juko | 9a034ea15a9f406eb0ec4c2c950448be358a8e2570870230a4254e0f83d835bd

General

Target
2026-05-18_c78025b8c36ad5325b1b35dc6be5e2ef_elex_wannacry.exe
Size 53KB
Sample260518-v9veqaex2p
SHA256 9a034ea15a9f406eb0ec4c2c950448be358a8e2570870230a4254e0f83d835bd
MD5 c78025b8c36ad5325b1b35dc6be5e2ef
SHA1 d5eb95b27fad43e3221f2677575b19d1fb759e5b
SHA512 3504c701cabb7ab05a7a398b3406a9f36d8202e19c4110f3bdee4c5e34307d376dcc4ab9fdd7cd2d1214d45cc2df3ab3a2941de30fe137fded40ec8bcf930f5e
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq2e:3Ly2Kerc64CiGIm1tcBMUOOFe
TLSH
T18B335C176A459056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery juko persistence trojan

Malware Config

Signatures

Family: Juko
Juko is a trojan written in C++.
trojan juko

Detects Juko 2 IoCs

resource	yara_rule
behavioral1/files/0x000b0000000242fc-4.dat	family_juko
behavioral1/files/0x000a000000024495-12.dat	family_juko

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-668679576-120646659-2289335452-1000\Control Panel\International\Geo\Nation	WINWORD.exe
Key value queried	\REGISTRY\USER\S-1-5-21-668679576-120646659-2289335452-1000\Control Panel\International\Geo\Nation	2026-05-18_c78025b8c36ad5325b1b35dc6be5e2ef_elex_wannacry.exe

Executes dropped EXE 2 IoCs

pid	Process
2852	WINWORD.exe
4368	WINWORD.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-668679576-120646659-2289335452-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\WINWORD = "C:\\Users\\Admin\\AppData\\Roaming\\Mozilla\\WINWORD.exe -r"	WINWORD.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 7 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	2026-05-18_c78025b8c36ad5325b1b35dc6be5e2ef_elex_wannacry.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 4 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
4080	cmd.exe
4668	PING.EXE
5048	PING.EXE
4116	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4668	PING.EXE
5048	PING.EXE
4116	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3616 wrote to memory of 2852	3616	2026-05-18_c78025b8c36ad5325b1b35dc6be5e2ef_elex_wannacry.exe	85
PID 2852 wrote to memory of 4080	2852	WINWORD.exe	86
PID 4080 wrote to memory of 4668	4080	cmd.exe	88
PID 4080 wrote to memory of 5048	4080	cmd.exe	89
PID 4080 wrote to memory of 4116	4080	cmd.exe	90
PID 4080 wrote to memory of 4368	4080	cmd.exe	91

C:\Users\Admin\AppData\Local\Temp\2026-05-18_c78025b8c36ad5325b1b35dc6be5e2ef_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-18_c78025b8c36ad5325b1b35dc6be5e2ef_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3616
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2852
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c ping 127.0.0.1 -n 2&del "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe"&ping 127.0.0.1 -n 2&rename "C:\Users\Admin\AppData\Roaming\Mozilla\00003A47" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:4080
  - - C:\Windows\SysWOW64\PING.EXE
      ping 127.0.0.1 -n 2
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:4668
  - - C:\Windows\SysWOW64\PING.EXE
      ping 127.0.0.1 -n 2
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:5048
  - - C:\Windows\SysWOW64\PING.EXE
      ping 127.0.0.1 -n 2
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:4116
  - - C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
      "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
      4⤵
      Executes dropped EXE
      Adds Run key to start application
      System Location Discovery: System Language Discovery
      PID:4368

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

Remote System Discovery

1

T1018

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

System Network Configuration Discovery

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

00003A47

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003A47
Size 53KB
SHA256 9a15ff26e919ed24a9ec218de96b562e338d09b7acc7bcaac52602387198328c
MD5 1d6141c842d5587628b0e785533d4d26
SHA1 5233840318fe4402ad6658f7112729f977cbca60
SHA512 ee783c1a1ab8008989e20108cc8ab755971a6e293c7c45be9a7e5fe95eaaf74208c14b86ea5dd8cbc8585b91d2862a20201b2e1f7f346e2e6f820cb923ffb5b6
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq2c:3Ly2Kerc64CiGIm1tcBMUOOFc
TLSH
T129335C176A459056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 53KB
SHA256 9a034ea15a9f406eb0ec4c2c950448be358a8e2570870230a4254e0f83d835bd
MD5 c78025b8c36ad5325b1b35dc6be5e2ef
SHA1 d5eb95b27fad43e3221f2677575b19d1fb759e5b
SHA512 3504c701cabb7ab05a7a398b3406a9f36d8202e19c4110f3bdee4c5e34307d376dcc4ab9fdd7cd2d1214d45cc2df3ab3a2941de30fe137fded40ec8bcf930f5e
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq2e:3Ly2Kerc64CiGIm1tcBMUOOFe
TLSH
T18B335C176A459056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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