juko | 1295cee85523f249dbd1c4eaaeeb57abf8c46e5acd0db6a1943345712d058325

General

Target
2026-08-12_445cbac72bdc825c32750db0f381cce6_elex_wannacry.exe
Size 64KB
Sample260813-bpezrayfph
SHA256 1295cee85523f249dbd1c4eaaeeb57abf8c46e5acd0db6a1943345712d058325
MD5 445cbac72bdc825c32750db0f381cce6
SHA1 15dd3f705441edb76c0a655aaa33a9cbf164eab3
SHA512 f8969ae77be68f588aa2ccc78e5bd4cb2b3057f7dde0b58dee6ee52d1666e70594b3d129fa708a16d46277d87264d2f317bc910b0ed58cc27c45f2c9095e587f
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/us:sLy2Kerc64CiGIm8so28s
TLSH
T177535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
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 2 IoCs

resource	yara_rule
behavioral1/files/0x000300000001e696-4.dat	family_juko
behavioral1/files/0x000400000001e6d8-12.dat	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-1-5-21-668679576-120646659-2289335452-1000\Control Panel\International\Geo\Nation	2026-08-12_445cbac72bdc825c32750db0f381cce6_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-668679576-120646659-2289335452-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
2616	WINWORD.exe
2392	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-1-5-21-668679576-120646659-2289335452-1000\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
4780	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	2026-08-12_445cbac72bdc825c32750db0f381cce6_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
4780	cmd.exe
3816	PING.EXE
1656	PING.EXE
4828	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3816	PING.EXE
1656	PING.EXE
4828	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4424 wrote to memory of 2616	4424	2026-08-12_445cbac72bdc825c32750db0f381cce6_elex_wannacry.exe	86
PID 2616 wrote to memory of 4780	2616	WINWORD.exe	87
PID 4780 wrote to memory of 3816	4780	cmd.exe	89
PID 4780 wrote to memory of 1656	4780	cmd.exe	90
PID 4780 wrote to memory of 4828	4780	cmd.exe	91
PID 4780 wrote to memory of 2392	4780	cmd.exe	92

C:\Users\Admin\AppData\Local\Temp\2026-08-12_445cbac72bdc825c32750db0f381cce6_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-12_445cbac72bdc825c32750db0f381cce6_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4424
- 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:2616
- - 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\00007819" 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:4780
  - - 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:3816
  - - 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: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:4828
  - - 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:2392

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

00007819

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007819
Size 64KB
SHA256 327ef8133d439897eaa3447f57d0e0cf10a92ea15a71c866dc63c9cfbbcf1696
MD5 b57657616a8ecc821c45db82ccdb0635
SHA1 99806be2b75ff7e8ed1bd30bd462a35a7d974950
SHA512 b530a246d54bdb8846516b919445fcefe701b36267f287c2cc7725959c32adf6303e4c0c2d19313b118d0f8b16a67396e26a069f692ca181cd71fc559035d3fa
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/ur:sLy2Kerc64CiGIm8so28r
TLSH
T137535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 64KB
SHA256 1295cee85523f249dbd1c4eaaeeb57abf8c46e5acd0db6a1943345712d058325
MD5 445cbac72bdc825c32750db0f381cce6
SHA1 15dd3f705441edb76c0a655aaa33a9cbf164eab3
SHA512 f8969ae77be68f588aa2ccc78e5bd4cb2b3057f7dde0b58dee6ee52d1666e70594b3d129fa708a16d46277d87264d2f317bc910b0ed58cc27c45f2c9095e587f
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/us:sLy2Kerc64CiGIm8so28s
TLSH
T177535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads