juko | bb6ac13115828e5558d1dd7639348136cf41e85d5cb4c53e55e6a0bd7e948c2d

General

Target
2026-07-04_109b5ff0adee155098bb527097c4adbe_elex_wannacry.exe
Size 88KB
Sample260704-e2mrxaa16t
SHA256 bb6ac13115828e5558d1dd7639348136cf41e85d5cb4c53e55e6a0bd7e948c2d
MD5 109b5ff0adee155098bb527097c4adbe
SHA1 2c21c664d04e5a2b5e947132103891493854570d
SHA512 b4c47ca688fd032cb3929ec06565fee0faa3af00b055a7d4cae4869673f68ec7f37fc528c8341ed824bc12045fbbe789a6a9db27475fae9f5d18fe208f04d995
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsK:zLy2Kerc64CiGImHc/28wzCBlycJWee5
TLSH
T109933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
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/4236-0-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral1/files/0x0005000000023252-5.dat	family_juko
behavioral1/memory/4236-12-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral1/memory/4076-14-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral1/files/0x00080000000244a6-15.dat	family_juko
behavioral1/memory/3528-17-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral1/memory/3528-18-0x0000000000400000-0x000000000042A000-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-1-5-21-668679576-120646659-2289335452-1000\Control Panel\International\Geo\Nation	2026-07-04_109b5ff0adee155098bb527097c4adbe_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-668679576-120646659-2289335452-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
4076	WINWORD.exe
3528	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-1-5-21-668679576-120646659-2289335452-1000\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	2026-07-04_109b5ff0adee155098bb527097c4adbe_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
3496	cmd.exe
4712	PING.EXE
4920	PING.EXE
4128	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4712	PING.EXE
4920	PING.EXE
4128	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4236 wrote to memory of 4076	4236	2026-07-04_109b5ff0adee155098bb527097c4adbe_elex_wannacry.exe	88
PID 4076 wrote to memory of 3496	4076	WINWORD.exe	89
PID 3496 wrote to memory of 4712	3496	cmd.exe	91
PID 3496 wrote to memory of 4920	3496	cmd.exe	94
PID 3496 wrote to memory of 4128	3496	cmd.exe	97
PID 3496 wrote to memory of 3528	3496	cmd.exe	98

C:\Users\Admin\AppData\Local\Temp\2026-07-04_109b5ff0adee155098bb527097c4adbe_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-04_109b5ff0adee155098bb527097c4adbe_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4236
- 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:4076
- - 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\000035DC" 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:3496
  - - 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:4712
  - - 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:4920
  - - 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:4128
  - - 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:3528

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

000035DC

Path C:\Users\Admin\AppData\Roaming\Mozilla\000035DC
Size 88KB
SHA256 eca6752fcf60989086ef983bb8419e1a309254846b70d836aeefdb698fff8422
MD5 2282d7e017a21ee07d351cd58618bf43
SHA1 7ea48ae3385609f297283a14a9e9f09aecb2747a
SHA512 976080a574acdc08bbcd8f54075c8713ba59535e694d3cff81ac2fa6bd5649e60c206f4dc529d80111c998f52e880412c49b8fa31173bca99af5089b380e4d2e
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsg:zLy2Kerc64CiGImHc/28wzCBlycJWee7
TLSH
T19A933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 88KB
SHA256 bb6ac13115828e5558d1dd7639348136cf41e85d5cb4c53e55e6a0bd7e948c2d
MD5 109b5ff0adee155098bb527097c4adbe
SHA1 2c21c664d04e5a2b5e947132103891493854570d
SHA512 b4c47ca688fd032cb3929ec06565fee0faa3af00b055a7d4cae4869673f68ec7f37fc528c8341ed824bc12045fbbe789a6a9db27475fae9f5d18fe208f04d995
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsK:zLy2Kerc64CiGImHc/28wzCBlycJWee5
TLSH
T109933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3528-17-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/3528-18-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/4076-14-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/4236-0-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/4236-12-0x0000000000400000-0x000000000042A000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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