juko | 987cc501bfc53c38b872d92d32abd8bb269b0dd23e1646fb3f38382e8dd3eaff

General

Target
2026-06-03_9c750778461e649c0a886391bad1a78c_elex_wannacry.exe
Size 49KB
Sample260603-eb6gbshs21
SHA256 987cc501bfc53c38b872d92d32abd8bb269b0dd23e1646fb3f38382e8dd3eaff
MD5 9c750778461e649c0a886391bad1a78c
SHA1 feadbd9f60c3995f60da6e08b10b08c4d581d1b8
SHA512 682d3d2487423644596cb87cd162f6d9fc182167ae4fd1f61d30ec260c59f4d2638adeff0e372b35c07f405ed7f040e0eb4342037d80630e59f35db551f724d0
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h29:VLy2Kerc64CiGImVu8p4kojWh29
TLSH
T1FC334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
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 8 IoCs

resource	yara_rule
behavioral1/memory/4864-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x0008000000009dbf-5.dat	family_juko
behavioral1/memory/2292-11-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/4864-13-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/2292-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x000d000000024292-16.dat	family_juko
behavioral1/memory/4928-18-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/4928-19-0x0000000000400000-0x0000000000420000-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-1-5-21-204488895-2999877624-296153668-1000\Control Panel\International\Geo\Nation	2026-06-03_9c750778461e649c0a886391bad1a78c_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-204488895-2999877624-296153668-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
2292	WINWORD.exe
4928	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-1-5-21-204488895-2999877624-296153668-1000\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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-06-03_9c750778461e649c0a886391bad1a78c_elex_wannacry.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
3728	cmd.exe
4828	PING.EXE
4804	PING.EXE
1904	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4828	PING.EXE
4804	PING.EXE
1904	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4864 wrote to memory of 2292	4864	2026-06-03_9c750778461e649c0a886391bad1a78c_elex_wannacry.exe	89
PID 2292 wrote to memory of 3728	2292	WINWORD.exe	90
PID 3728 wrote to memory of 4828	3728	cmd.exe	92
PID 3728 wrote to memory of 4804	3728	cmd.exe	94
PID 3728 wrote to memory of 1904	3728	cmd.exe	95
PID 3728 wrote to memory of 4928	3728	cmd.exe	98

C:\Users\Admin\AppData\Local\Temp\2026-06-03_9c750778461e649c0a886391bad1a78c_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-06-03_9c750778461e649c0a886391bad1a78c_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4864
- 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:2292
- - 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\00000D1E" 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:3728
  - - 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:4828
  - - 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:4804
  - - 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:1904
  - - 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:4928

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

00000D1E

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000D1E
Size 49KB
SHA256 593684157d6c9aa29610180b27a8745f9b2840b054984d6a6a4427b6f173900d
MD5 40e49df34b14cb425c3bc3f6fd8af0e9
SHA1 372691cd82de45a9c35aee46a83494a0a7a91a21
SHA512 cc3659435ec23b93d89a6895dc58d5417047e46ad58f01d24e3749bb5978ea95f3327da8279b6f5bb9d59c110051e248acd2d9660bf714e70a182c93df724f99
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2p:VLy2Kerc64CiGImVu8p4kojWh2p
TLSH
T102334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 987cc501bfc53c38b872d92d32abd8bb269b0dd23e1646fb3f38382e8dd3eaff
MD5 9c750778461e649c0a886391bad1a78c
SHA1 feadbd9f60c3995f60da6e08b10b08c4d581d1b8
SHA512 682d3d2487423644596cb87cd162f6d9fc182167ae4fd1f61d30ec260c59f4d2638adeff0e372b35c07f405ed7f040e0eb4342037d80630e59f35db551f724d0
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h29:VLy2Kerc64CiGImVu8p4kojWh29
TLSH
T1FC334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2292-11-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/2292-15-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/4864-0-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/4864-13-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/4928-18-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/4928-19-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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