juko | ffbe59fc42cef45a6c5bbb52d58f4c03e0a0a809b08840af4b84521d978e5421

General

Target
2026-08-01_d8446e349cc1bd145f8c768fbe15fc08_elex_wannacry.exe
Size 48KB
Sample260802-egeksscg33
SHA256 ffbe59fc42cef45a6c5bbb52d58f4c03e0a0a809b08840af4b84521d978e5421
MD5 d8446e349cc1bd145f8c768fbe15fc08
SHA1 3eb53f8e85a0be21f41518591f7e35b658323a6f
SHA512 a2872269ef4d5fbc8775397de698c0aa9a3fef3e468db743dc03f0801632463e3d5b0249c8b676ebf501713debdba6bdb680694b0adbb36925fa606616179ce5
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8s:bLy2Kerc64CiGImav42j0k
TLSH
T1B8234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery execution juko persistence trojan

Malware Config

Signatures

Family: Juko
Juko is a trojan written in C++.
trojan juko

Detects Juko 8 IoCs

resource	yara_rule
behavioral1/memory/4252-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x0006000000016917-5.dat	family_juko
behavioral1/memory/1496-11-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/4252-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/1496-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x00090000000242e1-16.dat	family_juko
behavioral1/memory/4452-18-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/4452-19-0x0000000000400000-0x0000000000420000-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-1-5-21-889581200-2041691093-2048517887-1000\Control Panel\International\Geo\Nation	2026-08-01_d8446e349cc1bd145f8c768fbe15fc08_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-889581200-2041691093-2048517887-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
1496	WINWORD.exe
4452	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-1-5-21-889581200-2041691093-2048517887-1000\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

Executes a command shell one-liner 1 TTPs 1 IoCs

Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

execution

Windows Command Shell

T1059.003

pid	Process
5048	cmd.exe

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	2026-08-01_d8446e349cc1bd145f8c768fbe15fc08_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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.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
1448	PING.EXE
5048	cmd.exe
4708	PING.EXE
3280	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4708	PING.EXE
3280	PING.EXE
1448	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4252 wrote to memory of 1496	4252	2026-08-01_d8446e349cc1bd145f8c768fbe15fc08_elex_wannacry.exe	83
PID 1496 wrote to memory of 5048	1496	WINWORD.exe	84
PID 5048 wrote to memory of 4708	5048	cmd.exe	86
PID 5048 wrote to memory of 3280	5048	cmd.exe	87
PID 5048 wrote to memory of 1448	5048	cmd.exe	88
PID 5048 wrote to memory of 4452	5048	cmd.exe	89

C:\Users\Admin\AppData\Local\Temp\2026-08-01_d8446e349cc1bd145f8c768fbe15fc08_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-01_d8446e349cc1bd145f8c768fbe15fc08_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4252
- 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:1496
- - 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\00007484" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - Executes a command shell one-liner
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:5048
  - - 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:4708
  - - 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:3280
  - - 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:1448
  - - 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:4452

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

Windows Command Shell

1

T1059.003

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

00007484

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007484
Size 48KB
SHA256 15ee0b71fa75bc0be2b753adc9f7e568c3993ac2f48cf5dd5474fff6e0ad3732
MD5 ac539921fb023dfef488db21692383e5
SHA1 0911ba099e01f383ce5b7d10a6402920026217f9
SHA512 e29f0eb404a3d071eda6dc27add9ceedbe1cfa023e93b5208cfc5ef4d5e0fee3cb7dd3541017ffb24a57f7dfa8c9a32582963b1061c93cb4adfc44a47863b762
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8o:bLy2Kerc64CiGImav42j0Q
TLSH
T166234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 48KB
SHA256 ffbe59fc42cef45a6c5bbb52d58f4c03e0a0a809b08840af4b84521d978e5421
MD5 d8446e349cc1bd145f8c768fbe15fc08
SHA1 3eb53f8e85a0be21f41518591f7e35b658323a6f
SHA512 a2872269ef4d5fbc8775397de698c0aa9a3fef3e468db743dc03f0801632463e3d5b0249c8b676ebf501713debdba6bdb680694b0adbb36925fa606616179ce5
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8s:bLy2Kerc64CiGImav42j0k
TLSH
T1B8234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1496-11-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/1496-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4252-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4252-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4452-18-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4452-19-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads