1pNZtA0p+9XES:nQqMSPbcBVYAMEcaEau3R8yAH1plAHj
TLSH
T187F533E09A12337CF2F40FB4A121446E3A8B1AB5F6664B3FD2D542C94C58BEA4FD51D8
MD5 SHA1 SHA512 SSDEEP TLSH