juko | a9d5723e710a01b8693a956d21e0e88ef1b53d4ef6b0c7b80edb5ca6b5fa0502

General

Target
2026-07-31_e0a7758e97bb3162b898636094ad76b4_elex_glassworm_wannacry.exe
Size 211KB
Sample260731-24p2daab66
SHA256 a9d5723e710a01b8693a956d21e0e88ef1b53d4ef6b0c7b80edb5ca6b5fa0502
MD5 e0a7758e97bb3162b898636094ad76b4
SHA1 489788f83fb6c08c3e4ab8b1db537753c044dfdf
SHA512 c939ea1764326380e0ef59e4ee8150f9a525fbcad90e16c901a2e6df77339476a319b090d2cb0ee26da8151c03f18275a2d8ff5f7d34bd36dc6d1976055b2a6e
SSDEEP 6144:jLy2Kwc64YIK628wzQocJje7RsUmWi5F1hLPBp6qoy:jkwcEO28wzmJje7Rsei5dhoy
TLSH
T1BD246B5AF7A220E5C55A82348ABB4731C634FC2414637B3E1780F6291DB6CA59F1AFDC
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/2168-0-0x0000000000400000-0x000000000044A000-memory.dmp	family_juko
behavioral1/files/0x000d00000002428e-5.dat	family_juko
behavioral1/memory/3812-12-0x0000000000400000-0x000000000044A000-memory.dmp	family_juko
behavioral1/memory/2168-13-0x0000000000400000-0x000000000044A000-memory.dmp	family_juko
behavioral1/memory/3812-15-0x0000000000400000-0x000000000044A000-memory.dmp	family_juko
behavioral1/files/0x000900000002459a-16.dat	family_juko
behavioral1/memory/1096-18-0x0000000000400000-0x000000000044A000-memory.dmp	family_juko
behavioral1/memory/1096-19-0x0000000000400000-0x000000000044A000-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-1-5-21-876885714-46325919-1482798410-1000\Control Panel\International\Geo\Nation	2026-07-31_e0a7758e97bb3162b898636094ad76b4_elex_glassworm_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-876885714-46325919-1482798410-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
3812	WINWORD.exe
1096	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-1-5-21-876885714-46325919-1482798410-1000\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
1656	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	2026-07-31_e0a7758e97bb3162b898636094ad76b4_elex_glassworm_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
4484	PING.EXE
2876	PING.EXE
1656	cmd.exe
4124	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4484	PING.EXE
2876	PING.EXE
4124	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2168 wrote to memory of 3812	2168	2026-07-31_e0a7758e97bb3162b898636094ad76b4_elex_glassworm_wannacry.exe	87
PID 3812 wrote to memory of 1656	3812	WINWORD.exe	88
PID 1656 wrote to memory of 4124	1656	cmd.exe	90
PID 1656 wrote to memory of 4484	1656	cmd.exe	91
PID 1656 wrote to memory of 2876	1656	cmd.exe	92
PID 1656 wrote to memory of 1096	1656	cmd.exe	93

C:\Users\Admin\AppData\Local\Temp\2026-07-31_e0a7758e97bb3162b898636094ad76b4_elex_glassworm_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-31_e0a7758e97bb3162b898636094ad76b4_elex_glassworm_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2168
- 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:3812
- - 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\00004DDA" 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:1656
  - - 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:4124
  - - 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:4484
  - - 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:2876
  - - 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:1096

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

00004DDA

Path C:\Users\Admin\AppData\Roaming\Mozilla\00004DDA
Size 211KB
SHA256 cba7f98f32251751d56373ec3e00d4b3f72132856ffea6b2755b60d613c0c86d
MD5 ba54a5c1857c2ff7d97fc8797737cac1
SHA1 caac140362988e32d2a1644bd1ac3d82f35e903f
SHA512 38e36dbd7da09a6fab1cac91cbea800eca8a898f200cd5cf81b8f994cf37155d8efeff83b639cf251d917d152bf1667e6e33a5943c157804ec4d3a034c7dfaff
SSDEEP 6144:jLy2Kwc64YIK628wzQocJje7RsUmWi5F1hLPBp6qoo:jkwcEO28wzmJje7Rsei5dhoo
TLSH
T18A246B5AF7A220E5C55A82348ABB4731C634FC2414637B3E1780F6291DB6CA59F1AFDC
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 211KB
SHA256 a9d5723e710a01b8693a956d21e0e88ef1b53d4ef6b0c7b80edb5ca6b5fa0502
MD5 e0a7758e97bb3162b898636094ad76b4
SHA1 489788f83fb6c08c3e4ab8b1db537753c044dfdf
SHA512 c939ea1764326380e0ef59e4ee8150f9a525fbcad90e16c901a2e6df77339476a319b090d2cb0ee26da8151c03f18275a2d8ff5f7d34bd36dc6d1976055b2a6e
SSDEEP 6144:jLy2Kwc64YIK628wzQocJje7RsUmWi5F1hLPBp6qoy:jkwcEO28wzmJje7Rsei5dhoy
TLSH
T1BD246B5AF7A220E5C55A82348ABB4731C634FC2414637B3E1780F6291DB6CA59F1AFDC
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1096-18-0x0000000000400000-0x000000000044A000-memory.dmp

Download

memory/1096-19-0x0000000000400000-0x000000000044A000-memory.dmp

Download

memory/2168-0-0x0000000000400000-0x000000000044A000-memory.dmp

Download

memory/2168-13-0x0000000000400000-0x000000000044A000-memory.dmp

Download

memory/3812-12-0x0000000000400000-0x000000000044A000-memory.dmp

Download

memory/3812-15-0x0000000000400000-0x000000000044A000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads