juko | e5d8e8fd8473dbd8c3ea9ca3e6d70457cbb2b55d586a36f41c39fb9c749e1b2d

General

Target
2026-08-25_ce59a7e39c365ea9dd5ffc70abbe8b91_elex_wannacry.exe
Size 49KB
Sample260826-kl3fbasvgv
SHA256 e5d8e8fd8473dbd8c3ea9ca3e6d70457cbb2b55d586a36f41c39fb9c749e1b2d
MD5 ce59a7e39c365ea9dd5ffc70abbe8b91
SHA1 ebf0e72ead822edccc421e405292b5909a034347
SHA512 0f21a1fe9201c292fc827ecd9bc1b8223b5330c7eaf4e50e35789f55a19b123c6b510639256b6b06b995c1af8e19f36a34e753e9cd18a25f2ac52790bcab042c
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2X:VLy2Kerc64CiGImVu8p4kojWh2X
TLSH
T1F3334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
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/64-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x0017000000016903-6.dat	family_juko
behavioral1/memory/64-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/3204-14-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x000c000000024390-15.dat	family_juko
behavioral1/memory/1568-17-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/1568-18-0x0000000000400000-0x0000000000420000-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-1-5-21-1074038928-2032447174-945360078-1000\Control Panel\International\Geo\Nation	2026-08-25_ce59a7e39c365ea9dd5ffc70abbe8b91_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1074038928-2032447174-945360078-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
3204	WINWORD.exe
1568	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-1-5-21-1074038928-2032447174-945360078-1000\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
1260	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	2026-08-25_ce59a7e39c365ea9dd5ffc70abbe8b91_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
2356	PING.EXE
1260	cmd.exe
2968	PING.EXE
1144	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2968	PING.EXE
1144	PING.EXE
2356	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 64 wrote to memory of 3204	64	2026-08-25_ce59a7e39c365ea9dd5ffc70abbe8b91_elex_wannacry.exe	85
PID 3204 wrote to memory of 1260	3204	WINWORD.exe	86
PID 1260 wrote to memory of 2968	1260	cmd.exe	88
PID 1260 wrote to memory of 1144	1260	cmd.exe	91
PID 1260 wrote to memory of 2356	1260	cmd.exe	95
PID 1260 wrote to memory of 1568	1260	cmd.exe	99

C:\Users\Admin\AppData\Local\Temp\2026-08-25_ce59a7e39c365ea9dd5ffc70abbe8b91_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-25_ce59a7e39c365ea9dd5ffc70abbe8b91_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:64
- 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:3204
- - 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\00002511" 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:1260
  - - 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:2968
  - - 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:1144
  - - 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:2356
  - - 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:1568

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

00002511

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002511
Size 49KB
SHA256 f65550c8524cd15a2543fd86f75b3f0aab8f0ae05bfc3a7c4c7219ab048a51ee
MD5 dc087e3cd1da67c42813d5ceffa1fe25
SHA1 0182b07e2219ffe7a0b605572f412bdf49e7117f
SHA512 3d4b6ccd83b4e6628ed83b04508a7ea50b40d7c435db0d1bbacda31052f03d3c8a324d711a9f46243ade1798f61245a799024bf99beb77299c7fcf42ab0431a3
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2K:VLy2Kerc64CiGImVu8p4kojWh2K
TLSH
T1F0334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 e5d8e8fd8473dbd8c3ea9ca3e6d70457cbb2b55d586a36f41c39fb9c749e1b2d
MD5 ce59a7e39c365ea9dd5ffc70abbe8b91
SHA1 ebf0e72ead822edccc421e405292b5909a034347
SHA512 0f21a1fe9201c292fc827ecd9bc1b8223b5330c7eaf4e50e35789f55a19b123c6b510639256b6b06b995c1af8e19f36a34e753e9cd18a25f2ac52790bcab042c
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2X:VLy2Kerc64CiGImVu8p4kojWh2X
TLSH
T1F3334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/64-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/64-12-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/1568-17-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/1568-18-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/3204-14-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads