juko | e89261b0df8705bffabd2d3b493ab7e3664abf30a9f26cea46cf25b027942d6f

General

Target
2026-05-07_94b73a6fb3d5df67d323052dfb580548_elex_wannacry.exe
Size 49KB
Sample260507-cc71fadw3x
SHA256 e89261b0df8705bffabd2d3b493ab7e3664abf30a9f26cea46cf25b027942d6f
MD5 94b73a6fb3d5df67d323052dfb580548
SHA1 0e83bc175e2629ab9bd9694e4973251f886d9006
SHA512 e167ed65c76e59baffb7e2d86bfa03c1dc55e325ff783b0ff8452b1c4b5dd1d9171202cc82ac7f88bf798048f8a1992d56c815d470a54c76bbc91a3dcb14619e
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2k:VLy2Kerc64CiGImVucp4kojWh2k
TLSH
T198334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
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/2024-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x000b000000024238-6.dat	family_juko
behavioral1/memory/2024-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/2576-14-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x00090000000244ac-15.dat	family_juko
behavioral1/memory/4964-17-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/4964-19-0x0000000000400000-0x0000000000420000-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-1-5-21-312252282-3884318443-358092420-1000\Control Panel\International\Geo\Nation	2026-05-07_94b73a6fb3d5df67d323052dfb580548_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-312252282-3884318443-358092420-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
2576	WINWORD.exe
4964	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-1-5-21-312252282-3884318443-358092420-1000\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	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	2026-05-07_94b73a6fb3d5df67d323052dfb580548_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

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
4544	cmd.exe
4836	PING.EXE
4460	PING.EXE
3692	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4836	PING.EXE
4460	PING.EXE
3692	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2024 wrote to memory of 2576	2024	2026-05-07_94b73a6fb3d5df67d323052dfb580548_elex_wannacry.exe	85
PID 2576 wrote to memory of 4544	2576	WINWORD.exe	86
PID 4544 wrote to memory of 4836	4544	cmd.exe	88
PID 4544 wrote to memory of 4460	4544	cmd.exe	89
PID 4544 wrote to memory of 3692	4544	cmd.exe	90
PID 4544 wrote to memory of 4964	4544	cmd.exe	91

C:\Users\Admin\AppData\Local\Temp\2026-05-07_94b73a6fb3d5df67d323052dfb580548_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-07_94b73a6fb3d5df67d323052dfb580548_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2024
- 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:2576
- - 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\00000892" 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:4544
  - - 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:4836
  - - 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:4460
  - - 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:3692
  - - 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:4964

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

00000892

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000892
Size 49KB
SHA256 210bb8c02da6d7314287913e85c50121833b244e52ca94f4ea9bf069e64f50b0
MD5 4cc985673e4f8ec1c8c27cc4ec82f17d
SHA1 cc8417aa2b1595f0ec05ff7b797847f4e8df3cd8
SHA512 037584c8a196b6c211bf41aad308edb7c9b8e84fa37c24a943a4439b8e1be2b5947afc685d3228bd73280d4a58502f15db6dc842d84654796c9b15dc7609f90b
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2j:VLy2Kerc64CiGImVucp4kojWh2j
TLSH
T17B334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 e89261b0df8705bffabd2d3b493ab7e3664abf30a9f26cea46cf25b027942d6f
MD5 94b73a6fb3d5df67d323052dfb580548
SHA1 0e83bc175e2629ab9bd9694e4973251f886d9006
SHA512 e167ed65c76e59baffb7e2d86bfa03c1dc55e325ff783b0ff8452b1c4b5dd1d9171202cc82ac7f88bf798048f8a1992d56c815d470a54c76bbc91a3dcb14619e
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2k:VLy2Kerc64CiGImVucp4kojWh2k
TLSH
T198334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2024-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2024-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2576-14-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4964-17-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4964-19-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4964-18-0x0000000002A60000-0x0000000002AC3000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads