wannacry | 4056238a615260bca116bd686070addc75a16a4c30ee20e805ffdec5c6df0cbb

General

Target
220720-cdvfqsacd9.dll
Size 5.0MB
Sample240320-l76kjaec37
SHA256 4056238a615260bca116bd686070addc75a16a4c30ee20e805ffdec5c6df0cbb
MD5 54abc6dbc947845d38762f53af7f2b16
SHA1 7376d7444a05dc21177496f10d0194eaedd66771
SHA512 d4237b9685c151998308b306974e2e10cc36be530e5f63fa6ef0b4a08181d7cf501813a4e743436f0123c4100416580d2797e46bca1cdf0ea5ae4dfbd2c169b7
SSDEEP 49152:RnqqMSPbcBVQej/1INRx+TSqTdX1HkQo6SAARdhnv:1qqPoBhz1aRxcSUDk36SAEdhv
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

wannacry discovery ransomware worm

Malware Config

Signatures

Wannacry
WannaCry is a ransomware cryptoworm.
ransomware worm wannacry
Contacts a large (3270) 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
1032	mssecsvr.exe
2484	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

Modifies data under HKEY_USERS 15 IoCs

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

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3584 wrote to memory of 624	3584	rundll32.exe	89
PID 3584 wrote to memory of 624	3584	rundll32.exe	89
PID 3584 wrote to memory of 624	3584	rundll32.exe	89
PID 624 wrote to memory of 1032	624	rundll32.exe	90
PID 624 wrote to memory of 1032	624	rundll32.exe	90
PID 624 wrote to memory of 1032	624	rundll32.exe	90

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\220720-cdvfqsacd9.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:3584
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\220720-cdvfqsacd9.dll,#1
  2⤵
  - Drops file in Windows directory
  - Suspicious use of WriteProcessMemory
  PID:624
- - C:\WINDOWS\mssecsvr.exe
    C:\WINDOWS\mssecsvr.exe
    3⤵
    - Executes dropped EXE
    - Drops file in Windows directory
    PID:1032

C:\WINDOWS\mssecsvr.exe
C:\WINDOWS\mssecsvr.exe -m security
1⤵
- Executes dropped EXE
- Drops file in System32 directory
- Modifies data under HKEY_USERS
PID:2484

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

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

mssecsvr.exe

Path C:\Windows\mssecsvr.exe
Size 1024KB
SHA256 abd2635551f06a4f504ebc39d0a67c2fe23ad74be2e7dd141184ba75b1b9c2d0
MD5 ba0ef8d46f752db201a5b32bf93507f0
SHA1 ea32181726b1138f932217f0d20f771711dd47bb
SHA512 ecd0a2846ff9fd55476a2a26c80c52ebe5d304ae870d2960ad8ae7c65f290af1916ee63fcacfb7fd27d215a28b37b804d164d4817c78ced71992e804a438950c
SSDEEP 12288:e1bLgmluCti62/hMbaIMu7L5NVErCA4z2g6rTcbckPU82900Ve7zw+K+DHeQYSUb:QbLguriLhfdmMSirYbcMNgef0QeQjGj
MD5 SHA1 SHA512 SSDEEP

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