wannacry | 9241024468ed24908cb7c02dab8eb22a63eaa6d9c8f4b50609c7a17bb4e43d13

General

Target
9241024468ed24908cb7c02dab8eb22a63eaa6d9c8f4b50609c7a17bb4e43d13.dll
Size 5.0MB
Sample261027-bb6kjsxv5q
SHA256 9241024468ed24908cb7c02dab8eb22a63eaa6d9c8f4b50609c7a17bb4e43d13
MD5 eaac38962465059404da8307a3320d24
SHA1 ebdcb420e86febda4c6e478e1a8e2a20df2c6058
SHA512 4950ea740e41116aa435b99edb7814e5540aaec334f68a1bf41e8c9d90acb849418182e4ecf033cf3e7944a2366cef9076d4eff77ba377824432005a02c08e28
SSDEEP 98304:+DqPoBhz1aRxcSUDk36SAEdhvxWa9PC3R8HSa:+DqPe1Cxcxk3ZAEUadsR8HSa
TLSH
T17F3612037285D165D0181A394C67CAECA6E3FCD5FE2E940B7ED1734F2973A86EA41B12
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 (3349) 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
4116	mssecsvc.exe
3332	mssecsvc.exe
3664	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	mssecsvc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	mssecsvc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rundll32.exe

Modifies data under HKEY_USERS 5 IoCs

description	ioc	Process
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
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

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 1644 wrote to memory of 4940	1644	rundll32.exe	89
PID 4940 wrote to memory of 4116	4940	rundll32.exe	90

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\9241024468ed24908cb7c02dab8eb22a63eaa6d9c8f4b50609c7a17bb4e43d13.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:1644
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\9241024468ed24908cb7c02dab8eb22a63eaa6d9c8f4b50609c7a17bb4e43d13.dll,#1
  2⤵
  - Drops file in Windows directory
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4940
- - 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:4116
  - - C:\WINDOWS\tasksche.exe
      C:\WINDOWS\tasksche.exe /i
      4⤵
      Executes dropped EXE
      PID:3664

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:3332

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 1ab0379352673732b00ddc76d984bb454abfed520b9b7a43579a96e0f84da1e0
MD5 1b56e0519039818181c8a7bd35564ba4
SHA1 4d47785b81362316fea52ff15ad7c9c83c80eb2e
SHA512 7ab1e66a7a23a922950786e748887c8754b8dad943054b05f5a16007f66eafb2eb922a2c39568bdaa7db1492d72e85e6e1d9e9bf3a229161813ab259be0e7d09
SSDEEP 98304:yDqPoBhz1aRxcSUDk36SAEdhvxWa9PC3R8HSa0:yDqPe1Cxcxk3ZAEUadsR8HSa0
TLSH
T1350612037285D165D0181A394C67CAECA6E3FCD5FE2E940B7ED1734F2973A86EA41B12
MD5 SHA1 SHA512 SSDEEP TLSH

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tasksche.exe

Path C:\Windows\tasksche.exe
Size 3.4MB
SHA256 c6abadc8b8ade776185707f5fb0e6384f727727641fd53715aa9cd5f920b0f4e
MD5 a924b067cdb06d6df47fc7b4f2977fbd
SHA1 0d144d4aa23de43e7534f4074a10ee2ee70bcb58
SHA512 9fa9651ff025fa16f386db6d5a719ccbf70e4f77546150b44d05a398a9e1dc034c4eeef602a08a4326f51d6086b0e452202d8b5c0adbdfe218a2ad130190c6d2
SSDEEP 98304:QqPoBhz1aRxcSUDk36SAEdhvxWa9PC3R8HSa2:QqPe1Cxcxk3ZAEUadsR8HSa2
TLSH
T160F512037281D166D0181E390C67CAED65D3FCE5FE1E940B7ED2734F2976A8AEA41B12
MD5 SHA1 SHA512 SSDEEP TLSH