juko | ddcf2ed8bc6dd391edd67a19c721fd283910b5877ab800cc86bb1312456cebb3

General

Target
2026-05-29_ace81f8e15a8308008061f5bbafe289a_elex_wannacry.exe
Size 32KB
Sample260529-hcn58aev21
SHA256 ddcf2ed8bc6dd391edd67a19c721fd283910b5877ab800cc86bb1312456cebb3
MD5 ace81f8e15a8308008061f5bbafe289a
SHA1 aadb17d412248ea7832f95ffe6f1d9730c41d4cd
SHA512 87851f8bbd60428f55b43f1148402f9d234f0a6e9fd6de4111ef958d9db27a144e1b6355339d70b7d71c07c7acd4345272ffb3749ad5b642f6323726683db70f
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpf:OLsF2Kerc64sTiX2IV0Dhuf
TLSH
T125E23A1B2AA17052C59320B0FA991F34C57D4DB6116BB066FB417B6928B2D63CFB0DCE
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/0x000f0000000231e4-4.dat	family_juko
behavioral1/files/0x000900000002464e-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-1-5-21-3053180483-1881419501-3594244048-1000\Control Panel\International\Geo\Nation	WINWORD.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3053180483-1881419501-3594244048-1000\Control Panel\International\Geo\Nation	2026-05-29_ace81f8e15a8308008061f5bbafe289a_elex_wannacry.exe

Executes dropped EXE 2 IoCs

pid	Process
3924	WINWORD.exe
3772	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-1-5-21-3053180483-1881419501-3594244048-1000\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	2026-05-29_ace81f8e15a8308008061f5bbafe289a_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
888	cmd.exe
2128	PING.EXE
3680	PING.EXE
5924	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2128	PING.EXE
3680	PING.EXE
5924	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2112 wrote to memory of 3924	2112	2026-05-29_ace81f8e15a8308008061f5bbafe289a_elex_wannacry.exe	86
PID 3924 wrote to memory of 888	3924	WINWORD.exe	90
PID 888 wrote to memory of 2128	888	cmd.exe	92
PID 888 wrote to memory of 3680	888	cmd.exe	93
PID 888 wrote to memory of 5924	888	cmd.exe	96
PID 888 wrote to memory of 3772	888	cmd.exe	99

C:\Users\Admin\AppData\Local\Temp\2026-05-29_ace81f8e15a8308008061f5bbafe289a_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-29_ace81f8e15a8308008061f5bbafe289a_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2112
- 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:3924
- - 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\000074FF" 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:888
  - - 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:2128
  - - 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:3680
  - - 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:5924
  - - 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:3772

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

000074FF

Path C:\Users\Admin\AppData\Roaming\Mozilla\000074FF
Size 32KB
SHA256 9166f94560d5d0917376a9f48805d531b19397e2e03574f3f421550d9c41e8b7
MD5 bf414ee182835e11752320a5aa5a4136
SHA1 0f6e85ee935b97ec713eeb05e391a9505dba285e
SHA512 0e5f1a6333b6330ea7f8bf070b843f0160894ce03fab2dc3f811ae0fec7e0e5fc9d0b773007eae70c1e1ef29f2a5f133e9140aa24a4a1c0f1a1e2efe0219dfd7
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpF:OLsF2Kerc64sTiX2IV0DhuF
TLSH
T16AE23A1B2AA17052C59320B0FA991F34C57D4CB6116BB066FB417B6928B2D63CFB0DCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 32KB
SHA256 ddcf2ed8bc6dd391edd67a19c721fd283910b5877ab800cc86bb1312456cebb3
MD5 ace81f8e15a8308008061f5bbafe289a
SHA1 aadb17d412248ea7832f95ffe6f1d9730c41d4cd
SHA512 87851f8bbd60428f55b43f1148402f9d234f0a6e9fd6de4111ef958d9db27a144e1b6355339d70b7d71c07c7acd4345272ffb3749ad5b642f6323726683db70f
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpf:OLsF2Kerc64sTiX2IV0Dhuf
TLSH
T125E23A1B2AA17052C59320B0FA991F34C57D4DB6116BB066FB417B6928B2D63CFB0DCE
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