juko | 181818da311bd62da5a8dec05595df99ab1a50b2ec753789a40b4763e4450f8e

General

Target
2026-08-09_53175d9c5cb0d496b83aa0c9c46ba863_elex_wannacry.exe
Size 49KB
Sample260809-vcan2sbd95
SHA256 181818da311bd62da5a8dec05595df99ab1a50b2ec753789a40b4763e4450f8e
MD5 53175d9c5cb0d496b83aa0c9c46ba863
SHA1 902233fb78cb5a8f59c12e019a2ac726c752e770
SHA512 23d0ca0443d6c9aed45d7c55dba3da9fca4c70ac12951521c93e17bacbb37bbf87c512d32be1d94c903751c868deaeffe6d9024c0ea600b85d18b601f729b4c6
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2S:4Ly2Kerc64CiGImVu8p4kojWh2S
TLSH
T1F3334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
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 7 IoCs

resource	yara_rule
behavioral1/memory/4692-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x0014000000024346-5.dat	family_juko
behavioral1/memory/4692-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/4912-14-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x0009000000024509-15.dat	family_juko
behavioral1/memory/2648-17-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/2648-18-0x0000000000400000-0x0000000000420000-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-1-5-21-2937465464-4167303362-2236413517-1000\Control Panel\International\Geo\Nation	WINWORD.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2937465464-4167303362-2236413517-1000\Control Panel\International\Geo\Nation	2026-08-09_53175d9c5cb0d496b83aa0c9c46ba863_elex_wannacry.exe

Executes dropped EXE 2 IoCs

pid	Process
4912	WINWORD.exe
2648	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-1-5-21-2937465464-4167303362-2236413517-1000\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
3484	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	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	2026-08-09_53175d9c5cb0d496b83aa0c9c46ba863_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

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
2452	PING.EXE
4304	PING.EXE
3364	PING.EXE
3484	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2452	PING.EXE
4304	PING.EXE
3364	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4692 wrote to memory of 4912	4692	2026-08-09_53175d9c5cb0d496b83aa0c9c46ba863_elex_wannacry.exe	85
PID 4912 wrote to memory of 3484	4912	WINWORD.exe	86
PID 3484 wrote to memory of 2452	3484	cmd.exe	88
PID 3484 wrote to memory of 4304	3484	cmd.exe	89
PID 3484 wrote to memory of 3364	3484	cmd.exe	90
PID 3484 wrote to memory of 2648	3484	cmd.exe	91

C:\Users\Admin\AppData\Local\Temp\2026-08-09_53175d9c5cb0d496b83aa0c9c46ba863_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-09_53175d9c5cb0d496b83aa0c9c46ba863_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4692
- 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:4912
- - 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\00005214" 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:3484
  - - 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:2452
  - - 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:4304
  - - 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:3364
  - - 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:2648

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

00005214

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005214
Size 49KB
SHA256 79174349f0b89d66e11d35d047c48cd58a2f3aff95732ae7fe448a1dbccdebc2
MD5 80132c2db168d576a4923f21fea8c089
SHA1 136d53bce92bf0fb128538b146ffd8f59eb92dff
SHA512 6786e88c87a83a201b8607819336ecbaf2d114fed2516f7e29f35d9a1bf7dd5ac3e4b1ab2b31afe594372e4ad887a1b515842b702f7ae63556225201e547d5f2
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2S:4Ly2Kerc64CiGImVu8p4kojWh2S
TLSH
T1BB334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 181818da311bd62da5a8dec05595df99ab1a50b2ec753789a40b4763e4450f8e
MD5 53175d9c5cb0d496b83aa0c9c46ba863
SHA1 902233fb78cb5a8f59c12e019a2ac726c752e770
SHA512 23d0ca0443d6c9aed45d7c55dba3da9fca4c70ac12951521c93e17bacbb37bbf87c512d32be1d94c903751c868deaeffe6d9024c0ea600b85d18b601f729b4c6
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2S:4Ly2Kerc64CiGImVu8p4kojWh2S
TLSH
T1F3334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2648-17-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2648-18-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4692-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4692-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4912-14-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads