wannacry | 4fc50923587e70fb3ce84ad1863eda0950fe63761758b1a1c071a73a5817cf00

General

Target

951b218fab52434aa7d4624c03dd3415_JaffaCakes118.dll
Size

5.0MB
MD5

951b218fab52434aa7d4624c03dd3415
SHA1

943fc42d4a118b77f032f7d9b767d64731273cbf
SHA256

4fc50923587e70fb3ce84ad1863eda0950fe63761758b1a1c071a73a5817cf00
SHA512

cb043c62e9ed70900d855cb4e48547833d9aa1f527c6f4a43c120a3d80fd681c61fbe4d5e2ea528ed16751995064e8ee6cd8139cb00f988b1e07e9bd7e0cb56d
SSDEEP

49152:MnnMSPbcBVQej/1INRx+TSqTdX1HkQo6SAARdhnv:snPoBhz1aRxcSUDk36SAEdhv

Score

10^/10

wannacry discovery ransomware worm

Malware Config

Signatures

Wannacry
WannaCry is a ransomware cryptoworm.
ransomware worm wannacry
Contacts a large (2999) 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
4508	mssecsvr.exe
4968	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 System32 directory 4 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\Local\Microsoft\Windows\INetCache\Content.IE5	mssecsvr.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\Local\Microsoft\Windows\INetCache\IE	mssecsvr.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\Local\Microsoft\Windows\INetCookies	mssecsvr.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\Local\Microsoft\Windows\History\History.IE5	mssecsvr.exe

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 15 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows	mssecsvr.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion	mssecsvr.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings	mssecsvr.exe
Set value (str)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\5.0\Cache\Content\CachePrefix	mssecsvr.exe
Set value (str)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\5.0\Cache\Cookies\CachePrefix = "Cookie:"	mssecsvr.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\IntranetName = "1"	mssecsvr.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\P3P\History	mssecsvr.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\P3P	mssecsvr.exe
Set value (str)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\5.0\Cache\History\CachePrefix = "Visited:"	mssecsvr.exe
Key created	\REGISTRY\USER\.DEFAULT\Software	mssecsvr.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft	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\UNCAsIntranet = "1"	mssecsvr.exe
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\AutoDetect = "0"	mssecsvr.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5000 wrote to memory of 3856	5000	rundll32.exe	86
PID 5000 wrote to memory of 3856	5000	rundll32.exe	86
PID 5000 wrote to memory of 3856	5000	rundll32.exe	86
PID 3856 wrote to memory of 4508	3856	rundll32.exe	88
PID 3856 wrote to memory of 4508	3856	rundll32.exe	88
PID 3856 wrote to memory of 4508	3856	rundll32.exe	88

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\951b218fab52434aa7d4624c03dd3415_JaffaCakes118.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:5000
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\951b218fab52434aa7d4624c03dd3415_JaffaCakes118.dll,#1
  2⤵
  - Drops file in Windows directory
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3856
- - C:\WINDOWS\mssecsvr.exe
    C:\WINDOWS\mssecsvr.exe
    3⤵
    - Executes dropped EXE
    - Drops file in Windows directory
    - System Location Discovery: System Language Discovery
    PID:4508

C:\WINDOWS\mssecsvr.exe
C:\WINDOWS\mssecsvr.exe -m security
1⤵
- Executes dropped EXE
- Drops file in System32 directory
- System Location Discovery: System Language Discovery
- Modifies data under HKEY_USERS
PID:4968

Network

MITRE ATT&CK Enterprise v15

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

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Windows\mssecsvr.exe

Filesize
2.2MB

MD5
a11ca79930e3ded335b695ce11d20001

SHA1
6aac974c249165af64968b905b69daee1b06e4cc

SHA256
d8639c0ce899db458ead2edfad6ef44c82b765cc2105c1885c5d8e83de607161

SHA512
1b05745521ede6a58c465670301ecb649740355c56cddada09a130fcf5da281f0dd9aeac40c985b67e3fc8c7ee76773873ad466b175995b3c69f54c119e284b7

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