juko | a859ee99b50ac7e5bd51e69389eba5c30bbc3b586ea761fa2ee208b0544fbf2f

General

Target
2026-05-31_69c3ad92a137040ed705a5f188b84dfc_elex_wannacry.exe
Size 95KB
Sample260531-jknp4aev4l
SHA256 a859ee99b50ac7e5bd51e69389eba5c30bbc3b586ea761fa2ee208b0544fbf2f
MD5 69c3ad92a137040ed705a5f188b84dfc
SHA1 f475128dc67ed9ae0028141d3684865c349c9d79
SHA512 5e3cff21ca79e0ede3dd26b156a2a3c3294b923b120961e711b4f684a0434eff559f79923dc6dd127702c0f6f48e61fd7e1e24835c919d0c6fd140f9fb95cab4
SSDEEP 1536:JLsF2Kerc64sTiX2IV0DXJrdShIPoANJLlAXuSXv+qSFEAeOFNp:JLy2Kerc64CiGIm7JrshIPFJRAhP2EAd
TLSH
T18793CF167B986052D88A0470CA7F4F3584397C791426E213B3D27A1F2DB2A52EF73ADD
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
behavioral2/memory/1776-0-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/files/0x002000000002b2a8-5.dat	family_juko
behavioral2/memory/1776-11-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/memory/3460-14-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/files/0x001b00000002b462-15.dat	family_juko
behavioral2/memory/3188-17-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/memory/3188-18-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3460	WINWORD.exe
3188	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-1-5-21-2409539145-3342400454-2096821238-1000\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	2026-05-31_69c3ad92a137040ed705a5f188b84dfc_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
4536	PING.EXE
4460	cmd.exe
1744	PING.EXE
1848	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1744	PING.EXE
1848	PING.EXE
4536	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1776 wrote to memory of 3460	1776	2026-05-31_69c3ad92a137040ed705a5f188b84dfc_elex_wannacry.exe	80
PID 3460 wrote to memory of 4460	3460	WINWORD.exe	81
PID 4460 wrote to memory of 1744	4460	cmd.exe	83
PID 4460 wrote to memory of 1848	4460	cmd.exe	84
PID 4460 wrote to memory of 4536	4460	cmd.exe	85
PID 4460 wrote to memory of 3188	4460	cmd.exe	86

C:\Users\Admin\AppData\Local\Temp\2026-05-31_69c3ad92a137040ed705a5f188b84dfc_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-31_69c3ad92a137040ed705a5f188b84dfc_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1776
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3460
- - 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\00003602" 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:4460
  - - 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:1744
  - - 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:1848
  - - 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:4536
  - - 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:3188

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

Remote System Discovery

1

T1018

System Information Discovery

1

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

00003602

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003602
Size 95KB
SHA256 5e1cadaf719f2f1f770835d7414fd98a0d16983ab0bf82306971b353bf272d74
MD5 cd319d168978cc825076823d67da9b5f
SHA1 1d41c8542d05f52c29943c0f648fb449671f1a8d
SHA512 98e464b472b289a43906de04c992c2b6177452ebd9808ffca3b2667af148ff625967e9769344b8dfbd52dac990dba0f2313b7303ff3009c871218206c4fff4bd
SSDEEP 1536:JLsF2Kerc64sTiX2IV0DXJrdShIPoANJLlAXuSXv+qSFEAeOFNn:JLy2Kerc64CiGIm7JrshIPFJRAhP2EAb
TLSH
T10393CF167B986052D88A0470CA7F4F3584397C791426E213B3D27A1F2DB2A52EF73ADD
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 95KB
SHA256 a859ee99b50ac7e5bd51e69389eba5c30bbc3b586ea761fa2ee208b0544fbf2f
MD5 69c3ad92a137040ed705a5f188b84dfc
SHA1 f475128dc67ed9ae0028141d3684865c349c9d79
SHA512 5e3cff21ca79e0ede3dd26b156a2a3c3294b923b120961e711b4f684a0434eff559f79923dc6dd127702c0f6f48e61fd7e1e24835c919d0c6fd140f9fb95cab4
SSDEEP 1536:JLsF2Kerc64sTiX2IV0DXJrdShIPoANJLlAXuSXv+qSFEAeOFNp:JLy2Kerc64CiGIm7JrshIPFJRAhP2EAd
TLSH
T18793CF167B986052D88A0470CA7F4F3584397C791426E213B3D27A1F2DB2A52EF73ADD
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1776-0-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/1776-11-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/3188-17-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/3188-18-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/3460-14-0x0000000000400000-0x000000000042B000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads