juko | a78d0b5a71e8b5c1b2cfb81ecdf50dd8f3776de646dea0a3281f49b723532bbf

General

Target
2026-08-22_1b9c6ac9c262dd07f6376feb220bd5c5_elex_wannacry.exe
Size 57KB
Sample260823-nvcsss1ths
SHA256 a78d0b5a71e8b5c1b2cfb81ecdf50dd8f3776de646dea0a3281f49b723532bbf
MD5 1b9c6ac9c262dd07f6376feb220bd5c5
SHA1 05db6f4bc6d9ed3a38e2d76c89bd9dc906e49b45
SHA512 6adb1c4c515adb9fb62a8e6366791dae6e707bc135f1da9b643cc910606a0c9cf19a7e138c6d1f48785db3356533579a6cf0ae5695f585c43d235bcc43fe1902
SSDEEP 1536:qLsF2Kerc64sTiX2IV0DYlNpyyCwlAY0VdTQm:qLy2Kerc64CiGImklNUyp8Tx
TLSH
T17F433C16B950B072D99220B06A6D6B36417A9DF10317A1D3E7407ADD68F2FD2EF306CE
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/5384-0-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral1/files/0x0006000000021bf7-5.dat	family_juko
behavioral1/memory/5384-12-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral1/memory/4760-14-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral1/files/0x00080000000246a8-15.dat	family_juko
behavioral1/memory/3828-17-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral1/memory/3828-18-0x0000000000400000-0x0000000000422000-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-1-5-21-3053180483-1881419501-3594244048-1000\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	2026-08-22_1b9c6ac9c262dd07f6376feb220bd5c5_elex_wannacry.exe

Executes dropped EXE 2 IoCs

pid	Process
4760	WINWORD.exe
3828	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

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
5428	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-22_1b9c6ac9c262dd07f6376feb220bd5c5_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
5812	PING.EXE
5428	cmd.exe
4712	PING.EXE
3812	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4712	PING.EXE
3812	PING.EXE
5812	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5384 wrote to memory of 4760	5384	2026-08-22_1b9c6ac9c262dd07f6376feb220bd5c5_elex_wannacry.exe	85
PID 4760 wrote to memory of 5428	4760	WINWORD.exe	86
PID 5428 wrote to memory of 4712	5428	cmd.exe	88
PID 5428 wrote to memory of 3812	5428	cmd.exe	91
PID 5428 wrote to memory of 5812	5428	cmd.exe	94
PID 5428 wrote to memory of 3828	5428	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-22_1b9c6ac9c262dd07f6376feb220bd5c5_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-22_1b9c6ac9c262dd07f6376feb220bd5c5_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5384
- 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:4760
- - 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\000014AF" 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:5428
  - - 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:3812
  - - 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:5812
  - - 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:3828

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

000014AF

Path C:\Users\Admin\AppData\Roaming\Mozilla\000014AF
Size 57KB
SHA256 f3b9ae69f24cd5a60f34fc2dd758a3552ec3c4f69e7682b87b1c183570a9b693
MD5 27d3a96f31a6d99a1541e04b70c46360
SHA1 8c1a122d039a79919ba05066a50755eebe274b09
SHA512 38530c59da62b4cc67f53ec77a5d86fd0c1b3c88d85ed519311e032f2674bb1fe54f30a7b45cb58c2256a81cd1a4f8770839d7134f4fea90e96ccc81ca8d2ccf
SSDEEP 1536:qLsF2Kerc64sTiX2IV0DYlNpyyCwlAY0VdTQw:qLy2Kerc64CiGImklNUyp8Tf
TLSH
T165433C16B950B072D95220B06A6D6B36417A9DF10317A1D3E7407ADD68F2FD2EF306CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 57KB
SHA256 a78d0b5a71e8b5c1b2cfb81ecdf50dd8f3776de646dea0a3281f49b723532bbf
MD5 1b9c6ac9c262dd07f6376feb220bd5c5
SHA1 05db6f4bc6d9ed3a38e2d76c89bd9dc906e49b45
SHA512 6adb1c4c515adb9fb62a8e6366791dae6e707bc135f1da9b643cc910606a0c9cf19a7e138c6d1f48785db3356533579a6cf0ae5695f585c43d235bcc43fe1902
SSDEEP 1536:qLsF2Kerc64sTiX2IV0DYlNpyyCwlAY0VdTQm:qLy2Kerc64CiGImklNUyp8Tx
TLSH
T17F433C16B950B072D99220B06A6D6B36417A9DF10317A1D3E7407ADD68F2FD2EF306CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3828-17-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/3828-18-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/4760-14-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/5384-0-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/5384-12-0x0000000000400000-0x0000000000422000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads