juko | ec8264df4aa258b9f989e4f42b9d58083a0e0eb96e3d57d885444e135653bdd7

General

Target
2026-07-02_3d0d0f22087fea6c7fd3cb73f870b5fd_elex_wannacry.exe
Size 64KB
Sample260702-2vtcfaf191
SHA256 ec8264df4aa258b9f989e4f42b9d58083a0e0eb96e3d57d885444e135653bdd7
MD5 3d0d0f22087fea6c7fd3cb73f870b5fd
SHA1 24f7c08d182ec626ceeca0a58cafddcfe01d3c9a
SHA512 348e34c15c5824b47034a5a2b4a0cf9fc86a0714879f6b4ad15dd06341f8032c0b6605698b456d073f8f86b331aa70c3b3966f6ba1970f5518e826e8b5dcc84b
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/up:sLy2Kerc64CiGIm8so28p
TLSH
T1E7535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
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 2 IoCs

resource	yara_rule
behavioral2/files/0x0007000000016b3c-4.dat	family_juko
behavioral2/files/0x001300000001c450-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4184	WINWORD.exe
3048	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-1-5-21-2639994890-966400312-4246138405-1000\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	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	2026-07-02_3d0d0f22087fea6c7fd3cb73f870b5fd_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

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
4308	PING.EXE
3124	cmd.exe
5384	PING.EXE
5072	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5384	PING.EXE
5072	PING.EXE
4308	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4876 wrote to memory of 4184	4876	2026-07-02_3d0d0f22087fea6c7fd3cb73f870b5fd_elex_wannacry.exe	88
PID 4184 wrote to memory of 3124	4184	WINWORD.exe	89
PID 3124 wrote to memory of 5384	3124	cmd.exe	91
PID 3124 wrote to memory of 5072	3124	cmd.exe	92
PID 3124 wrote to memory of 4308	3124	cmd.exe	93
PID 3124 wrote to memory of 3048	3124	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-07-02_3d0d0f22087fea6c7fd3cb73f870b5fd_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-02_3d0d0f22087fea6c7fd3cb73f870b5fd_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4876
- 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:4184
- - 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\00000643" 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:3124
  - - 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:5384
  - - 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:5072
  - - 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:4308
  - - 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:3048

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

00000643

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000643
Size 64KB
SHA256 058bd0695f57d89cef2662b8541206cae5f0a84f3bbd5d26bfab17e900e16a1b
MD5 f397befbce4e48f2d4dba82a8263174d
SHA1 c4431e98d890336100878b256a25e6970e5553b0
SHA512 d687353cfd3b2c9cb17c13544d0a7ac5c7d182f0ff718352685d790860c04ad7767ca1a4fe8af062f83173083c36a211b8db282f19a7fe57c8594d8a0760dec7
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/u2:sLy2Kerc64CiGIm8so282
TLSH
T1C2535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 64KB
SHA256 ec8264df4aa258b9f989e4f42b9d58083a0e0eb96e3d57d885444e135653bdd7
MD5 3d0d0f22087fea6c7fd3cb73f870b5fd
SHA1 24f7c08d182ec626ceeca0a58cafddcfe01d3c9a
SHA512 348e34c15c5824b47034a5a2b4a0cf9fc86a0714879f6b4ad15dd06341f8032c0b6605698b456d073f8f86b331aa70c3b3966f6ba1970f5518e826e8b5dcc84b
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/up:sLy2Kerc64CiGIm8so28p
TLSH
T1E7535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
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