juko | c7ff407e5f6495d21ea56ee0bcce579caada995375c3f93eba22088219574879

General

Target
2026-05-11_c2814e5a09aa5795c5e7232a1936db03_elex_wannacry.exe
Size 42KB
Sample260511-ra7dfsbx71
SHA256 c7ff407e5f6495d21ea56ee0bcce579caada995375c3f93eba22088219574879
MD5 c2814e5a09aa5795c5e7232a1936db03
SHA1 d9bd3a0cfb895db2927f4b2e41fa063184cf5936
SHA512 a2d7c7fc31c5add02ac369f9b055b3f1ec72f00ffcd5e374478d5e4e29b4c46339e9c8da20bafffa9987356e7736c00d08269aceb954973edd8617cc1f58df16
SSDEEP 768:zNZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqPNPWQHXFMcnrfrqx4RgutbGHix8f41t:z/LsF2Kerc64sTiX2IV0DgsfrfWJF2+G
TLSH
T18413171776A460D2CDB76074E91A4E30437E9CF664A7B317A72076202DB3D5ACFA02CE
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 2 IoCs

resource	yara_rule
behavioral1/files/0x000b000000024328-4.dat	family_juko
behavioral1/files/0x00080000000244db-12.dat	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	2026-05-11_c2814e5a09aa5795c5e7232a1936db03_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
4860	WINWORD.exe
4392	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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-05-11_c2814e5a09aa5795c5e7232a1936db03_elex_wannacry.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
1880	cmd.exe
3868	PING.EXE
1644	PING.EXE
3948	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3948	PING.EXE
3868	PING.EXE
1644	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4264 wrote to memory of 4860	4264	2026-05-11_c2814e5a09aa5795c5e7232a1936db03_elex_wannacry.exe	85
PID 4860 wrote to memory of 1880	4860	WINWORD.exe	86
PID 1880 wrote to memory of 3868	1880	cmd.exe	88
PID 1880 wrote to memory of 1644	1880	cmd.exe	89
PID 1880 wrote to memory of 3948	1880	cmd.exe	90
PID 1880 wrote to memory of 4392	1880	cmd.exe	91

C:\Users\Admin\AppData\Local\Temp\2026-05-11_c2814e5a09aa5795c5e7232a1936db03_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-11_c2814e5a09aa5795c5e7232a1936db03_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4264
- 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:4860
- - 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\00002962" 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:1880
  - - 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:3868
  - - 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:1644
  - - 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:3948
  - - 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:4392

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

00002962

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002962
Size 42KB
SHA256 4dfae91bcfe2c1315fb452b2856a0ec22bb56ec80bdb7fe7c8d1639906ffbb91
MD5 015d9b4ad12fa9ba50c5dfb88d16e59b
SHA1 2c51909b5db60ce2bae161c1518a9b8acea010e0
SHA512 6e855cbfba1edcfa3c1aed38737d858c32eec397c4c99ebd08623f74b04340adfa990d100e9e6615a57bb1b0356b8c67960fa9e39f40915b05a6c02246763def
SSDEEP 768:zNZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqPNPWQHXFMcnrfrqx4RgutbGHix8f41s:z/LsF2Kerc64sTiX2IV0DgsfrfWJF2+H
TLSH
T11413171776A460D2CDB76074E91A5E30437E9CF664A7B317A72076202DB3D5ACFA02CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 42KB
SHA256 c7ff407e5f6495d21ea56ee0bcce579caada995375c3f93eba22088219574879
MD5 c2814e5a09aa5795c5e7232a1936db03
SHA1 d9bd3a0cfb895db2927f4b2e41fa063184cf5936
SHA512 a2d7c7fc31c5add02ac369f9b055b3f1ec72f00ffcd5e374478d5e4e29b4c46339e9c8da20bafffa9987356e7736c00d08269aceb954973edd8617cc1f58df16
SSDEEP 768:zNZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqPNPWQHXFMcnrfrqx4RgutbGHix8f41t:z/LsF2Kerc64sTiX2IV0DgsfrfWJF2+G
TLSH
T18413171776A460D2CDB76074E91A4E30437E9CF664A7B317A72076202DB3D5ACFA02CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads