juko | 01f6003603ac5b9b7555b1441d343f7ee650c0981b8ca2d3a9ed50514f7f5b36

General

Target
2026-04-25_d7c6e1b2e7d476fa683ed69ec5809fdb_elex_wannacry.exe
Size 56KB
Sample260425-d3ks9set4y
SHA256 01f6003603ac5b9b7555b1441d343f7ee650c0981b8ca2d3a9ed50514f7f5b36
MD5 d7c6e1b2e7d476fa683ed69ec5809fdb
SHA1 58596d74f8848ff7e074a19ab44712946a151d83
SHA512 0a43c021420cae037127f13e2f6b8b5680a3276d014e0e1e8f76f398878471e91965121f72cf2b7ef972a235dc994fa4b60fffd73a0ee0fc2afbbf1779dcc7cf
SSDEEP 1536:PLsF2Kerc64sTiX2IV0DeRa8OKFVG9WGWE:PLy2Kerc64CiGImqRa8OKFE9WBE
TLSH
T1B84319277AE55CD2C15360F0EAE49B308038FD7219279023E794BB9816BEC92DF7169D
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 7 IoCs

resource	yara_rule
behavioral1/memory/2812-0-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral1/files/0x000b00000002416b-5.dat	family_juko
behavioral1/memory/2812-12-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral1/memory/1800-14-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral1/files/0x000800000002425e-15.dat	family_juko
behavioral1/memory/4280-17-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral1/memory/4280-18-0x0000000000400000-0x0000000000422000-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-1-5-21-2714754311-527593155-1440850301-1000\Control Panel\International\Geo\Nation	2026-04-25_d7c6e1b2e7d476fa683ed69ec5809fdb_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2714754311-527593155-1440850301-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
1800	WINWORD.exe
4280	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-1-5-21-2714754311-527593155-1440850301-1000\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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-04-25_d7c6e1b2e7d476fa683ed69ec5809fdb_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

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
2608	PING.EXE
824	cmd.exe
4376	PING.EXE
2972	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2608	PING.EXE
4376	PING.EXE
2972	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2812 wrote to memory of 1800	2812	2026-04-25_d7c6e1b2e7d476fa683ed69ec5809fdb_elex_wannacry.exe	83
PID 1800 wrote to memory of 824	1800	WINWORD.exe	84
PID 824 wrote to memory of 4376	824	cmd.exe	86
PID 824 wrote to memory of 2972	824	cmd.exe	87
PID 824 wrote to memory of 2608	824	cmd.exe	88
PID 824 wrote to memory of 4280	824	cmd.exe	89

C:\Users\Admin\AppData\Local\Temp\2026-04-25_d7c6e1b2e7d476fa683ed69ec5809fdb_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-25_d7c6e1b2e7d476fa683ed69ec5809fdb_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2812
- 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:1800
- - 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\00006502" 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:824
  - - 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:4376
  - - 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:2972
  - - 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:2608
  - - 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:4280

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

00006502

Path C:\Users\Admin\AppData\Roaming\Mozilla\00006502
Size 56KB
SHA256 a4ac24cfc1bdaba136066ddf333562581cfa4bff870d16e6dcc64e956c8df740
MD5 8fd205997b23869f7726fdba088b405c
SHA1 cfa7442696ba45c3b9ab0a0b776a2f226bdba92a
SHA512 9d06342b99585ab8c1e701376a5ac7f6af14542efaf608587e6b71feea5b048cda19920e45c2b3380a327f1e4324082f520101a21a535482c0bfe37eb0497330
SSDEEP 1536:PLsF2Kerc64sTiX2IV0DeRa8OKFVG9WGW3:PLy2Kerc64CiGImqRa8OKFE9WB3
TLSH
T16B4319277AE55CD2C15360F0EAE49B308038FD7219279023E794BB9816BEC92DF7169D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 56KB
SHA256 01f6003603ac5b9b7555b1441d343f7ee650c0981b8ca2d3a9ed50514f7f5b36
MD5 d7c6e1b2e7d476fa683ed69ec5809fdb
SHA1 58596d74f8848ff7e074a19ab44712946a151d83
SHA512 0a43c021420cae037127f13e2f6b8b5680a3276d014e0e1e8f76f398878471e91965121f72cf2b7ef972a235dc994fa4b60fffd73a0ee0fc2afbbf1779dcc7cf
SSDEEP 1536:PLsF2Kerc64sTiX2IV0DeRa8OKFVG9WGWE:PLy2Kerc64CiGImqRa8OKFE9WBE
TLSH
T1B84319277AE55CD2C15360F0EAE49B308038FD7219279023E794BB9816BEC92DF7169D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1800-14-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/2812-0-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/2812-12-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/4280-17-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/4280-18-0x0000000000400000-0x0000000000422000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads