wannacry | 1a8e48e93b1193d643f584490c63efefc81ee8ba9a958b31264a1ad321f95bea

General

Target
1a8e48e93b1193d643f584490c63efefc81ee8ba9a958b31264a1ad321f95bea.dll
Size 5.0MB
Sample261026-wc8frafw2y
SHA256 1a8e48e93b1193d643f584490c63efefc81ee8ba9a958b31264a1ad321f95bea
MD5 221a6a723ae56e8fcc0505983150e21c
SHA1 5957f7955f204110376d688eee608f9fba2e769e
SHA512 70deeec88fce94ee062e309a5bf9fa30d93854ffcace1907f3ac2c426b0572532f116b811d0cef933eee12e742710df968baf7db58cdedf3160cf81ada664d9a
SSDEEP 24576:SbLgddQhfdmMSirYbcMNgef0wcL7nEaut/8uME7A4kqAH1pNZtA0p+9XEk:SnAQqMSPbcBVBEau3R8yAH1plAH
TLSH
T1B4363351666C61BCD0A94771B073092AFBF73C6E63758B1F8BC087990C53781BEA8B46
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 (3366) 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
4484	mssecsvc.exe
1548	mssecsvc.exe
1236	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\tasksche.exe	mssecsvc.exe
File created	C:\WINDOWS\mssecsvc.exe	rundll32.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
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
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\AutoDetect = "0"	mssecsvc.exe

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 4120 wrote to memory of 4012	4120	rundll32.exe	89
PID 4012 wrote to memory of 4484	4012	rundll32.exe	90

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\1a8e48e93b1193d643f584490c63efefc81ee8ba9a958b31264a1ad321f95bea.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:4120
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\1a8e48e93b1193d643f584490c63efefc81ee8ba9a958b31264a1ad321f95bea.dll,#1
  2⤵
  - Drops file in Windows directory
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4012
- - 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:4484
  - - C:\WINDOWS\tasksche.exe
      C:\WINDOWS\tasksche.exe /i
      4⤵
      Executes dropped EXE
      PID:1236

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:1548

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

Replay Monitor

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Downloads

mssecsvc.exe

Path C:\Windows\mssecsvc.exe
Size 3.6MB
SHA256 e44055ded6a61489efb3fe0480f6e3eaedd9effe211f7d309ced6be6c2f99db0
MD5 09446456f5cb09fe8bf3e60cbbeb162d
SHA1 9593abf752d03ad06b062add55c15dbd4bb2b890
SHA512 277eb91fb908e698efaa002ac8dd49f48d5303f206b163f39bc08d9eb695da8e3455dad9db6451254b61afca25560f43e192a115bb2414c7d9432647c98c1261
SSDEEP 24576:2bLgddQhfdmMSirYbcMNgef0wcL7nEaut/8uME7A4kqAH1pNZtA0p+9XEkI:2nAQqMSPbcBVBEau3R8yAH1plAHI
TLSH
T174063341656C61BCE0A94771B073092AFBF73C6E63758B1F87C4879A0C53781BEA8B46
MD5 SHA1 SHA512 SSDEEP TLSH

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tasksche.exe

Path C:\Windows\tasksche.exe
Size 3.4MB
SHA256 ab6584d4715ec5274c81507bbdf0792941005b18b851b387937050020844ca35
MD5 17e664dba10b91fa3bfa8a6f6ee4838b
SHA1 7cb4207fdff15ee9de434ba2db89f2e0e8beae02
SHA512 781949fff69bb70a463b2b271504e2e485ea1b122308ba6502a5cc8397d66ab748cf655aaf08d68febe9276535b68f7d2c2bf334b1b7c90af54f0c4a8d561941
SSDEEP 24576:nQhfdmMSirYbcMNgef0wcL7nEaut/8uME7A4kqAH1pNZtA0p+9XEkj:nQqMSPbcBVBEau3R8yAH1plAHj
TLSH
T1EBF533D09521337CF2F54FB5702644AB3AD70ABAF2A64B7AD5C503C9CC08B958F994C9
MD5 SHA1 SHA512 SSDEEP TLSH