wannacry | ef55bbed02387455cc660149d8933508887ff26c160c8704df2de3cd5d0f7e82

Analysis

max time kernel
150s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
14/01/2025, 19:56

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General

Target
2637da2286536690b1649bee21f335c1.dll
Size 5.0MB
Sample250114-ynnltsxpfw
SHA256 ef55bbed02387455cc660149d8933508887ff26c160c8704df2de3cd5d0f7e82
MD5 2637da2286536690b1649bee21f335c1
SHA1 cf6c307ad8d95c9b71e0902ad1b45cfbe26278d0
SHA512 f7697684cdadd2ec7690dace02b934dfdfb4dfd1fd5928195f5d237a9e3ab207d3aa7aa45ccf4e2f82091c780ed2c02797bc43b53ea4ba4951b97eafe4e8637e
SSDEEP 49152:SnAQqMSPbcBVQej/1INRx+TSqTdX1HkQo6SAA:+DqPoBhz1aRxcSUDk36SA
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

wannacry discovery ransomware worm

Malware Config

Signatures

Wannacry
WannaCry is a ransomware cryptoworm.
ransomware worm wannacry
Wannacry family
wannacry
Contacts a large (3153) 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
4868	mssecsvc.exe
4500	mssecsvc.exe
3104	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

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 6 IoCs

description	pid	Process	procid_target
PID 3928 wrote to memory of 4244	3928	rundll32.exe	85
PID 3928 wrote to memory of 4244	3928	rundll32.exe	85
PID 3928 wrote to memory of 4244	3928	rundll32.exe	85
PID 4244 wrote to memory of 4868	4244	rundll32.exe	86
PID 4244 wrote to memory of 4868	4244	rundll32.exe	86
PID 4244 wrote to memory of 4868	4244	rundll32.exe	86

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\2637da2286536690b1649bee21f335c1.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:3928
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\2637da2286536690b1649bee21f335c1.dll,#1
  2⤵
  - Drops file in Windows directory
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4244
- - C:\WINDOWS\mssecsvc.exe
    C:\WINDOWS\mssecsvc.exe
    3⤵
    - Executes dropped EXE
    - Drops file in Windows directory
    - System Location Discovery: System Language Discovery
    PID:4868
  - - C:\WINDOWS\tasksche.exe
      C:\WINDOWS\tasksche.exe /i
      4⤵
      Executes dropped EXE
      PID:3104

C:\WINDOWS\mssecsvc.exe
C:\WINDOWS\mssecsvc.exe -m security
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Modifies data under HKEY_USERS
PID:4500

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

mssecsvc.exe

Path C:\Windows\mssecsvc.exe
Size 3.6MB
SHA256 cee373187f0b70f79a3e886fce0a8f128af53637bbeb6e9c50af78a1166b4bef
MD5 fc9b6711fd800eccbf960932f0e9b75b
SHA1 54c17f1505a1a908f33ce35238ac32fb8216d113
SHA512 451a277527ca8cc6d05315aa08589c9a3ba432256b9e716a9d74961a09ff2d5808199345cd1c43a61902ce3091b3da945822509ed8d286e3acce0f944e3a6ed6
SSDEEP 49152:2nAQqMSPbcBVQej/1INRx+TSqTdX1HkQo6SAA:yDqPoBhz1aRxcSUDk36SA
MD5 SHA1 SHA512 SSDEEP

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tasksche.exe

Path C:\Windows\tasksche.exe
Size 3.4MB
SHA256 84823e7430ae9e9daeb611e986ca50000a7c66547f5ca060b320101a32a2902c
MD5 16a8fdd68114c10eae3c843faff5916b
SHA1 98555ee1fd1b0a1edcdc64ca3cc38bf8da382c76
SHA512 87e96104fd98f0c46e8765f52f48e9de0f29ca8abd96e270f000a9da4c17ef73fde33441e21ca8e8517bad103a99f3bd2bf05dca3e934bd6dfdba5d1c25c27ea
SSDEEP 49152:nQqMSPbcBVQej/1INRx+TSqTdX1HkQo6SAA:QqPoBhz1aRxcSUDk36SA
MD5 SHA1 SHA512 SSDEEP