juko | 0217292d3ef15b303e019cfbc7c5046318d34533a9b489be69443b33634ad586

General

Target
2026-07-04_165c6c27fec795af3d1a4621d448f836_elex_wannacry.exe
Size 88KB
Sample260704-e2j11sfs7p
SHA256 0217292d3ef15b303e019cfbc7c5046318d34533a9b489be69443b33634ad586
MD5 165c6c27fec795af3d1a4621d448f836
SHA1 b522e9c8e7d47417ebd90cf3fe22b0dbaa1d0c5b
SHA512 5cca4d90fe4e93e1d25b876115501c10fdc46ad91c4dbb0048fdaf047a6006037d64c8b480d6c657cc59768bdddff13f9b14bebed8cf234dbc9e62fd26a4f3a5
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsZ:zLy2Kerc64CiGImHc/28wzCBlycJWee6
TLSH
T100933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
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/3644-0-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral1/files/0x0011000000024345-5.dat	family_juko
behavioral1/memory/3644-12-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral1/memory/3912-14-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral1/files/0x0009000000024458-15.dat	family_juko
behavioral1/memory/2788-17-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral1/memory/2788-18-0x0000000000400000-0x000000000042A000-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-1-5-21-204488895-2999877624-296153668-1000\Control Panel\International\Geo\Nation	2026-07-04_165c6c27fec795af3d1a4621d448f836_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-204488895-2999877624-296153668-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
3912	WINWORD.exe
2788	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-1-5-21-204488895-2999877624-296153668-1000\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	2026-07-04_165c6c27fec795af3d1a4621d448f836_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
1772	PING.EXE
3960	PING.EXE
4368	cmd.exe
4804	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4804	PING.EXE
1772	PING.EXE
3960	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3644 wrote to memory of 3912	3644	2026-07-04_165c6c27fec795af3d1a4621d448f836_elex_wannacry.exe	85
PID 3912 wrote to memory of 4368	3912	WINWORD.exe	86
PID 4368 wrote to memory of 4804	4368	cmd.exe	88
PID 4368 wrote to memory of 1772	4368	cmd.exe	91
PID 4368 wrote to memory of 3960	4368	cmd.exe	93
PID 4368 wrote to memory of 2788	4368	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-07-04_165c6c27fec795af3d1a4621d448f836_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-04_165c6c27fec795af3d1a4621d448f836_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3644
- 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:3912
- - 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\00003BC1" 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:4368
  - - 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:4804
  - - 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:1772
  - - 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:3960
  - - 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:2788

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

00003BC1

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003BC1
Size 88KB
SHA256 a77aacf276a37d1af90cb7d3b0a4a1f5fba3d58e84fceab1161cf6b0e022a906
MD5 6d717ce0892f07608736c9024a2af68f
SHA1 5e95847a7b7a53acee7714676ad7d437e1a2dbba
SHA512 5e65e412e85d788a1983022397ec085bc8dc9bf9891baeeee6cd20e5574c9f10cf66144c89a43f707de38e58d0b95459c0be9992fb9c50deebca5a92907cd440
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsx:zLy2Kerc64CiGImHc/28wzCBlycJWeeW
TLSH
T17D933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 88KB
SHA256 0217292d3ef15b303e019cfbc7c5046318d34533a9b489be69443b33634ad586
MD5 165c6c27fec795af3d1a4621d448f836
SHA1 b522e9c8e7d47417ebd90cf3fe22b0dbaa1d0c5b
SHA512 5cca4d90fe4e93e1d25b876115501c10fdc46ad91c4dbb0048fdaf047a6006037d64c8b480d6c657cc59768bdddff13f9b14bebed8cf234dbc9e62fd26a4f3a5
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsZ:zLy2Kerc64CiGImHc/28wzCBlycJWee6
TLSH
T100933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2788-17-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/2788-18-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/3644-0-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/3644-12-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/3912-14-0x0000000000400000-0x000000000042A000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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