juko | d90dbab6eae8dc8c5b240b843e12092d90ff733ebf1a6b90213a3bff79dbbb2c

General

Target
2026-07-30_d6e61c1e124129f187133579b3394630_elex_wannacry.exe
Size 56KB
Sample260730-ve5bfadl21
SHA256 d90dbab6eae8dc8c5b240b843e12092d90ff733ebf1a6b90213a3bff79dbbb2c
MD5 d6e61c1e124129f187133579b3394630
SHA1 4d35caa5aa96a1b26be2abf1061aa19258376cb5
SHA512 fc62617d499f2e02dd8d025e68755fa32b93d0db2be2539bdc38a4ee46d3fcf91c1b75b6130566c21998e1f79ba6f58b7babafdb34c69d9dff83476492fb5293
SSDEEP 1536:PLsF2Kerc64sTiX2IV0DeRa8OKFVG9WGW8:PLy2Kerc64CiGImqRa8OKFE9WB8
TLSH
T19F4319277AE55CD2C15360F0EAE49B308038FD7219279023E794BB9816BEC92DF7169D
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery execution juko persistence trojan

Malware Config

Signatures

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

Detects Juko 7 IoCs

resource	yara_rule
behavioral1/memory/3868-0-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral1/files/0x000b0000000243b3-5.dat	family_juko
behavioral1/memory/3868-12-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral1/memory/4308-14-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral1/files/0x000300000001e696-15.dat	family_juko
behavioral1/memory/2240-17-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral1/memory/2240-18-0x0000000000400000-0x0000000000422000-memory.dmp	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	2026-07-30_d6e61c1e124129f187133579b3394630_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-668679576-120646659-2289335452-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
4308	WINWORD.exe
2240	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

Executes a command shell one-liner 1 TTPs 1 IoCs

Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

execution

Windows Command Shell

T1059.003

pid	Process
1500	cmd.exe

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	2026-07-30_d6e61c1e124129f187133579b3394630_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
4352	PING.EXE
4016	PING.EXE
4128	PING.EXE
1500	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4352	PING.EXE
4016	PING.EXE
4128	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3868 wrote to memory of 4308	3868	2026-07-30_d6e61c1e124129f187133579b3394630_elex_wannacry.exe	87
PID 4308 wrote to memory of 1500	4308	WINWORD.exe	88
PID 1500 wrote to memory of 4352	1500	cmd.exe	91
PID 1500 wrote to memory of 4016	1500	cmd.exe	92
PID 1500 wrote to memory of 4128	1500	cmd.exe	93
PID 1500 wrote to memory of 2240	1500	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-07-30_d6e61c1e124129f187133579b3394630_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-30_d6e61c1e124129f187133579b3394630_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3868
- 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:4308
- - 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\00001715" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - Executes a command shell one-liner
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:1500
  - - 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:4352
  - - 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:4016
  - - 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:4128
  - - 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:2240

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

Windows Command Shell

1

T1059.003

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

00001715

Path C:\Users\Admin\AppData\Roaming\Mozilla\00001715
Size 56KB
SHA256 050d71c5a6373b6eb9a0c3057b3a146fe442bf3eccd5ea27435d6efce719ebb9
MD5 da25db17ab1206711901498fefb36975
SHA1 2e55ab3fb802536fdb622f7bc5507ee8af7a3dcf
SHA512 6251b773af4331fc0d0a2363487abffdbbd59dd45878a67fabfd10adef7a6f398c65d989db6953dcf458124307ea1bacae6f77e8bc7e2388c182f364f37dc2ea
SSDEEP 1536:PLsF2Kerc64sTiX2IV0DeRa8OKFVG9WGWQ:PLy2Kerc64CiGImqRa8OKFE9WBQ
TLSH
T1104319277AE55CD2C15360F0EAE49B308038FD7219279023E794BB9816BEC92DF7169D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 56KB
SHA256 d90dbab6eae8dc8c5b240b843e12092d90ff733ebf1a6b90213a3bff79dbbb2c
MD5 d6e61c1e124129f187133579b3394630
SHA1 4d35caa5aa96a1b26be2abf1061aa19258376cb5
SHA512 fc62617d499f2e02dd8d025e68755fa32b93d0db2be2539bdc38a4ee46d3fcf91c1b75b6130566c21998e1f79ba6f58b7babafdb34c69d9dff83476492fb5293
SSDEEP 1536:PLsF2Kerc64sTiX2IV0DeRa8OKFVG9WGW8:PLy2Kerc64CiGImqRa8OKFE9WB8
TLSH
T19F4319277AE55CD2C15360F0EAE49B308038FD7219279023E794BB9816BEC92DF7169D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2240-17-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/2240-18-0x0000000000400000-0x0000000000422000-memory.dmp

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memory/3868-0-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/3868-12-0x0000000000400000-0x0000000000422000-memory.dmp

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memory/4308-14-0x0000000000400000-0x0000000000422000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads