wannacry | a903d75b894efefc834cff35afc6d429fa3929a2ef8b801889a906cb3d210139

Analysis

max time kernel
150s
max time network
150s
platform
windows7_x64
resource
win7-20240729-en
resource tags

arch:x64arch:x86image:win7-20240729-enlocale:en-usos:windows7-x64system
submitted
15-09-2024 00:40

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General

Target

a903d75b894efefc834cff35afc6d429fa3929a2ef8b801889a906cb3d210139.dll
Size

5.0MB
MD5

43295328bbda9562e1f06bf87f75c0e3
SHA1

93f34f8dcdf8029f71bc2882055fbd8e9355abe7
SHA256

a903d75b894efefc834cff35afc6d429fa3929a2ef8b801889a906cb3d210139
SHA512

9f61e5403b0b05bcd7d615fb0fc0d56c1c28df464e2babf814878d862c973ff5be70cb6f853c27a837e3974f7be9589b570285adbf245046f3407608e70b64e7
SSDEEP

24576:RbLgdeQhfVZMSirYbcMNgef0QeQjG/D8kIqRYoAdNLKz6627X6SASk+RdhAdmv:RnjQ1MSPbcBVQej/1INRp6SAARdhnv

Score

10^/10

wannacry discovery ransomware worm

Malware Config

Signatures

Wannacry
WannaCry is a ransomware cryptoworm.
ransomware worm wannacry
Contacts a large (3282) 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
1960	mssecsvr.exe
1440	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 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\Local\Microsoft\Windows\Temporary Internet Files\counters.dat	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 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings	mssecsvr.exe

Suspicious use of WriteProcessMemory 11 IoCs

description	pid	Process	procid_target
PID 1744 wrote to memory of 1880	1744	rundll32.exe	31
PID 1744 wrote to memory of 1880	1744	rundll32.exe	31
PID 1744 wrote to memory of 1880	1744	rundll32.exe	31
PID 1744 wrote to memory of 1880	1744	rundll32.exe	31
PID 1744 wrote to memory of 1880	1744	rundll32.exe	31
PID 1744 wrote to memory of 1880	1744	rundll32.exe	31
PID 1744 wrote to memory of 1880	1744	rundll32.exe	31
PID 1880 wrote to memory of 1960	1880	rundll32.exe	32
PID 1880 wrote to memory of 1960	1880	rundll32.exe	32
PID 1880 wrote to memory of 1960	1880	rundll32.exe	32
PID 1880 wrote to memory of 1960	1880	rundll32.exe	32

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\a903d75b894efefc834cff35afc6d429fa3929a2ef8b801889a906cb3d210139.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:1744
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\a903d75b894efefc834cff35afc6d429fa3929a2ef8b801889a906cb3d210139.dll,#1
  2⤵
  - Drops file in Windows directory
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1880
- - C:\WINDOWS\mssecsvr.exe
    C:\WINDOWS\mssecsvr.exe
    3⤵
    - Executes dropped EXE
    - Drops file in Windows directory
    - System Location Discovery: System Language Discovery
    PID:1960

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:1440

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Network Service Discovery

T1046

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Windows\mssecsvr.exe

Filesize
2.2MB

MD5
93f898f65882dc83803e0e5c9fd73103

SHA1
ddff5059e398cc8d509e72909bdf2e4356ae2ee8

SHA256
66ae968526be97cbafd7c37a0ef3cb92f15a6e6b285d98629602a79d1d5f5fc2

SHA512
47b70ed73ab295f30d099adaf6b2a795012205e6bb6dc5888b1b39fbfe3ca3b6882dddab6580bea738ae37aa7dce0d8cffd09948bdea32e9b9fd699b63a79617

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