juko | 25f2621441dd30e43c6db36b7b1ab429277d35b180e812fc92dfc71dd9667267

General

Target
2026-07-03_8c4591373598808f69e08482c27f2dbd_elex_wannacry.exe
Size 48KB
Sample260703-kpsehsd14s
SHA256 25f2621441dd30e43c6db36b7b1ab429277d35b180e812fc92dfc71dd9667267
MD5 8c4591373598808f69e08482c27f2dbd
SHA1 b6147c078ae6f92b930e7ce74e16c2beb7046036
SHA512 17956ba15096df5ed1eaee99eb52bde5ad6828533e64e78195e352a58d6d79c960e05dd954c13a74e49228ddcad002e500f895ae1a1a95e78357311b7be5eaf9
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8w:bLy2Kerc64CiGImav42j0o
TLSH
T19D234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
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/2732-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x0013000000024315-5.dat	family_juko
behavioral1/memory/2732-11-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/1548-14-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x0009000000024439-15.dat	family_juko
behavioral1/memory/4444-17-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/4444-18-0x0000000000400000-0x0000000000420000-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-1-5-21-876885714-46325919-1482798410-1000\Control Panel\International\Geo\Nation	WINWORD.exe
Key value queried	\REGISTRY\USER\S-1-5-21-876885714-46325919-1482798410-1000\Control Panel\International\Geo\Nation	2026-07-03_8c4591373598808f69e08482c27f2dbd_elex_wannacry.exe

Executes dropped EXE 2 IoCs

pid	Process
1548	WINWORD.exe
4444	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

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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-07-03_8c4591373598808f69e08482c27f2dbd_elex_wannacry.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
4356	cmd.exe
2416	PING.EXE
1948	PING.EXE
1480	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2416	PING.EXE
1948	PING.EXE
1480	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2732 wrote to memory of 1548	2732	2026-07-03_8c4591373598808f69e08482c27f2dbd_elex_wannacry.exe	87
PID 1548 wrote to memory of 4356	1548	WINWORD.exe	88
PID 4356 wrote to memory of 2416	4356	cmd.exe	90
PID 4356 wrote to memory of 1948	4356	cmd.exe	91
PID 4356 wrote to memory of 1480	4356	cmd.exe	92
PID 4356 wrote to memory of 4444	4356	cmd.exe	93

C:\Users\Admin\AppData\Local\Temp\2026-07-03_8c4591373598808f69e08482c27f2dbd_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-03_8c4591373598808f69e08482c27f2dbd_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2732
- 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:1548
- - 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\00007101" 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:4356
  - - 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:2416
  - - 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:1948
  - - 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:1480
  - - 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:4444

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

00007101

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007101
Size 48KB
SHA256 14729eea96e5eca82bf6a5408400dd00607c20cf2b2e2516a6208c140d086552
MD5 1e638dee40a113357615065665cdae33
SHA1 f81c2ecaca8b811bbcadfa119d31dd15a9323802
SHA512 1a95c2f9f3bab7db05d0630aff9492bcc3cf24b0937a039b07ef1126a7f293303bab556e40cc6165c262a70d32d0735122a57e8aedde5354be09860c40e309e4
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8w:bLy2Kerc64CiGImav42j0I
TLSH
T192234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 48KB
SHA256 25f2621441dd30e43c6db36b7b1ab429277d35b180e812fc92dfc71dd9667267
MD5 8c4591373598808f69e08482c27f2dbd
SHA1 b6147c078ae6f92b930e7ce74e16c2beb7046036
SHA512 17956ba15096df5ed1eaee99eb52bde5ad6828533e64e78195e352a58d6d79c960e05dd954c13a74e49228ddcad002e500f895ae1a1a95e78357311b7be5eaf9
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8w:bLy2Kerc64CiGImav42j0o
TLSH
T19D234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1548-14-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2732-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2732-11-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4444-17-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4444-18-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads