wannacry | 1cfb94930b9c7a8e7533dcbf76734becf9e4b9cd8124b2aaca67ae1ef32364e1

General

Target
1cfb94930b9c7a8e7533dcbf76734becf9e4b9cd8124b2aaca67ae1ef32364e1.dll
Size 5.0MB
Sample261107-l7k9laee92
SHA256 1cfb94930b9c7a8e7533dcbf76734becf9e4b9cd8124b2aaca67ae1ef32364e1
MD5 bfb78d9fab107cc26b854ac8ba7ae10b
SHA1 555c14154cd7ba067805e695e024c83ae880d0f2
SHA512 e6c401c479d748a64b0794a56759c607662317b1e04a45d9be1255362d0728d81e4dc58d2ffb5b793e55804739019f5dec638e99381bec4763e9c6e1cd1207c3
SSDEEP 49152:SnAQqMSPbcBVQej/1INRx+TSqTdX1HkQo6SAA6v6:+DqPoBhz1aRxcSUDk36SAv
TLSH
T17A36BF00DBE41B60D2F25FB679B797006776BE158A6B925E2650600E1C73F1CCDA2B3E
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 (3352) 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
5228	mssecsvc.exe
5752	mssecsvc.exe
5972	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

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
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\AutoDetect = "0"	mssecsvc.exe
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

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 756 wrote to memory of 4764	756	rundll32.exe	88
PID 4764 wrote to memory of 5228	4764	rundll32.exe	89

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\1cfb94930b9c7a8e7533dcbf76734becf9e4b9cd8124b2aaca67ae1ef32364e1.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:756
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\1cfb94930b9c7a8e7533dcbf76734becf9e4b9cd8124b2aaca67ae1ef32364e1.dll,#1
  2⤵
  - Drops file in Windows directory
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4764
- - 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:5228
  - - C:\WINDOWS\tasksche.exe
      C:\WINDOWS\tasksche.exe /i
      4⤵
      Executes dropped EXE
      PID:5972

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:5752

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

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Downloads

mssecsvc.exe

Path C:\Windows\mssecsvc.exe
Size 3.6MB
SHA256 ff277cbbb3a90e1859faa0c5eaa5509d9607a4e6c34e02cd13bde192eb819867
MD5 f09fab87c9a34575c2313c99dbbc630e
SHA1 fa11cda0361c256b8e10c7b58cd6186e9d9d9029
SHA512 708014207e2f21e8089625ac82153943a8946e898276b29c846ce7550636bcf802322c5903edb4534a59612f9284bf83c69982faabfd8215440cfce43b2276dc
SSDEEP 49152:2nAQqMSPbcBVQej/1INRx+TSqTdX1HkQo6SAA6v6:yDqPoBhz1aRxcSUDk36SAv
TLSH
T16B06BF00DBE41B60D2F25FB679B797006776BE158A6B925E2650600E1C73F1CCDA2B3E
MD5 SHA1 SHA512 SSDEEP TLSH

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tasksche.exe

Path C:\Windows\tasksche.exe
Size 3.4MB
SHA256 2b96465c3d2773b4a7e8588d92728dee7baa94097f042106f42ee2d8cee18af6
MD5 e5a37c7e3b09552cc7d03b270ecd873c
SHA1 9e8e700e1617621911181583164d16f49cdec3be
SHA512 cde5ed4b77d2afde2ef3ec8db325c2a2e43b52bb4999076245a8efff407c1cbd0ca795b0f6a75daea063c231ed9cb0bfe9ccad2564e5268aa9bb922d301816d3
SSDEEP 49152:nQqMSPbcBVQej/1INRx+TSqTdX1HkQo6SAA6v6:QqPoBhz1aRxcSUDk36SAv
TLSH
T15EF5AE00DBE41B60E2F25FB679B7930067797E15DA6B929E2650600E1C73F1CCD92B2E
MD5 SHA1 SHA512 SSDEEP TLSH