juko | 8677e5b1385ec986a1051448220aeb4ad1542cde8d71d83e1c0b0c4171495bee

General

Target
2026-05-10_1d6a279a82c4892c213aef8a3e6dc60c_elex_wannacry.exe
Size 30KB
Sample260510-x77clsg19m
SHA256 8677e5b1385ec986a1051448220aeb4ad1542cde8d71d83e1c0b0c4171495bee
MD5 1d6a279a82c4892c213aef8a3e6dc60c
SHA1 1808dcf4b4f3c1be0bacdc7905d4c4d4d0e2661b
SHA512 cff703e6d332c421a6a7bcd940361e6c74df035e52c43502d92571b8ce13a0160eeb791f3079259749884a26ac5d6f3ecb7e86116a6ef2e32dcd2e57cb7fb536
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHXD:tLsF2Kerc64sTiX2IV0DzloD
TLSH
T1E5E26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
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/0x000c000000023759-4.dat	family_juko
behavioral1/files/0x00090000000244a2-11.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-1-5-21-721190819-434563495-2007910846-1000\Control Panel\International\Geo\Nation	WINWORD.exe
Key value queried	\REGISTRY\USER\S-1-5-21-721190819-434563495-2007910846-1000\Control Panel\International\Geo\Nation	2026-05-10_1d6a279a82c4892c213aef8a3e6dc60c_elex_wannacry.exe

Executes dropped EXE 2 IoCs

pid	Process
4376	WINWORD.exe
3096	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-1-5-21-721190819-434563495-2007910846-1000\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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-05-10_1d6a279a82c4892c213aef8a3e6dc60c_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

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
4520	cmd.exe
3024	PING.EXE
5556	PING.EXE
5548	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3024	PING.EXE
5556	PING.EXE
5548	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4364 wrote to memory of 4376	4364	2026-05-10_1d6a279a82c4892c213aef8a3e6dc60c_elex_wannacry.exe	85
PID 4376 wrote to memory of 4520	4376	WINWORD.exe	86
PID 4520 wrote to memory of 3024	4520	cmd.exe	88
PID 4520 wrote to memory of 5556	4520	cmd.exe	89
PID 4520 wrote to memory of 5548	4520	cmd.exe	90
PID 4520 wrote to memory of 3096	4520	cmd.exe	91

C:\Users\Admin\AppData\Local\Temp\2026-05-10_1d6a279a82c4892c213aef8a3e6dc60c_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-10_1d6a279a82c4892c213aef8a3e6dc60c_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4364
- 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:4376
- - 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\000053F3" 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:4520
  - - 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:3024
  - - 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:5556
  - - 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:5548
  - - 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:3096

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

000053F3

Path C:\Users\Admin\AppData\Roaming\Mozilla\000053F3
Size 30KB
SHA256 806acea48f6044f94a4f131c08cf6e27205c5c6543a2f3c701952a6f05d5fb94
MD5 98dc8c73397f30e360dca8f14ecc16a8
SHA1 9fe594ee47efb9b29282574569156e71a80de4df
SHA512 6f8f09823dc30764c61b44143670abb32e49894d9513197874a373dfe875a5c14e3a06f81e178690eb0bca08dcdd23e41f1db30f8a0d713373d60ab4431697ef
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHXd:tLsF2Kerc64sTiX2IV0Dzlod
TLSH
T1F2E26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 30KB
SHA256 8677e5b1385ec986a1051448220aeb4ad1542cde8d71d83e1c0b0c4171495bee
MD5 1d6a279a82c4892c213aef8a3e6dc60c
SHA1 1808dcf4b4f3c1be0bacdc7905d4c4d4d0e2661b
SHA512 cff703e6d332c421a6a7bcd940361e6c74df035e52c43502d92571b8ce13a0160eeb791f3079259749884a26ac5d6f3ecb7e86116a6ef2e32dcd2e57cb7fb536
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHXD:tLsF2Kerc64sTiX2IV0DzloD
TLSH
T1E5E26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3096-13-0x0000000002510000-0x000000000256F000-memory.dmp

Download

memory/4364-7-0x0000000002020000-0x000000000207F000-memory.dmp

Download

memory/4376-10-0x0000000002020000-0x000000000207F000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads